2 * Copyright 1986, Larry Wall
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following condition is met:
6 * 1. Redistributions of source code must retain the above copyright notice,
7 * this condition and the following disclaimer.
9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
21 * patch - a program to apply diffs to original files
23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
26 * $OpenBSD: inp.c,v 1.36 2012/04/10 14:46:34 ajacoutot Exp $
30 #include <sys/types.h>
54 /* Input-file-with-indexable-lines abstract type */
56 static size_t i_size; /* size of the input file */
57 static char *i_womp; /* plan a buffer for entire file */
58 static char **i_ptr; /* pointers to lines in i_womp */
59 static char empty_line[] = { '\0' };
61 static int tifd = -1; /* plan b virtual string array */
62 static char *tibuf[2]; /* plan b buffers */
63 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
64 static size_t lines_per_buf; /* how many lines per buffer */
65 static size_t tibuflen; /* plan b buffer length */
66 static size_t tireclen; /* length of records in tmp file */
68 static bool rev_in_string(const char *);
69 static bool reallocate_lines(size_t *);
71 /* returns false if insufficient memory */
72 static bool plan_a(const char *);
74 static void plan_b(const char *);
76 /* New patch--prepare to edit another file. */
85 munmap(i_womp, i_size);
90 using_plan_a = true; /* maybe the next one is smaller */
95 tibuf[0] = tibuf[1] = NULL;
96 tiline[0] = tiline[1] = -1;
101 /* Construct the line index, somehow or other. */
104 scan_input(const char *filename)
106 if (!plan_a(filename))
109 say("Patching file %s using Plan %s...\n", filename,
110 (using_plan_a ? "A" : "B"));
115 reallocate_lines(size_t *lines_allocated)
120 new_size = *lines_allocated * 3 / 2;
121 p = realloc(i_ptr, (new_size + 2) * sizeof(char *));
122 if (p == NULL) { /* shucks, it was a near thing */
123 munmap(i_womp, i_size);
127 *lines_allocated = 0;
130 *lines_allocated = new_size;
135 /* Try keeping everything in memory. */
138 plan_a(const char *filename)
142 struct stat filestat;
145 size_t iline, lines_allocated;
152 if (filename == NULL || *filename == '\0')
155 statfailed = stat(filename, &filestat);
156 if (statfailed && ok_to_create_file) {
158 say("(Creating file %s...)\n", filename);
161 * in check_patch case, we still display `Creating file' even
162 * though we're not. The rule is that -C should be as similar
163 * to normal patch behavior as possible
167 makedirs(filename, true);
168 close(creat(filename, 0666));
169 statfailed = stat(filename, &filestat);
172 fatal("can't find %s\n", filename);
173 filemode = filestat.st_mode;
174 if (!S_ISREG(filemode))
175 fatal("%s is not a normal file--can't patch\n", filename);
176 if ((uint64_t)filestat.st_size > SIZE_MAX) {
177 say("block too large to mmap\n");
180 i_size = (size_t)filestat.st_size;
182 set_hunkmax(); /* make sure dynamic arrays are allocated */
184 return false; /* force plan b because plan a bombed */
186 if ((ifd = open(filename, O_RDONLY)) < 0)
187 pfatal("can't open file %s", filename);
190 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
191 if (i_womp == MAP_FAILED) {
192 perror("mmap failed");
203 madvise(i_womp, i_size, MADV_SEQUENTIAL);
205 /* estimate the number of lines */
206 lines_allocated = i_size / 25;
207 if (lines_allocated < 100)
208 lines_allocated = 100;
210 if (!reallocate_lines(&lines_allocated))
213 /* now scan the buffer and build pointer array */
215 i_ptr[iline] = i_womp;
216 /* test for NUL too, to maintain the behavior of the original code */
217 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
219 if (iline == lines_allocated) {
220 if (!reallocate_lines(&lines_allocated))
223 /* these are NOT NUL terminated */
224 i_ptr[++iline] = s + 1;
227 /* if the last line contains no EOL, append one */
228 if (i_size > 0 && i_womp[i_size - 1] != '\n') {
229 last_line_missing_eol = true;
