115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <stdint.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "util.h"
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#define PORTABLE_CHARACTER_SET "0123456789._-qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"
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/* If your system supports more other characters, but not all non-NUL characters, define SYSTEM_CHARACTER_SET. */
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static int most = 0;
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static int extra = 0;
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static int
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pathchk(char *filename)
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{
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char *invalid, *invalid_end, *p, *q;
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const char *character_set;
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size_t len, maxlen;
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struct stat st;
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/* Empty? */
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if (extra && !*filename) {
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weprintf("%s: empty filename\n", argv0);
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return 1;
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}
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/* Leading hyphen? */
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if (extra && ((*filename == '-') || strstr(filename, "/-"))) {
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weprintf("%s: %s: leading '-' in component of filename\n", argv0, filename);
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return 1;
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}
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/* Nonportable character? */
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#ifdef SYSTEM_CHARACTER_SET
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character_set = "/"SYSTEM_CHARACTER_SET;
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#else
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character_set = 0;
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#endif
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if (most)
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character_set = "/"PORTABLE_CHARACTER_SET;
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if (character_set && *(invalid = filename + strspn(filename, character_set))) {
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for (invalid_end = invalid + 1; *invalid_end & 0x80; invalid_end++);
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weprintf("%s: %s: ", argv0, filename);
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*invalid_end = 0;
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weprintf("nonportable character '%s'\n", invalid);
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return 1;
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}
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/* Symlink error? Non-searchable directory? */
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if (lstat(filename, &st) && errno != ENOENT) {
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/* lstat rather than stat, so that if filename is a bad symlink, but
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* all parents are OK, no error will be detected. */
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weprintf("%s: %s:", argv0, filename);
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return 1;
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}
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/* Too long pathname? */
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maxlen = most ? _POSIX_PATH_MAX : PATH_MAX;
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if (strlen(filename) >= maxlen) {
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weprintf("%s: %s: is longer than %zu bytes\n",
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argv0, filename, maxlen);
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return 1;
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}
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/* Too long component? */
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maxlen = most ? _POSIX_NAME_MAX : NAME_MAX;
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for (p = filename; p; p = q) {
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q = strchr(p, '/');
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len = q ? (size_t)(q++ - p) : strlen(p);
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if (len > maxlen) {
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weprintf("%s: %s: includes component longer than %zu bytes\n",
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argv0, filename, maxlen);
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return 1;
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}
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}
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return 0;
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-pP] filename...\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int ret = 0;
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ARGBEGIN {
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case 'p':
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most = 1;
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break;
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case 'P':
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extra = 1;
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break;
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default:
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usage();
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} ARGEND;
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if (!argc)
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usage();
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for (; argc--; argv++)
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ret |= pathchk(*argv);
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return ret;
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}
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