[821] | 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 <bug1@iinet.net.au>
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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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[1765] | 13 | * Licensed under GPL version 2, see file LICENSE in this tarball for details.
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[821] | 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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[1765] | 24 | (G.sed_cmd_head/G.sed_cmd_tail).
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[821] | 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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[1765] | 61 | #include "libbb.h"
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[821] | 62 | #include "xregex.h"
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| 63 |
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| 64 | /* Each sed command turns into one of these structures. */
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| 65 | typedef struct sed_cmd_s {
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[1765] | 66 | /* Ordered by alignment requirements: currently 36 bytes on x86 */
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| 67 | struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
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[821] | 68 |
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[1765] | 69 | /* address storage */
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| 70 | regex_t *beg_match; /* sed -e '/match/cmd' */
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| 71 | regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
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| 72 | regex_t *sub_match; /* For 's/sub_match/string/' */
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| 73 | int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
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| 74 | int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
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[821] | 75 |
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[1765] | 76 | FILE *sw_file; /* File (sw) command writes to, -1 for none. */
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| 77 | char *string; /* Data string for (saicytb) commands. */
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[821] | 78 |
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[1765] | 79 | unsigned short which_match; /* (s) Which match to replace (0 for all) */
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[821] | 80 |
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[1765] | 81 | /* Bitfields (gcc won't group them if we don't) */
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| 82 | unsigned invert:1; /* the '!' after the address */
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| 83 | unsigned in_match:1; /* Next line also included in match? */
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| 84 | unsigned sub_p:1; /* (s) print option */
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[821] | 85 |
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[1765] | 86 | char sw_last_char; /* Last line written by (sw) had no '\n' */
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| 87 |
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| 88 | /* GENERAL FIELDS */
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| 89 | char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
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[821] | 90 | } sed_cmd_t;
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| 91 |
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[1765] | 92 | static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
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[821] | 93 |
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[1765] | 94 | struct globals {
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[821] | 95 | /* options */
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[1765] | 96 | int be_quiet, regex_type;
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[821] | 97 | FILE *nonstdout;
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| 98 | char *outname, *hold_space;
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| 99 |
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| 100 | /* List of input files */
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[1765] | 101 | int input_file_count, current_input_file;
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[821] | 102 | FILE **input_file_list;
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| 103 |
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| 104 | regmatch_t regmatch[10];
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| 105 | regex_t *previous_regex_ptr;
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[1765] | 106 |
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[821] | 107 | /* linked list of sed commands */
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| 108 | sed_cmd_t sed_cmd_head, *sed_cmd_tail;
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| 109 |
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| 110 | /* Linked list of append lines */
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| 111 | llist_t *append_head;
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| 112 |
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| 113 | char *add_cmd_line;
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| 114 |
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| 115 | struct pipeline {
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| 116 | char *buf; /* Space to hold string */
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| 117 | int idx; /* Space used */
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| 118 | int len; /* Space allocated */
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| 119 | } pipeline;
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[1765] | 120 | };
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| 121 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 122 | void BUG_sed_globals_too_big(void);
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| 123 | #define INIT_G() do { \
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| 124 | if (sizeof(struct globals) > COMMON_BUFSIZE) \
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| 125 | BUG_sed_globals_too_big(); \
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| 126 | G.sed_cmd_tail = &G.sed_cmd_head; \
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| 127 | } while (0)
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[821] | 128 |
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| 129 |
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| 130 | #if ENABLE_FEATURE_CLEAN_UP
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[1765] | 131 | static void sed_free_and_close_stuff(void)
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[821] | 132 | {
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[1765] | 133 | sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
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[821] | 134 |
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[1765] | 135 | llist_free(G.append_head, free);
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[821] | 136 |
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| 137 | while (sed_cmd) {
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| 138 | sed_cmd_t *sed_cmd_next = sed_cmd->next;
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| 139 |
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[1765] | 140 | if (sed_cmd->sw_file)
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| 141 | xprint_and_close_file(sed_cmd->sw_file);
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[821] | 142 |
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| 143 | if (sed_cmd->beg_match) {
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| 144 | regfree(sed_cmd->beg_match);
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| 145 | free(sed_cmd->beg_match);
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| 146 | }
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| 147 | if (sed_cmd->end_match) {
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| 148 | regfree(sed_cmd->end_match);
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| 149 | free(sed_cmd->end_match);
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| 150 | }
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| 151 | if (sed_cmd->sub_match) {
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| 152 | regfree(sed_cmd->sub_match);
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| 153 | free(sed_cmd->sub_match);
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| 154 | }
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| 155 | free(sed_cmd->string);
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| 156 | free(sed_cmd);
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| 157 | sed_cmd = sed_cmd_next;
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| 158 | }
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| 159 |
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[1765] | 160 | if (G.hold_space) free(G.hold_space);
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[821] | 161 |
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[1765] | 162 | while (G.current_input_file < G.input_file_count)
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| 163 | fclose(G.input_file_list[G.current_input_file++]);
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[821] | 164 | }
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[1765] | 165 | #else
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| 166 | void sed_free_and_close_stuff(void);
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[821] | 167 | #endif
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| 168 |
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| 169 | /* If something bad happens during -i operation, delete temp file */
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| 170 |
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| 171 | static void cleanup_outname(void)
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| 172 | {
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[1765] | 173 | if (G.outname) unlink(G.outname);
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[821] | 174 | }
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| 175 |
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| 176 | /* strdup, replacing "\n" with '\n', and "\delimiter" with 'delimiter' */
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| 177 |
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[1765] | 178 | static void parse_escapes(char *dest, const char *string, int len, char from, char to)
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[821] | 179 | {
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[1765] | 180 | int i = 0;
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[821] | 181 |
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[1765] | 182 | while (i < len) {
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| 183 | if (string[i] == '\\') {
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| 184 | if (!to || string[i+1] == from) {
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| 185 | *dest++ = to ? to : string[i+1];
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| 186 | i += 2;
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[821] | 187 | continue;
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[1765] | 188 | }
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| 189 | *dest++ = string[i++];
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[821] | 190 | }
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[1765] | 191 | *dest++ = string[i++];
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[821] | 192 | }
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[1765] | 193 | *dest = 0;
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[821] | 194 | }
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| 195 |
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[1765] | 196 | static char *copy_parsing_escapes(const char *string, int len)
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[821] | 197 | {
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[1765] | 198 | char *dest = xmalloc(len + 1);
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[821] | 199 |
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[1765] | 200 | parse_escapes(dest, string, len, 'n', '\n');
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[821] | 201 | return dest;
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| 202 | }
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| 203 |
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| 204 |
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| 205 | /*
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| 206 | * index_of_next_unescaped_regexp_delim - walks left to right through a string
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| 207 | * beginning at a specified index and returns the index of the next regular
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| 208 | * expression delimiter (typically a forward * slash ('/')) not preceded by
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[902] | 209 | * a backslash ('\'). A negative delimiter disables square bracket checking.
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[821] | 210 | */
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[1765] | 211 | static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
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[821] | 212 | {
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| 213 | int bracket = -1;
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| 214 | int escaped = 0;
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| 215 | int idx = 0;
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| 216 | char ch;
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| 217 |
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[902] | 218 | if (delimiter < 0) {
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| 219 | bracket--;
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[1765] | 220 | delimiter = -delimiter;
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[902] | 221 | }
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| 222 |
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[821] | 223 | for (; (ch = str[idx]); idx++) {
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[902] | 224 | if (bracket >= 0) {
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[821] | 225 | if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
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| 226 | && str[idx - 1] == '^')))
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| 227 | bracket = -1;
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| 228 | } else if (escaped)
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| 229 | escaped = 0;
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| 230 | else if (ch == '\\')
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| 231 | escaped = 1;
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[902] | 232 | else if (bracket == -1 && ch == '[')
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[821] | 233 | bracket = idx;
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| 234 | else if (ch == delimiter)
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| 235 | return idx;
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| 236 | }
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| 237 |
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| 238 | /* if we make it to here, we've hit the end of the string */
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[1765] | 239 | bb_error_msg_and_die("unmatched '%c'", delimiter);
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[821] | 240 | }
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| 241 |
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| 242 | /*
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| 243 | * Returns the index of the third delimiter
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| 244 | */
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[1765] | 245 | static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
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[821] | 246 | {
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[1765] | 247 | const char *cmdstr_ptr = cmdstr;
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[821] | 248 | char delimiter;
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| 249 | int idx = 0;
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| 250 |
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| 251 | /* verify that the 's' or 'y' is followed by something. That something
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| 252 | * (typically a 'slash') is now our regexp delimiter... */
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[902] | 253 | if (*cmdstr == '\0')
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| 254 | bb_error_msg_and_die("bad format in substitution expression");
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[1765] | 255 | delimiter = *cmdstr_ptr++;
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[821] | 256 |
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| 257 | /* save the match string */
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| 258 | idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
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| 259 | *match = copy_parsing_escapes(cmdstr_ptr, idx);
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| 260 |
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| 261 | /* save the replacement string */
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| 262 | cmdstr_ptr += idx + 1;
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[902] | 263 | idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
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[821] | 264 | *replace = copy_parsing_escapes(cmdstr_ptr, idx);
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| 265 |
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| 266 | return ((cmdstr_ptr - cmdstr) + idx);
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| 267 | }
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| 268 |
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| 269 | /*
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| 270 | * returns the index in the string just past where the address ends.
