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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: which.c,v 1.15 2009/10/27 23:59:50 deraadt Exp $	*/

/*
 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/sysctl.h>

#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define PROG_WHICH	1
#define PROG_WHEREIS	2

extern char *__progname;

int findprog(char *, char *, int, int);
__dead void usage(void);

/*
 * which(1) -- find an executable(s) in the user's path
 * whereis(1) -- find an executable(s) in the default user path
 *
 * Return values:
 *	0 - all executables found
 *	1 - some found, some not
 *	2 - none found
 */

int
main(int argc, char *argv[])
{
	char *path;
	size_t n;
	int ch, allmatches = 0, notfound = 0, progmode = PROG_WHICH;

	(void)setlocale(LC_ALL, "");

	if (argc == 1)
		usage();

	/* Don't accept command args but check since old whereis(1) used to */
	while ((ch = getopt(argc, argv, "a")) != -1) {
		switch (ch) {
		case 'a':
			allmatches = 1;
			break;
		default:
			usage();
		}
	}

	/*
	 * which(1) uses user's $PATH.
	 * whereis(1) uses user.cs_path from sysctl(3).
	 */
	if (strcmp(__progname, "whereis") == 0) {
		int mib[2];

		progmode = PROG_WHEREIS;
		mib[0] = CTL_USER;
		mib[1] = USER_CS_PATH;
		if (sysctl(mib, 2, NULL, &n, NULL, 0) == -1)
			err(1, "unable to get length of user.cs_path");
		if (n == 0)
			errx(1, "user.cs_path was zero length!");
		if ((path = (char *)malloc(n)) == NULL)
			errx(1, "can't allocate memory.");
		if (sysctl(mib, 2, path, &n, NULL, 0) == -1)
			err(1, "unable to get user.cs_path");
	} else {
		if ((path = getenv("PATH")) == NULL)
			err(1, "can't get $PATH from environment");
	}

	/* To make access(2) do what we want */
	if (setgid(getegid()))
		err(1, "Can't set gid to %u", getegid());
	if (setuid(geteuid()))
		err(1, "Can't set uid to %u", geteuid());

	for (n = optind; n < argc; n++)
		if (findprog(argv[n], path, progmode, allmatches) == 0)
			notfound++;

	exit((notfound == 0) ? 0 : ((notfound == argc - 1) ? 2 : 1));
}

int
findprog(char *prog, char *path, int progmode, int allmatches)
{
	char *p, filename[MAXPATHLEN];
	int proglen, plen, rval = 0;
	struct stat sbuf;
	char *pathcpy;

	/* Special case if prog contains '/' */
	if (strchr(prog, '/')) {
		if ((stat(prog, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
		    access(prog, X_OK) == 0) {
			(void)puts(prog);
			return (1);
		} else {
			(void)printf("%s: Command not found.\n", prog);
			return (0);
		}
	}

	if ((path = strdup(path)) == NULL)
		errx(1, "Can't allocate memory.");
	pathcpy = path;

	proglen = strlen(prog);
	while ((p = strsep(&pathcpy, ":")) != NULL) {
		if (*p == '\0')
			p = ".";

		plen = strlen(p);
		while (p[plen-1] == '/')
			p[--plen] = '\0';	/* strip trailing '/' */

		if (plen + 1 + proglen >= sizeof(filename)) {
			warnx("%s/%s: %s", p, prog, strerror(ENAMETOOLONG));
			free(path);
			return (0);
		}

		snprintf(filename, sizeof(filename), "%s/%s", p, prog);
		if ((stat(filename, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
		    access(filename, X_OK) == 0) {
			(void)puts(filename);
			rval = 1;
			if (!allmatches) {
				free(path);
				return (rval);
			}
		}
	}
	(void)free(path);

	/* whereis(1) is silent on failure. */
	if (!rval && progmode != PROG_WHEREIS)
		(void)printf("%s: Command not found.\n", prog);
	return (rval);
}

__dead void
usage(void)
{
	(void)fprintf(stderr, "usage: %s [-a] name ...\n", __progname);
	exit(1);
}