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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13 | * Licensed under GPL version 2, see file LICENSE in this tarball for details.
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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 | /* Each sed command turns into one of these structures. */
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65 | typedef struct sed_cmd_s {
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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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68 |
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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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75 |
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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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78 |
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79 | unsigned short which_match; /* (s) Which match to replace (0 for all) */
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80 |
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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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85 |
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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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90 | } sed_cmd_t;
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91 |
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92 | static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
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93 |
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94 | struct globals {
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95 | /* options */
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96 | int be_quiet, regex_type;
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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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101 | int input_file_count, current_input_file;
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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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106 |
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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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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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128 |
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129 |
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130 | #if ENABLE_FEATURE_CLEAN_UP
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131 | static void sed_free_and_close_stuff(void)
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132 | {
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133 | sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
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134 |
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135 | llist_free(G.append_head, free);
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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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140 | if (sed_cmd->sw_file)
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141 | xprint_and_close_file(sed_cmd->sw_file);
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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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160 | if (G.hold_space) free(G.hold_space);
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161 |
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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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164 | }
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165 | #else
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166 | void sed_free_and_close_stuff(void);
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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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173 | if (G.outname) unlink(G.outname);
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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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178 | static void parse_escapes(char *dest, const char *string, int len, char from, char to)
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179 | {
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180 | int i = 0;
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181 |
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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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187 | continue;
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188 | }
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189 | *dest++ = string[i++];
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190 | }
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191 | *dest++ = string[i++];
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192 | }
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193 | *dest = 0;
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194 | }
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195 |
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196 | static char *copy_parsing_escapes(const char *string, int len)