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| 271 | */
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[1765] | 272 | static int get_address(const char *my_str, int *linenum, regex_t ** regex)
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[821] | 273 | {
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[1765] | 274 | const char *pos = my_str;
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[821] | 275 |
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| 276 | if (isdigit(*my_str)) {
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[1765] | 277 | *linenum = strtol(my_str, (char**)&pos, 10);
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[821] | 278 | /* endstr shouldnt ever equal NULL */
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| 279 | } else if (*my_str == '$') {
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| 280 | *linenum = -1;
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| 281 | pos++;
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| 282 | } else if (*my_str == '/' || *my_str == '\\') {
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| 283 | int next;
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| 284 | char delimiter;
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| 285 | char *temp;
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| 286 |
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[1765] | 287 | delimiter = '/';
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| 288 | if (*my_str == '\\') delimiter = *++pos;
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[821] | 289 | next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
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[1765] | 290 | temp = copy_parsing_escapes(pos, next);
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| 291 | *regex = xmalloc(sizeof(regex_t));
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| 292 | xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
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[821] | 293 | free(temp);
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| 294 | /* Move position to next character after last delimiter */
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[902] | 295 | pos += (next+1);
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[821] | 296 | }
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| 297 | return pos - my_str;
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| 298 | }
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| 299 |
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| 300 | /* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
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[1765] | 301 | static int parse_file_cmd(sed_cmd_t *sed_cmd, const char *filecmdstr, char **retval)
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[821] | 302 | {
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[1765] | 303 | int start = 0, idx, hack = 0;
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[821] | 304 |
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| 305 | /* Skip whitespace, then grab filename to end of line */
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[1765] | 306 | while (isspace(filecmdstr[start]))
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| 307 | start++;
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| 308 | idx = start;
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| 309 | while (filecmdstr[idx] && filecmdstr[idx] != '\n')
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| 310 | idx++;
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| 311 |
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[821] | 312 | /* If lines glued together, put backslash back. */
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[1765] | 313 | if (filecmdstr[idx] == '\n')
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| 314 | hack = 1;
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| 315 | if (idx == start)
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| 316 | bb_error_msg_and_die("empty filename");
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| 317 | *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
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| 318 | if (hack)
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| 319 | (*retval)[idx] = '\\';
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[821] | 320 |
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| 321 | return idx;
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| 322 | }
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| 323 |
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[1765] | 324 | static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
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[821] | 325 | {
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[1765] | 326 | int cflags = G.regex_type;
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[821] | 327 | char *match;
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[1765] | 328 | int idx;
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[821] | 329 |
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| 330 | /*
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| 331 | * A substitution command should look something like this:
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| 332 | * s/match/replace/ #gIpw
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| 333 | * || | |||
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| 334 | * mandatory optional
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| 335 | */
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| 336 | idx = parse_regex_delim(substr, &match, &sed_cmd->string);
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| 337 |
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| 338 | /* determine the number of back references in the match string */
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| 339 | /* Note: we compute this here rather than in the do_subst_command()
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| 340 | * function to save processor time, at the expense of a little more memory
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| 341 | * (4 bits) per sed_cmd */
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| 342 |
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| 343 | /* process the flags */
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| 344 |
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[1765] | 345 | sed_cmd->which_match = 1;
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[821] | 346 | while (substr[++idx]) {
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| 347 | /* Parse match number */
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[1765] | 348 | if (isdigit(substr[idx])) {
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| 349 | if (match[0] != '^') {
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[821] | 350 | /* Match 0 treated as all, multiple matches we take the last one. */
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[1765] | 351 | const char *pos = substr + idx;
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| 352 | /* FIXME: error check? */
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| 353 | sed_cmd->which_match = (unsigned short)strtol(substr+idx, (char**) &pos, 10);
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| 354 | idx = pos - substr;
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[821] | 355 | }
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| 356 | continue;
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| 357 | }
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| 358 | /* Skip spaces */
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[1765] | 359 | if (isspace(substr[idx])) continue;
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[821] | 360 |
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| 361 | switch (substr[idx]) {
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[1765] | 362 | /* Replace all occurrences */
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| 363 | case 'g':
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| 364 | if (match[0] != '^') sed_cmd->which_match = 0;
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| 365 | break;
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| 366 | /* Print pattern space */
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| 367 | case 'p':
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| 368 | sed_cmd->sub_p = 1;
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| 369 | break;
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| 370 | /* Write to file */
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| 371 | case 'w':
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| 372 | {
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| 373 | char *temp;
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| 374 | idx += parse_file_cmd(sed_cmd, substr+idx, &temp);
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| 375 | break;
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[821] | 376 | }
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[1765] | 377 | /* Ignore case (gnu exension) */
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| 378 | case 'I':
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| 379 | cflags |= REG_ICASE;
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| 380 | break;
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| 381 | /* Comment */
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| 382 | case '#':
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| 383 | while (substr[++idx]) /*skip all*/;
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| 384 | /* Fall through */
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| 385 | /* End of command */
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| 386 | case ';':
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| 387 | case '}':
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| 388 | goto out;
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| 389 | default:
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| 390 | bb_error_msg_and_die("bad option in substitution expression");
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| 391 | }
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[821] | 392 | }
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| 393 | out:
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| 394 | /* compile the match string into a regex */
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| 395 | if (*match != '\0') {
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| 396 | /* If match is empty, we use last regex used at runtime */
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[1765] | 397 | sed_cmd->sub_match = xmalloc(sizeof(regex_t));
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[821] | 398 | xregcomp(sed_cmd->sub_match, match, cflags);
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| 399 | }
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| 400 | free(match);
|
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| 401 |
|
---|
| 402 | return idx;
|
---|
| 403 | }
|
---|
| 404 |
|
---|
| 405 | /*
|
---|
| 406 | * Process the commands arguments
|
---|
| 407 | */
|
---|
[1765] | 408 | static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
|
---|
[821] | 409 | {
|
---|
| 410 | /* handle (s)ubstitution command */
|
---|
[1765] | 411 | if (sed_cmd->cmd == 's')
|
---|
| 412 | cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
|
---|
[821] | 413 | /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
|
---|
| 414 | else if (strchr("aic", sed_cmd->cmd)) {
|
---|
| 415 | if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
|
---|
| 416 | bb_error_msg_and_die
|
---|
| 417 | ("only a beginning address can be specified for edit commands");
|
---|
[1765] | 418 | for (;;) {
|
---|
| 419 | if (*cmdstr == '\n' || *cmdstr == '\\') {
|
---|
[821] | 420 | cmdstr++;
|
---|
| 421 | break;
|
---|
[1765] | 422 | } else if (isspace(*cmdstr))
|
---|
| 423 | cmdstr++;
|
---|
| 424 | else
|
---|
| 425 | break;
|
---|
[821] | 426 | }
|
---|
[1765] | 427 | sed_cmd->string = xstrdup(cmdstr);
|
---|
| 428 | parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), 0, 0);
|
---|
[821] | 429 | cmdstr += strlen(cmdstr);
|
---|
| 430 | /* handle file cmds: (r)ead */
|
---|
[1765] | 431 | } else if (strchr("rw", sed_cmd->cmd)) {
|
---|
[821] | 432 | if (sed_cmd->end_line || sed_cmd->end_match)
|
---|
[1765] | 433 | bb_error_msg_and_die("command only uses one address");
|
---|
[821] | 434 | cmdstr += parse_file_cmd(sed_cmd, cmdstr, &sed_cmd->string);
|
---|
[1765] | 435 | if (sed_cmd->cmd == 'w') {
|
---|
| 436 | sed_cmd->sw_file = xfopen(sed_cmd->string, "w");
|
---|
| 437 | sed_cmd->sw_last_char = '\n';
|
---|
| 438 | }
|
---|
[821] | 439 | /* handle branch commands */
|
---|
| 440 | } else if (strchr(":btT", sed_cmd->cmd)) {
|
---|
| 441 | int length;
|
---|
| 442 |
|
---|
[1765] | 443 | cmdstr = skip_whitespace(cmdstr);
|
---|
[821] | 444 | length = strcspn(cmdstr, semicolon_whitespace);
|
---|
| 445 | if (length) {
|
---|
[1765] | 446 | sed_cmd->string = xstrndup(cmdstr, length);
|
---|
[821] | 447 | cmdstr += length;
|
---|
| 448 | }
|
---|
| 449 | }
|
---|
| 450 | /* translation command */
|
---|
| 451 | else if (sed_cmd->cmd == 'y') {
|
---|
| 452 | char *match, *replace;
|
---|
[1765] | 453 | int i = cmdstr[0];
|
---|
[821] | 454 |
|
---|
[1765] | 455 | cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
|
---|
[821] | 456 | /* \n already parsed, but \delimiter needs unescaping. */
|
---|
[1765] | 457 | parse_escapes(match, match, strlen(match), i, i);
|
---|
| 458 | parse_escapes(replace, replace, strlen(replace), i, i);
|
---|
[821] | 459 |
|
---|
| 460 | sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
|
---|
| 461 | for (i = 0; match[i] && replace[i]; i++) {
|
---|
[1765] | 462 | sed_cmd->string[i*2] = match[i];
|
---|
| 463 | sed_cmd->string[i*2+1] = replace[i];
|
---|
[821] | 464 | }
|
---|
| 465 | free(match);
|
---|
| 466 | free(replace);
|
---|
| 467 | }
|
---|
| 468 | /* if it wasnt a single-letter command that takes no arguments
|
---|
| 469 | * then it must be an invalid command.
