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whereis.c revision 1.13 
      1 /*	$NetBSD: whereis.c,v 1.13 2003/08/07 11:17:17 agc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)whereis.c	8.3 (Berkeley) 5/4/95";
     41 #endif
     42 __RCSID("$NetBSD: whereis.c,v 1.13 2003/08/07 11:17:17 agc Exp $");
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 #include <sys/sysctl.h>
     48 
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <stdio.h>
     52 #include <stdlib.h>
     53 #include <string.h>
     54 #include <unistd.h>
     55 
     56 void usage __P((void));
     57 int main __P((int, char *[]));
     58 
     59 int
     60 main(argc, argv)
     61 	int argc;
     62 	char *argv[];
     63 {
     64 	struct stat sb;
     65 	size_t len;
     66 	int ch, sverrno, mib[2];
     67 	char *p, *t, *std, path[MAXPATHLEN];
     68 	int useenvpath = 0, found = 0;
     69 
     70 	while ((ch = getopt(argc, argv, "p")) != -1)
     71 		switch (ch) {
     72 		case 'p':
     73 			useenvpath = 1;	/* use environment for PATH */
     74 			break;
     75 
     76 		case '?':
     77 		default:
     78 			usage();
     79 		}
     80 	argc -= optind;
     81 	argv += optind;
     82 
     83 	if (argc == 0)
     84 		usage();
     85 
     86  	if (useenvpath) {
     87  		if ((std = getenv("PATH")) == NULL)
     88  			err(1, "getenv: PATH" );
     89 	} else {
     90 		/* Retrieve the standard path. */
     91 		mib[0] = CTL_USER;
     92 		mib[1] = USER_CS_PATH;
     93 		if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1)
     94 			return (-1);
     95 		if (len == 0)
     96 			err(1, "user_cs_path: sysctl: zero length");
     97 		if ((std = malloc(len)) == NULL)
     98 			err(1, NULL);
     99 		if (sysctl(mib, 2, std, &len, NULL, 0) == -1) {
    100 			sverrno = errno;
    101 			free(std);
    102 			errno = sverrno;
    103 			err(1, "sysctl: user_cs_path");
    104 		}
    105 	}
    106 
    107 	/* For each path, for each program... */
    108 	for (; *argv; ++argv)
    109 		for (p = std;; *p++ = ':') {
    110 			t = p;
    111 			if ((p = strchr(p, ':')) != NULL) {
    112 				*p = '\0';
    113 				if (t == p)
    114 					t = ".";
    115 			} else
    116 				if (strlen(t) == 0)
    117 					t = ".";
    118 			(void)snprintf(path, sizeof(path), "%s/%s", t, *argv);
    119 			if (!stat(path, &sb)) {
    120 				(void)printf("%s\n", path);
    121 				found++;
    122 			}
    123 			if (p == NULL)
    124 				break;
    125 		}
    126 
    127 	return ((found == 0) ? 3 : ((found == argc) ? 0 : 2));
    128 }
    129 
    130 void
    131 usage()
    132 {
    133 
    134 	(void)fprintf(stderr, "usage: whereis [-p] program [...]\n");
    135 	exit (1);
    136 }
    137