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197 | {
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198 | char *dest = xmalloc(len + 1);
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199 |
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200 | parse_escapes(dest, string, len, 'n', '\n');
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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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209 | * a backslash ('\'). A negative delimiter disables square bracket checking.
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210 | */
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211 | static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
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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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218 | if (delimiter < 0) {
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219 | bracket--;
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220 | delimiter = -delimiter;
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221 | }
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222 |
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223 | for (; (ch = str[idx]); idx++) {
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224 | if (bracket >= 0) {
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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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232 | else if (bracket == -1 && ch == '[')
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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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239 | bb_error_msg_and_die("unmatched '%c'", delimiter);
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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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245 | static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
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246 | {
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247 | const char *cmdstr_ptr = cmdstr;
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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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253 | if (*cmdstr == '\0')
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254 | bb_error_msg_and_die("bad format in substitution expression");
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255 | delimiter = *cmdstr_ptr++;
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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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263 | idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
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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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272 | static int get_address(const char *my_str, int *linenum, regex_t ** regex)
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273 | {
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274 | const char *pos = my_str;
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275 |
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276 | if (isdigit(*my_str)) {
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277 | *linenum = strtol(my_str, (char**)&pos, 10);
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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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287 | delimiter = '/';
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288 | if (*my_str == '\\') delimiter = *++pos;
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289 | next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
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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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293 | free(temp);
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294 | /* Move position to next character after last delimiter */
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295 | pos += (next+1);
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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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301 | static int parse_file_cmd(sed_cmd_t *sed_cmd, const char *filecmdstr, char **retval)
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302 | {
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303 | int start = 0, idx, hack = 0;
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304 |
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305 | /* Skip whitespace, then grab filename to end of line */
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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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312 | /* If lines glued together, put backslash back. */
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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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320 |
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321 | return idx;
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322 | }
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323 |
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324 | static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
