[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * sed.c - very minimalist version of sed
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| 4 | *
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| 5 | * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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| 6 | * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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| 7 | * Copyright (C) 2002 Matt Kraai
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| 8 | * Copyright (C) 2003 by Glenn McGrath
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| 9 | * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
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| 10 | *
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| 11 | * MAINTAINER: Rob Landley <rob@landley.net>
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| 12 | *
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| 13 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 14 | */
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| 15 |
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| 16 | /* Code overview.
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| 17 |
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| 18 | Files are laid out to avoid unnecessary function declarations. So for
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| 19 | example, every function add_cmd calls occurs before add_cmd in this file.
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| 20 |
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| 21 | add_cmd() is called on each line of sed command text (from a file or from
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| 22 | the command line). It calls get_address() and parse_cmd_args(). The
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| 23 | resulting sed_cmd_t structures are appended to a linked list
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| 24 | (G.sed_cmd_head/G.sed_cmd_tail).
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| 25 |
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| 26 | add_input_file() adds a FILE* to the list of input files. We need to
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| 27 | know all input sources ahead of time to find the last line for the $ match.
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| 28 |
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| 29 | process_files() does actual sedding, reading data lines from each input FILE *
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| 30 | (which could be stdin) and applying the sed command list (sed_cmd_head) to
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| 31 | each of the resulting lines.
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| 32 |
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| 33 | sed_main() is where external code calls into this, with a command line.
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| 34 | */
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| 35 |
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| 36 |
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| 37 | /*
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| 38 | Supported features and commands in this version of sed:
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| 39 |
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| 40 | - comments ('#')
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| 41 | - address matching: num|/matchstr/[,num|/matchstr/|$]command
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| 42 | - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
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| 43 | - edit commands: (a)ppend, (i)nsert, (c)hange
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| 44 | - file commands: (r)ead
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| 45 | - backreferences in substitution expressions (\0, \1, \2...\9)
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| 46 | - grouped commands: {cmd1;cmd2}
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| 47 | - transliteration (y/source-chars/dest-chars/)
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| 48 | - pattern space hold space storing / swapping (g, h, x)
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| 49 | - labels / branching (: label, b, t, T)
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| 50 |
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| 51 | (Note: Specifying an address (range) to match is *optional*; commands
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| 52 | default to the whole pattern space if no specific address match was
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| 53 | requested.)
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| 54 |
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| 55 | Todo:
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| 56 | - Create a wrapper around regex to make libc's regex conform with sed
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| 57 |
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| 58 | Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
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| 59 | */
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| 60 |
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| 61 | #include "libbb.h"
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| 62 | #include "xregex.h"
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| 63 |
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| 64 | enum {
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| 65 | OPT_in_place = 1 << 0,
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| 66 | };
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| 67 |
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| 68 | /* Each sed command turns into one of these structures. */
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| 69 | typedef struct sed_cmd_s {
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| 70 | /* Ordered by alignment requirements: currently 36 bytes on x86 */
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| 71 | struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
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| 72 |
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| 73 | /* address storage */
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| 74 | regex_t *beg_match; /* sed -e '/match/cmd' */
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| 75 | regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
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| 76 | regex_t *sub_match; /* For 's/sub_match/string/' */
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| 77 | int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
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| 78 | int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
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| 79 |
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| 80 | FILE *sw_file; /* File (sw) command writes to, -1 for none. */
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| 81 | char *string; /* Data string for (saicytb) commands. */
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| 82 |
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| 83 | unsigned which_match; /* (s) Which match to replace (0 for all) */
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| 84 |
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| 85 | /* Bitfields (gcc won't group them if we don't) */
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| 86 | unsigned invert:1; /* the '!' after the address */
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| 87 | unsigned in_match:1; /* Next line also included in match? */
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| 88 | unsigned sub_p:1; /* (s) print option */
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| 89 |
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| 90 | char sw_last_char; /* Last line written by (sw) had no '\n' */
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| 91 |
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| 92 | /* GENERAL FIELDS */
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| 93 | char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
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| 94 | } sed_cmd_t;
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| 95 |
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| 96 | static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
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| 97 |
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| 98 | struct globals {
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| 99 | /* options */
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| 100 | int be_quiet, regex_type;
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| 101 | FILE *nonstdout;
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| 102 | char *outname, *hold_space;
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| 103 |
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| 104 | /* List of input files */
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| 105 | int input_file_count, current_input_file;
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| 106 | FILE **input_file_list;
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| 107 |
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| 108 | regmatch_t regmatch[10];
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| 109 | regex_t *previous_regex_ptr;
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| 110 |
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| 111 | /* linked list of sed commands */
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| 112 | sed_cmd_t sed_cmd_head, *sed_cmd_tail;
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| 113 |
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| 114 | /* Linked list of append lines */
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| 115 | llist_t *append_head;
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| 116 |
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| 117 | char *add_cmd_line;
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| 118 |
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| 119 | struct pipeline {
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| 120 | char *buf; /* Space to hold string */
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| 121 | int idx; /* Space used */
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| 122 | int len; /* Space allocated */
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| 123 | } pipeline;
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| 124 | } FIX_ALIASING;
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| 125 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 126 | struct BUG_G_too_big {
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| 127 | char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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| 128 | };
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| 129 | #define INIT_G() do { \
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| 130 | G.sed_cmd_tail = &G.sed_cmd_head; \
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| 131 | } while (0)
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| 132 |
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| 133 |
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| 134 | #if ENABLE_FEATURE_CLEAN_UP
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| 135 | static void sed_free_and_close_stuff(void)
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| 136 | {
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| 137 | sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
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| 138 |
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| 139 | llist_free(G.append_head, free);
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| 140 |
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| 141 | while (sed_cmd) {
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| 142 | sed_cmd_t *sed_cmd_next = sed_cmd->next;
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| 143 |
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| 144 | if (sed_cmd->sw_file)
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| 145 | xprint_and_close_file(sed_cmd->sw_file);
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| 146 |
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| 147 | if (sed_cmd->beg_match) {
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| 148 | regfree(sed_cmd->beg_match);
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| 149 | free(sed_cmd->beg_match);
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| 150 | }
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| 151 | if (sed_cmd->end_match) {
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| 152 | regfree(sed_cmd->end_match);
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| 153 | free(sed_cmd->end_match);
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| 154 | }
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| 155 | if (sed_cmd->sub_match) {
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| 156 | regfree(sed_cmd->sub_match);
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| 157 | free(sed_cmd->sub_match);
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| 158 | }
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| 159 | free(sed_cmd->string);
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| 160 | free(sed_cmd);
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| 161 | sed_cmd = sed_cmd_next;
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| 162 | }
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| 163 |
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| 164 | free(G.hold_space);
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| 165 |
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| 166 | while (G.current_input_file < G.input_file_count)
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| 167 | fclose(G.input_file_list[G.current_input_file++]);
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| 168 | }
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| 169 | #else
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| 170 | void sed_free_and_close_stuff(void);
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| 171 | #endif
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| 172 |
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| 173 | /* If something bad happens during -i operation, delete temp file */
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| 174 |
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| 175 | static void cleanup_outname(void)
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| 176 | {
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| 177 | if (G.outname) unlink(G.outname);
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| 178 | }
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| 179 |
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| 180 | /* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
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| 181 |
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| 182 | static void parse_escapes(char *dest, const char *string, int len, char from, char to)
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| 183 | {
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| 184 | int i = 0;
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| 185 |
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| 186 | while (i < len) {
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| 187 | if (string[i] == '\\') {
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| 188 | if (!to || string[i+1] == from) {
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| 189 | *dest++ = to ? to : string[i+1];
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| 190 | i += 2;
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| 191 | continue;
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| 192 | }
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| 193 | *dest++ = string[i++];
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| 194 | }
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| 195 | /* TODO: is it safe wrt a string with trailing '\\' ? */
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| 196 | *dest++ = string[i++];
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| 197 | }
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| 198 | *dest = '\0';
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| 199 | }
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| 200 |
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| 201 | static char *copy_parsing_escapes(const char *string, int len)
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| 202 | {
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| 203 | char *dest = xmalloc(len + 1);
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| 204 |
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| 205 | parse_escapes(dest, string, len, 'n', '\n');
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| 206 | /* GNU sed also recognizes \t */
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| 207 | parse_escapes(dest, dest, strlen(dest), 't', '\t');
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| 208 | return dest;
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| 209 | }
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| 210 |
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| 211 |
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| 212 | /*
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| 213 | * index_of_next_unescaped_regexp_delim - walks left to right through a string
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| 214 | * beginning at a specified index and returns the index of the next regular
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| 215 | * expression delimiter (typically a forward slash ('/')) not preceded by
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| 216 | * a backslash ('\'). A negative delimiter disables square bracket checking.
