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)
65 struct got_imsg_patch p;
67 memset(&p, 0, sizeof(p));
70 strlcpy(p.old, oldname, sizeof(p.old));
72 strlcpy(p.new, newname, sizeof(p.new));
74 if (imsg_compose(&ibuf, GOT_IMSG_PATCH, 0, 0, -1,
76 return got_error_from_errno("imsg_compose GOT_IMSG_PATCH");
80 static const struct got_error *
83 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_DONE, 0, 0, -1,
85 return got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
86 if (imsg_flush(&ibuf) == -1)
87 return got_error_from_errno("imsg_flush");
91 /* based on fetchname from usr.bin/patch/util.c */
92 static const struct got_error *
93 filename(const char *at, char **name, int strip)
102 while (isspace((unsigned char)*at))
105 /* files can be created or removed by diffing against /dev/null */
106 if (!strncmp(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL)-1))
111 return got_error_from_errno("strdup");
112 *name = fullname = t;
113 tab = strchr(t, '\t') != NULL;
115 /* strip off path components and NUL-terminate */
117 *t != '\0' && ((tab && *t != '\t') || !isspace((unsigned char)*t));
119 if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
125 *name = strdup(*name);
128 return got_error_from_errno("strdup");
132 static const struct got_error *
135 const struct got_error *err = NULL;
136 char *old = NULL, *new = NULL;
142 while ((linelen = getline(&line, &linesize, fp)) != -1) {
144 * Ignore the Index name like GNU and larry' patch,
145 * we don't have to follow POSIX.
148 if (git && !strncmp(line, "--- a/", 6)) {
150 err = filename(line+6, &old, 0);
151 } else if (!strncmp(line, "--- ", 4)) {
153 err = filename(line+4, &old, 0);
154 } else if (git && !strncmp(line, "+++ b/", 6)) {
156 err = filename(line+6, &new, 0);
157 } else if (!strncmp(line, "+++ ", 4)) {
159 err = filename(line+4, &new, 0);
160 } else if (!strncmp(line, "diff --git a/", 13))
166 if (!strncmp(line, "@@ -", 4)) {
167 create = !strncmp(line+4, "0,0", 3);
168 if ((old == NULL && new == NULL) ||
169 (!create && old == NULL))
170 err = got_error(GOT_ERR_PATCH_MALFORMED);
172 err = send_patch(old, new);
180 /* rewind to previous line */
181 if (fseek(fp, linelen * -1, SEEK_CUR) == -1)
182 err = got_error_from_errno("fseek");
188 if (ferror(fp) && err == NULL)
189 err = got_error_from_errno("getline");
190 if (feof(fp) && err == NULL)
191 err = got_error(GOT_ERR_NO_PATCH);
195 static const struct got_error *
196 strtolnum(char **str, long *n)
201 for (p = *str; isdigit((unsigned char)*p); ++p)
207 *n = strtonum(*str, 0, LONG_MAX, &errstr);
209 return got_error(GOT_ERR_PATCH_MALFORMED);
216 static const struct got_error *
217 parse_hdr(char *s, int *ok, struct got_imsg_patch_hunk *hdr)
219 static const struct got_error *err = NULL;
222 if (strncmp(s, "@@ -", 4)) {
230 err = strtolnum(&s, &hdr->oldfrom);
235 err = strtolnum(&s, &hdr->oldlines);
244 if (*s != '+' || !*++s)
245 return got_error(GOT_ERR_PATCH_MALFORMED);
246 err = strtolnum(&s, &hdr->newfrom);
251 err = strtolnum(&s, &hdr->newlines);
261 return got_error(GOT_ERR_PATCH_MALFORMED);
263 if (hdr->oldfrom >= LONG_MAX - hdr->oldlines ||
264 hdr->newfrom >= LONG_MAX - hdr->newlines ||
265 /* not so sure about this one */
266 hdr->oldlines >= LONG_MAX - hdr->newlines - 1)
267 return got_error(GOT_ERR_PATCH_MALFORMED);
269 if (hdr->oldlines == 0) {
270 /* larry says to "do append rather than insert"; I don't
271 * quite get it, but i trust him.
276 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_HUNK, 0, 0, -1,
277 hdr, sizeof(*hdr)) == -1)
278 return got_error_from_errno(
279 "imsg_compose GOT_IMSG_PATCH_HUNK");
283 static const struct got_error *
284 send_line(const char *line)
286 static const struct got_error *err = NULL;
289 if (*line != '+' && *line != '-' && *line != ' ') {
290 if (asprintf(&p, " %s", line) == -1)
291 return got_error_from_errno("asprintf");
295 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_LINE, 0, 0, -1,
296 line, strlen(line)+1) == -1)
297 err = got_error_from_errno(
298 "imsg_compose GOT_IMSG_PATCH_LINE");
304 static const struct got_error *
305 parse_hunk(FILE *fp, int *ok)
307 static const struct got_error *err = NULL;
308 struct got_imsg_patch_hunk hdr;
309 char *line = NULL, ch;
312 long leftold, leftnew;
314 linelen = getline(&line, &linesize, fp);
320 err = parse_hdr(line, ok, &hdr);
324 if (fseek(fp, linelen * -1, SEEK_CUR) == -1)
325 err = got_error_from_errno("fseek");
329 leftold = hdr.oldlines;
330 leftnew = hdr.newlines;
332 while (leftold > 0 || leftnew > 0) {
333 linelen = getline(&line, &linesize, fp);
336 err = got_error_from_errno("getline");
340 /* trailing newlines may be chopped */
341 if (leftold < 3 && leftnew < 3) {
346 err = got_error(GOT_ERR_PATCH_TRUNCATED);
350 /* usr.bin/patch allows '=' as context char */
355 if (ch == '\t' || ch == '\n')
356 ch = ' '; /* the space got eaten */
370 err = got_error(GOT_ERR_PATCH_MALFORMED);
374 if (leftold < 0 || leftnew < 0) {
375 err = got_error(GOT_ERR_PATCH_MALFORMED);
379 err = send_line(line);
389 static const struct got_error *
390 read_patch(struct imsgbuf *ibuf, int fd)
392 const struct got_error *err = NULL;
394 int ok, patch_found = 0;
396 if ((fp = fdopen(fd, "r")) == NULL) {
397 err = got_error_from_errno("fdopen");
403 err = find_patch(fp);
409 err = parse_hunk(fp, &ok);
413 err = send_patch_done();
424 /* ignore trailing gibberish */
425 if (err != NULL && err->code == GOT_ERR_NO_PATCH && patch_found)
432 main(int argc, char **argv)
434 const struct got_error *err = NULL;
442 imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
444 /* revoke access to most system calls */
445 if (pledge("stdio recvfd", NULL) == -1) {
446 err = got_error_from_errno("pledge");
447 got_privsep_send_error(&ibuf, err);
452 err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
455 if (imsg.hdr.type != GOT_IMSG_PATCH_FILE || imsg.fd == -1) {
456 err = got_error(GOT_ERR_PRIVSEP_MSG);
460 err = read_patch(&ibuf, imsg.fd);
463 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_EOF, 0, 0, -1,
465 err = got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
468 err = got_privsep_flush_imsg(&ibuf);
472 got_privsep_send_error(&ibuf, err);
475 if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
476 err = got_error_from_errno("close");
477 if (err && err->code != GOT_ERR_PRIVSEP_PIPE)
478 fprintf(stderr, "%s: %s\n", getprogname(), err->msg);