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
23 * Copyright (c) 2022 Omar Polo <op@openbsd.org>
25 * Permission to use, copy, modify, and distribute this software for any
26 * purpose with or without fee is hereby granted, provided that the above
27 * copyright notice and this permission notice appear in all copies.
29 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
30 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
31 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
32 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
33 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
34 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
35 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38 #include <sys/types.h>
39 #include <sys/queue.h>
53 #include "got_error.h"
54 #include "got_object.h"
56 #include "got_lib_delta.h"
57 #include "got_lib_object.h"
58 #include "got_lib_privsep.h"
62 static const struct got_error *
63 send_patch(const char *oldname, const char *newname, int git)
65 struct got_imsg_patch p;
67 memset(&p, 0, sizeof(p));
70 strlcpy(p.old, oldname, sizeof(p.old));
73 strlcpy(p.new, newname, sizeof(p.new));
76 if (imsg_compose(&ibuf, GOT_IMSG_PATCH, 0, 0, -1,
78 return got_error_from_errno("imsg_compose GOT_IMSG_PATCH");
82 static const struct got_error *
85 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_DONE, 0, 0, -1,
87 return got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
88 if (imsg_flush(&ibuf) == -1)
89 return got_error_from_errno("imsg_flush");
93 /* based on fetchname from usr.bin/patch/util.c */
94 static const struct got_error *
95 filename(const char *at, char **name)
103 while (isspace((unsigned char)*at))
106 /* files can be created or removed by diffing against /dev/null */
107 if (!strncmp(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
112 return got_error_from_errno("strdup");
113 if ((t = strchr(tmp, '\t')) != NULL)
115 if ((t = strchr(tmp, '\n')) != NULL)
121 return got_error_from_errno("strdup");
125 static const struct got_error *
126 find_patch(int *done, FILE *fp)
128 const struct got_error *err = NULL;
129 char *old = NULL, *new = NULL;
133 int create, rename = 0, git = 0;
135 while ((linelen = getline(&line, &linesize, fp)) != -1) {
137 * Ignore the Index name like GNU and larry' patch,
138 * we don't have to follow POSIX.
141 if (!strncmp(line, "--- ", 4)) {
143 err = filename(line+4, &old);
144 } else if (rename && !strncmp(line, "rename from ", 12)) {
146 err = filename(line+12, &old);
147 } else if (!strncmp(line, "+++ ", 4)) {
149 err = filename(line+4, &new);
150 } else if (rename && !strncmp(line, "rename to ", 10)) {
152 err = filename(line + 10, &new);
153 } else if (git && !strncmp(line, "similarity index 100%", 21))
155 else if (!strncmp(line, "diff --git a/", 13))
162 * Git-style diffs with "similarity index 100%" don't
163 * have any hunks and ends with the "rename to foobar"
166 if (rename && old != NULL && new != NULL) {
168 err = send_patch(old, new, git);
172 if (!strncmp(line, "@@ -", 4)) {
173 create = !strncmp(line+4, "0,0", 3);
174 if ((old == NULL && new == NULL) ||
175 (!create && old == NULL))
176 err = got_error(GOT_ERR_PATCH_MALFORMED);
178 err = send_patch(old, new, git);
183 /* rewind to previous line */
184 if (fseeko(fp, -linelen, SEEK_CUR) == -1)
185 err = got_error_from_errno("fseeko");
193 if (ferror(fp) && err == NULL)
194 err = got_error_from_errno("getline");
195 if (feof(fp) && err == NULL)
196 err = got_error(GOT_ERR_NO_PATCH);
200 static const struct got_error *
201 strtolnum(char **str, int *n)
206 for (p = *str; isdigit((unsigned char)*p); ++p)
212 *n = strtonum(*str, 0, INT_MAX, &errstr);
214 return got_error(GOT_ERR_PATCH_MALFORMED);
221 static const struct got_error *
222 parse_hdr(char *s, int *done, struct got_imsg_patch_hunk *hdr)
224 static const struct got_error *err = NULL;
226 if (strncmp(s, "@@ -", 4)) {
234 err = strtolnum(&s, &hdr->oldfrom);
239 err = strtolnum(&s, &hdr->oldlines);
248 if (*s != '+' || !*++s)
249 return got_error(GOT_ERR_PATCH_MALFORMED);
250 err = strtolnum(&s, &hdr->newfrom);
255 err = strtolnum(&s, &hdr->newlines);
265 return got_error(GOT_ERR_PATCH_MALFORMED);
267 if (hdr->oldfrom >= INT_MAX - hdr->oldlines ||
268 hdr->newfrom >= INT_MAX - hdr->newlines ||
269 /* not so sure about this one */
270 hdr->oldlines >= INT_MAX - hdr->newlines - 1 ||
271 (hdr->oldlines == 0 && hdr->newlines == 0))
272 return got_error(GOT_ERR_PATCH_MALFORMED);
274 if (hdr->oldlines == 0) {
275 /* larry says to "do append rather than insert"; I don't
276 * quite get it, but i trust him.