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325 | {
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326 | int cflags = G.regex_type;
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327 | char *match;
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328 | int idx;
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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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345 | sed_cmd->which_match = 1;
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346 | while (substr[++idx]) {
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347 | /* Parse match number */
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348 | if (isdigit(substr[idx])) {
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349 | if (match[0] != '^') {
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350 | /* Match 0 treated as all, multiple matches we take the last one. */
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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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355 | }
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356 | continue;
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357 | }
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358 | /* Skip spaces */
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359 | if (isspace(substr[idx])) continue;
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360 |
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361 | switch (substr[idx]) {
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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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376 | }
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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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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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397 | sed_cmd->sub_match = xmalloc(sizeof(regex_t));
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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 |
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402 | return idx;
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403 | }
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404 |
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405 | /*
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406 | * Process the commands arguments
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407 | */
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408 | static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
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409 | {
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410 | /* handle (s)ubstitution command */
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411 | if (sed_cmd->cmd == 's')
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412 | cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
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413 | /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
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414 | else if (strchr("aic", sed_cmd->cmd)) {
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415 | if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
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416 | bb_error_msg_and_die
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417 | ("only a beginning address can be specified for edit commands");
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418 | for (;;) {
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419 | if (*cmdstr == '\n' || *cmdstr == '\\') {
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420 | cmdstr++;
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421 | break;
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422 | } else if (isspace(*cmdstr))
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423 | cmdstr++;
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424 | else
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425 | break;
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426 | }
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427 | sed_cmd->string = xstrdup(cmdstr);
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428 | parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), 0, 0);
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429 | cmdstr += strlen(cmdstr);
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430 | /* handle file cmds: (r)ead */
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431 | } else if (strchr("rw", sed_cmd->cmd)) {
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432 | if (sed_cmd->end_line || sed_cmd->end_match)
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433 | bb_error_msg_and_die("command only uses one address");
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434 | cmdstr += parse_file_cmd(sed_cmd, cmdstr, &sed_cmd->string);
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435 | if (sed_cmd->cmd == 'w') {
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436 | sed_cmd->sw_file = xfopen(sed_cmd->string, "w");
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437 | sed_cmd->sw_last_char = '\n';
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438 | }
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439 | /* handle branch commands */