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| 217 | */
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| 218 | static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
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| 219 | {
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| 220 | int bracket = -1;
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| 221 | int escaped = 0;
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| 222 | int idx = 0;
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| 223 | char ch;
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| 224 |
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| 225 | if (delimiter < 0) {
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| 226 | bracket--;
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| 227 | delimiter = -delimiter;
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| 228 | }
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| 229 |
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| 230 | for (; (ch = str[idx]); idx++) {
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| 231 | if (bracket >= 0) {
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| 232 | if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
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| 233 | && str[idx - 1] == '^')))
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| 234 | bracket = -1;
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| 235 | } else if (escaped)
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| 236 | escaped = 0;
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| 237 | else if (ch == '\\')
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| 238 | escaped = 1;
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| 239 | else if (bracket == -1 && ch == '[')
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| 240 | bracket = idx;
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| 241 | else if (ch == delimiter)
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| 242 | return idx;
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| 243 | }
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| 244 |
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| 245 | /* if we make it to here, we've hit the end of the string */
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| 246 | bb_error_msg_and_die("unmatched '%c'", delimiter);
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| 247 | }
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| 248 |
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| 249 | /*
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| 250 | * Returns the index of the third delimiter
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| 251 | */
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| 252 | static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
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| 253 | {
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| 254 | const char *cmdstr_ptr = cmdstr;
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| 255 | char delimiter;
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| 256 | int idx = 0;
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| 257 |
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| 258 | /* verify that the 's' or 'y' is followed by something. That something
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| 259 | * (typically a 'slash') is now our regexp delimiter... */
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| 260 | if (*cmdstr == '\0')
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| 261 | bb_error_msg_and_die("bad format in substitution expression");
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| 262 | delimiter = *cmdstr_ptr++;
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| 263 |
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| 264 | /* save the match string */
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| 265 | idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
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| 266 | *match = copy_parsing_escapes(cmdstr_ptr, idx);
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| 267 |
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| 268 | /* save the replacement string */
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| 269 | cmdstr_ptr += idx + 1;
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| 270 | idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
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| 271 | *replace = copy_parsing_escapes(cmdstr_ptr, idx);
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| 272 |
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| 273 | return ((cmdstr_ptr - cmdstr) + idx);
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| 274 | }
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| 275 |
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| 276 | /*
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| 277 | * returns the index in the string just past where the address ends.
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| 278 | */
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| 279 | static int get_address(const char *my_str, int *linenum, regex_t ** regex)
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| 280 | {
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| 281 | const char *pos = my_str;
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| 282 |
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| 283 | if (isdigit(*my_str)) {
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| 284 | *linenum = strtol(my_str, (char**)&pos, 10);
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| 285 | /* endstr shouldnt ever equal NULL */
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| 286 | } else if (*my_str == '$') {
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| 287 | *linenum = -1;
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| 288 | pos++;
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| 289 | } else if (*my_str == '/' || *my_str == '\\') {
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| 290 | int next;
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| 291 | char delimiter;
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| 292 | char *temp;
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| 293 |
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| 294 | delimiter = '/';
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| 295 | if (*my_str == '\\') delimiter = *++pos;
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| 296 | next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
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| 297 | temp = copy_parsing_escapes(pos, next);
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| 298 | *regex = xmalloc(sizeof(regex_t));
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| 299 | xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
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| 300 | free(temp);
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| 301 | /* Move position to next character after last delimiter */
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| 302 | pos += (next+1);
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| 303 | }
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| 304 | return pos - my_str;
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| 305 | }
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| 306 |
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| 307 | /* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
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| 308 | static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
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| 309 | {
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| 310 | int start = 0, idx, hack = 0;
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| 311 |
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| 312 | /* Skip whitespace, then grab filename to end of line */
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| 313 | while (isspace(filecmdstr[start]))
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| 314 | start++;
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| 315 | idx = start;
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| 316 | while (filecmdstr[idx] && filecmdstr[idx] != '\n')
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| 317 | idx++;
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| 318 |
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| 319 | /* If lines glued together, put backslash back. */
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| 320 | if (filecmdstr[idx] == '\n')
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| 321 | hack = 1;
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| 322 | if (idx == start)
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| 323 | bb_error_msg_and_die("empty filename");
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| 324 | *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
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| 325 | if (hack)
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| 326 | (*retval)[idx] = '\\';
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| 327 |
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| 328 | return idx;
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| 329 | }
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| 330 |
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| 331 | static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
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| 332 | {
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| 333 | int cflags = G.regex_type;
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| 334 | char *match;
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| 335 | int idx;
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| 336 |
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| 337 | /*
