annotate toys/posix/patch.c @ 1060:c2663b7eca78 draft

Adjust patch to use dlist_pop()
author Rob Landley <rob@landley.net>
date Mon, 09 Sep 2013 05:26:52 -0500
parents 98c396477e0b
children ccf4193167c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* patch.c - Apply a "universal" diff.
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2 *
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3 * Copyright 2007 Rob Landley <rob@landley.net>
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4 *
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5 * see http://opengroup.org/onlinepubs/9699919799/utilities/patch.html
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6 * (But only does -u, because who still cares about "ed"?)
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7 *
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8 * TODO:
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9 * -b backup
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10 * -l treat all whitespace as a single space
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11 * -N ignore already applied
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12 * -d chdir first
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13 * -D define wrap #ifdef and #ifndef around changes
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14 * -o outfile output here instead of in place
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15 * -r rejectfile write rejected hunks to this file
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16 *
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17 * -E remove empty files --remove-empty-files
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18 * -f force (no questions asked)
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19 * -F fuzz (number, default 2)
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20 * [file] which file to patch
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21
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22 USE_PATCH(NEWTOY(patch, USE_TOYBOX_DEBUG("x")"ulp#i:R", TOYFLAG_USR|TOYFLAG_BIN))
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23
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24 config PATCH
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25 bool "patch"
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26 default y
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27 help
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28 usage: patch [-i file] [-p depth] [-Ru]
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29
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30 Apply a unified diff to one or more files.
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32 -i Input file (defaults=stdin)
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33 -l Loose match (ignore whitespace)
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34 -p Number of '/' to strip from start of file paths (default=all)
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35 -R Reverse patch.
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36 -u Ignored (only handles "unified" diffs)
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38 This version of patch only handles unified diffs, and only modifies
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39 a file when all all hunks to that file apply. Patch prints failed
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40 hunks to stderr, and exits with nonzero status if any hunks fail.
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42 A file compared against /dev/null (or with a date <= the epoch) is
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43 created/deleted as appropriate.
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44 */
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45
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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46 #define FOR_patch
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47 #include "toys.h"
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48
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49 GLOBALS(
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50 char *infile;
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51 long prefix;
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53 struct double_list *current_hunk;
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54 long oldline, oldlen, newline, newlen;
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55 long linenum;
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56 int context, state, filein, fileout, filepatch, hunknum;
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57 char *tempname;
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58 )
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59
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60 // Dispose of a line of input, either by writing it out or discarding it.
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61
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62 // state < 2: just free
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63 // state = 2: write whole line to stderr
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64 // state = 3: write whole line to fileout
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65 // state > 3: write line+1 to fileout when *line != state
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66
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67 #define PATCH_DEBUG (CFG_TOYBOX_DEBUG && (toys.optflags & 32))
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68
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69 static void do_line(void *data)
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70 {
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71 struct double_list *dlist = (struct double_list *)data;
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73 if (TT.state>1 && *dlist->data != TT.state) {
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74 char *s = dlist->data+(TT.state>3 ? 1 : 0);
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75 int i = TT.state == 2 ? 2 : TT.fileout;
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77 xwrite(i, s, strlen(s));
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78 xwrite(i, "\n", 1);
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79 }
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81 if (PATCH_DEBUG) fprintf(stderr, "DO %d: %s\n", TT.state, dlist->data);
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83 free(dlist->data);
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84 free(data);
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85 }
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86
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87 static void finish_oldfile(void)
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88 {
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89 if (TT.tempname) replace_tempfile(TT.filein, TT.fileout, &TT.tempname);
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90 TT.fileout = TT.filein = -1;
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91 }
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92
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93 static void fail_hunk(void)
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94 {
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95 if (!TT.current_hunk) return;
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96 TT.current_hunk->prev->next = 0;
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98 fprintf(stderr, "Hunk %d FAILED %ld/%ld.\n",
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99 TT.hunknum, TT.oldline, TT.newline);
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100 toys.exitval = 1;
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101
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102 // If we got to this point, we've seeked to the end. Discard changes to
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103 // this file and advance to next file.