|
---|
| 470 | */
|
---|
| 471 | else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
|
---|
[1765] | 472 | bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
|
---|
[821] | 473 | }
|
---|
| 474 |
|
---|
| 475 | /* give back whatever's left over */
|
---|
[1765] | 476 | return cmdstr;
|
---|
[821] | 477 | }
|
---|
| 478 |
|
---|
| 479 |
|
---|
| 480 | /* Parse address+command sets, skipping comment lines. */
|
---|
| 481 |
|
---|
[1765] | 482 | static void add_cmd(const char *cmdstr)
|
---|
[821] | 483 | {
|
---|
| 484 | sed_cmd_t *sed_cmd;
|
---|
| 485 | int temp;
|
---|
| 486 |
|
---|
| 487 | /* Append this line to any unfinished line from last time. */
|
---|
[1765] | 488 | if (G.add_cmd_line) {
|
---|
| 489 | char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
|
---|
| 490 | free(G.add_cmd_line);
|
---|
| 491 | cmdstr = G.add_cmd_line = tp;
|
---|
[821] | 492 | }
|
---|
| 493 |
|
---|
| 494 | /* If this line ends with backslash, request next line. */
|
---|
[1765] | 495 | temp = strlen(cmdstr);
|
---|
| 496 | if (temp && cmdstr[--temp] == '\\') {
|
---|
| 497 | if (!G.add_cmd_line)
|
---|
| 498 | G.add_cmd_line = xstrdup(cmdstr);
|
---|
| 499 | G.add_cmd_line[temp] = '\0';
|
---|
[821] | 500 | return;
|
---|
| 501 | }
|
---|
| 502 |
|
---|
| 503 | /* Loop parsing all commands in this line. */
|
---|
[1765] | 504 | while (*cmdstr) {
|
---|
[821] | 505 | /* Skip leading whitespace and semicolons */
|
---|
| 506 | cmdstr += strspn(cmdstr, semicolon_whitespace);
|
---|
| 507 |
|
---|
| 508 | /* If no more commands, exit. */
|
---|
[1765] | 509 | if (!*cmdstr) break;
|
---|
[821] | 510 |
|
---|
| 511 | /* if this is a comment, jump past it and keep going */
|
---|
| 512 | if (*cmdstr == '#') {
|
---|
| 513 | /* "#n" is the same as using -n on the command line */
|
---|
[1765] | 514 | if (cmdstr[1] == 'n')
|
---|
| 515 | G.be_quiet++;
|
---|
| 516 | cmdstr = strpbrk(cmdstr, "\n\r");
|
---|
| 517 | if (!cmdstr) break;
|
---|
[821] | 518 | continue;
|
---|
| 519 | }
|
---|
| 520 |
|
---|
| 521 | /* parse the command
|
---|
| 522 | * format is: [addr][,addr][!]cmd
|
---|
| 523 | * |----||-----||-|
|
---|
| 524 | * part1 part2 part3
|
---|
| 525 | */
|
---|
| 526 |
|
---|
| 527 | sed_cmd = xzalloc(sizeof(sed_cmd_t));
|
---|
| 528 |
|
---|
| 529 | /* first part (if present) is an address: either a '$', a number or a /regex/ */
|
---|
| 530 | cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
|
---|
| 531 |
|
---|
| 532 | /* second part (if present) will begin with a comma */
|
---|
| 533 | if (*cmdstr == ',') {
|
---|
| 534 | int idx;
|
---|
| 535 |
|
---|
| 536 | cmdstr++;
|
---|
| 537 | idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
|
---|
[1765] | 538 | if (!idx)
|
---|
| 539 | bb_error_msg_and_die("no address after comma");
|
---|
[821] | 540 | cmdstr += idx;
|
---|
| 541 | }
|
---|
| 542 |
|
---|
| 543 | /* skip whitespace before the command */
|
---|
[1765] | 544 | cmdstr = skip_whitespace(cmdstr);
|
---|
[821] | 545 |
|
---|
| 546 | /* Check for inversion flag */
|
---|
| 547 | if (*cmdstr == '!') {
|
---|
| 548 | sed_cmd->invert = 1;
|
---|
| 549 | cmdstr++;
|
---|
| 550 |
|
---|
| 551 | /* skip whitespace before the command */
|
---|
[1765] | 552 | cmdstr = skip_whitespace(cmdstr);
|
---|
[821] | 553 | }
|
---|
| 554 |
|
---|
| 555 | /* last part (mandatory) will be a command */
|
---|
[1765] | 556 | if (!*cmdstr)
|
---|
| 557 | bb_error_msg_and_die("missing command");
|
---|
[821] | 558 | sed_cmd->cmd = *(cmdstr++);
|
---|
| 559 | cmdstr = parse_cmd_args(sed_cmd, cmdstr);
|
---|
| 560 |
|
---|
| 561 | /* Add the command to the command array */
|
---|
[1765] | 562 | G.sed_cmd_tail->next = sed_cmd;
|
---|
| 563 | G.sed_cmd_tail = G.sed_cmd_tail->next;
|
---|
[821] | 564 | }
|
---|
| 565 |
|
---|
| 566 | /* If we glued multiple lines together, free the memory. */
|
---|
[1765] | 567 | free(G.add_cmd_line);
|
---|
| 568 | G.add_cmd_line = NULL;
|
---|
[821] | 569 | }
|
---|
| 570 |
|
---|
| 571 | /* Append to a string, reallocating memory as necessary. */
|
---|
| 572 |
|
---|
| 573 | #define PIPE_GROW 64
|
---|
| 574 |
|
---|
| 575 | static void pipe_putc(char c)
|
---|
| 576 | {
|
---|
[1765] | 577 | if (G.pipeline.idx == G.pipeline.len) {
|
---|
| 578 | G.pipeline.buf = xrealloc(G.pipeline.buf,
|
---|
| 579 | G.pipeline.len + PIPE_GROW);
|
---|
| 580 | G.pipeline.len += PIPE_GROW;
|
---|
[821] | 581 | }
|
---|
[1765] | 582 | G.pipeline.buf[G.pipeline.idx++] = c;
|
---|
[821] | 583 | }
|
---|
| 584 |
|
---|
[902] | 585 | static void do_subst_w_backrefs(char *line, char *replace)
|
---|
[821] | 586 | {
|
---|
| 587 | int i,j;
|
---|
| 588 |
|
---|
| 589 | /* go through the replacement string */
|
---|
| 590 | for (i = 0; replace[i]; i++) {
|
---|
| 591 | /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
|
---|
[1765] | 592 | if (replace[i] == '\\') {
|
---|
| 593 | unsigned backref = replace[++i] - '0';
|
---|
| 594 | if (backref <= 9) {
|
---|
| 595 | /* print out the text held in G.regmatch[backref] */
|
---|
| 596 | if (G.regmatch[backref].rm_so != -1) {
|
---|
| 597 | j = G.regmatch[backref].rm_so;
|
---|
| 598 | while (j < G.regmatch[backref].rm_eo)
|
---|
| 599 | pipe_putc(line[j++]);
|
---|
| 600 | }
|
---|
| 601 | continue;
|
---|
| 602 | }
|
---|
| 603 | /* I _think_ it is impossible to get '\' to be
|
---|
| 604 | * the last char in replace string. Thus we dont check