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| 338 | * A substitution command should look something like this:
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| 339 | * s/match/replace/ #gIpw
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| 340 | * || | |||
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| 341 | * mandatory optional
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| 342 | */
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| 343 | idx = parse_regex_delim(substr, &match, &sed_cmd->string);
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| 344 |
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| 345 | /* determine the number of back references in the match string */
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| 346 | /* Note: we compute this here rather than in the do_subst_command()
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| 347 | * function to save processor time, at the expense of a little more memory
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| 348 | * (4 bits) per sed_cmd */
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| 349 |
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| 350 | /* process the flags */
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| 351 |
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| 352 | sed_cmd->which_match = 1;
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| 353 | while (substr[++idx]) {
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| 354 | /* Parse match number */
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| 355 | if (isdigit(substr[idx])) {
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| 356 | if (match[0] != '^') {
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| 357 | /* Match 0 treated as all, multiple matches we take the last one. */
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| 358 | const char *pos = substr + idx;
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| 359 | /* FIXME: error check? */
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| 360 | sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
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| 361 | idx = pos - substr;
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| 362 | }
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| 363 | continue;
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| 364 | }
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| 365 | /* Skip spaces */
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| 366 | if (isspace(substr[idx]))
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| 367 | continue;
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| 368 |
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| 369 | switch (substr[idx]) {
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| 370 | /* Replace all occurrences */
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| 371 | case 'g':
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| 372 | if (match[0] != '^')
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| 373 | sed_cmd->which_match = 0;
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| 374 | break;
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| 375 | /* Print pattern space */
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| 376 | case 'p':
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| 377 | sed_cmd->sub_p = 1;
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| 378 | break;
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| 379 | /* Write to file */
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| 380 | case 'w':
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| 381 | {
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| 382 | char *temp;
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| 383 | idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
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| 384 | break;
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| 385 | }
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| 386 | /* Ignore case (gnu exension) */
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| 387 | case 'I':
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| 388 | cflags |= REG_ICASE;
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| 389 | break;
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| 390 | /* Comment */
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| 391 | case '#':
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| 392 | // while (substr[++idx]) continue;
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| 393 | idx += strlen(substr + idx); // same
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| 394 | /* Fall through */
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| 395 | /* End of command */
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| 396 | case ';':
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| 397 | case '}':
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| 398 | goto out;
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| 399 | default:
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| 400 | bb_error_msg_and_die("bad option in substitution expression");
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| 401 | }
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| 402 | }
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| 403 | out:
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| 404 | /* compile the match string into a regex */
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| 405 | if (*match != '\0') {
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| 406 | /* If match is empty, we use last regex used at runtime */
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| 407 | sed_cmd->sub_match = xmalloc(sizeof(regex_t));
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| 408 | xregcomp(sed_cmd->sub_match, match, cflags);
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| 409 | }
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| 410 | free(match);
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| 411 |
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| 412 | return idx;
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| 413 | }
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| 414 |
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| 415 | /*
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| 416 | * Process the commands arguments
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| 417 | */
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| 418 | static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
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| 419 | {
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| 420 | /* handle (s)ubstitution command */
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| 421 | if (sed_cmd->cmd == 's')
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| 422 | cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
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| 423 | /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
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| 424 | else if (strchr("aic", sed_cmd->cmd)) {
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| 425 | if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
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| 426 | bb_error_msg_and_die("only a beginning address can be specified for edit commands");
|
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| 427 | for (;;) {
|
---|
| 428 | if (*cmdstr == '\n' || *cmdstr == '\\') {
|
---|
| 429 | cmdstr++;
|
---|
| 430 | break;
|
---|
| 431 | }
|
---|
| 432 | if (!isspace(*cmdstr))
|
---|
| 433 | break;
|
---|
| 434 | cmdstr++;
|
---|
| 435 | }
|
---|
| 436 | sed_cmd->string = xstrdup(cmdstr);
|
---|
| 437 | /* "\anychar" -> "anychar" */
|
---|
| 438 | parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
|
---|
| 439 | cmdstr += strlen(cmdstr);
|
---|
| 440 | /* handle file cmds: (r)ead */
|
---|
| 441 | } else if (strchr("rw", sed_cmd->cmd)) {
|
---|
| 442 | if (sed_cmd->end_line || sed_cmd->end_match)
|
---|
| 443 | bb_error_msg_and_die("command only uses one address");
|
---|
| 444 | cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
|
---|
| 445 | if (sed_cmd->cmd == 'w') {
|
---|
| 446 | sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
|
---|
| 447 | sed_cmd->sw_last_char = '\n';
|
---|
| 448 | }
|
---|
| 449 | /* handle branch commands */
|
---|
| 450 | } else if (strchr(":btT", sed_cmd->cmd)) {
|
---|
| 451 | int length;
|
---|
| 452 |
|
---|
| 453 | cmdstr = skip_whitespace(cmdstr);
|
---|
| 454 | length = strcspn(cmdstr, semicolon_whitespace);
|
---|
| 455 | if (length) {
|
---|
| 456 | sed_cmd->string = xstrndup(cmdstr, length);
|
---|
| 457 | cmdstr += length;
|
---|
| 458 | }
|
---|
| 459 | }
|
---|
| 460 | /* translation command */
|
---|
| 461 | else if (sed_cmd->cmd == 'y') {
|
---|
| 462 | char *match, *replace;
|
---|
| 463 | int i = cmdstr[0];
|
---|
| 464 |
|
---|
| 465 | cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
|
---|
| 466 | /* \n already parsed, but \delimiter needs unescaping. */
|
---|
| 467 | parse_escapes(match, match, strlen(match), i, i);
|
---|
| 468 | parse_escapes(replace, replace, strlen(replace), i, i);
|
---|
| 469 |
|
---|
| 470 | sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
|
---|
| 471 | for (i = 0; match[i] && replace[i]; i++) {
|
---|
| 472 | sed_cmd->string[i*2] = match[i];
|
---|
| 473 | sed_cmd->string[i*2+1] = replace[i];
|
---|
| 474 | }
|
---|
| 475 | free(match);
|
---|
| 476 | free(replace);
|
---|
| 477 | }
|
---|
| 478 | /* if it wasnt a single-letter command that takes no arguments
|
---|
| 479 | * then it must be an invalid command.
|
---|
| 480 | */
|
---|
| 481 | else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
|
---|
| 482 | bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
|
---|
| 483 | }
|
---|
| 484 |
|
---|
| 485 | /* give back whatever's left over */
|
---|
| 486 | return cmdstr;
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 |
|