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105 TT.state = 2;
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106 llist_traverse(TT.current_hunk, do_line);
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107 TT.current_hunk = NULL;
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108 delete_tempfile(TT.filein, TT.fileout, &TT.tempname);
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109 TT.state = 0;
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110 }
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111
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112 // Compare ignoring whitespace. Just returns
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113 static int loosecmp(char *aa, char *bb)
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114 {
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115 int a = 0, b = 0;
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116
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117 for (;;) {
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118 while (isspace(aa[a])) a++;
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119 while (isspace(bb[b])) b++;
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120 if (aa[a] != bb[b]) return 1;
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121 if (!aa[a]) return 0;
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122 a++, b++;
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123 }
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124 }
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125
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126 // Given a hunk of a unified diff, make the appropriate change to the file.
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127 // This does not use the location information, but instead treats a hunk
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128 // as a sort of regex. Copies data from input to output until it finds
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129 // the change to be made, then outputs the changed data and returns.
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130 // (Finding EOF first is an error.) This is a single pass operation, so
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131 // multiple hunks must occur in order in the file.
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132
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133 static int apply_one_hunk(void)
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134 {
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135 struct double_list *plist, *buf = NULL, *check;
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136 int matcheof = 0, reverse = toys.optflags & FLAG_R, backwarn = 0;
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137 int (*lcmp)(char *aa, char *bb);
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138
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139 lcmp = (toys.optflags & FLAG_l) ? (void *)loosecmp : (void *)strcmp;
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140
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141 // Break doubly linked list so we can use singly linked traversal function.
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142 TT.current_hunk->prev->next = NULL;
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143
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144 // Match EOF if there aren't as many ending context lines as beginning
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145 for (plist = TT.current_hunk; plist; plist = plist->next) {
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146 if (plist->data[0]==' ') matcheof++;
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147 else matcheof = 0;
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148 if (PATCH_DEBUG) fprintf(stderr, "HUNK:%s\n", plist->data);
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149 }
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150 matcheof = matcheof < TT.context;
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151
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152 if (PATCH_DEBUG) fprintf(stderr,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
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153
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154 // Loop through input data searching for this hunk. Match all context
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155 // lines and all lines to be removed until we've found the end of a
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156 // complete hunk.
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157 plist = TT.current_hunk;
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158 buf = NULL;
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159 if (TT.context) for (;;) {
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160 char *data = get_line(TT.filein);
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161
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162 TT.linenum++;
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163
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164 // Figure out which line of hunk to compare with next. (Skip lines
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165 // of the hunk we'd be adding.)
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166 while (plist && *plist->data == "+-"[reverse]) {
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167 if (data && !lcmp(data, plist->data+1)) {
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168 if (!backwarn) backwarn = TT.linenum;
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169 }
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170 plist = plist->next;
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171 }
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172
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173 // Is this EOF?
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174 if (!data) {
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175 if (PATCH_DEBUG) fprintf(stderr, "INEOF\n");
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176
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177 // Does this hunk need to match EOF?
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178 if (!plist && matcheof) break;
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179
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180 if (backwarn)
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181 fprintf(stderr, "Possibly reversed hunk %d at %ld\n",
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182 TT.hunknum, TT.linenum);
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183
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184 // File ended before we found a place for this hunk.
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185 fail_hunk();
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186 goto done;
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187 } else if (PATCH_DEBUG) fprintf(stderr, "IN: %s\n", data);
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188 check = dlist_add(&buf, data);
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189
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190 // Compare this line with next expected line of hunk.
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191
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192 // A match can fail because the next line doesn't match, or because
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193 // we hit the end of a hunk that needed EOF, and this isn't EOF.
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194
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195 // If match failed, flush first line of buffered data and
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196 // recheck buffered data for a new match until we find one or run
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197 // out of buffer.
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198
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199 for (;;) {
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200 if (!plist || lcmp(check->data, plist->data+1)) {
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201 // Match failed. Write out first line of buffered data and
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202 // recheck remaining buffered data for a new match.
376
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203
694
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204 if (PATCH_DEBUG) fprintf(stderr, "NOT: %s\n", plist->data);
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205
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206 TT.state = 3;
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207 do_line(check = dlist_pop(&buf));
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208 plist = TT.current_hunk;
315
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209
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210 // If we've reached the end of the buffer without confirming a
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211 // match, read more lines.