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440 | } else if (strchr(":btT", sed_cmd->cmd)) {
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441 | int length;
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442 |
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443 | cmdstr = skip_whitespace(cmdstr);
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444 | length = strcspn(cmdstr, semicolon_whitespace);
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445 | if (length) {
|
---|
446 | sed_cmd->string = xstrndup(cmdstr, length);
|
---|
447 | cmdstr += length;
|
---|
448 | }
|
---|
449 | }
|
---|
450 | /* translation command */
|
---|
451 | else if (sed_cmd->cmd == 'y') {
|
---|
452 | char *match, *replace;
|
---|
453 | int i = cmdstr[0];
|
---|
454 |
|
---|
455 | cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
|
---|
456 | /* \n already parsed, but \delimiter needs unescaping. */
|
---|
457 | parse_escapes(match, match, strlen(match), i, i);
|
---|
458 | parse_escapes(replace, replace, strlen(replace), i, i);
|
---|
459 |
|
---|
460 | sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
|
---|
461 | for (i = 0; match[i] && replace[i]; i++) {
|
---|
462 | sed_cmd->string[i*2] = match[i];
|
---|
463 | sed_cmd->string[i*2+1] = replace[i];
|
---|
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) {
|
---|
472 | bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
|
---|
473 | }
|
---|
474 |
|
---|
475 | /* give back whatever's left over */
|
---|
476 | return cmdstr;
|
---|
477 | }
|
---|
478 |
|
---|
479 |
|
---|
480 | /* Parse address+command sets, skipping comment lines. */
|
---|
481 |
|
---|
482 | static void add_cmd(const char *cmdstr)
|
---|
483 | {
|
---|
484 | sed_cmd_t *sed_cmd;
|
---|
485 | int temp;
|
---|
486 |
|
---|
487 | /* Append this line to any unfinished line from last time. */
|
---|
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;
|
---|
492 | }
|
---|
493 |
|
---|
494 | /* If this line ends with backslash, request next line. */
|
---|
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';
|
---|
500 | return;
|
---|
501 | }
|
---|
502 |
|
---|
503 | /* Loop parsing all commands in this line. */
|
---|
504 | while (*cmdstr) {
|
---|
505 | /* Skip leading whitespace and semicolons */
|
---|
506 | cmdstr += strspn(cmdstr, semicolon_whitespace);
|
---|
507 |
|
---|
508 | /* If no more commands, exit. */
|
---|
509 | if (!*cmdstr) break;
|
---|
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 */
|
---|
514 | if (cmdstr[1] == 'n')
|
---|
515 | G.be_quiet++;
|
---|
516 | cmdstr = strpbrk(cmdstr, "\n\r");
|
---|
517 | if (!cmdstr) break;
|
---|
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);
|
---|
538 | if (!idx)
|
---|
539 | bb_error_msg_and_die("no address after comma");
|
---|
540 | cmdstr += idx;
|
---|
541 | }
|
---|
542 |
|
---|
543 | /* skip whitespace before the command */
|
---|
544 | cmdstr = skip_whitespace(cmdstr);
|
---|
545 |
|
---|
546 | /* Check for inversion flag */
|
---|
547 | if (*cmdstr == '!') {
|
---|
548 | sed_cmd->invert = 1;
|
---|
549 | cmdstr++;
|
---|
550 |
|
---|
551 | /* skip whitespace before the command */
|
---|
552 | cmdstr = skip_whitespace(cmdstr);
|
---|
553 | }
|
---|
554 |
|
---|
555 | /* last part (mandatory) will be a command */
|
---|
556 | if (!*cmdstr)
|
---|
557 | bb_error_msg_and_die("missing command");
|
---|
558 | sed_cmd->cmd = *(cmdstr++);
|
---|
559 | cmdstr = parse_cmd_args(sed_cmd, cmdstr);
|
---|
560 |
|
---|
561 | /* Add the command to the command array */
|
---|
562 | G.sed_cmd_tail->next = sed_cmd;
|
---|
563 | G.sed_cmd_tail = G.sed_cmd_tail->next;
|
---|
564 | }
|
---|
565 |
|
---|
566 | /* If we glued multiple lines together, free the memory. */
|
---|
567 | free(G.add_cmd_line);
|
---|
568 | G.add_cmd_line = NULL;
|
---|
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 | {
|
---|
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;
|
---|
581 | }
|
---|
582 | G.pipeline.buf[G.pipeline.idx++] = c;
|
---|
583 | }
|
---|
584 |
|
---|
585 | static void do_subst_w_backrefs(char *line, char *replace)
|
---|
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 */
|
---|
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;
|
---|
609 | }
|
---|
610 | /* if we find an unescaped '&' print out the whole matched text. */
|
---|
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 | }
|
---|
617 | /* Otherwise just output the character. */
|
---|
618 | pipe_putc(replace[i]);
|
---|
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;
|
---|
626 | int match_count = 0;
|
---|
627 | regex_t *current_regex;
|
---|
628 |
|
---|
629 | /* Handle empty regex. */
|
---|
630 | if (sed_cmd->sub_match == NULL) {
|
---|
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;
|
---|
636 |
|
---|
637 | /* Find the first match */
|
---|
638 | if (REG_NOMATCH == regexec(current_regex, oldline, 10, G.regmatch, 0))
|
---|
639 | return 0;
|
---|
640 |
|
---|
641 | /* Initialize temporary output buffer. */
|
---|
642 | G.pipeline.buf = xmalloc(PIPE_GROW);
|
---|
643 | G.pipeline.len = PIPE_GROW;
|
---|
644 | G.pipeline.idx = 0;
|
---|
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' */
|
---|
654 | if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
|
---|
655 | pipe_putc(*oldline++);
|
---|
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 */
|
---|
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++);
|
---|
666 | continue;
|
---|
667 | }
|
---|
668 |