---|
| 490 | /* Parse address+command sets, skipping comment lines. */
|
---|
| 491 |
|
---|
| 492 | static void add_cmd(const char *cmdstr)
|
---|
| 493 | {
|
---|
| 494 | sed_cmd_t *sed_cmd;
|
---|
| 495 | unsigned len, n;
|
---|
| 496 |
|
---|
| 497 | /* Append this line to any unfinished line from last time. */
|
---|
| 498 | if (G.add_cmd_line) {
|
---|
| 499 | char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
|
---|
| 500 | free(G.add_cmd_line);
|
---|
| 501 | cmdstr = G.add_cmd_line = tp;
|
---|
| 502 | }
|
---|
| 503 |
|
---|
| 504 | /* If this line ends with unescaped backslash, request next line. */
|
---|
| 505 | n = len = strlen(cmdstr);
|
---|
| 506 | while (n && cmdstr[n-1] == '\\')
|
---|
| 507 | n--;
|
---|
| 508 | if ((len - n) & 1) { /* if odd number of trailing backslashes */
|
---|
| 509 | if (!G.add_cmd_line)
|
---|
| 510 | G.add_cmd_line = xstrdup(cmdstr);
|
---|
| 511 | G.add_cmd_line[len-1] = '\0';
|
---|
| 512 | return;
|
---|
| 513 | }
|
---|
| 514 |
|
---|
| 515 | /* Loop parsing all commands in this line. */
|
---|
| 516 | while (*cmdstr) {
|
---|
| 517 | /* Skip leading whitespace and semicolons */
|
---|
| 518 | cmdstr += strspn(cmdstr, semicolon_whitespace);
|
---|
| 519 |
|
---|
| 520 | /* If no more commands, exit. */
|
---|
| 521 | if (!*cmdstr) break;
|
---|
| 522 |
|
---|
| 523 | /* if this is a comment, jump past it and keep going */
|
---|
| 524 | if (*cmdstr == '#') {
|
---|
| 525 | /* "#n" is the same as using -n on the command line */
|
---|
| 526 | if (cmdstr[1] == 'n')
|
---|
| 527 | G.be_quiet++;
|
---|
| 528 | cmdstr = strpbrk(cmdstr, "\n\r");
|
---|
| 529 | if (!cmdstr) break;
|
---|
| 530 | continue;
|
---|
| 531 | }
|
---|
| 532 |
|
---|
| 533 | /* parse the command
|
---|
| 534 | * format is: [addr][,addr][!]cmd
|
---|
| 535 | * |----||-----||-|
|
---|
| 536 | * part1 part2 part3
|
---|
| 537 | */
|
---|
| 538 |
|
---|
| 539 | sed_cmd = xzalloc(sizeof(sed_cmd_t));
|
---|
| 540 |
|
---|
| 541 | /* first part (if present) is an address: either a '$', a number or a /regex/ */
|
---|
| 542 | cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
|
---|
| 543 |
|
---|
| 544 | /* second part (if present) will begin with a comma */
|
---|
| 545 | if (*cmdstr == ',') {
|
---|
| 546 | int idx;
|
---|
| 547 |
|
---|
| 548 | cmdstr++;
|
---|
| 549 | idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
|
---|
| 550 | if (!idx)
|
---|
| 551 | bb_error_msg_and_die("no address after comma");
|
---|
| 552 | cmdstr += idx;
|
---|
| 553 | }
|
---|
| 554 |
|
---|
| 555 | /* skip whitespace before the command */
|
---|
| 556 | cmdstr = skip_whitespace(cmdstr);
|
---|
| 557 |
|
---|
| 558 | /* Check for inversion flag */
|
---|
| 559 | if (*cmdstr == '!') {
|
---|
| 560 | sed_cmd->invert = 1;
|
---|
| 561 | cmdstr++;
|
---|
| 562 |
|
---|
| 563 | /* skip whitespace before the command */
|
---|
| 564 | cmdstr = skip_whitespace(cmdstr);
|
---|
| 565 | }
|
---|
| 566 |
|
---|
| 567 | /* last part (mandatory) will be a command */
|
---|
| 568 | if (!*cmdstr)
|
---|
| 569 | bb_error_msg_and_die("missing command");
|
---|
| 570 | sed_cmd->cmd = *cmdstr++;
|
---|
| 571 | cmdstr = parse_cmd_args(sed_cmd, cmdstr);
|
---|
| 572 |
|
---|
| 573 | /* Add the command to the command array */
|
---|
| 574 | G.sed_cmd_tail->next = sed_cmd;
|
---|
| 575 | G.sed_cmd_tail = G.sed_cmd_tail->next;
|
---|
| 576 | }
|
---|
| 577 |
|
---|
| 578 | /* If we glued multiple lines together, free the memory. */
|
---|
| 579 | free(G.add_cmd_line);
|
---|
| 580 | G.add_cmd_line = NULL;
|
---|
| 581 | }
|
---|
| 582 |
|
---|
| 583 | /* Append to a string, reallocating memory as necessary. */
|
---|
| 584 |
|
---|
| 585 | #define PIPE_GROW 64
|
---|
| 586 |
|
---|
| 587 | static void pipe_putc(char c)
|
---|
| 588 | {
|
---|
| 589 | if (G.pipeline.idx == G.pipeline.len) {
|
---|
| 590 | G.pipeline.buf = xrealloc(G.pipeline.buf,
|
---|
| 591 | G.pipeline.len + PIPE_GROW);
|
---|
| 592 | G.pipeline.len += PIPE_GROW;
|
---|
| 593 | }
|
---|
| 594 | G.pipeline.buf[G.pipeline.idx++] = c;
|
---|
| 595 | }
|
---|
| 596 |
|
---|
| 597 | static void do_subst_w_backrefs(char *line, char *replace)
|
---|
| 598 | {
|
---|
| 599 | int i, j;
|
---|
| 600 |
|
---|
| 601 | /* go through the replacement string */
|
---|
| 602 | for (i = 0; replace[i]; i++) {
|
---|
| 603 | /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
|
---|
| 604 | if (replace[i] == '\\') {
|
---|
| 605 | unsigned backref = replace[++i] - '0';
|
---|
| 606 | if (backref <= 9) {
|
---|
| 607 | /* print out the text held in G.regmatch[backref] */
|
---|
| 608 | if (G.regmatch[backref].rm_so != -1) {
|
---|
| 609 | j = G.regmatch[backref].rm_so;
|
---|
| 610 | while (j < G.regmatch[backref].rm_eo)
|
---|
| 611 | pipe_putc(line[j++]);
|
---|
| 612 | }
|
---|
| 613 | continue;
|
---|
| 614 | }
|
---|
| 615 | /* I _think_ it is impossible to get '\' to be
|
---|
| 616 | * the last char in replace string. Thus we dont check
|
---|
| 617 | * for replace[i] == NUL. (counterexample anyone?) */
|
---|
| 618 | /* if we find a backslash escaped character, print the character */
|
---|
| 619 | pipe_putc(replace[i]);
|
---|
| 620 | continue;
|
---|
| 621 | }
|
---|
| 622 | /* if we find an unescaped '&' print out the whole matched text. */
|
---|
| 623 | if (replace[i] == '&') {
|
---|
| 624 | j = G.regmatch[0].rm_so;
|
---|
| 625 | while (j < G.regmatch[0].rm_eo)
|
---|
| 626 | pipe_putc(line[j++]);
|
---|
| 627 | continue;
|
---|
| 628 | }
|
---|
| 629 | /* Otherwise just output the character. */
|
---|
| 630 | pipe_putc(replace[i]);
|
---|
| 631 | }
|
---|
| 632 | }
|
---|
| 633 |
|
---|
| 634 | static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
|
---|
| 635 | {
|
---|
| 636 | char *line = *line_p;
|
---|
| 637 | int altered = 0;
|
---|
| 638 | unsigned match_count = 0;
|
---|
| 639 | regex_t *current_regex;
|
---|
| 640 |
|
---|
| 641 | current_regex = sed_cmd->sub_match;
|
---|
| 642 | /* Handle empty regex. */
|
---|
| 643 | if (!current_regex) {
|
---|
| 644 | current_regex = G.previous_regex_ptr;
|
---|
| 645 | if (!current_regex)
|
---|
| 646 | bb_error_msg_and_die("no previous regexp");
|
---|
| 647 | }
|
---|
| 648 | G.previous_regex_ptr = current_regex;
|
---|
| 649 |
|
---|
| 650 | /* Find the first match */
|
---|
| 651 | if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0))
|
---|
| 652 | return 0;
|
---|
| 653 |
|
---|
| 654 | /* Initialize temporary output buffer. */
|
---|
| 655 | G.pipeline.buf = xmalloc(PIPE_GROW);
|
---|
| 656 | G.pipeline.len = PIPE_GROW;
|
---|
| 657 | G.pipeline.idx = 0;
|
---|
| 658 |
|
---|
| 659 | /* Now loop through, substituting for matches */
|
---|
| 660 | do {
|
---|
| 661 | int i;
|
---|
| 662 |
|
---|
| 663 | /* Work around bug in glibc regexec, demonstrated by:
|
---|
| 664 | echo " a.b" | busybox sed 's [^ .]* x g'
|
---|
| 665 | The match_count check is so not to break
|
---|
| 666 | echo "hi" | busybox sed 's/^/!/g' */
|
---|
| 667 | if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
|
---|
| 668 | pipe_putc(*line++);
|
---|
| 669 | continue;
|
---|
| 670 | }
|
---|
| 671 |
|
---|
| 672 | match_count++;
|
---|
| 673 |
|
---|
| 674 | /* If we aren't interested in this match, output old line to
|
---|
| 675 | end of match and continue */
|
---|
| 676 | if (sed_cmd->which_match
|
---|
| 677 | && (sed_cmd->which_match != match_count)
|
---|
| 678 | ) {
|
---|
| 679 | for (i = 0; i < G.regmatch[0].rm_eo; i++)
|
---|
| 680 | pipe_putc(*line++);
|
---|
| 681 | continue;
|
---|
| 682 | }
|
---|
| 683 |
|
---|
| 684 | /* print everything before the match */
|
---|
| 685 | for (i = 0; i < G.regmatch[0].rm_so; i++)
|
---|
| 686 | pipe_putc(line[i]);
|
---|
| 687 |
|
---|
| 688 | /* then print the substitution string */
|
---|
| 689 | do_subst_w_backrefs(line, sed_cmd->string);
|
---|
| 690 |
|
---|
| 691 | /* advance past the match */
|
---|
| 692 | line += G.regmatch[0].rm_eo;
|
---|
| 693 | /* flag that something has changed */
|
---|
| 694 | altered++;
|
---|
| 695 |
|
---|
| 696 | /* if we're not doing this globally, get out now */
|
---|
| 697 | if (sed_cmd->which_match)
|
---|
| 698 | break;
|
---|
| 699 |
|
---|
| 700 | //maybe (G.regmatch[0].rm_eo ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
|
---|
| 701 | } while (*line && regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
|
---|
| 702 |
|
---|
| 703 | /* Copy rest of string into output pipeline */
|
---|
| 704 | while (1) {
|
---|
| 705 | char c = *line++;
|
---|
| 706 | pipe_putc(c);
|
---|
| 707 | if (c == '\0')
|
---|
| 708 | break;
|
---|
| 709 | }
|
---|
| 710 |
|
---|
| 711 | free(*line_p);
|
---|
| 712 | *line_p = G.pipeline.buf;
|
---|
| 713 | return altered;
|
---|
| 714 | }
|
---|
| 715 |
|
---|
| 716 | /* Set command pointer to point to this label. (Does not handle null label.) */
|
---|
| 717 | static sed_cmd_t *branch_to(char *label)
|
---|
| 718 | {
|
---|
| 719 | sed_cmd_t *sed_cmd;
|
---|
| 720 |
|
---|
| 721 | for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
---|
| 722 | if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
|
---|
| 723 | return sed_cmd;
|
---|
| 724 | }
|
---|
| 725 | }
|
---|
| 726 | bb_error_msg_and_die("can't find label for jump to '%s'", label);
|
---|
| 727 | }
|
---|
| 728 |
|
---|
| 729 | static void append(char *s)
|
---|
| 730 | {
|
---|
| 731 | llist_add_to_end(&G.append_head, xstrdup(s));
|
---|
| 732 | }
|
---|
| 733 |
|
---|
| 734 | static void flush_append(void)
|
---|
| 735 | {
|
---|
| 736 | char *data;
|
---|
| 737 |
|
---|
| 738 | /* Output appended lines. */
|
---|
| 739 | while ((data = (char *)llist_pop(&G.append_head))) {
|
---|
| 740 | fprintf(G.nonstdout, "%s\n", data);
|
---|
| 741 | free(data);
|
---|
| 742 | }
|
---|
| 743 | }
|
---|
| 744 |
|
---|
| 745 | static void add_input_file(FILE *file)
|
---|
| 746 | {
|
---|
| 747 | G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
|
---|
| 748 | G.input_file_list[G.input_file_count++] = file;
|
---|
| 749 | }
|
---|
| 750 |
|
---|
| 751 | /* Get next line of input from G.input_file_list, flushing append buffer and
|
---|
| 752 | * noting if we ran out of files without a newline on the last line we read.