|
---|
| 605 | * for replace[i] == NUL. (counterexample anyone?) */
|
---|
| 606 | /* if we find a backslash escaped character, print the character */
|
---|
| 607 | pipe_putc(replace[i]);
|
---|
| 608 | continue;
|
---|
[821] | 609 | }
|
---|
| 610 | /* if we find an unescaped '&' print out the whole matched text. */
|
---|
[1765] | 611 | if (replace[i] == '&') {
|
---|
| 612 | j = G.regmatch[0].rm_so;
|
---|
| 613 | while (j < G.regmatch[0].rm_eo)
|
---|
| 614 | pipe_putc(line[j++]);
|
---|
| 615 | continue;
|
---|
| 616 | }
|
---|
[821] | 617 | /* Otherwise just output the character. */
|
---|
[1765] | 618 | pipe_putc(replace[i]);
|
---|
[821] | 619 | }
|
---|
| 620 | }
|
---|
| 621 |
|
---|
| 622 | static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
|
---|
| 623 | {
|
---|
| 624 | char *oldline = *line;
|
---|
| 625 | int altered = 0;
|
---|
[1765] | 626 | int match_count = 0;
|
---|
[821] | 627 | regex_t *current_regex;
|
---|
| 628 |
|
---|
| 629 | /* Handle empty regex. */
|
---|
| 630 | if (sed_cmd->sub_match == NULL) {
|
---|
[1765] | 631 | current_regex = G.previous_regex_ptr;
|
---|
| 632 | if (!current_regex)
|
---|
| 633 | bb_error_msg_and_die("no previous regexp");
|
---|
| 634 | } else
|
---|
| 635 | G.previous_regex_ptr = current_regex = sed_cmd->sub_match;
|
---|
[821] | 636 |
|
---|
| 637 | /* Find the first match */
|
---|
[1765] | 638 | if (REG_NOMATCH == regexec(current_regex, oldline, 10, G.regmatch, 0))
|
---|
[821] | 639 | return 0;
|
---|
| 640 |
|
---|
| 641 | /* Initialize temporary output buffer. */
|
---|
[1765] | 642 | G.pipeline.buf = xmalloc(PIPE_GROW);
|
---|
| 643 | G.pipeline.len = PIPE_GROW;
|
---|
| 644 | G.pipeline.idx = 0;
|
---|
[821] | 645 |
|
---|
| 646 | /* Now loop through, substituting for matches */
|
---|
| 647 | do {
|
---|
| 648 | int i;
|
---|
| 649 |
|
---|
| 650 | /* Work around bug in glibc regexec, demonstrated by:
|
---|
| 651 | echo " a.b" | busybox sed 's [^ .]* x g'
|
---|
| 652 | The match_count check is so not to break
|
---|
| 653 | echo "hi" | busybox sed 's/^/!/g' */
|
---|
[1765] | 654 | if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
|
---|
| 655 | pipe_putc(*oldline++);
|
---|
[821] | 656 | continue;
|
---|
| 657 | }
|
---|
| 658 |
|
---|
| 659 | match_count++;
|
---|
| 660 |
|
---|
| 661 | /* If we aren't interested in this match, output old line to
|
---|
| 662 | end of match and continue */
|
---|
[1765] | 663 | if (sed_cmd->which_match && sed_cmd->which_match != match_count) {
|
---|
| 664 | for (i = 0; i < G.regmatch[0].rm_eo; i++)
|
---|
| 665 | pipe_putc(*oldline++);
|
---|
[821] | 666 | continue;
|
---|
| 667 | }
|
---|
| 668 |
|
---|
| 669 | /* print everything before the match */
|
---|
[1765] | 670 | for (i = 0; i < G.regmatch[0].rm_so; i++)
|
---|
| 671 | pipe_putc(oldline[i]);
|
---|
[821] | 672 |
|
---|
| 673 | /* then print the substitution string */
|
---|
| 674 | do_subst_w_backrefs(oldline, sed_cmd->string);
|
---|
| 675 |
|
---|
| 676 | /* advance past the match */
|
---|
[1765] | 677 | oldline += G.regmatch[0].rm_eo;
|
---|
[821] | 678 | /* flag that something has changed */
|
---|
| 679 | altered++;
|
---|
| 680 |
|
---|
| 681 | /* if we're not doing this globally, get out now */
|
---|
| 682 | if (sed_cmd->which_match) break;
|
---|
[1765] | 683 | } while (*oldline && (regexec(current_regex, oldline, 10, G.regmatch, 0) != REG_NOMATCH));
|
---|
[821] | 684 |
|
---|
| 685 | /* Copy rest of string into output pipeline */
|
---|
| 686 |
|
---|
[1765] | 687 | while (*oldline)
|
---|
| 688 | pipe_putc(*oldline++);
|
---|
[821] | 689 | pipe_putc(0);
|
---|
| 690 |
|
---|
| 691 | free(*line);
|
---|
[1765] | 692 | *line = G.pipeline.buf;
|
---|
[821] | 693 | return altered;
|
---|
| 694 | }
|
---|
| 695 |
|
---|
| 696 | /* Set command pointer to point to this label. (Does not handle null label.) */
|
---|
[902] | 697 | static sed_cmd_t *branch_to(char *label)
|
---|
[821] | 698 | {
|
---|
| 699 | sed_cmd_t *sed_cmd;
|
---|
| 700 |
|
---|
[1765] | 701 | for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
---|
| 702 | if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
|
---|
| 703 | return sed_cmd;
|
---|
[821] | 704 | }
|
---|
| 705 | }
|
---|
[1765] | 706 | bb_error_msg_and_die("can't find label for jump to '%s'", label);
|
---|
[821] | 707 | }
|
---|
| 708 |
|
---|
| 709 | static void append(char *s)
|
---|
| 710 | {
|
---|
[1765] | 711 | llist_add_to_end(&G.append_head, xstrdup(s));
|
---|
[821] | 712 | }
|
---|
| 713 |
|
---|
| 714 | static void flush_append(void)
|
---|
| 715 | {
|
---|
| 716 | char *data;
|
---|
| 717 |
|
---|
| 718 | /* Output appended lines. */
|
---|
[1765] | 719 | while ((data = (char *)llist_pop(&G.append_head))) {
|
---|
| 720 | fprintf(G.nonstdout, "%s\n", data);
|
---|
[821] | 721 | free(data);
|
---|
| 722 | }
|
---|
| 723 | }
|
---|
| 724 |
|
---|
| 725 | static void add_input_file(FILE *file)
|
---|
| 726 | {
|
---|
[1765] | 727 | G.input_file_list = xrealloc(G.input_file_list,
|
---|
| 728 | (G.input_file_count + 1) * sizeof(FILE *));
|
---|
| 729 | G.input_file_list[G.input_file_count++] = file;
|
---|
[821] | 730 | }
|
---|
| 731 |
|
---|
[1765] | 732 | /* Get next line of input from G.input_file_list, flushing append buffer and
|
---|
[821] | 733 | * noting if we ran out of files without a newline on the last line we read.