231 sz = s - i_ptr[iline];
236 munmap(i_womp, i_size);
241 memcpy(p, i_ptr[iline], sz);
244 /* count the extra line and make it point to some valid mem */
245 i_ptr[++iline] = empty_line;
247 last_line_missing_eol = false;
249 input_lines = iline - 1;
251 /* now check for revision, if any */
253 if (revision != NULL) {
254 if (i_womp == NULL || !rev_in_string(i_womp)) {
257 say("Warning: this file doesn't appear "
258 "to be the %s version--patching anyway.\n",
261 fatal("this file doesn't appear to be the "
262 "%s version--aborting.\n",
265 ask("This file doesn't appear to be the "
266 "%s version--patch anyway? [n] ",
272 say("Good. This file appears to be the %s version.\n",
275 return true; /* plan a will work */
278 /* Keep (virtually) nothing in memory. */
281 plan_b(const char *filename)
284 size_t i = 0, j, len, maxlen = 1;
285 char *lbuf = NULL, *p;
286 bool found_revision = (revision == NULL);
288 using_plan_a = false;
289 if ((ifp = fopen(filename, "r")) == NULL)
290 pfatal("can't open file %s", filename);
292 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
293 pfatal("can't open file %s", TMPINNAME);
294 while ((p = fgetln(ifp, &len)) != NULL) {
295 if (p[len - 1] == '\n')
298 /* EOF without EOL, copy and add the NUL */
299 if ((lbuf = malloc(len + 1)) == NULL)
300 fatal("out of memory\n");
301 memcpy(lbuf, p, len);
305 last_line_missing_eol = true;
308 if (revision != NULL && !found_revision && rev_in_string(p))
309 found_revision = true;
311 maxlen = len; /* find longest line */
315 pfatal("can't read file %s", filename);
317 if (revision != NULL) {
318 if (!found_revision) {
321 say("Warning: this file doesn't appear "
322 "to be the %s version--patching anyway.\n",
325 fatal("this file doesn't appear to be the "
326 "%s version--aborting.\n",
329 ask("This file doesn't appear to be the %s "
330 "version--patch anyway? [n] ",
336 say("Good. This file appears to be the %s version.\n",
339 fseek(ifp, 0L, SEEK_SET); /* rewind file */
341 tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
342 lines_per_buf = tibuflen / maxlen;
343 tibuf[0] = malloc(tibuflen + 1);
344 if (tibuf[0] == NULL)
345 fatal("out of memory\n");
346 tibuf[1] = malloc(tibuflen + 1);
347 if (tibuf[1] == NULL)
348 fatal("out of memory\n");
350 p = tibuf[0] + maxlen * (i % lines_per_buf);
351 if (i % lines_per_buf == 0) /* new block */
352 if (write(tifd, tibuf[0], tibuflen) !=
354 pfatal("can't write temp file");
355 if (fgets(p, maxlen + 1, ifp) == NULL) {
357 if (i % lines_per_buf != 0)
358 if (write(tifd, tibuf[0], tibuflen) !=
360 pfatal("can't write temp file");
364 /* These are '\n' terminated strings, so no need to add a NUL */
365 if (j == 0 || p[j - 1] != '\n')
370 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
371 pfatal("can't reopen file %s", TMPINNAME);
375 * Fetch a line from the input file, \n terminated, not necessarily \0.
378 ifetch(LINENUM line, int whichbuf)
380 if (line < 1 || line > input_lines) {
381 if (warn_on_invalid_line) {
382 say("No such line %ld in input file, ignoring\n", line);
383 warn_on_invalid_line = false;
390 LINENUM offline = line % lines_per_buf;
391 LINENUM baseline = line - offline;
393 if (tiline[0] == baseline)
395 else if (tiline[1] == baseline)
398 tiline[whichbuf] = baseline;
400 if (lseek(tifd, (off_t) (baseline / lines_per_buf *
401 tibuflen), SEEK_SET) < 0)
402 pfatal("cannot seek in the temporary input file");
404 if (read(tifd, tibuf[whichbuf], tibuflen) !=
406 pfatal("error reading tmp file %s", TMPINNAME);
408 return tibuf[whichbuf] + (tireclen * offline);
413 * True if the string argument contains the revision number we want.
416 rev_in_string(const char *string)
421 if (revision == NULL)
423 patlen = strlen(revision);
424 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen]))
426 for (s = string; *s; s++) {
427 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
428 isspace((unsigned char)s[patlen + 1])) {