|
---|
| 753 | */
|
---|
| 754 | enum {
|
---|
| 755 | NO_EOL_CHAR = 1,
|
---|
| 756 | LAST_IS_NUL = 2,
|
---|
| 757 | };
|
---|
| 758 | static char *get_next_line(char *gets_char)
|
---|
| 759 | {
|
---|
| 760 | char *temp = NULL;
|
---|
| 761 | int len;
|
---|
| 762 | char gc;
|
---|
| 763 |
|
---|
| 764 | flush_append();
|
---|
| 765 |
|
---|
| 766 | /* will be returned if last line in the file
|
---|
| 767 | * doesn't end with either '\n' or '\0' */
|
---|
| 768 | gc = NO_EOL_CHAR;
|
---|
| 769 | while (G.current_input_file < G.input_file_count) {
|
---|
| 770 | FILE *fp = G.input_file_list[G.current_input_file];
|
---|
| 771 | /* Read line up to a newline or NUL byte, inclusive,
|
---|
| 772 | * return malloc'ed char[]. length of the chunk read
|
---|
| 773 | * is stored in len. NULL if EOF/error */
|
---|
| 774 | temp = bb_get_chunk_from_file(fp, &len);
|
---|
| 775 | if (temp) {
|
---|
| 776 | /* len > 0 here, it's ok to do temp[len-1] */
|
---|
| 777 | char c = temp[len-1];
|
---|
| 778 | if (c == '\n' || c == '\0') {
|
---|
| 779 | temp[len-1] = '\0';
|
---|
| 780 | gc = c;
|
---|
| 781 | if (c == '\0') {
|
---|
| 782 | int ch = fgetc(fp);
|
---|
| 783 | if (ch != EOF)
|
---|
| 784 | ungetc(ch, fp);
|
---|
| 785 | else
|
---|
| 786 | gc = LAST_IS_NUL;
|
---|
| 787 | }
|
---|
| 788 | }
|
---|
| 789 | /* else we put NO_EOL_CHAR into *gets_char */
|
---|
| 790 | break;
|
---|
| 791 |
|
---|
| 792 | /* NB: I had the idea of peeking next file(s) and returning
|
---|
| 793 | * NO_EOL_CHAR only if it is the *last* non-empty
|
---|
| 794 | * input file. But there is a case where this won't work:
|
---|
| 795 | * file1: "a woo\nb woo"
|
---|
| 796 | * file2: "c no\nd no"
|
---|
| 797 | * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
|
---|
| 798 | * (note: *no* newline after "b bang"!) */
|
---|
| 799 | }
|
---|
| 800 | /* Close this file and advance to next one */
|
---|
| 801 | fclose(fp);
|
---|
| 802 | G.current_input_file++;
|
---|
| 803 | }
|
---|
| 804 | *gets_char = gc;
|
---|
| 805 | return temp;
|
---|
| 806 | }
|
---|
| 807 |
|
---|
| 808 | /* Output line of text. */
|
---|
| 809 | /* Note:
|
---|
| 810 | * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
|
---|
| 811 | * Without them, we had this:
|
---|
| 812 | * echo -n thingy >z1
|
---|
| 813 | * echo -n again >z2
|
---|
| 814 | * >znull
|
---|
| 815 | * sed "s/i/z/" z1 z2 znull | hexdump -vC
|
---|
| 816 | * output:
|
---|
| 817 | * gnu sed 4.1.5:
|
---|
| 818 | * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
|
---|
| 819 | * bbox:
|
---|
| 820 | * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
|
---|
| 821 | */
|
---|
| 822 | static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
|
---|
| 823 | {
|
---|
| 824 | char lpc = *last_puts_char;
|
---|
| 825 |
|
---|
| 826 | /* Need to insert a '\n' between two files because first file's
|
---|
| 827 | * last line wasn't terminated? */
|
---|
| 828 | if (lpc != '\n' && lpc != '\0') {
|
---|
| 829 | fputc('\n', file);
|
---|
| 830 | lpc = '\n';
|
---|
| 831 | }
|
---|
| 832 | fputs(s, file);
|
---|
| 833 |
|
---|
| 834 | /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
|
---|
| 835 | if (s[0])
|
---|
| 836 | lpc = 'x';
|
---|
| 837 |
|
---|
| 838 | /* had trailing '\0' and it was last char of file? */
|
---|
| 839 | if (last_gets_char == LAST_IS_NUL) {
|
---|
| 840 | fputc('\0', file);
|
---|
| 841 | lpc = 'x'; /* */
|
---|
| 842 | } else
|
---|
| 843 | /* had trailing '\n' or '\0'? */
|
---|
| 844 | if (last_gets_char != NO_EOL_CHAR) {
|
---|
| 845 | fputc(last_gets_char, file);
|
---|
| 846 | lpc = last_gets_char;
|
---|
| 847 | }
|
---|
| 848 |
|
---|
| 849 | if (ferror(file)) {
|
---|
| 850 | xfunc_error_retval = 4; /* It's what gnu sed exits with... */
|
---|
| 851 | bb_error_msg_and_die(bb_msg_write_error);
|
---|
| 852 | }
|
---|
| 853 | *last_puts_char = lpc;
|
---|
| 854 | }
|
---|
| 855 |
|
---|
| 856 | #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
|
---|
| 857 |
|
---|
| 858 | static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
|
---|
| 859 | {
|
---|
| 860 | int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
|
---|
| 861 | if (retval)
|
---|
| 862 | G.previous_regex_ptr = sed_cmd->beg_match;
|
---|
| 863 | return retval;
|
---|
| 864 | }
|
---|
| 865 |
|
---|
| 866 | /* Process all the lines in all the files */
|
---|
| 867 |
|
---|
| 868 | static void process_files(void)
|
---|
| 869 | {
|
---|
| 870 | char *pattern_space, *next_line;
|
---|
| 871 | int linenum = 0;
|
---|
| 872 | char last_puts_char = '\n';
|
---|
| 873 | char last_gets_char, next_gets_char;
|
---|
| 874 | sed_cmd_t *sed_cmd;
|
---|
| 875 | int substituted;
|
---|
| 876 |
|
---|
| 877 | /* Prime the pump */
|
---|
| 878 | next_line = get_next_line(&next_gets_char);
|
---|
| 879 |
|
---|
| 880 | /* Go through every line in each file */
|
---|
| 881 | again:
|
---|
| 882 | substituted = 0;
|
---|
| 883 |
|
---|
| 884 | /* Advance to next line. Stop if out of lines. */
|
---|
| 885 | pattern_space = next_line;
|
---|
| 886 | if (!pattern_space)
|
---|
| 887 | return;
|
---|
| 888 | last_gets_char = next_gets_char;
|
---|
| 889 |
|
---|
| 890 | /* Read one line in advance so we can act on the last line,
|
---|
| 891 | * the '$' address */
|
---|
| 892 | next_line = get_next_line(&next_gets_char);
|
---|
| 893 | linenum++;
|
---|
| 894 |
|
---|
| 895 | /* For every line, go through all the commands */
|
---|
| 896 | restart:
|
---|
| 897 | for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
---|
| 898 | int old_matched, matched;
|
---|
| 899 |
|
---|
| 900 | old_matched = sed_cmd->in_match;
|
---|
| 901 |
|
---|
| 902 | /* Determine if this command matches this line: */
|
---|
| 903 |
|
---|
| 904 | //bb_error_msg("match1:%d", sed_cmd->in_match);
|
---|
| 905 | //bb_error_msg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
|
---|
| 906 | // && !sed_cmd->beg_match && !sed_cmd->end_match));
|
---|
| 907 | //bb_error_msg("match3:%d", (sed_cmd->beg_line > 0
|
---|
| 908 | // && (sed_cmd->end_line || sed_cmd->end_match
|
---|
| 909 | // ? (sed_cmd->beg_line <= linenum)
|
---|
| 910 | // : (sed_cmd->beg_line == linenum)
|
---|
| 911 | // )
|
---|
| 912 | // )
|
---|
| 913 | //bb_error_msg("match4:%d", (beg_match(sed_cmd, pattern_space)));
|
---|
| 914 | //bb_error_msg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
|
---|
| 915 |
|
---|
| 916 | /* Are we continuing a previous multi-line match? */
|
---|
| 917 | sed_cmd->in_match = sed_cmd->in_match
|
---|
| 918 | /* Or is no range necessary? */
|
---|
| 919 | || (!sed_cmd->beg_line && !sed_cmd->end_line
|
---|
| 920 | && !sed_cmd->beg_match && !sed_cmd->end_match)
|
---|
| 921 | /* Or did we match the start of a numerical range? */
|
---|
| 922 | || (sed_cmd->beg_line > 0
|
---|
| 923 | && (sed_cmd->end_line || sed_cmd->end_match
|
---|
| 924 | /* note: even if end is numeric and is < linenum too,
|
---|
| 925 | * GNU sed matches! We match too */
|
---|
| 926 | ? (sed_cmd->beg_line <= linenum) /* N,end */
|
---|
| 927 | : (sed_cmd->beg_line == linenum) /* N */
|
---|
| 928 | )
|
---|
| 929 | )
|
---|
| 930 | /* Or does this line match our begin address regex? */
|
---|
| 931 | || (beg_match(sed_cmd, pattern_space))
|
---|
| 932 | /* Or did we match last line of input? */
|
---|
| 933 | || (sed_cmd->beg_line == -1 && next_line == NULL);
|
---|
| 934 |
|
---|
| 935 | /* Snapshot the value */
|
---|
| 936 | matched = sed_cmd->in_match;
|
---|
| 937 |
|
---|
| 938 | //bb_error_msg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
|
---|
| 939 | //sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
|
---|
| 940 |
|
---|
| 941 | /* Is this line the end of the current match? */
|
---|
| 942 |
|
---|
| 943 | if (matched) {
|
---|
| 944 | /* once matched, "n,xxx" range is dead, disabling it */
|
---|
| 945 | if (sed_cmd->beg_line > 0
|
---|
| 946 | && !(option_mask32 & OPT_in_place) /* but not for -i */
|
---|
| 947 | ) {
|
---|
| 948 | sed_cmd->beg_line = -2;
|
---|
| 949 | }
|
---|
| 950 | sed_cmd->in_match = !(
|
---|
| 951 | /* has the ending line come, or is this a single address command? */
|
---|
| 952 | (sed_cmd->end_line ?