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212 if (!buf) break;
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213 check = buf;
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214 } else {
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215 if (PATCH_DEBUG) fprintf(stderr, "MAYBE: %s\n", plist->data);
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216 // This line matches. Advance plist, detect successful match.
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217 plist = plist->next;
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218 if (!plist && !matcheof) goto out;
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219 check = check->next;
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220 if (check == buf) break;
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221 }
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222 }
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223 }
315
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224 out:
694
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225 // We have a match. Emit changed data.
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226 TT.state = "-+"[reverse];
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227 llist_traverse(TT.current_hunk, do_line);
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228 TT.current_hunk = NULL;
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229 TT.state = 1;
219
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230 done:
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231 if (buf) {
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232 buf->prev->next = NULL;
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233 llist_traverse(buf, do_line);
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234 }
348
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235
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236 return TT.state;
209
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237 }
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238
376
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239 // Read a patch file and find hunks, opening/creating/deleting files.
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240 // Call apply_one_hunk() on each hunk.
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241
209
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242 // state 0: Not in a hunk, look for +++.
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243 // state 1: Found +++ file indicator, look for @@
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244 // state 2: In hunk: counting initial context lines
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245 // state 3: In hunk: getting body
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246
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247 void patch_main(void)
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248 {
694
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249 int reverse = toys.optflags&FLAG_R, state = 0, patchlinenum = 0,
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250 strip = 0;
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251 char *oldname = NULL, *newname = NULL;
348
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252
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253 if (TT.infile) TT.filepatch = xopen(TT.infile, O_RDONLY);
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254 TT.filein = TT.fileout = -1;
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255
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256 // Loop through the lines in the patch
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257 for (;;) {
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258 char *patchline;
209
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259
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260 patchline = get_line(TT.filepatch);
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261 if (!patchline) break;
209
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262
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263 // Other versions of patch accept damaged patches,
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264 // so we need to also.
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265 if (strip || !patchlinenum++) {
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266 int len = strlen(patchline);
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267 if (patchline[len-1] == '\r') {
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268 if (!strip) fprintf(stderr, "Removing DOS newlines\n");
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269 strip = 1;
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270 patchline[len-1]=0;
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271 }
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272 }
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273 if (!*patchline) {
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274 free(patchline);
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275 patchline = xstrdup(" ");
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276 }
351
add8b512f41a Another patch corner case.
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277
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278 // Are we assembling a hunk?
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279 if (state >= 2) {
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280 if (*patchline==' ' || *patchline=='+' || *patchline=='-') {
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281 dlist_add(&TT.current_hunk, patchline);
209
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282
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283 if (*patchline != '+') TT.oldlen--;
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284 if (*patchline != '-') TT.newlen--;
219
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285
694
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286 // Context line?
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287 if (*patchline==' ' && state==2) TT.context++;
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288 else state=3;
209
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289
694
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290 // If we've consumed all expected hunk lines, apply the hunk.
348
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291
694
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292 if (!TT.oldlen && !TT.newlen) state = apply_one_hunk();
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293 continue;
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294 }
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295 fail_hunk();
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296 state = 0;
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297 continue;
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298 }
209
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299
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300 // Open a new file?
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301 if (!strncmp("--- ", patchline, 4) || !strncmp("+++ ", patchline, 4)) {
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302 char *s, **name = &oldname;
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303 int i;
325
5d0fbdb2fc86 The epoch can also show up as 1970-01-01 (depending on timezone), so treat any year >0 and <= 1970 as meaning "file does not exist".
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304
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305 if (*patchline == '+') {
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306 name = &newname;
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307 state = 1;
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308 }
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309
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310 free(*name);
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311 finish_oldfile();
209
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312
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313 // Trim date from end of filename (if any). We don't care.
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314 for (s = patchline+4; *s && *s!='\t'; s++)
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315 if (*s=='\\' && s[1]) s++;
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316 i = atoi(s);
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317 if (i>1900 && i<=1970) *name = xstrdup("/dev/null");
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318 else {
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319 *s = 0;
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320 *name = xstrdup(patchline+4);
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321 }
335
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322
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323 // We defer actually opening the file because svn produces broken
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324 // patches that don't signal they want to create a new file the
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325 // way the patch man page says, so you have to read the first hunk
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326 // and _guess_.
