2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include "bsdtar_platform.h"
27 __FBSDID("$FreeBSD: src/usr.bin/tar/util.c,v 1.16 2007/03/11 10:36:42 kientzle Exp $");
29 #ifdef HAVE_SYS_STAT_H
32 #ifdef HAVE_SYS_TYPES_H
33 #include <sys/types.h> /* Linux doesn't define mode_t, etc. in sys/stat.h. */
52 static void bsdtar_vwarnc(struct bsdtar *, int code,
53 const char *fmt, va_list ap);
56 * Print a string, taking care with any non-printable characters.
60 safe_fprintf(FILE *f, const char *fmt, ...)
72 /* Use a stack-allocated buffer if we can, for speed and safety. */
74 buff_length = sizeof(buff_stack);
78 length = vsnprintf(buff, buff_length, fmt, ap);
80 /* If the result is too large, allocate a buffer on the heap. */
81 if (length >= buff_length) {
82 buff_length = length+1;
83 buff_heap = malloc(buff_length);
84 /* Failsafe: use the truncated string if malloc fails. */
85 if (buff_heap != NULL) {
88 length = vsnprintf(buff, buff_length, fmt, ap);
93 /* Write data, expanding unprintable characters. */
97 unsigned char c = *p++;
99 if (isprint(c) && c != '\\')
102 copy_buff[i++] = '\\';
104 case '\a': copy_buff[i++] = 'a'; break;
105 case '\b': copy_buff[i++] = 'b'; break;
106 case '\f': copy_buff[i++] = 'f'; break;
107 case '\n': copy_buff[i++] = 'n'; break;
109 /* On some platforms, \n and \r are the same. */
110 case '\r': copy_buff[i++] = 'r'; break;
112 case '\t': copy_buff[i++] = 't'; break;
113 case '\v': copy_buff[i++] = 'v'; break;
114 case '\\': copy_buff[i++] = '\\'; break;
116 sprintf(copy_buff + i, "%03o", c);
121 /* If our temp buffer is full, dump it and keep going. */
122 if (i > (sizeof(copy_buff) - 8)) {
123 copy_buff[i++] = '\0';
124 fprintf(f, "%s", copy_buff);
128 copy_buff[i++] = '\0';
129 fprintf(f, "%s", copy_buff);
131 /* If we allocated a heap-based buffer, free it now. */
132 if (buff_heap != NULL)
137 bsdtar_vwarnc(struct bsdtar *bsdtar, int code, const char *fmt, va_list ap)
139 fprintf(stderr, "%s: ", bsdtar->progname);
140 vfprintf(stderr, fmt, ap);
142 fprintf(stderr, ": %s", strerror(code));
143 fprintf(stderr, "\n");
147 bsdtar_warnc(struct bsdtar *bsdtar, int code, const char *fmt, ...)
152 bsdtar_vwarnc(bsdtar, code, fmt, ap);
157 bsdtar_errc(struct bsdtar *bsdtar, int eval, int code, const char *fmt, ...)
162 bsdtar_vwarnc(bsdtar, code, fmt, ap);
168 yes(const char *fmt, ...)
176 vfprintf(stderr, fmt, ap);
178 fprintf(stderr, " (y/N)? ");
181 l = read(2, buff, sizeof(buff));
186 for (p = buff; *p != '\0'; p++) {
187 if (isspace(0xff & (int)*p))
203 bsdtar_strmode(struct archive_entry *entry, char *bp)
205 static const char *perms = "?rwxrwxrwx ";
206 static const mode_t permbits[] =
207 { S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IWGRP, S_IXGRP,
208 S_IROTH, S_IWOTH, S_IXOTH };
212 /* Fill in a default string, then selectively override. */
215 mode = archive_entry_mode(entry);
216 switch (mode & S_IFMT) {
217 case S_IFREG: bp[0] = '-'; break;
218 case S_IFBLK: bp[0] = 'b'; break;
219 case S_IFCHR: bp[0] = 'c'; break;
220 case S_IFDIR: bp[0] = 'd'; break;
221 case S_IFLNK: bp[0] = 'l'; break;
222 case S_IFSOCK: bp[0] = 's'; break;
224 case S_IFIFO: bp[0] = 'p'; break;
227 case S_IFWHT: bp[0] = 'w'; break;
231 for (i = 0; i < 9; i++)
232 if (!(mode & permbits[i]))
235 if (mode & S_ISUID) {
236 if (mode & S_IXUSR) bp[3] = 's';
239 if (mode & S_ISGID) {
240 if (mode & S_IXGRP) bp[6] = 's';
243 if (mode & S_ISVTX) {
244 if (mode & S_IXOTH) bp[9] = 't';
247 if (archive_entry_acl_count(entry, ARCHIVE_ENTRY_ACL_TYPE_ACCESS))
253 * Read lines from file and do something with each one. If option_null
254 * is set, lines are terminated with zero bytes; otherwise, they're
255 * terminated with newlines.
257 * This uses a self-sizing buffer to handle arbitrarily-long lines.