|
---|
| 953 | sed_cmd->end_line == -1 ?
|
---|
| 954 | !next_line
|
---|
| 955 | : (sed_cmd->end_line <= linenum)
|
---|
| 956 | : !sed_cmd->end_match
|
---|
| 957 | )
|
---|
| 958 | /* or does this line matches our last address regex */
|
---|
| 959 | || (sed_cmd->end_match && old_matched
|
---|
| 960 | && (regexec(sed_cmd->end_match,
|
---|
| 961 | pattern_space, 0, NULL, 0) == 0))
|
---|
| 962 | );
|
---|
| 963 | }
|
---|
| 964 |
|
---|
| 965 | /* Skip blocks of commands we didn't match */
|
---|
| 966 | if (sed_cmd->cmd == '{') {
|
---|
| 967 | if (sed_cmd->invert ? matched : !matched) {
|
---|
| 968 | unsigned nest_cnt = 0;
|
---|
| 969 | while (1) {
|
---|
| 970 | if (sed_cmd->cmd == '{')
|
---|
| 971 | nest_cnt++;
|
---|
| 972 | if (sed_cmd->cmd == '}') {
|
---|
| 973 | nest_cnt--;
|
---|
| 974 | if (nest_cnt == 0)
|
---|
| 975 | break;
|
---|
| 976 | }
|
---|
| 977 | sed_cmd = sed_cmd->next;
|
---|
| 978 | if (!sed_cmd)
|
---|
| 979 | bb_error_msg_and_die("unterminated {");
|
---|
| 980 | }
|
---|
| 981 | }
|
---|
| 982 | continue;
|
---|
| 983 | }
|
---|
| 984 |
|
---|
| 985 | /* Okay, so did this line match? */
|
---|
| 986 | if (sed_cmd->invert ? matched : !matched)
|
---|
| 987 | continue; /* no */
|
---|
| 988 |
|
---|
| 989 | /* Update last used regex in case a blank substitute BRE is found */
|
---|
| 990 | if (sed_cmd->beg_match) {
|
---|
| 991 | G.previous_regex_ptr = sed_cmd->beg_match;
|
---|
| 992 | }
|
---|
| 993 |
|
---|
| 994 | /* actual sedding */
|
---|
| 995 | //bb_error_msg("pattern_space:'%s' next_line:'%s' cmd:%c",
|
---|
| 996 | //pattern_space, next_line, sed_cmd->cmd);
|
---|
| 997 | switch (sed_cmd->cmd) {
|
---|
| 998 |
|
---|
| 999 | /* Print line number */
|
---|
| 1000 | case '=':
|
---|
| 1001 | fprintf(G.nonstdout, "%d\n", linenum);
|
---|
| 1002 | break;
|
---|
| 1003 |
|
---|
| 1004 | /* Write the current pattern space up to the first newline */
|
---|
| 1005 | case 'P':
|
---|
| 1006 | {
|
---|
| 1007 | char *tmp = strchr(pattern_space, '\n');
|
---|
| 1008 | if (tmp) {
|
---|
| 1009 | *tmp = '\0';
|
---|
| 1010 | /* TODO: explain why '\n' below */
|
---|
| 1011 | sed_puts(pattern_space, '\n');
|
---|
| 1012 | *tmp = '\n';
|
---|
| 1013 | break;
|
---|
| 1014 | }
|
---|
| 1015 | /* Fall Through */
|
---|
| 1016 | }
|
---|
| 1017 |
|
---|
| 1018 | /* Write the current pattern space to output */
|
---|
| 1019 | case 'p':
|
---|
| 1020 | /* NB: we print this _before_ the last line
|
---|
| 1021 | * (of current file) is printed. Even if
|
---|
| 1022 | * that line is nonterminated, we print
|
---|
| 1023 | * '\n' here (gnu sed does the same) */
|
---|
| 1024 | sed_puts(pattern_space, '\n');
|
---|
| 1025 | break;
|
---|
| 1026 | /* Delete up through first newline */
|
---|
| 1027 | case 'D':
|
---|
| 1028 | {
|
---|
| 1029 | char *tmp = strchr(pattern_space, '\n');
|
---|
| 1030 | if (tmp) {
|
---|
| 1031 | overlapping_strcpy(pattern_space, tmp + 1);
|
---|
| 1032 | goto restart;
|
---|
| 1033 | }
|
---|
| 1034 | }
|
---|
| 1035 | /* discard this line. */
|
---|
| 1036 | case 'd':
|
---|
| 1037 | goto discard_line;
|
---|
| 1038 |
|
---|
| 1039 | /* Substitute with regex */
|
---|
| 1040 | case 's':
|
---|
| 1041 | if (!do_subst_command(sed_cmd, &pattern_space))
|
---|
| 1042 | break;
|
---|
| 1043 | substituted |= 1;
|
---|
| 1044 |
|
---|
| 1045 | /* handle p option */
|
---|
| 1046 | if (sed_cmd->sub_p)
|
---|
| 1047 | sed_puts(pattern_space, last_gets_char);
|
---|
| 1048 | /* handle w option */
|
---|
| 1049 | if (sed_cmd->sw_file)
|
---|
| 1050 | puts_maybe_newline(
|
---|
| 1051 | pattern_space, sed_cmd->sw_file,
|
---|
| 1052 | &sed_cmd->sw_last_char, last_gets_char);
|
---|
| 1053 | break;
|
---|
| 1054 |
|
---|
| 1055 | /* Append line to linked list to be printed later */
|
---|
| 1056 | case 'a':
|
---|
| 1057 | append(sed_cmd->string);
|
---|
| 1058 | break;
|
---|
| 1059 |
|
---|
| 1060 | /* Insert text before this line */
|
---|
| 1061 | case 'i':
|
---|
| 1062 | sed_puts(sed_cmd->string, '\n');
|
---|
| 1063 | break;
|
---|
| 1064 |
|
---|
| 1065 | /* Cut and paste text (replace) */
|
---|
| 1066 | case 'c':
|
---|
| 1067 | /* Only triggers on last line of a matching range. */
|
---|
| 1068 | if (!sed_cmd->in_match)
|
---|
| 1069 | sed_puts(sed_cmd->string, '\n');
|
---|
| 1070 | goto discard_line;
|
---|
| 1071 |
|
---|
| 1072 | /* Read file, append contents to output */
|
---|
| 1073 | case 'r':
|
---|
| 1074 | {
|
---|
| 1075 | FILE *rfile;
|
---|
| 1076 | rfile = fopen_for_read(sed_cmd->string);
|
---|
| 1077 | if (rfile) {
|
---|
| 1078 | char *line;
|
---|
| 1079 |
|
---|
| 1080 | while ((line = xmalloc_fgetline(rfile))
|
---|
| 1081 | != NULL)
|
---|
| 1082 | append(line);
|
---|
| 1083 | xprint_and_close_file(rfile);
|
---|
| 1084 | }
|
---|
| 1085 |
|
---|
| 1086 | break;
|
---|
| 1087 | }
|
---|
| 1088 |
|
---|
| 1089 | /* Write pattern space to file. */
|
---|
| 1090 | case 'w':
|
---|
| 1091 | puts_maybe_newline(
|
---|
| 1092 | pattern_space, sed_cmd->sw_file,
|
---|
| 1093 | &sed_cmd->sw_last_char, last_gets_char);
|
---|
| 1094 | break;
|
---|
| 1095 |
|
---|
| 1096 | /* Read next line from input */
|
---|
| 1097 | case 'n':
|
---|
| 1098 | if (!G.be_quiet)
|
---|
| 1099 | sed_puts(pattern_space, last_gets_char);
|
---|
| 1100 | if (next_line) {
|
---|
| 1101 | free(pattern_space);
|
---|
| 1102 | pattern_space = next_line;
|
---|
| 1103 | last_gets_char = next_gets_char;
|
---|
| 1104 | next_line = get_next_line(&next_gets_char);
|
---|
| 1105 | substituted = 0;
|
---|
| 1106 | linenum++;
|
---|
| 1107 | break;
|
---|
| 1108 | }
|
---|
| 1109 | /* fall through */
|
---|
| 1110 |
|
---|
| 1111 | /* Quit. End of script, end of input. */
|
---|
| 1112 | case 'q':
|
---|
| 1113 | /* Exit the outer while loop */
|
---|
| 1114 | free(next_line);
|
---|
| 1115 | next_line = NULL;
|
---|
| 1116 | goto discard_commands;
|
---|
| 1117 |
|
---|
| 1118 | /* Append the next line to the current line */
|
---|
| 1119 | case 'N':
|
---|
| 1120 | {
|
---|
| 1121 | int len;
|
---|
| 1122 | /* If no next line, jump to end of script and exit. */
|
---|
| 1123 | /* http://www.gnu.org/software/sed/manual/sed.html:
|
---|
| 1124 | * "Most versions of sed exit without printing anything
|
---|
| 1125 | * when the N command is issued on the last line of
|
---|
| 1126 | * a file. GNU sed prints pattern space before exiting
|
---|
| 1127 | * unless of course the -n command switch has been
|
---|
| 1128 | * specified. This choice is by design."