|
---|
669 | /* print everything before the match */
|
---|
670 | for (i = 0; i < G.regmatch[0].rm_so; i++)
|
---|
671 | pipe_putc(oldline[i]);
|
---|
672 |
|
---|
673 | /* then print the substitution string */
|
---|
674 | do_subst_w_backrefs(oldline, sed_cmd->string);
|
---|
675 |
|
---|
676 | /* advance past the match */
|
---|
677 | oldline += G.regmatch[0].rm_eo;
|
---|
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;
|
---|
683 | } while (*oldline && (regexec(current_regex, oldline, 10, G.regmatch, 0) != REG_NOMATCH));
|
---|
684 |
|
---|
685 | /* Copy rest of string into output pipeline */
|
---|
686 |
|
---|
687 | while (*oldline)
|
---|
688 | pipe_putc(*oldline++);
|
---|
689 | pipe_putc(0);
|
---|
690 |
|
---|
691 | free(*line);
|
---|
692 | *line = G.pipeline.buf;
|
---|
693 | return altered;
|
---|
694 | }
|
---|
695 |
|
---|
696 | /* Set command pointer to point to this label. (Does not handle null label.) */
|
---|
697 | static sed_cmd_t *branch_to(char *label)
|
---|
698 | {
|
---|
699 | sed_cmd_t *sed_cmd;
|
---|
700 |
|
---|
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;
|
---|
704 | }
|
---|
705 | }
|
---|
706 | bb_error_msg_and_die("can't find label for jump to '%s'", label);
|
---|
707 | }
|
---|
708 |
|
---|
709 | static void append(char *s)
|
---|
710 | {
|
---|
711 | llist_add_to_end(&G.append_head, xstrdup(s));
|
---|
712 | }
|
---|
713 |
|
---|
714 | static void flush_append(void)
|
---|
715 | {
|
---|
716 | char *data;
|
---|
717 |
|
---|
718 | /* Output appended lines. */
|
---|
719 | while ((data = (char *)llist_pop(&G.append_head))) {
|
---|
720 | fprintf(G.nonstdout, "%s\n", data);
|
---|
721 | free(data);
|
---|
722 | }
|
---|
723 | }
|
---|
724 |
|
---|
725 | static void add_input_file(FILE *file)
|
---|
726 | {
|
---|
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;
|
---|
730 | }
|
---|
731 |
|
---|
732 | /* Get next line of input from G.input_file_list, flushing append buffer and
|
---|
733 | * noting if we ran out of files without a newline on the last line we read.
|
---|
734 | */
|
---|
735 | enum {
|
---|
736 | NO_EOL_CHAR = 1,
|
---|
737 | LAST_IS_NUL = 2,
|
---|
738 | };
|
---|
739 | static char *get_next_line(char *gets_char)
|
---|
740 | {
|
---|
741 | char *temp = NULL;
|
---|
742 | int len;
|
---|
743 | char gc;
|
---|
744 |
|
---|
745 | flush_append();
|
---|
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);
|
---|
756 | if (temp) {
|
---|
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 */
|
---|
771 | break;
|
---|
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++;
|
---|
784 | }
|
---|
785 | *gets_char = gc;
|
---|
786 | return temp;
|
---|
787 | }
|
---|
788 |
|
---|
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)
|
---|
804 | {
|
---|
805 | char lpc = *last_puts_char;
|
---|
806 |
|
---|
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... */
|
---|
832 | bb_error_msg_and_die(bb_msg_write_error);
|
---|
833 | }
|
---|
834 | *last_puts_char = lpc;
|
---|
835 | }
|
---|
836 |
|
---|
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;
|
---|
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;
|
---|
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;
|
---|
857 |
|
---|
858 | /* Prime the pump */
|
---|
859 | next_line = get_next_line(&next_gets_char);
|
---|
860 |
|
---|
861 | /* go through every line in each file */
|
---|
862 | again:
|
---|
863 | substituted = 0;
|
---|
864 |
|
---|
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;
|
---|
869 |
|
---|
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++;
|
---|
874 | restart:
|
---|
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;
|
---|
878 |
|
---|
879 | old_matched = sed_cmd->in_match;
|
---|
880 |
|
---|
881 | /* Determine if this command matches this line: */
|
---|
882 |
|
---|
883 | /* Are we continuing a previous multi-line match? */
|
---|
884 | sed_cmd->in_match = sed_cmd->in_match
|
---|
885 | /* Or is no range necessary? */
|
---|
886 | || (!sed_cmd->beg_line && !sed_cmd->end_line
|
---|
887 | && !sed_cmd->beg_match && !sed_cmd->end_match)
|
---|
888 | /* Or did we match the start of a numerical range? */
|
---|
889 | || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
|
---|
890 | /* Or does this line match our begin address regex? */
|
---|
891 | || (beg_match(sed_cmd, pattern_space))
|
---|
892 | /* Or did we match last line of input? */
|
---|
893 | || (sed_cmd->beg_line == -1 && next_line == NULL);
|
---|
894 |
|
---|
895 | /* Snapshot the value */
|
---|
896 |
|
---|
897 | matched = sed_cmd->in_match;
|
---|
898 |
|
---|
899 | /* Is this line the end of the current match? */
|
---|
900 |
|
---|
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 | }
|
---|
925 | }
|
---|
926 | continue;
|
---|
927 | }
|
---|
928 |
|
---|
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;
|
---|
934 | }
|
---|
935 |
|
---|
936 | /* actual sedding */
|
---|
937 | switch (sed_cmd->cmd) {
|
---|
938 |
|
---|
939 | /* Print line number */
|
---|
940 | case '=':
|
---|
941 | fprintf(G.nonstdout, "%d\n", linenum);
|
---|
942 | break;
|
---|
943 |
|
---|
944 | /* Write the current pattern space up to the first newline */
|
---|
945 | case 'P':
|
---|
946 | {
|
---|
947 | char *tmp = strchr(pattern_space, '\n');
|
---|
948 |
|
---|
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 | }
|
---|
958 |
|
---|
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');
|
---|
971 |
|
---|
