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>
52 /* Input-file-with-indexable-lines abstract type */
54 static size_t i_size; /* size of the input file */
55 static char *i_womp; /* plan a buffer for entire file */
56 static char **i_ptr; /* pointers to lines in i_womp */
57 static char empty_line[] = { '\0' };
59 static int tifd = -1; /* plan b virtual string array */
60 static char *tibuf[2]; /* plan b buffers */
61 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
62 static LINENUM lines_per_buf; /* how many lines per buffer */
63 static int tireclen; /* length of records in tmp file */
65 static bool rev_in_string(const char *);
66 static bool reallocate_lines(size_t *);
68 /* returns false if insufficient memory */
69 static bool plan_a(const char *);
71 static void plan_b(const char *);
73 /* New patch--prepare to edit another file. */
82 munmap(i_womp, i_size);
87 using_plan_a = true; /* maybe the next one is smaller */
92 tibuf[0] = tibuf[1] = NULL;
93 tiline[0] = tiline[1] = -1;
98 /* Construct the line index, somehow or other. */
101 scan_input(const char *filename)
103 if (!plan_a(filename))
106 say("Patching file %s using Plan %s...\n", filename,
107 (using_plan_a ? "A" : "B"));
112 reallocate_lines(size_t *lines_allocated)
117 new_size = *lines_allocated * 3 / 2;
118 p = realloc(i_ptr, (new_size + 2) * sizeof(char *));
119 if (p == NULL) { /* shucks, it was a near thing */
120 munmap(i_womp, i_size);
124 *lines_allocated = 0;
127 *lines_allocated = new_size;
132 /* Try keeping everything in memory. */
135 plan_a(const char *filename)
137 int ifd, statfailed, devnull, pstat;
138 char *p, *s, lbuf[INITLINELEN];
139 struct stat filestat;
142 size_t iline, lines_allocated;
144 char *argp[4] = {NULL};
151 if (filename == NULL || *filename == '\0')
154 statfailed = stat(filename, &filestat);
155 if (statfailed && ok_to_create_file) {
157 say("(Creating file %s...)\n", filename);
160 * in check_patch case, we still display `Creating file' even
161 * though we're not. The rule is that -C should be as similar
162 * to normal patch behavior as possible
166 makedirs(filename, true);
167 close(creat(filename, 0666));
168 statfailed = stat(filename, &filestat);
170 if (statfailed && check_only)
171 fatal("%s not found, -C mode, can't probe further\n", filename);
172 /* For nonexistent or read-only files, look for RCS versions. */
175 /* No one can write to it. */
176 (filestat.st_mode & 0222) == 0 ||
177 /* I can't write to it. */
178 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
179 char *filebase, *filedir;
181 char *tmp_filename1, *tmp_filename2;
183 tmp_filename1 = strdup(filename);
184 tmp_filename2 = strdup(filename);
185 if (tmp_filename1 == NULL || tmp_filename2 == NULL)
186 fatal("strdupping filename");
188 filebase = basename(tmp_filename1);
189 filedir = dirname(tmp_filename2);
191 #define try(f, a1, a2, a3) \
192 (snprintf(lbuf, sizeof(lbuf), f, a1, a2, a3), stat(lbuf, &cstat) == 0)
195 * else we can't write to it but it's not under a version
196 * control system, so just proceed.
198 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
199 try("%s/RCS/%s%s", filedir, filebase, "") ||
200 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
202 if ((filestat.st_mode & 0222) != 0)
203 /* The owner can write to it. */
204 fatal("file %s seems to be locked "
205 "by somebody else under RCS\n",
208 * It might be checked out unlocked. See if
209 * it's safe to check out the default version
213 say("Comparing file %s to default "
214 "RCS version...\n", filename);
216 switch (pid = fork()) {
218 fatal("can't fork: %s\n",
221 devnull = open("/dev/null", O_RDONLY);
223 fatal("can't open /dev/null: %s",
226 (void)dup2(devnull, STDOUT_FILENO);
227 argp[0] = strdup(RCSDIFF);
228 argp[1] = strdup(filename);
229 execv(RCSDIFF, argp);
232 pid = waitpid(pid, &pstat, 0);
233 if (pid == -1 || WEXITSTATUS(pstat) != 0) {
234 fatal("can't check out file %s: "
235 "differs from default RCS version\n",
241 say("Checking out file %s from RCS...\n",
244 switch (pid = fork()) {
246 fatal("can't fork: %s\n", strerror(errno));
248 argp[0] = strdup(CHECKOUT);
249 argp[1] = strdup("-l");
250 argp[2] = strdup(filename);
251 execv(CHECKOUT, argp);
254 pid = waitpid(pid, &pstat, 0);
255 if (pid == -1 || WEXITSTATUS(pstat) != 0 ||
256 stat(filename, &filestat)) {
257 fatal("can't check out file %s from RCS\n",
260 } else if (statfailed) {
261 fatal("can't find %s\n", filename);
267 filemode = filestat.st_mode;
268 if (!S_ISREG(filemode))
269 fatal("%s is not a normal file--can't patch\n", filename);
270 if ((uint64_t)filestat.st_size > SIZE_MAX) {
271 say("block too large to mmap\n");
274 i_size = (size_t)filestat.st_size;
276 set_hunkmax(); /* make sure dynamic arrays are allocated */