|
---|
| 734 | */
|
---|
[1765] | 735 | enum {
|
---|
| 736 | NO_EOL_CHAR = 1,
|
---|
| 737 | LAST_IS_NUL = 2,
|
---|
| 738 | };
|
---|
| 739 | static char *get_next_line(char *gets_char)
|
---|
[821] | 740 | {
|
---|
[1765] | 741 | char *temp = NULL;
|
---|
[821] | 742 | int len;
|
---|
[1765] | 743 | char gc;
|
---|
[821] | 744 |
|
---|
| 745 | flush_append();
|
---|
[1765] | 746 |
|
---|
| 747 | /* will be returned if last line in the file
|
---|
| 748 | * doesn't end with either '\n' or '\0' */
|
---|
| 749 | gc = NO_EOL_CHAR;
|
---|
| 750 | while (G.current_input_file < G.input_file_count) {
|
---|
| 751 | FILE *fp = G.input_file_list[G.current_input_file];
|
---|
| 752 | /* Read line up to a newline or NUL byte, inclusive,
|
---|
| 753 | * return malloc'ed char[]. length of the chunk read
|
---|
| 754 | * is stored in len. NULL if EOF/error */
|
---|
| 755 | temp = bb_get_chunk_from_file(fp, &len);
|
---|
[821] | 756 | if (temp) {
|
---|
[1765] | 757 | /* len > 0 here, it's ok to do temp[len-1] */
|
---|
| 758 | char c = temp[len-1];
|
---|
| 759 | if (c == '\n' || c == '\0') {
|
---|
| 760 | temp[len-1] = '\0';
|
---|
| 761 | gc = c;
|
---|
| 762 | if (c == '\0') {
|
---|
| 763 | int ch = fgetc(fp);
|
---|
| 764 | if (ch != EOF)
|
---|
| 765 | ungetc(ch, fp);
|
---|
| 766 | else
|
---|
| 767 | gc = LAST_IS_NUL;
|
---|
| 768 | }
|
---|
| 769 | }
|
---|
| 770 | /* else we put NO_EOL_CHAR into *gets_char */
|
---|
[821] | 771 | break;
|
---|
[1765] | 772 |
|
---|
| 773 | /* NB: I had the idea of peeking next file(s) and returning
|
---|
| 774 | * NO_EOL_CHAR only if it is the *last* non-empty
|
---|
| 775 | * input file. But there is a case where this won't work:
|
---|
| 776 | * file1: "a woo\nb woo"
|
---|
| 777 | * file2: "c no\nd no"
|
---|
| 778 | * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
|
---|
| 779 | * (note: *no* newline after "b bang"!) */
|
---|
| 780 | }
|
---|
| 781 | /* Close this file and advance to next one */
|
---|
| 782 | fclose(fp);
|
---|
| 783 | G.current_input_file++;
|
---|
[821] | 784 | }
|
---|
[1765] | 785 | *gets_char = gc;
|
---|
[821] | 786 | return temp;
|
---|
| 787 | }
|
---|
| 788 |
|
---|
[1765] | 789 | /* Output line of text. */
|
---|
| 790 | /* Note:
|
---|
| 791 | * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
|
---|
| 792 | * Without them, we had this:
|
---|
| 793 | * echo -n thingy >z1
|
---|
| 794 | * echo -n again >z2
|
---|
| 795 | * >znull
|
---|
| 796 | * sed "s/i/z/" z1 z2 znull | hexdump -vC
|
---|
| 797 | * output:
|
---|
| 798 | * gnu sed 4.1.5:
|
---|
| 799 | * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
|
---|
| 800 | * bbox:
|
---|
| 801 | * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
|
---|
| 802 | */
|
---|
| 803 | static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
|
---|
[821] | 804 | {
|
---|
[1765] | 805 | char lpc = *last_puts_char;
|
---|
[821] | 806 |
|
---|
[1765] | 807 | /* Need to insert a '\n' between two files because first file's
|
---|
| 808 | * last line wasn't terminated? */
|
---|
| 809 | if (lpc != '\n' && lpc != '\0') {
|
---|
| 810 | fputc('\n', file);
|
---|
| 811 | lpc = '\n';
|
---|
| 812 | }
|
---|
| 813 | fputs(s, file);
|
---|
| 814 |
|
---|
| 815 | /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
|
---|
| 816 | if (s[0])
|
---|
| 817 | lpc = 'x';
|
---|
| 818 |
|
---|
| 819 | /* had trailing '\0' and it was last char of file? */
|
---|
| 820 | if (last_gets_char == LAST_IS_NUL) {
|
---|
| 821 | fputc('\0', file);
|
---|
| 822 | lpc = 'x'; /* */
|
---|
| 823 | } else
|
---|
| 824 | /* had trailing '\n' or '\0'? */
|
---|
| 825 | if (last_gets_char != NO_EOL_CHAR) {
|
---|
| 826 | fputc(last_gets_char, file);
|
---|
| 827 | lpc = last_gets_char;
|
---|
| 828 | }
|
---|
| 829 |
|
---|
| 830 | if (ferror(file)) {
|
---|
| 831 | xfunc_error_retval = 4; /* It's what gnu sed exits with... */
|
---|
[821] | 832 | bb_error_msg_and_die(bb_msg_write_error);
|
---|
| 833 | }
|
---|
[1765] | 834 | *last_puts_char = lpc;
|
---|
| 835 | }
|
---|
[821] | 836 |
|
---|
[1765] | 837 | #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
|
---|
| 838 |
|
---|
| 839 | static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
|
---|
| 840 | {
|
---|
| 841 | int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
|
---|
| 842 | if (retval)
|
---|
| 843 | G.previous_regex_ptr = sed_cmd->beg_match;
|
---|
| 844 | return retval;
|
---|
[821] | 845 | }
|
---|
| 846 |
|
---|
| 847 | /* Process all the lines in all the files */
|
---|
| 848 |
|
---|
| 849 | static void process_files(void)
|
---|
| 850 | {
|
---|
| 851 | char *pattern_space, *next_line;
|
---|
[1765] | 852 | int linenum = 0;
|
---|
| 853 | char last_puts_char = '\n';
|
---|
| 854 | char last_gets_char, next_gets_char;
|
---|
| 855 | sed_cmd_t *sed_cmd;
|
---|
| 856 | int substituted;
|
---|
[821] | 857 |
|
---|
| 858 | /* Prime the pump */
|
---|
[1765] | 859 | next_line = get_next_line(&next_gets_char);
|
---|
[821] | 860 |
|
---|
| 861 | /* go through every line in each file */
|
---|
[1765] | 862 | again:
|
---|
| 863 | substituted = 0;
|
---|
[821] | 864 |
|
---|
[1765] | 865 | /* Advance to next line. Stop if out of lines. */
|
---|
| 866 | pattern_space = next_line;
|
---|
| 867 | if (!pattern_space) return;
|
---|
| 868 | last_gets_char = next_gets_char;
|
---|
[821] | 869 |
|
---|
[1765] | 870 | /* Read one line in advance so we can act on the last line,
|
---|
| 871 | * the '$' address */
|
---|
| 872 | next_line = get_next_line(&next_gets_char);
|
---|
| 873 | linenum++;
|
---|
[821] | 874 | restart:
|
---|
[1765] | 875 | /* for every line, go through all the commands */
|
---|
| 876 | for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
---|
| 877 | int old_matched, matched;
|
---|
[821] | 878 |
|
---|
[1765] | 879 | old_matched = sed_cmd->in_match;
|
---|
[821] | 880 |
|
---|
[1765] | 881 | /* Determine if this command matches this line: */
|
---|
[821] | 882 |
|
---|
[1765] | 883 | /* Are we continuing a previous multi-line match? */
|
---|
| 884 | sed_cmd->in_match = sed_cmd->in_match
|
---|
[821] | 885 | /* Or is no range necessary? */
|
---|
[1765] | 886 | || (!sed_cmd->beg_line && !sed_cmd->end_line
|
---|
| 887 | && !sed_cmd->beg_match && !sed_cmd->end_match)
|
---|
[821] | 888 | /* Or did we match the start of a numerical range? */
|
---|
[1765] | 889 | || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
|
---|
[821] | 890 | /* Or does this line match our begin address regex? */
|
---|
[1765] | 891 | || (beg_match(sed_cmd, pattern_space))
|
---|
[821] | 892 | /* Or did we match last line of input? */
|
---|
[1765] | 893 | || (sed_cmd->beg_line == -1 && next_line == NULL);
|
---|
[821] | 894 |
|
---|
[1765] | 895 | /* Snapshot the value */
|
---|
[821] | 896 |
|
---|
[1765] | 897 | matched = sed_cmd->in_match;
|
---|
[821] | 898 |
|
---|
[1765] | 899 | /* Is this line the end of the current match? */
|
---|
[821] | 900 |
|
---|
[1765] | 901 | if (matched) {
|
---|
| 902 | sed_cmd->in_match = !(
|
---|
| 903 | /* has the ending line come, or is this a single address command? */
|
---|
| 904 | (sed_cmd->end_line ?