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;
|
---|
982 |
|
---|
983 | /* Substitute with regex */
|
---|
984 | case 's':
|
---|
985 | if (!do_subst_command(sed_cmd, &pattern_space))
|
---|
986 | break;
|
---|
987 | substituted |= 1;
|
---|
988 |
|
---|
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;
|
---|
998 |
|
---|
999 | /* Append line to linked list to be printed later */
|
---|
1000 | case 'a':
|
---|
1001 | append(sed_cmd->string);
|
---|
1002 | break;
|
---|
1003 |
|
---|
1004 | /* Insert text before this line */
|
---|
1005 | case 'i':
|
---|
1006 | sed_puts(sed_cmd->string, '\n');
|
---|
1007 | break;
|
---|
1008 |
|
---|
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;
|
---|
1015 |
|
---|
1016 | /* Read file, append contents to output */
|
---|
1017 | case 'r':
|
---|
1018 | {
|
---|
1019 | FILE *rfile;
|
---|
1020 |
|
---|
1021 | rfile = fopen(sed_cmd->string, "r");
|
---|
1022 | if (rfile) {
|
---|
1023 | char *line;
|
---|
1024 |
|
---|
1025 | while ((line = xmalloc_getline(rfile))
|
---|
1026 | != NULL)
|
---|
1027 | append(line);
|
---|
1028 | xprint_and_close_file(rfile);
|
---|
1029 | }
|
---|
1030 |
|
---|
1031 | break;
|
---|
1032 | }
|
---|
1033 |
|
---|
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;
|
---|
1040 |
|
---|
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 */
|
---|
1054 |
|
---|
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;
|
---|
1061 |
|
---|
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 | }
|
---|
1083 |
|
---|
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;
|
---|
1102 |
|
---|
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;
|
---|
1108 | }
|
---|
1109 | }
|
---|
1110 | }
|
---|
1111 |
|
---|
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;
|
---|
1122 |
|
---|
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';
|
---|
1135 |
|
---|
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;
|
---|
1146 |
|
---|
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);
|
---|
1153 |
|
---|
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);
|
---|
1159 |
|
---|
1160 | break;
|
---|
1161 | }
|
---|
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 | }
|
---|
1171 | }
|
---|
1172 | }
|
---|
1173 |
|
---|
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);
|
---|
1182 |
|
---|
1183 | /* Delete and such jump here. */
|
---|
1184 | discard_line:
|
---|
1185 | flush_append();
|
---|
1186 | free(pattern_space);
|
---|
1187 |
|
---|
1188 | goto again;
|
---|
1189 | }
|
---|
1190 |
|
---|
1191 | /* It is possible to have a command line argument with embedded
|
---|
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 | */
|
---|
1196 |
|
---|
1197 | static void add_cmd_block(char *cmdstr)
|
---|
1198 | {
|
---|
1199 | char *sv, *eol;
|
---|
1200 |
|
---|
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);
|
---|
1224 | }
|
---|
1225 |
|
---|
1226 | int sed_main(int argc, char **argv);
|
---|
1227 | int sed_main(int argc, char **argv)
|
---|
1228 | {
|
---|
1229 | enum {
|
---|
1230 | OPT_in_place = 1 << 0,
|
---|
1231 | };
|
---|
1232 | unsigned opt;
|
---|
1233 | llist_t *opt_e, *opt_f;
|
---|
1234 | int status = EXIT_SUCCESS;
|
---|
1235 |
|
---|
1236 | INIT_G();
|
---|
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. */
|
---|
1242 | if (argc == 2 && !strcmp(argv[1], "--version")) {
|
---|
1243 | puts("This is not GNU sed version 4.0");
|
---|
1244 | return 0;
|
---|
1245 | }
|
---|
1246 |
|
---|
1247 | /* do normal option parsing */
|
---|
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);
|
---|
1272 | }
|
---|
1273 | fclose(cmdfile);
|
---|
1274 | opt_f = opt_f->link;
|
---|
1275 | /* we leak opt_f here... */
|
---|
1276 | }
|
---|
1277 | /* if we didn't get a pattern from -e or -f, use argv[0] */
|
---|
1278 | if (!(opt & 0x18)) {
|
---|
1279 | if (!argc)
|
---|
1280 | bb_show_usage();
|
---|
1281 | add_cmd_block(*argv++);
|
---|
1282 | argc--;
|
---|
1283 | }
|
---|
1284 | /* Flush any unfinished commands. */
|
---|
1285 | add_cmd("");
|
---|
1286 |
|
---|
1287 | /* By default, we write to stdout */
|
---|
1288 | G.nonstdout = stdout;
|
---|
1289 |
|
---|
1290 | /* argv[0..(argc-1)] should be names of file to process. If no
|
---|
1291 | * files were specified or '-' was specified, take input from stdin.
|
---|
1292 | * Otherwise, we process all the files specified. */
|
---|
1293 | if (argv[0] == NULL) {
|
---|
1294 | if (opt & OPT_in_place)
|
---|
1295 | bb_error_msg_and_die(bb_msg_requires_arg, "-i");
|
---|
1296 | add_input_file(stdin);
|
---|
1297 | process_files();
|
---|
1298 | } else {
|
---|
1299 | int i;
|
---|
1300 | FILE *file;
|
---|
1301 |
|
---|
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)) {
|
---|
1307 | add_input_file(stdin);
|
---|
1308 | process_files();
|
---|
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 | }
|
---|
1320 |
|
---|
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");
|
---|
1326 |
|
---|
1327 | /* Set permissions of output file */
|
---|
1328 |
|
---|
1329 | fstat(fileno(file), &statbuf);
|
---|
1330 | fchmod(nonstdoutfd, statbuf.st_mode);
|
---|
1331 | add_input_file(file);
|
---|
1332 | process_files();
|
---|
1333 | fclose(G.nonstdout);
|
---|
1334 |
|
---|
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;
|
---|
1341 | }
|
---|
1342 | if (G.input_file_count > G.current_input_file)
|
---|
1343 | process_files();
|
---|
1344 | }
|
---|
1345 |
|
---|
1346 | return status;
|
---|
1347 | }
|
---|