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whereis.c revision 1.5 
      1 /*-
      2  * Copyright (c) 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      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.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char copyright[] =
     36 "@(#) Copyright (c) 1993\n\
     37 	The Regents of the University of California.  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)whereis.c	8.1 (Berkeley) 6/6/93";*/
     42 static char *rcsid = "$Id: whereis.c,v 1.5 1994/09/18 02:14:34 mycroft 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 
     55 void usage __P((void));
     56 
     57 int
     58 main(argc, argv)
     59 	int argc;
     60 	char *argv[];
     61 {
     62 	struct stat sb;
     63 	size_t len;
     64 	int ch, sverrno, mib[2];
     65 	char *p, *t, *std, path[MAXPATHLEN];
     66 
     67 	while ((ch = getopt(argc, argv, "")) != EOF)
     68 		switch (ch) {
     69 		case '?':
     70 		default:
     71 			usage();
     72 		}
     73 	argc -= optind;
     74 	argv += optind;
     75 
     76 	if (argc == 0)
     77 		usage();
     78 
     79 	/* Retrieve the standard path. */
     80 	mib[0] = CTL_USER;
     81 	mib[1] = USER_CS_PATH;
     82 	if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1)
     83 		return (-1);
     84 	if (len == 0)
     85 		err(1, "user_cs_path: sysctl: zero length\n");
     86 	if ((std = malloc(len)) == NULL)
     87 		err(1, NULL);
     88 	if (sysctl(mib, 2, std, &len, NULL, 0) == -1) {
     89 		sverrno = errno;
     90 		free(std);
     91 		errno = sverrno;
     92 		err(1, "sysctl: user_cs_path");
     93 	}
     94 
     95 	/* For each path, for each program... */
     96 	for (; *argv; ++argv)
     97 		for (p = std;; *p++ = ':') {
     98 			t = p;
     99 			if ((p = strchr(p, ':')) != NULL) {
    100 				*p = '\0';
    101 				if (t == p)
    102 					t = ".";
    103 			} else
    104 				if (strlen(t) == 0)
    105 					t = ".";
    106 			(void)snprintf(path, sizeof(path), "%s/%s", t, *argv);
    107 			if (!stat(path, &sb))
    108 				(void)printf("%s\n", path);
    109 			if (p == NULL)
    110 				break;
    111 		}
    112 }
    113 
    114 void
    115 usage()
    116 {
    117 
    118 	(void)fprintf(stderr, "usage: whereis program [...]\n");
    119 	exit (1);
    120 }
    121