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	pathchk.c - sbase - suckless unix tools
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	pathchk.c (2341B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/stat.h>
	3
	4 #include <errno.h>
	5 #include <limits.h>
	6 #include <stdint.h>
	7 #include <stdio.h>
	8 #include <stdlib.h>
	9 #include <string.h>
	10
	11 #include "util.h"
	12
	13 #define PORTABLE_CHARACTER_SET "0123456789._-qwertyuiopasdfghjklzxcvbnmQ…
	14 /* If your system supports more other characters, but not all non-NUL ch…
	15
	16 static int most = 0;
	17 static int extra = 0;
	18
	19 static int
	20 pathchk(char *filename)
	21 {
	22 char invalid, invalid_end, p, q;
	23 const char *character_set;
	24 size_t len, maxlen;
	25 struct stat st;
	26
	27 /* Empty? */
	28 if (extra && !*filename)
	29 eprintf("empty filename\n");
	30
	31 /* Leading hyphen? */
	32 if (extra && ((*filename == '-') \|\| strstr(filename, "/-")))
	33 eprintf("%s: leading '-' in component of filename\n", fi…
	34
	35 /* Nonportable character? */
	36 #ifdef SYSTEM_CHARACTER_SET
	37 character_set = "/"SYSTEM_CHARACTER_SET;
	38 #else
	39 character_set = 0;
	40 #endif
	41 if (most)
	42 character_set = "/"PORTABLE_CHARACTER_SET;
	43 if (character_set && *(invalid = filename + strspn(filename, cha…
	44 for (invalid_end = invalid + 1; *invalid_end & 0x80; inv…
	45 p = estrdup(filename);
	46 *invalid_end = 0;
	47 eprintf("%s: nonportable character '%s'\n", p, invalid);
	48 }
	49
	50 /* Symlink error? Non-searchable directory? */
	51 if (lstat(filename, &st) && errno != ENOENT) {
	52 /* lstat rather than stat, so that if filename is a bad …
	53 * all parents are OK, no error will be detected. */
	54 eprintf("%s:", filename);
	55 }
	56
	57 /* Too long pathname? */
	58 maxlen = most ? _POSIX_PATH_MAX : PATH_MAX;
	59 if (strlen(filename) >= maxlen)
	60 eprintf("%s: is longer than %zu bytes\n", filename, maxl…
	61
	62 /* Too long component? */
	63 maxlen = most ? _POSIX_NAME_MAX : NAME_MAX;
	64 for (p = filename; p; p = q) {
	65 q = strchr(p, '/');
	66 len = q ? (size_t)(q++ - p) : strlen(p);
	67 if (len > maxlen)
	68 eprintf("%s: includes component longer than %zu …
	69 filename, maxlen);
	70 }
	71
	72 return 0;
	73 }
	74
	75 static void
	76 usage(void)
	77 {
	78 eprintf("usage: %s [-pP] filename...\n", argv0);
	79 }
	80
	81 int
	82 main(int argc, char *argv[])
	83 {
	84 int ret = 0;
	85
	86 ARGBEGIN {
	87 case 'p':
	88 most = 1;
	89 break;
	90 case 'P':
	91 extra = 1;
	92 break;
	93 default:
	94 usage();
	95 } ARGEND
	96
	97 if (!argc)
	98 usage();
	99
	100 for (; argc--; argv++)
	101 ret \|= pathchk(*argv);
	102
	103 return ret;
	104 }