|
---|
| 905 | sed_cmd->end_line == -1 ?
|
---|
| 906 | !next_line
|
---|
| 907 | : (sed_cmd->end_line <= linenum)
|
---|
| 908 | : !sed_cmd->end_match
|
---|
| 909 | )
|
---|
| 910 | /* or does this line matches our last address regex */
|
---|
| 911 | || (sed_cmd->end_match && old_matched
|
---|
| 912 | && (regexec(sed_cmd->end_match,
|
---|
| 913 | pattern_space, 0, NULL, 0) == 0))
|
---|
| 914 | );
|
---|
| 915 | }
|
---|
| 916 |
|
---|
| 917 | /* Skip blocks of commands we didn't match. */
|
---|
| 918 | if (sed_cmd->cmd == '{') {
|
---|
| 919 | if (sed_cmd->invert ? matched : !matched) {
|
---|
| 920 | while (sed_cmd->cmd != '}') {
|
---|
| 921 | sed_cmd = sed_cmd->next;
|
---|
| 922 | if (!sed_cmd)
|
---|
| 923 | bb_error_msg_and_die("unterminated {");
|
---|
| 924 | }
|
---|
[821] | 925 | }
|
---|
[1765] | 926 | continue;
|
---|
| 927 | }
|
---|
[821] | 928 |
|
---|
[1765] | 929 | /* Okay, so did this line match? */
|
---|
| 930 | if (sed_cmd->invert ? !matched : matched) {
|
---|
| 931 | /* Update last used regex in case a blank substitute BRE is found */
|
---|
| 932 | if (sed_cmd->beg_match) {
|
---|
| 933 | G.previous_regex_ptr = sed_cmd->beg_match;
|
---|
[821] | 934 | }
|
---|
| 935 |
|
---|
[1765] | 936 | /* actual sedding */
|
---|
| 937 | switch (sed_cmd->cmd) {
|
---|
[821] | 938 |
|
---|
[1765] | 939 | /* Print line number */
|
---|
| 940 | case '=':
|
---|
| 941 | fprintf(G.nonstdout, "%d\n", linenum);
|
---|
| 942 | break;
|
---|
[821] | 943 |
|
---|
[1765] | 944 | /* Write the current pattern space up to the first newline */
|
---|
| 945 | case 'P':
|
---|
| 946 | {
|
---|
| 947 | char *tmp = strchr(pattern_space, '\n');
|
---|
[821] | 948 |
|
---|
[1765] | 949 | if (tmp) {
|
---|
| 950 | *tmp = '\0';
|
---|
| 951 | /* TODO: explain why '\n' below */
|
---|
| 952 | sed_puts(pattern_space, '\n');
|
---|
| 953 | *tmp = '\n';
|
---|
| 954 | break;
|
---|
| 955 | }
|
---|
| 956 | /* Fall Through */
|
---|
| 957 | }
|
---|
[821] | 958 |
|
---|
[1765] | 959 | /* Write the current pattern space to output */
|
---|
| 960 | case 'p':
|
---|
| 961 | /* NB: we print this _before_ the last line
|
---|
| 962 | * (of current file) is printed. Even if
|
---|
| 963 | * that line is nonterminated, we print
|
---|
| 964 | * '\n' here (gnu sed does the same) */
|
---|
| 965 | sed_puts(pattern_space, '\n');
|
---|
| 966 | break;
|
---|
| 967 | /* Delete up through first newline */
|
---|
| 968 | case 'D':
|
---|
| 969 | {
|
---|
| 970 | char *tmp = strchr(pattern_space, '\n');
|
---|
[821] | 971 |
|
---|
[1765] | 972 | if (tmp) {
|
---|
| 973 | tmp = xstrdup(tmp+1);
|
---|
| 974 | free(pattern_space);
|
---|
| 975 | pattern_space = tmp;
|
---|
| 976 | goto restart;
|
---|
| 977 | }
|
---|
| 978 | }
|
---|
| 979 | /* discard this line. */
|
---|
| 980 | case 'd':
|
---|
| 981 | goto discard_line;
|
---|
[821] | 982 |
|
---|
[1765] | 983 | /* Substitute with regex */
|
---|
| 984 | case 's':
|
---|
| 985 | if (!do_subst_command(sed_cmd, &pattern_space))
|
---|
| 986 | break;
|
---|
| 987 | substituted |= 1;
|
---|
[821] | 988 |
|
---|
[1765] | 989 | /* handle p option */
|
---|
| 990 | if (sed_cmd->sub_p)
|
---|
| 991 | sed_puts(pattern_space, last_gets_char);
|
---|
| 992 | /* handle w option */
|
---|
| 993 | if (sed_cmd->sw_file)
|
---|
| 994 | puts_maybe_newline(
|
---|
| 995 | pattern_space, sed_cmd->sw_file,
|
---|
| 996 | &sed_cmd->sw_last_char, last_gets_char);
|
---|
| 997 | break;
|
---|
[821] | 998 |
|
---|
[1765] | 999 | /* Append line to linked list to be printed later */
|
---|
| 1000 | case 'a':
|
---|
| 1001 | append(sed_cmd->string);
|
---|
| 1002 | break;
|
---|
[821] | 1003 |
|
---|
[1765] | 1004 | /* Insert text before this line */
|
---|
| 1005 | case 'i':
|
---|
| 1006 | sed_puts(sed_cmd->string, '\n');
|
---|
| 1007 | break;
|
---|
[821] | 1008 |
|
---|
[1765] | 1009 | /* Cut and paste text (replace) */
|
---|
| 1010 | case 'c':
|
---|
| 1011 | /* Only triggers on last line of a matching range. */
|
---|
| 1012 | if (!sed_cmd->in_match)
|
---|
| 1013 | sed_puts(sed_cmd->string, NO_EOL_CHAR);
|
---|
| 1014 | goto discard_line;
|
---|
[821] | 1015 |
|
---|
[1765] | 1016 | /* Read file, append contents to output */
|
---|
| 1017 | case 'r':
|
---|
| 1018 | {
|
---|
| 1019 | FILE *rfile;
|
---|
[821] | 1020 |
|
---|
[1765] | 1021 | rfile = fopen(sed_cmd->string, "r");
|
---|
| 1022 | if (rfile) {
|
---|
| 1023 | char *line;
|
---|
[821] | 1024 |
|
---|
[1765] | 1025 | while ((line = xmalloc_getline(rfile))
|
---|
| 1026 | != NULL)
|
---|
| 1027 | append(line);
|
---|
| 1028 | xprint_and_close_file(rfile);
|
---|
| 1029 | }
|
---|
[821] | 1030 |
|
---|
[1765] | 1031 | break;
|
---|
| 1032 | }
|
---|
[821] | 1033 |
|
---|
[1765] | 1034 | /* Write pattern space to file. */
|
---|
| 1035 | case 'w':
|
---|
| 1036 | puts_maybe_newline(
|
---|
| 1037 | pattern_space, sed_cmd->sw_file,
|
---|
| 1038 | &sed_cmd->sw_last_char, last_gets_char);
|
---|
| 1039 | break;
|
---|
[821] | 1040 |
|
---|
[1765] | 1041 | /* Read next line from input */
|
---|
| 1042 | case 'n':
|
---|
| 1043 | if (!G.be_quiet)
|
---|
| 1044 | sed_puts(pattern_space, last_gets_char);
|
---|
| 1045 | if (next_line) {
|
---|
| 1046 | free(pattern_space);
|
---|
| 1047 | pattern_space = next_line;
|
---|
| 1048 | last_gets_char = next_gets_char;
|
---|
| 1049 | next_line = get_next_line(&next_gets_char);
|
---|
| 1050 | linenum++;
|
---|
| 1051 | break;
|
---|
| 1052 | }
|
---|
| 1053 | /* fall through */
|
---|
[821] | 1054 |
|
---|
[1765] | 1055 | /* Quit. End of script, end of input. */