348
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327
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328 // Start a new hunk? Usually @@ -oldline,oldlen +newline,newlen @@
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329 // but a missing ,value means the value is 1.
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330 } else if (state == 1 && !strncmp("@@ -", patchline, 4)) {
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331 int i;
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332 char *s = patchline+4;
348
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333
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334 // Read oldline[,oldlen] +newline[,newlen]
377
15ca7e49b6ff The @@ -1,2 +3,4 @@ lines treat ,1 as implied, so the format isn't regular.
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335
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336 TT.oldlen = TT.newlen = 1;
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337 TT.oldline = strtol(s, &s, 10);
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338 if (*s == ',') TT.oldlen=strtol(s+1, &s, 10);
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339 TT.newline = strtol(s+2, &s, 10);
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340 if (*s == ',') TT.newlen = strtol(s+1, &s, 10);
348
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341
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342 TT.context = 0;
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343 state = 2;
348
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344
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345 // If this is the first hunk, open the file.
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346 if (TT.filein == -1) {
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347 int oldsum, newsum, del = 0;
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348 char *name;
348
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349
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350 oldsum = TT.oldline + TT.oldlen;
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351 newsum = TT.newline + TT.newlen;
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352
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353 name = reverse ? oldname : newname;
335
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354
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355 // We're deleting oldname if new file is /dev/null (before -p)
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356 // or if new hunk is empty (zero context) after patching
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357 if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum))
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358 {
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359 name = reverse ? newname : oldname;
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360 del++;
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361 }
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362
694
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363 // handle -p path truncation.
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364 for (i = 0, s = name; *s;) {
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365 if ((toys.optflags & FLAG_p) && TT.prefix == i) break;
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366 if (*s++ != '/') continue;
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367 while (*s == '/') s++;
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368 name = s;
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369 i++;
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370 }
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371
694
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372 if (del) {
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373 printf("removing %s\n", name);
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374 xunlink(name);
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375 state = 0;
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376 // If we've got a file to open, do so.
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377 } else if (!(toys.optflags & FLAG_p) || i <= TT.prefix) {
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378 // If the old file was null, we're creating a new one.
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379 if ((!strcmp(oldname, "/dev/null") || !oldsum) && access(name, F_OK))
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380 {
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381 printf("creating %s\n", name);
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382 s = strrchr(name, '/');
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383 if (s) {
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parents: 690
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384 *s = 0;
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parents: 690
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385 xmkpath(name, -1);
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parents: 690
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386 *s = '/';
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parents: 690
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387 }
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parents: 690
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388 TT.filein = xcreate(name, O_CREAT|O_EXCL|O_RDWR, 0666);
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parents: 690
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389 } else {
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 690
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390 printf("patching %s\n", name);
827
98c396477e0b Fix a bug in patch I fixed back in 2010 but forgot to apply here.
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parents: 694
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391 TT.filein = xopen(name, O_RDONLY);
694
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parents: 690
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392 }
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parents: 690
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393 TT.fileout = copy_tempfile(TT.filein, name, &TT.tempname);
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parents: 690
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394 TT.linenum = 0;
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parents: 690
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395 TT.hunknum = 0;
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parents: 690
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396 }
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parents: 690
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397 }
209
9a0d4e8a9c61 Patch command.
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parents:
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398
694
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parents: 690
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399 TT.hunknum++;
209
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400
694
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parents: 690
diff changeset
401 continue;
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parents: 690
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402 }
209
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parents:
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403
694
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parents: 690
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404 // If we didn't continue above, discard this line.
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parents: 690
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405 free(patchline);
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parents: 690
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406 }
209
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parents:
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407
694
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parents: 690
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408 finish_oldfile();
219
cfa11e043e2b Fix patch to use @@ values and match EOF when fewer trailing than starting
Rob Landley <rob@landley.net>
parents: 216
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409
694
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parents: 690
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410 if (CFG_TOYBOX_FREE) {
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Rob Landley <rob@landley.net>
parents: 690
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411 close(TT.filepatch);
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parents: 690
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412 free(oldname);
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Rob Landley <rob@landley.net>
parents: 690
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413 free(newname);
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parents: 690
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414 }
209
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415 }