|
---|
| 1129 | */
|
---|
| 1130 | if (next_line == NULL) {
|
---|
| 1131 | //goto discard_line;
|
---|
| 1132 | goto discard_commands; /* GNU behavior */
|
---|
| 1133 | }
|
---|
| 1134 | /* Append next_line, read new next_line. */
|
---|
| 1135 | len = strlen(pattern_space);
|
---|
| 1136 | pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
|
---|
| 1137 | pattern_space[len] = '\n';
|
---|
| 1138 | strcpy(pattern_space + len+1, next_line);
|
---|
| 1139 | last_gets_char = next_gets_char;
|
---|
| 1140 | next_line = get_next_line(&next_gets_char);
|
---|
| 1141 | linenum++;
|
---|
| 1142 | break;
|
---|
| 1143 | }
|
---|
| 1144 |
|
---|
| 1145 | /* Test/branch if substitution occurred */
|
---|
| 1146 | case 't':
|
---|
| 1147 | if (!substituted) break;
|
---|
| 1148 | substituted = 0;
|
---|
| 1149 | /* Fall through */
|
---|
| 1150 | /* Test/branch if substitution didn't occur */
|
---|
| 1151 | case 'T':
|
---|
| 1152 | if (substituted) break;
|
---|
| 1153 | /* Fall through */
|
---|
| 1154 | /* Branch to label */
|
---|
| 1155 | case 'b':
|
---|
| 1156 | if (!sed_cmd->string) goto discard_commands;
|
---|
| 1157 | else sed_cmd = branch_to(sed_cmd->string);
|
---|
| 1158 | break;
|
---|
| 1159 | /* Transliterate characters */
|
---|
| 1160 | case 'y':
|
---|
| 1161 | {
|
---|
| 1162 | int i, j;
|
---|
| 1163 | for (i = 0; pattern_space[i]; i++) {
|
---|
| 1164 | for (j = 0; sed_cmd->string[j]; j += 2) {
|
---|
| 1165 | if (pattern_space[i] == sed_cmd->string[j]) {
|
---|
| 1166 | pattern_space[i] = sed_cmd->string[j + 1];
|
---|
| 1167 | break;
|
---|
| 1168 | }
|
---|
| 1169 | }
|
---|
| 1170 | }
|
---|
| 1171 |
|
---|
| 1172 | break;
|
---|
| 1173 | }
|
---|
| 1174 | case 'g': /* Replace pattern space with hold space */
|
---|
| 1175 | free(pattern_space);
|
---|
| 1176 | pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
|
---|
| 1177 | break;
|
---|
| 1178 | case 'G': /* Append newline and hold space to pattern space */
|
---|
| 1179 | {
|
---|
| 1180 | int pattern_space_size = 2;
|
---|
| 1181 | int hold_space_size = 0;
|
---|
| 1182 |
|
---|
| 1183 | if (pattern_space)
|
---|
| 1184 | pattern_space_size += strlen(pattern_space);
|
---|
| 1185 | if (G.hold_space)
|
---|
| 1186 | hold_space_size = strlen(G.hold_space);
|
---|
| 1187 | pattern_space = xrealloc(pattern_space,
|
---|
| 1188 | pattern_space_size + hold_space_size);
|
---|
| 1189 | if (pattern_space_size == 2)
|
---|
| 1190 | pattern_space[0] = 0;
|
---|
| 1191 | strcat(pattern_space, "\n");
|
---|
| 1192 | if (G.hold_space)
|
---|
| 1193 | strcat(pattern_space, G.hold_space);
|
---|
| 1194 | last_gets_char = '\n';
|
---|
| 1195 |
|
---|
| 1196 | break;
|
---|
| 1197 | }
|
---|
| 1198 | case 'h': /* Replace hold space with pattern space */
|
---|
| 1199 | free(G.hold_space);
|
---|
| 1200 | G.hold_space = xstrdup(pattern_space);
|
---|
| 1201 | break;
|
---|
| 1202 | case 'H': /* Append newline and pattern space to hold space */
|
---|
| 1203 | {
|
---|
| 1204 | int hold_space_size = 2;
|
---|
| 1205 | int pattern_space_size = 0;
|
---|
| 1206 |
|
---|
| 1207 | if (G.hold_space)
|
---|
| 1208 | hold_space_size += strlen(G.hold_space);
|
---|
| 1209 | if (pattern_space)
|
---|
| 1210 | pattern_space_size = strlen(pattern_space);
|
---|
| 1211 | G.hold_space = xrealloc(G.hold_space,
|
---|
| 1212 | hold_space_size + pattern_space_size);
|
---|
| 1213 |
|
---|
| 1214 | if (hold_space_size == 2)
|
---|
| 1215 | *G.hold_space = 0;
|
---|
| 1216 | strcat(G.hold_space, "\n");
|
---|
| 1217 | if (pattern_space)
|
---|
| 1218 | strcat(G.hold_space, pattern_space);
|
---|
| 1219 |
|
---|
| 1220 | break;
|
---|
| 1221 | }
|
---|
| 1222 | case 'x': /* Exchange hold and pattern space */
|
---|
| 1223 | {
|
---|
| 1224 | char *tmp = pattern_space;
|
---|
| 1225 | pattern_space = G.hold_space ? G.hold_space : xzalloc(1);
|
---|
| 1226 | last_gets_char = '\n';
|
---|
| 1227 | G.hold_space = tmp;
|
---|
| 1228 | break;
|
---|
| 1229 | }
|
---|
| 1230 | } /* switch */
|
---|
| 1231 | } /* for each cmd */
|
---|
| 1232 |
|
---|
| 1233 | /*
|
---|
| 1234 | * Exit point from sedding...
