2 * $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $
3 * $DragonFly: src/usr.bin/patch/inp.c,v 1.6 2007/09/29 23:11:10 swildner Exp $
7 * patch - a program to apply diffs to original files
9 * Copyright 1986, Larry Wall
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following condition is met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this condition and the following disclaimer.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
32 #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)
138 char *p, *s, lbuf[MAXLINELEN];
139 struct stat filestat;
142 size_t iline, lines_allocated;
149 if (filename == NULL || *filename == '\0')
152 statfailed = stat(filename, &filestat);
153 if (statfailed && ok_to_create_file) {
155 say("(Creating file %s...)\n", filename);
158 * in check_patch case, we still display `Creating file' even
159 * though we're not. The rule is that -C should be as similar
160 * to normal patch behavior as possible
164 makedirs(filename, true);
165 close(creat(filename, 0666));
166 statfailed = stat(filename, &filestat);
168 if (statfailed && check_only)
169 fatal("%s not found, -C mode, can't probe further\n", filename);
170 /* For nonexistent or read-only files, look for RCS or SCCS versions. */
172 /* No one can write to it. */
173 (filestat.st_mode & 0222) == 0 ||
174 /* I can't write to it. */
175 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
176 const char *cs = NULL, *filebase, *filedir;
178 char *tmp_filename1, *tmp_filename2;
180 tmp_filename1 = strdup(filename);
181 tmp_filename2 = strdup(filename);
182 if (tmp_filename1 == NULL || tmp_filename2 == NULL)
183 fatal("strdupping filename");
184 filebase = basename(tmp_filename1);
185 filedir = dirname(tmp_filename2);
187 /* Leave room in lbuf for the diff command. */
190 #define try(f, a1, a2, a3) \
191 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
193 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
194 try("%s/RCS/%s%s", filedir, filebase, "") ||
195 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
196 snprintf(buf, buf_len, CHECKOUT, filename);
197 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
199 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
200 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) {
201 snprintf(buf, buf_len, GET, s);
202 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename);
204 } else if (statfailed)
205 fatal("can't find %s\n", filename);
211 * else we can't write to it but it's not under a version
212 * control system, so just proceed.
216 if ((filestat.st_mode & 0222) != 0)
217 /* The owner can write to it. */
218 fatal("file %s seems to be locked "
219 "by somebody else under %s\n",
222 * It might be checked out unlocked. See if
223 * it's safe to check out the default version
227 say("Comparing file %s to default "
231 fatal("can't check out file %s: "
232 "differs from default %s version\n",
236 say("Checking out file %s from %s...\n",
238 if (system(buf) || stat(filename, &filestat))
239 fatal("can't check out file %s from %s\n",
243 filemode = filestat.st_mode;
244 if (!S_ISREG(filemode))
245 fatal("%s is not a normal file--can't patch\n", filename);
246 if ((uint64_t)filestat.st_size > SIZE_MAX) {
247 say("block too large to mmap\n");
250 i_size = (size_t)filestat.st_size;
252 set_hunkmax(); /* make sure dynamic arrays are allocated */
254 return false; /* force plan b because plan a bombed */
256 if ((ifd = open(filename, O_RDONLY)) < 0)
257 pfatal("can't open file %s", filename);
259 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
260 if (i_womp == MAP_FAILED) {
261 perror("mmap failed");
269 madvise(i_womp, i_size, MADV_SEQUENTIAL);
271 /* estimate the number of lines */
272 lines_allocated = i_size / 25;
273 if (lines_allocated < 100)
274 lines_allocated = 100;
276 if (!reallocate_lines(&lines_allocated))
279 /* now scan the buffer and build pointer array */
281 i_ptr[iline] = i_womp;
282 /* test for NUL too, to maintain the behavior of the original code */
283 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