|
---|
| 1056 | case 'q':
|
---|
| 1057 | /* Exit the outer while loop */
|
---|
| 1058 | free(next_line);
|
---|
| 1059 | next_line = NULL;
|
---|
| 1060 | goto discard_commands;
|
---|
[821] | 1061 |
|
---|
[1765] | 1062 | /* Append the next line to the current line */
|
---|
| 1063 | case 'N':
|
---|
| 1064 | {
|
---|
| 1065 | int len;
|
---|
| 1066 | /* If no next line, jump to end of script and exit. */
|
---|
| 1067 | if (next_line == NULL) {
|
---|
| 1068 | /* Jump to end of script and exit */
|
---|
| 1069 | free(next_line);
|
---|
| 1070 | next_line = NULL;
|
---|
| 1071 | goto discard_line;
|
---|
| 1072 | /* append next_line, read new next_line. */
|
---|
| 1073 | }
|
---|
| 1074 | len = strlen(pattern_space);
|
---|
| 1075 | pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
|
---|
| 1076 | pattern_space[len] = '\n';
|
---|
| 1077 | strcpy(pattern_space + len+1, next_line);
|
---|
| 1078 | last_gets_char = next_gets_char;
|
---|
| 1079 | next_line = get_next_line(&next_gets_char);
|
---|
| 1080 | linenum++;
|
---|
| 1081 | break;
|
---|
| 1082 | }
|
---|
[821] | 1083 |
|
---|
[1765] | 1084 | /* Test/branch if substitution occurred */
|
---|
| 1085 | case 't':
|
---|
| 1086 | if (!substituted) break;
|
---|
| 1087 | substituted = 0;
|
---|
| 1088 | /* Fall through */
|
---|
| 1089 | /* Test/branch if substitution didn't occur */
|
---|
| 1090 | case 'T':
|
---|
| 1091 | if (substituted) break;
|
---|
| 1092 | /* Fall through */
|
---|
| 1093 | /* Branch to label */
|
---|
| 1094 | case 'b':
|
---|
| 1095 | if (!sed_cmd->string) goto discard_commands;
|
---|
| 1096 | else sed_cmd = branch_to(sed_cmd->string);
|
---|
| 1097 | break;
|
---|
| 1098 | /* Transliterate characters */
|
---|
| 1099 | case 'y':
|
---|
| 1100 | {
|
---|
| 1101 | int i, j;
|
---|
[821] | 1102 |
|
---|
[1765] | 1103 | for (i = 0; pattern_space[i]; i++) {
|
---|
| 1104 | for (j = 0; sed_cmd->string[j]; j += 2) {
|
---|
| 1105 | if (pattern_space[i] == sed_cmd->string[j]) {
|
---|
| 1106 | pattern_space[i] = sed_cmd->string[j + 1];
|
---|
| 1107 | break;
|
---|
[821] | 1108 | }
|
---|
| 1109 | }
|
---|
[1765] | 1110 | }
|
---|
[821] | 1111 |
|
---|
[1765] | 1112 | break;
|
---|
| 1113 | }
|
---|
| 1114 | case 'g': /* Replace pattern space with hold space */
|
---|
| 1115 | free(pattern_space);
|
---|
| 1116 | pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
|
---|
| 1117 | break;
|
---|
| 1118 | case 'G': /* Append newline and hold space to pattern space */
|
---|
| 1119 | {
|
---|
| 1120 | int pattern_space_size = 2;
|
---|
| 1121 | int hold_space_size = 0;
|
---|
[821] | 1122 |
|
---|
[1765] | 1123 | if (pattern_space)
|
---|
| 1124 | pattern_space_size += strlen(pattern_space);
|
---|
| 1125 | if (G.hold_space)
|
---|
| 1126 | hold_space_size = strlen(G.hold_space);
|
---|
| 1127 | pattern_space = xrealloc(pattern_space,
|
---|
| 1128 | pattern_space_size + hold_space_size);
|
---|
| 1129 | if (pattern_space_size == 2)
|
---|
| 1130 | pattern_space[0] = 0;
|
---|
| 1131 | strcat(pattern_space, "\n");
|
---|
| 1132 | if (G.hold_space)
|
---|
| 1133 | strcat(pattern_space, G.hold_space);
|
---|
| 1134 | last_gets_char = '\n';
|
---|
[821] | 1135 |
|
---|
[1765] | 1136 | break;
|
---|
| 1137 | }
|
---|
| 1138 | case 'h': /* Replace hold space with pattern space */
|
---|
| 1139 | free(G.hold_space);
|
---|
| 1140 | G.hold_space = xstrdup(pattern_space);
|
---|
| 1141 | break;
|
---|
| 1142 | case 'H': /* Append newline and pattern space to hold space */
|
---|
| 1143 | {
|
---|
| 1144 | int hold_space_size = 2;
|
---|
| 1145 | int pattern_space_size = 0;
|
---|
[821] | 1146 |
|
---|
[1765] | 1147 | if (G.hold_space)
|
---|
| 1148 | hold_space_size += strlen(G.hold_space);
|
---|
| 1149 | if (pattern_space)
|
---|
| 1150 | pattern_space_size = strlen(pattern_space);
|
---|
| 1151 | G.hold_space = xrealloc(G.hold_space,
|
---|
| 1152 | hold_space_size + pattern_space_size);
|
---|
[821] | 1153 |
|
---|
[1765] | 1154 | if (hold_space_size == 2)
|
---|
| 1155 | *G.hold_space = 0;
|
---|
| 1156 | strcat(G.hold_space, "\n");
|
---|
| 1157 | if (pattern_space)
|
---|
| 1158 | strcat(G.hold_space, pattern_space);
|
---|
[821] | 1159 |
|
---|
[1765] | 1160 | break;
|
---|
[821] | 1161 | }
|
---|
[1765] | 1162 | case 'x': /* Exchange hold and pattern space */
|
---|
| 1163 | {
|
---|
| 1164 | char *tmp = pattern_space;
|
---|
| 1165 | pattern_space = G.hold_space ? : xzalloc(1);
|
---|
| 1166 | last_gets_char = '\n';
|
---|
| 1167 | G.hold_space = tmp;
|
---|
| 1168 | break;
|
---|
| 1169 | }
|
---|
| 1170 | }
|
---|
[821] | 1171 | }
|
---|
[1765] | 1172 | }
|
---|
[821] | 1173 |
|
---|
[1765] | 1174 | /*
|
---|
| 1175 | * exit point from sedding...
|
---|
| 1176 | */
|
---|
| 1177 | discard_commands:
|
---|
| 1178 | /* we will print the line unless we were told to be quiet ('-n')
|
---|
| 1179 | or if the line was suppressed (ala 'd'elete) */
|
---|
| 1180 | if (!G.be_quiet)
|
---|
| 1181 | sed_puts(pattern_space, last_gets_char);
|
---|
[821] | 1182 |
|
---|
[1765] | 1183 | /* Delete and such jump here. */
|
---|
| 1184 | discard_line:
|
---|
| 1185 | flush_append();
|
---|
| 1186 | free(pattern_space);
|
---|
| 1187 |
|
---|
| 1188 | goto again;
|
---|
[821] | 1189 | }
|
---|
| 1190 |
|
---|
| 1191 | /* It is possible to have a command line argument with embedded
|
---|
[1765] | 1192 | * newlines. This counts as multiple command lines.
|
---|
| 1193 | * However, newline can be escaped: 's/e/z\<newline>z/'
|
---|
| 1194 | * We check for this.