278 return false; /* force plan b because plan a bombed */
280 if ((ifd = open(filename, O_RDONLY)) < 0)
281 pfatal("can't open file %s", filename);
284 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
285 if (i_womp == MAP_FAILED) {
286 perror("mmap failed");
297 madvise(i_womp, i_size, MADV_SEQUENTIAL);
299 /* estimate the number of lines */
300 lines_allocated = i_size / 25;
301 if (lines_allocated < 100)
302 lines_allocated = 100;
304 if (!reallocate_lines(&lines_allocated))
307 /* now scan the buffer and build pointer array */
309 i_ptr[iline] = i_womp;
310 /* test for NUL too, to maintain the behavior of the original code */
311 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
313 if (iline == lines_allocated) {
314 if (!reallocate_lines(&lines_allocated))
317 /* these are NOT NUL terminated */
318 i_ptr[++iline] = s + 1;
321 /* if the last line contains no EOL, append one */
322 if (i_size > 0 && i_womp[i_size - 1] != '\n') {
323 last_line_missing_eol = true;
325 sz = s - i_ptr[iline];
330 munmap(i_womp, i_size);
335 memcpy(p, i_ptr[iline], sz);
338 /* count the extra line and make it point to some valid mem */
339 i_ptr[++iline] = empty_line;
341 last_line_missing_eol = false;
343 input_lines = iline - 1;
345 /* now check for revision, if any */
347 if (revision != NULL) {
348 if (!rev_in_string(i_womp)) {
351 say("Warning: this file doesn't appear "
352 "to be the %s version--patching anyway.\n",
355 fatal("this file doesn't appear to be the "
356 "%s version--aborting.\n",
359 ask("This file doesn't appear to be the "
360 "%s version--patch anyway? [n] ",
366 say("Good. This file appears to be the %s version.\n",
369 return true; /* plan a will work */
372 /* Keep (virtually) nothing in memory. */
375 plan_b(const char *filename)
378 size_t i = 0, j, maxlen = 1;
380 bool found_revision = (revision == NULL);
382 using_plan_a = false;
383 if ((ifp = fopen(filename, "r")) == NULL)
384 pfatal("can't open file %s", filename);
386 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
387 pfatal("can't open file %s", TMPINNAME);
388 while (fgets(buf, buf_size, ifp) != NULL) {
389 if (revision != NULL && !found_revision && rev_in_string(buf))
390 found_revision = true;
391 if ((i = strlen(buf)) > maxlen)
392 maxlen = i; /* find longest line */
394 last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
395 if (last_line_missing_eol && maxlen == i)
398 if (revision != NULL) {
399 if (!found_revision) {
402 say("Warning: this file doesn't appear "
403 "to be the %s version--patching anyway.\n",
406 fatal("this file doesn't appear to be the "
407 "%s version--aborting.\n",
410 ask("This file doesn't appear to be the %s "
411 "version--patch anyway? [n] ",
417 say("Good. This file appears to be the %s version.\n",
420 fseek(ifp, 0L, SEEK_SET); /* rewind file */
421 lines_per_buf = BUFFERSIZE / maxlen;
423 tibuf[0] = malloc(BUFFERSIZE + 1);
424 if (tibuf[0] == NULL)
425 fatal("out of memory\n");
426 tibuf[1] = malloc(BUFFERSIZE + 1);
427 if (tibuf[1] == NULL)
428 fatal("out of memory\n");
430 p = tibuf[0] + maxlen * (i % lines_per_buf);
431 if (i % lines_per_buf == 0) /* new block */
432 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
433 pfatal("can't write temp file");
434 if (fgets(p, maxlen + 1, ifp) == NULL) {
436 if (i % lines_per_buf != 0)
437 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
438 pfatal("can't write temp file");
442 /* These are '\n' terminated strings, so no need to add a NUL */
443 if (j == 0 || p[j - 1] != '\n')
448 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
449 pfatal("can't reopen file %s", TMPINNAME);
453 * Fetch a line from the input file, \n terminated, not necessarily \0.
456 ifetch(LINENUM line, int whichbuf)
458 if (line < 1 || line > input_lines) {
459 if (warn_on_invalid_line) {
460 say("No such line %ld in input file, ignoring\n", line);
461 warn_on_invalid_line = false;
468 LINENUM offline = line % lines_per_buf;
469 LINENUM baseline = line - offline;
471 if (tiline[0] == baseline)
473 else if (tiline[1] == baseline)
476 tiline[whichbuf] = baseline;
478 if (lseek(tifd, (off_t) (baseline / lines_per_buf *
479 BUFFERSIZE), SEEK_SET) < 0)
480 pfatal("cannot seek in the temporary input file");
482 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
483 pfatal("error reading tmp file %s", TMPINNAME);
485 return tibuf[whichbuf] + (tireclen * offline);
490 * True if the string argument contains the revision number we want.
493 rev_in_string(const char *string)
498 if (revision == NULL)
500 patlen = strlen(revision);
501 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen]))
503 for (s = string; *s; s++) {
504 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
505 isspace((unsigned char)s[patlen + 1])) {