285 if (iline == lines_allocated) {
286 if (!reallocate_lines(&lines_allocated))
289 /* these are NOT NUL terminated */
290 i_ptr[++iline] = s + 1;
293 /* if the last line contains no EOL, append one */
294 if (i_size > 0 && i_womp[i_size - 1] != '\n') {
295 last_line_missing_eol = true;
297 sz = s - i_ptr[iline];
302 munmap(i_womp, i_size);
307 memcpy(p, i_ptr[iline], sz);
310 /* count the extra line and make it point to some valid mem */
311 i_ptr[++iline] = empty_line;
313 last_line_missing_eol = false;
315 input_lines = iline - 1;
317 /* now check for revision, if any */
319 if (revision != NULL) {
320 if (!rev_in_string(i_womp)) {
323 say("Warning: this file doesn't appear "
324 "to be the %s version--patching anyway.\n",
327 fatal("this file doesn't appear to be the "
328 "%s version--aborting.\n",
331 ask("This file doesn't appear to be the "
332 "%s version--patch anyway? [n] ",
338 say("Good. This file appears to be the %s version.\n",
341 return true; /* plan a will work */
344 /* Keep (virtually) nothing in memory. */
347 plan_b(const char *filename)
350 size_t i = 0, j, maxlen = 1;
352 bool found_revision = (revision == NULL);
354 using_plan_a = false;
355 if ((ifp = fopen(filename, "r")) == NULL)
356 pfatal("can't open file %s", filename);
358 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
359 pfatal("can't open file %s", TMPINNAME);
360 while (fgets(buf, buf_len, ifp) != NULL) {
361 if (revision != NULL && !found_revision && rev_in_string(buf))
362 found_revision = true;
363 if ((i = strlen(buf)) > maxlen)
364 maxlen = i; /* find longest line */
366 last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
367 if (last_line_missing_eol && maxlen == i)
370 if (revision != NULL) {
371 if (!found_revision) {
374 say("Warning: this file doesn't appear "
375 "to be the %s version--patching anyway.\n",
378 fatal("this file doesn't appear to be the "
379 "%s version--aborting.\n",
382 ask("This file doesn't appear to be the %s "
383 "version--patch anyway? [n] ",
389 say("Good. This file appears to be the %s version.\n",
392 fseek(ifp, 0L, SEEK_SET); /* rewind file */
393 lines_per_buf = BUFFERSIZE / maxlen;
395 tibuf[0] = malloc(BUFFERSIZE + 1);
396 if (tibuf[0] == NULL)
397 fatal("out of memory\n");
398 tibuf[1] = malloc(BUFFERSIZE + 1);
399 if (tibuf[1] == NULL)
400 fatal("out of memory\n");
402 p = tibuf[0] + maxlen * (i % lines_per_buf);
403 if (i % lines_per_buf == 0) /* new block */
404 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
405 pfatal("can't write temp file");
406 if (fgets(p, maxlen + 1, ifp) == NULL) {
408 if (i % lines_per_buf != 0)
409 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
410 pfatal("can't write temp file");
414 /* These are '\n' terminated strings, so no need to add a NUL */
415 if (j == 0 || p[j - 1] != '\n')
420 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
421 pfatal("can't reopen file %s", TMPINNAME);
425 * Fetch a line from the input file, \n terminated, not necessarily \0.
428 ifetch(LINENUM line, int whichbuf)
430 if (line < 1 || line > input_lines) {
431 if (warn_on_invalid_line) {
432 say("No such line %ld in input file, ignoring\n", line);
433 warn_on_invalid_line = false;
440 LINENUM offline = line % lines_per_buf;
441 LINENUM baseline = line - offline;
443 if (tiline[0] == baseline)
445 else if (tiline[1] == baseline)
448 tiline[whichbuf] = baseline;
450 if (lseek(tifd, (off_t) (baseline / lines_per_buf *
451 BUFFERSIZE), SEEK_SET) < 0)
452 pfatal("cannot seek in the temporary input file");
454 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
455 pfatal("error reading tmp file %s", TMPINNAME);
457 return tibuf[whichbuf] + (tireclen * offline);
462 * True if the string argument contains the revision number we want.
465 rev_in_string(const char *string)
470 if (revision == NULL)
472 patlen = strlen(revision);
473 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen]))
475 for (s = string; *s; s++) {
476 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
477 isspace((unsigned char)s[patlen + 1])) {