|
---|
| 1195 | */
|
---|
[821] | 1196 |
|
---|
| 1197 | static void add_cmd_block(char *cmdstr)
|
---|
| 1198 | {
|
---|
[1765] | 1199 | char *sv, *eol;
|
---|
[821] | 1200 |
|
---|
[1765] | 1201 | cmdstr = sv = xstrdup(cmdstr);
|
---|
| 1202 | do {
|
---|
| 1203 | eol = strchr(cmdstr, '\n');
|
---|
| 1204 | next:
|
---|
| 1205 | if (eol) {
|
---|
| 1206 | /* Count preceding slashes */
|
---|
| 1207 | int slashes = 0;
|
---|
| 1208 | char *sl = eol;
|
---|
| 1209 |
|
---|
| 1210 | while (sl != cmdstr && *--sl == '\\')
|
---|
| 1211 | slashes++;
|
---|
| 1212 | /* Odd number of preceding slashes - newline is escaped */
|
---|
| 1213 | if (slashes & 1) {
|
---|
| 1214 | strcpy(eol-1, eol);
|
---|
| 1215 | eol = strchr(eol, '\n');
|
---|
| 1216 | goto next;
|
---|
| 1217 | }
|
---|
| 1218 | *eol = '\0';
|
---|
| 1219 | }
|
---|
| 1220 | add_cmd(cmdstr);
|
---|
| 1221 | cmdstr = eol + 1;
|
---|
| 1222 | } while (eol);
|
---|
| 1223 | free(sv);
|
---|
[821] | 1224 | }
|
---|
| 1225 |
|
---|
[1765] | 1226 | int sed_main(int argc, char **argv);
|
---|
[821] | 1227 | int sed_main(int argc, char **argv)
|
---|
| 1228 | {
|
---|
[1765] | 1229 | enum {
|
---|
| 1230 | OPT_in_place = 1 << 0,
|
---|
| 1231 | };
|
---|
| 1232 | unsigned opt;
|
---|
| 1233 | llist_t *opt_e, *opt_f;
|
---|
| 1234 | int status = EXIT_SUCCESS;
|
---|
[821] | 1235 |
|
---|
[1765] | 1236 | INIT_G();
|
---|
[821] | 1237 |
|
---|
| 1238 | /* destroy command strings on exit */
|
---|
| 1239 | if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
|
---|
| 1240 |
|
---|
| 1241 | /* Lie to autoconf when it starts asking stupid questions. */
|
---|
[1765] | 1242 | if (argc == 2 && !strcmp(argv[1], "--version")) {
|
---|
| 1243 | puts("This is not GNU sed version 4.0");
|
---|
| 1244 | return 0;
|
---|
[821] | 1245 | }
|
---|
| 1246 |
|
---|
| 1247 | /* do normal option parsing */
|
---|
[1765] | 1248 | opt_e = opt_f = NULL;
|
---|
| 1249 | opt_complementary = "e::f::" /* can occur multiple times */
|
---|
| 1250 | "nn"; /* count -n */
|
---|
| 1251 | opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
|
---|
| 1252 | &G.be_quiet); /* counter for -n */
|
---|
| 1253 | argc -= optind;
|
---|
| 1254 | argv += optind;
|
---|
| 1255 | if (opt & OPT_in_place) { // -i
|
---|
| 1256 | atexit(cleanup_outname);
|
---|
| 1257 | }
|
---|
| 1258 | if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
|
---|
| 1259 | //if (opt & 0x4) G.be_quiet++; // -n
|
---|
| 1260 | while (opt_e) { // -e
|
---|
| 1261 | add_cmd_block(opt_e->data);
|
---|
| 1262 | opt_e = opt_e->link;
|
---|
| 1263 | /* we leak opt_e here... */
|
---|
| 1264 | }
|
---|
| 1265 | while (opt_f) { // -f
|
---|
| 1266 | char *line;
|
---|
| 1267 | FILE *cmdfile;
|
---|
| 1268 | cmdfile = xfopen(opt_f->data, "r");
|
---|
| 1269 | while ((line = xmalloc_getline(cmdfile)) != NULL) {
|
---|
| 1270 | add_cmd(line);
|
---|
| 1271 | free(line);
|
---|
[821] | 1272 | }
|
---|
[1765] | 1273 | fclose(cmdfile);
|
---|
| 1274 | opt_f = opt_f->link;
|
---|
| 1275 | /* we leak opt_f here... */
|
---|
[821] | 1276 | }
|
---|
[1765] | 1277 | /* if we didn't get a pattern from -e or -f, use argv[0] */
|
---|
| 1278 | if (!(opt & 0x18)) {
|
---|
| 1279 | if (!argc)
|
---|
[821] | 1280 | bb_show_usage();
|
---|
[1765] | 1281 | add_cmd_block(*argv++);
|
---|
| 1282 | argc--;
|
---|
[821] | 1283 | }
|
---|
| 1284 | /* Flush any unfinished commands. */
|
---|
| 1285 | add_cmd("");
|
---|
| 1286 |
|
---|
| 1287 | /* By default, we write to stdout */
|
---|
[1765] | 1288 | G.nonstdout = stdout;
|
---|
[821] | 1289 |
|
---|
[1765] | 1290 | /* argv[0..(argc-1)] should be names of file to process. If no
|
---|
[821] | 1291 | * files were specified or '-' was specified, take input from stdin.
|
---|
| 1292 | * Otherwise, we process all the files specified. */
|
---|
[1765] | 1293 | if (argv[0] == NULL) {
|
---|
| 1294 | if (opt & OPT_in_place)
|
---|
| 1295 | bb_error_msg_and_die(bb_msg_requires_arg, "-i");
|
---|
[821] | 1296 | add_input_file(stdin);
|
---|
| 1297 | process_files();
|
---|
| 1298 | } else {
|
---|
| 1299 | int i;
|
---|
| 1300 | FILE *file;
|
---|
| 1301 |
|
---|
[1765] | 1302 | for (i = 0; i < argc; i++) {
|
---|
| 1303 | struct stat statbuf;
|
---|
| 1304 | int nonstdoutfd;
|
---|
| 1305 |
|
---|
| 1306 | if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
|
---|
[821] | 1307 | add_input_file(stdin);
|
---|
| 1308 | process_files();
|
---|
[1765] | 1309 | continue;
|
---|
| 1310 | }
|
---|
| 1311 | file = fopen_or_warn(argv[i], "r");
|
---|
| 1312 | if (!file) {
|
---|
| 1313 | status = EXIT_FAILURE;
|
---|
| 1314 | continue;
|
---|
| 1315 | }
|
---|
| 1316 | if (!(opt & OPT_in_place)) {
|
---|
| 1317 | add_input_file(file);
|
---|
| 1318 | continue;
|
---|
| 1319 | }
|
---|
[821] | 1320 |
|
---|
[1765] | 1321 | G.outname = xasprintf("%sXXXXXX", argv[i]);
|
---|
| 1322 | nonstdoutfd = mkstemp(G.outname);
|
---|
| 1323 | if (-1 == nonstdoutfd)
|
---|
| 1324 | bb_perror_msg_and_die("cannot create temp file %s", G.outname);
|
---|
| 1325 | G.nonstdout = fdopen(nonstdoutfd, "w");
|
---|
[821] | 1326 |
|
---|
[1765] | 1327 | /* Set permissions of output file */
|
---|
[821] | 1328 |
|
---|
[1765] | 1329 | fstat(fileno(file), &statbuf);
|
---|
| 1330 | fchmod(nonstdoutfd, statbuf.st_mode);
|
---|
| 1331 | add_input_file(file);
|
---|
| 1332 | process_files();
|
---|
| 1333 | fclose(G.nonstdout);
|
---|
[821] | 1334 |
|
---|
[1765] | 1335 | G.nonstdout = stdout;
|
---|
| 1336 | /* unlink(argv[i]); */
|
---|
| 1337 | // FIXME: error check / message?
|
---|
| 1338 | rename(G.outname, argv[i]);
|
---|
| 1339 | free(G.outname);
|
---|
| 1340 | G.outname = 0;
|
---|
[821] | 1341 | }
|
---|
[1765] | 1342 | if (G.input_file_count > G.current_input_file)
|
---|
| 1343 | process_files();
|
---|
[821] | 1344 | }
|
---|
| 1345 |
|
---|
| 1346 | return status;
|
---|
| 1347 | }
|
---|