281 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_HUNK, 0, 0, -1,
282 hdr, sizeof(*hdr)) == -1)
283 return got_error_from_errno(
284 "imsg_compose GOT_IMSG_PATCH_HUNK");
288 static const struct got_error *
289 send_line(const char *line)
291 static const struct got_error *err = NULL;
294 if (*line != '+' && *line != '-' && *line != ' ' && *line != '\\') {
295 if (asprintf(&p, " %s", line) == -1)
296 return got_error_from_errno("asprintf");
300 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_LINE, 0, 0, -1,
301 line, strlen(line) + 1) == -1)
302 err = got_error_from_errno(
303 "imsg_compose GOT_IMSG_PATCH_LINE");
309 static const struct got_error *
310 peek_special_line(FILE *fp)
312 const struct got_error *err;
316 if (ch != EOF && ch != '\\') {
322 err = send_line("\\");
327 while (ch != EOF && ch != '\n')
330 if (ch != EOF || feof(fp))
332 return got_error(GOT_ERR_IO);
335 static const struct got_error *
336 parse_hunk(FILE *fp, int *done)
338 static const struct got_error *err = NULL;
339 struct got_imsg_patch_hunk hdr;
340 char *line = NULL, ch;
343 int leftold, leftnew;
345 linelen = getline(&line, &linesize, fp);
351 err = parse_hdr(line, done, &hdr);
355 if (fseeko(fp, -linelen, SEEK_CUR) == -1)
356 err = got_error_from_errno("fseeko");
360 leftold = hdr.oldlines;
361 leftnew = hdr.newlines;
363 while (leftold > 0 || leftnew > 0) {
364 linelen = getline(&line, &linesize, fp);
367 err = got_error_from_errno("getline");
371 /* trailing newlines may be chopped */
372 if (leftold < 3 && leftnew < 3) {
377 err = got_error(GOT_ERR_PATCH_TRUNCATED);
380 if (line[linelen - 1] == '\n')
381 line[linelen - 1] = '\0';
383 /* usr.bin/patch allows '=' as context char */
388 if (ch == '\t' || ch == '\0')
389 ch = ' '; /* the space got eaten */
403 err = got_error(GOT_ERR_PATCH_MALFORMED);
407 if (leftold < 0 || leftnew < 0) {
408 err = got_error(GOT_ERR_PATCH_MALFORMED);
412 err = send_line(line);
416 if ((ch == '-' && leftold == 0) ||
417 (ch == '+' && leftnew == 0)) {
418 err = peek_special_line(fp);
429 static const struct got_error *
430 read_patch(struct imsgbuf *ibuf, int fd)
432 const struct got_error *err = NULL;
436 if ((fp = fdopen(fd, "r")) == NULL) {
437 err = got_error_from_errno("fdopen");
445 err = find_patch(&done, fp);
452 err = parse_hunk(fp, &done);
457 err = send_patch_done();
465 /* ignore trailing gibberish */
466 if (err != NULL && err->code == GOT_ERR_NO_PATCH && patch_found)
473 main(int argc, char **argv)
475 const struct got_error *err = NULL;
483 imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
485 /* revoke access to most system calls */
486 if (pledge("stdio recvfd", NULL) == -1) {
487 err = got_error_from_errno("pledge");
488 got_privsep_send_error(&ibuf, err);
493 err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
496 if (imsg.hdr.type != GOT_IMSG_PATCH_FILE || imsg.fd == -1) {
497 err = got_error(GOT_ERR_PRIVSEP_MSG);
501 err = read_patch(&ibuf, imsg.fd);
504 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_EOF, 0, 0, -1,
506 err = got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
509 err = got_privsep_flush_imsg(&ibuf);
513 got_privsep_send_error(&ibuf, err);
516 if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
517 err = got_error_from_errno("close");
518 if (err && err->code != GOT_ERR_PRIVSEP_PIPE)
519 fprintf(stderr, "%s: %s\n", getprogname(), err->msg);