|
---|
| 1235 | */
|
---|
| 1236 | discard_commands:
|
---|
| 1237 | /* we will print the line unless we were told to be quiet ('-n')
|
---|
| 1238 | or if the line was suppressed (ala 'd'elete) */
|
---|
| 1239 | if (!G.be_quiet)
|
---|
| 1240 | sed_puts(pattern_space, last_gets_char);
|
---|
| 1241 |
|
---|
| 1242 | /* Delete and such jump here. */
|
---|
| 1243 | discard_line:
|
---|
| 1244 | flush_append();
|
---|
| 1245 | free(pattern_space);
|
---|
| 1246 |
|
---|
| 1247 | goto again;
|
---|
| 1248 | }
|
---|
| 1249 |
|
---|
| 1250 | /* It is possible to have a command line argument with embedded
|
---|
| 1251 | * newlines. This counts as multiple command lines.
|
---|
| 1252 | * However, newline can be escaped: 's/e/z\<newline>z/'
|
---|
| 1253 | * We check for this.
|
---|
| 1254 | */
|
---|
| 1255 |
|
---|
| 1256 | static void add_cmd_block(char *cmdstr)
|
---|
| 1257 | {
|
---|
| 1258 | char *sv, *eol;
|
---|
| 1259 |
|
---|
| 1260 | cmdstr = sv = xstrdup(cmdstr);
|
---|
| 1261 | do {
|
---|
| 1262 | eol = strchr(cmdstr, '\n');
|
---|
| 1263 | next:
|
---|
| 1264 | if (eol) {
|
---|
| 1265 | /* Count preceding slashes */
|
---|
| 1266 | int slashes = 0;
|
---|
| 1267 | char *sl = eol;
|
---|
| 1268 |
|
---|
| 1269 | while (sl != cmdstr && *--sl == '\\')
|
---|
| 1270 | slashes++;
|
---|
| 1271 | /* Odd number of preceding slashes - newline is escaped */
|
---|
| 1272 | if (slashes & 1) {
|
---|
| 1273 | overlapping_strcpy(eol - 1, eol);
|
---|
| 1274 | eol = strchr(eol, '\n');
|
---|
| 1275 | goto next;
|
---|
| 1276 | }
|
---|
| 1277 | *eol = '\0';
|
---|
| 1278 | }
|
---|
| 1279 | add_cmd(cmdstr);
|
---|
| 1280 | cmdstr = eol + 1;
|
---|
| 1281 | } while (eol);
|
---|
| 1282 | free(sv);
|
---|
| 1283 | }
|
---|
| 1284 |
|
---|
| 1285 | int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1286 | int sed_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 1287 | {
|
---|
| 1288 | unsigned opt;
|
---|
| 1289 | llist_t *opt_e, *opt_f;
|
---|
| 1290 | int status = EXIT_SUCCESS;
|
---|
| 1291 |
|
---|
| 1292 | INIT_G();
|
---|
| 1293 |
|
---|
| 1294 | /* destroy command strings on exit */
|
---|
| 1295 | if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
|
---|
| 1296 |
|
---|
| 1297 | /* Lie to autoconf when it starts asking stupid questions. */
|
---|
| 1298 | if (argv[1] && !strcmp(argv[1], "--version")) {
|
---|
| 1299 | puts("This is not GNU sed version 4.0");
|
---|
| 1300 | return 0;
|
---|
| 1301 | }
|
---|
| 1302 |
|
---|
| 1303 | /* do normal option parsing */
|
---|
| 1304 | opt_e = opt_f = NULL;
|
---|
| 1305 | opt_complementary = "e::f::" /* can occur multiple times */
|
---|
| 1306 | "nn"; /* count -n */
|
---|
| 1307 | /* -i must be first, to match OPT_in_place definition */
|
---|
| 1308 | opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
|
---|
| 1309 | &G.be_quiet); /* counter for -n */
|
---|
| 1310 | //argc -= optind;
|
---|
| 1311 | argv += optind;
|
---|
| 1312 | if (opt & OPT_in_place) { // -i
|
---|
| 1313 | atexit(cleanup_outname);
|
---|
| 1314 | }
|
---|
| 1315 | if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
|
---|
| 1316 | //if (opt & 0x4) G.be_quiet++; // -n
|
---|
| 1317 | while (opt_e) { // -e
|
---|
| 1318 | add_cmd_block(llist_pop(&opt_e));
|
---|
| 1319 | }
|
---|
| 1320 | while (opt_f) { // -f
|
---|
| 1321 | char *line;
|
---|
| 1322 | FILE *cmdfile;
|
---|
| 1323 | cmdfile = xfopen_for_read(llist_pop(&opt_f));
|
---|
| 1324 | while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
|
---|
| 1325 | add_cmd(line);
|
---|
| 1326 | free(line);
|
---|
| 1327 | }
|
---|
| 1328 | fclose(cmdfile);
|
---|
| 1329 | }
|
---|
| 1330 | /* if we didn't get a pattern from -e or -f, use argv[0] */
|
---|
| 1331 | if (!(opt & 0x18)) {
|
---|
| 1332 | if (!*argv)
|
---|
| 1333 | bb_show_usage();
|
---|
| 1334 | add_cmd_block(*argv++);
|
---|
| 1335 | }
|
---|
| 1336 | /* Flush any unfinished commands. */
|
---|
| 1337 | add_cmd("");
|
---|
| 1338 |
|
---|
| 1339 | /* By default, we write to stdout */
|
---|
| 1340 | G.nonstdout = stdout;
|
---|
| 1341 |
|
---|
| 1342 | /* argv[0..(argc-1)] should be names of file to process. If no
|
---|
| 1343 | * files were specified or '-' was specified, take input from stdin.
|
---|
| 1344 | * Otherwise, we process all the files specified. */
|
---|
| 1345 | if (argv[0] == NULL) {
|
---|
| 1346 | if (opt & OPT_in_place)
|
---|
| 1347 | bb_error_msg_and_die(bb_msg_requires_arg, "-i");
|
---|
| 1348 | add_input_file(stdin);
|
---|
| 1349 | } else {
|
---|
| 1350 | int i;
|
---|
| 1351 | FILE *file;
|
---|
| 1352 |
|
---|
| 1353 | for (i = 0; argv[i]; i++) {
|
---|
| 1354 | struct stat statbuf;
|
---|
| 1355 | int nonstdoutfd;
|
---|
| 1356 |
|
---|
| 1357 | if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
|
---|
| 1358 | add_input_file(stdin);
|
---|
| 1359 | process_files();
|
---|
| 1360 | continue;
|
---|
| 1361 | }
|
---|
| 1362 | file = fopen_or_warn(argv[i], "r");
|
---|
| 1363 | if (!file) {
|
---|
| 1364 | status = EXIT_FAILURE;
|
---|
| 1365 | continue;
|
---|
| 1366 | }
|
---|
| 1367 | if (!(opt & OPT_in_place)) {
|
---|
| 1368 | add_input_file(file);
|
---|
| 1369 | continue;
|
---|
| 1370 | }
|
---|
| 1371 |
|
---|
| 1372 | G.outname = xasprintf("%sXXXXXX", argv[i]);
|
---|
| 1373 | nonstdoutfd = xmkstemp(G.outname);
|
---|
| 1374 | G.nonstdout = xfdopen_for_write(nonstdoutfd);
|
---|
| 1375 |
|
---|
| 1376 | /* Set permissions/owner of output file */
|
---|
| 1377 | fstat(fileno(file), &statbuf);
|
---|
| 1378 | /* chmod'ing AFTER chown would preserve suid/sgid bits,
|
---|
| 1379 | * but GNU sed 4.2.1 does not preserve them either */
|
---|
| 1380 | fchmod(nonstdoutfd, statbuf.st_mode);
|
---|
| 1381 | fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
|
---|
| 1382 | add_input_file(file);
|
---|
| 1383 | process_files();
|
---|
| 1384 | fclose(G.nonstdout);
|
---|
| 1385 |
|
---|
| 1386 | G.nonstdout = stdout;
|
---|
| 1387 | /* unlink(argv[i]); */
|
---|
| 1388 | xrename(G.outname, argv[i]);
|
---|
| 1389 | free(G.outname);
|
---|
| 1390 | G.outname = NULL;
|
---|
| 1391 | }
|
---|
| 1392 | /* Here, to handle "sed 'cmds' nonexistent_file" case we did:
|
---|
| 1393 | * if (G.current_input_file >= G.input_file_count)
|
---|
| 1394 | * return status;
|
---|
| 1395 | * but it's not needed since process_files() works correctly
|
---|
| 1396 | * in this case too. */
|
---|
| 1397 | }
|
---|
| 1398 | process_files();
|
---|
| 1399 |
|
---|
| 1400 | return status;
|
---|
| 1401 | }
|
---|