258 * If the "process" function returns non-zero for any line, this
259 * function will return non-zero after attempting to process all
263 process_lines(struct bsdtar *bsdtar, const char *pathname,
264 int (*process)(struct bsdtar *, const char *))
267 char *buff, *buff_end, *line_start, *line_end, *p;
268 size_t buff_length, bytes_read, bytes_wanted;
272 separator = bsdtar->option_null ? '\0' : '\n';
275 if (strcmp(pathname, "-") == 0)
278 f = fopen(pathname, "r");
280 bsdtar_errc(bsdtar, 1, errno, "Couldn't open %s", pathname);
282 buff = malloc(buff_length);
284 bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read %s", pathname);
285 line_start = line_end = buff_end = buff;
287 /* Get some more data into the buffer. */
288 bytes_wanted = buff + buff_length - buff_end;
289 bytes_read = fread(buff_end, 1, bytes_wanted, f);
290 buff_end += bytes_read;
291 /* Process all complete lines in the buffer. */
292 while (line_end < buff_end) {
293 if (*line_end == separator) {
295 if ((*process)(bsdtar, line_start) != 0)
297 line_start = line_end + 1;
298 line_end = line_start;
305 bsdtar_errc(bsdtar, 1, errno,
306 "Can't read %s", pathname);
307 if (line_start > buff) {
308 /* Move a leftover fractional line to the beginning. */
309 memmove(buff, line_start, buff_end - line_start);
310 buff_end -= line_start - buff;
311 line_end -= line_start - buff;
314 /* Line is too big; enlarge the buffer. */
315 p = realloc(buff, buff_length *= 2);
317 bsdtar_errc(bsdtar, 1, ENOMEM,
318 "Line too long in %s", pathname);
319 buff_end = p + (buff_end - buff);
320 line_end = p + (line_end - buff);
321 line_start = buff = p;
324 /* At end-of-file, handle the final line. */
325 if (line_end > line_start) {
327 if ((*process)(bsdtar, line_start) != 0)
337 * The logic here for -C <dir> attempts to avoid
338 * chdir() as long as possible. For example:
339 * "-C /foo -C /bar file" needs chdir("/bar") but not chdir("/foo")
340 * "-C /foo -C bar file" needs chdir("/foo/bar")
341 * "-C /foo -C bar /file1" does not need chdir()
342 * "-C /foo -C bar /file1 file2" needs chdir("/foo/bar") before file2
344 * The only correct way to handle this is to record a "pending" chdir
345 * request and combine multiple requests intelligently until we
346 * need to process a non-absolute file. set_chdir() adds the new dir
347 * to the pending list; do_chdir() actually executes any pending chdir.
349 * This way, programs that build tar command lines don't have to worry
350 * about -C with non-existent directories; such requests will only
351 * fail if the directory must be accessed.
354 set_chdir(struct bsdtar *bsdtar, const char *newdir)
356 if (newdir[0] == '/') {
357 /* The -C /foo -C /bar case; dump first one. */
358 free(bsdtar->pending_chdir);
359 bsdtar->pending_chdir = NULL;
361 if (bsdtar->pending_chdir == NULL)
362 /* Easy case: no previously-saved dir. */
363 bsdtar->pending_chdir = strdup(newdir);
365 /* The -C /foo -C bar case; concatenate */
366 char *old_pending = bsdtar->pending_chdir;
367 size_t old_len = strlen(old_pending);
368 bsdtar->pending_chdir = malloc(old_len + strlen(newdir) + 2);
369 if (old_pending[old_len - 1] == '/')
370 old_pending[old_len - 1] = '\0';
371 if (bsdtar->pending_chdir != NULL)
372 sprintf(bsdtar->pending_chdir, "%s/%s",
373 old_pending, newdir);
376 if (bsdtar->pending_chdir == NULL)
377 bsdtar_errc(bsdtar, 1, errno, "No memory");
381 do_chdir(struct bsdtar *bsdtar)
383 if (bsdtar->pending_chdir == NULL)
386 if (chdir(bsdtar->pending_chdir) != 0) {
387 bsdtar_errc(bsdtar, 1, 0, "could not chdir to '%s'\n",
388 bsdtar->pending_chdir);
390 free(bsdtar->pending_chdir);
391 bsdtar->pending_chdir = NULL;
395 * Handle --strip-components and any future path-rewriting options.
396 * Returns non-zero if the pathname should not be extracted.
398 * TODO: Support pax-style regex path rewrites.
401 edit_pathname(struct bsdtar *bsdtar, struct archive_entry *entry)
403 const char *name = archive_entry_pathname(entry);
405 /* Strip leading dir names as per --strip-components option. */
406 if (bsdtar->strip_components > 0) {
407 int r = bsdtar->strip_components;
408 const char *p = name;
417 /* Path is too short, skip it. */
423 /* Strip redundant leading '/' characters. */
424 while (name[0] == '/' && name[1] == '/')
427 /* Strip leading '/' unless user has asked us not to. */
428 if (name[0] == '/' && !bsdtar->option_absolute_paths) {
429 /* Generate a warning the first time this happens. */
430 if (!bsdtar->warned_lead_slash) {
431 bsdtar_warnc(bsdtar, 0,
432 "Removing leading '/' from member names");
433 bsdtar->warned_lead_slash = 1;
436 /* Special case: Stripping leading '/' from "/" yields ".". */
441 /* Safely replace name in archive_entry. */
442 if (name != archive_entry_pathname(entry)) {
443 char *q = strdup(name);
444 archive_entry_copy_pathname(entry, q);
451 * Like strcmp(), but try to be a little more aware of the fact that
452 * we're comparing two paths.
454 * TODO: Make this better, so that "./a//b/./c" == "a/b/c"
457 pathcmp(const char *a, const char *b)
459 if (a[0] == '.' && a[1] == '/' && a[2] != '\0')
461 if (b[0] == '.' && b[1] == '/' && b[2] != '\0')
463 return (strcmp(a, b));