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whereis.c revision 1.9 
      1 /*	$NetBSD: whereis.c,v 1.9 1999/03/11 10:42:43 fair 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)whereis.c	8.3 (Berkeley) 5/4/95";
     45 #endif
     46 __RCSID("$NetBSD: whereis.c,v 1.9 1999/03/11 10:42:43 fair Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/param.h>
     50 #include <sys/stat.h>
     51 #include <sys/sysctl.h>
     52 
     53 #include <err.h>
     54 #include <errno.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <unistd.h>
     59 
     60 void usage __P((void));
     61 int main __P((int, char *[]));
     62 
     63 int
     64 main(argc, argv)
     65 	int argc;
     66 	char *argv[];
     67 {
     68 	struct stat sb;
     69 	size_t len;
     70 	int ch, sverrno, mib[2];
     71 	char *p, *t, *std, path[MAXPATHLEN];
     72 	int useenvpath = 0;
     73 
     74 	while ((ch = getopt(argc, argv, "p")) != -1)
     75 		switch (ch) {
     76 		case 'p':
     77 			useenvpath = 1;	/* use environment for PATH */
     78 			break;
     79 
     80 		case '?':
     81 		default:
     82 			usage();
     83 		}
     84 	argc -= optind;
     85 	argv += optind;
     86 
     87 	if (argc == 0)
     88 		usage();
     89 
     90  	if (useenvpath) {
     91  		if ((std = getenv("PATH")) == NULL)
     92  			err(1, "getenv: PATH" );
     93 	} else {
     94 		/* Retrieve the standard path. */
     95 		mib[0] = CTL_USER;
     96 		mib[1] = USER_CS_PATH;
     97 		if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1)
     98 			return (-1);
     99 		if (len == 0)
    100 			err(1, "user_cs_path: sysctl: zero length\n");
    101 		if ((std = malloc(len)) == NULL)
    102 			err(1, "%s", "");
    103 		if (sysctl(mib, 2, std, &len, NULL, 0) == -1) {
    104 			sverrno = errno;
    105 			free(std);
    106 			errno = sverrno;
    107 			err(1, "sysctl: user_cs_path");
    108 		}
    109 	}
    110 
    111 	/* For each path, for each program... */
    112 	for (; *argv; ++argv)
    113 		for (p = std;; *p++ = ':') {
    114 			t = p;
    115 			if ((p = strchr(p, ':')) != NULL) {
    116 				*p = '\0';
    117 				if (t == p)
    118 					t = ".";
    119 			} else
    120 				if (strlen(t) == 0)
    121 					t = ".";
    122 			(void)snprintf(path, sizeof(path), "%s/%s", t, *argv);
    123 			if (!stat(path, &sb))
    124 				(void)printf("%s\n", path);
    125 			if (p == NULL)
    126 				break;
    127 		}
    128 
    129 	return (0);
    130 }
    131 
    132 void
    133 usage()
    134 {
    135 
    136 	(void)fprintf(stderr, "usage: whereis [-p] program [...]\n");
    137 	exit (1);
    138 }
    139