diff options
author | green <green@FreeBSD.org> | 2000-08-29 23:30:52 +0000 |
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committer | green <green@FreeBSD.org> | 2000-08-29 23:30:52 +0000 |
commit | 5cf3170b6ba4af5c823aa0d955541cd8431472c6 (patch) | |
tree | 0b72d82a9593283d4a36bc3ae2e05d74e5d21f5d /usr.bin | |
parent | dc39c37d3d9aa75c3bcb19da228d42d09d1acf1c (diff) | |
download | FreeBSD-src-5cf3170b6ba4af5c823aa0d955541cd8431472c6.zip FreeBSD-src-5cf3170b6ba4af5c823aa0d955541cd8431472c6.tar.gz |
Use a C version of which(1).
Submitted by: Dan Papasian <bugg@bugg.strangled.net>
Reviewed by: jhb
Diffstat (limited to 'usr.bin')
-rw-r--r-- | usr.bin/which/Makefile | 9 | ||||
-rw-r--r-- | usr.bin/which/which.c | 145 |
2 files changed, 146 insertions, 8 deletions
diff --git a/usr.bin/which/Makefile b/usr.bin/which/Makefile index 9464640..fdc121b 100644 --- a/usr.bin/which/Makefile +++ b/usr.bin/which/Makefile @@ -1,13 +1,6 @@ # @(#)Makefile 8.1 (Berkeley) 6/6/93 # $FreeBSD$ -MAINTAINER= wosch - - -MAN1= which.1 - -beforeinstall: - ${INSTALL} -c -o ${BINOWN} -g ${BINGRP} -m ${BINMODE} \ - ${.CURDIR}/which.pl ${DESTDIR}${BINDIR}/which +PROG= which .include <bsd.prog.mk> diff --git a/usr.bin/which/which.c b/usr.bin/which/which.c new file mode 100644 index 0000000..c0435fb --- /dev/null +++ b/usr.bin/which/which.c @@ -0,0 +1,145 @@ +/** + * Copyright (c) 2000 Dan Papasian. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/stat.h> +#include <sys/param.h> + +#include <err.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +static void usage(void); +static int print_matches(char *, char *); + +int silent; +int allpaths; + +int +main(int argc, char **argv) +{ + char *p, *path; + ssize_t pathlen; + int opt, status; + + status = EXIT_SUCCESS; + + /* If called without args, die silently to conform */ + if (argc < 2) + exit(EXIT_FAILURE); + + while ((opt = getopt(argc, argv, "as")) != -1) { + switch (opt) { + case 'a': + allpaths = 1; + break; + case 's': + silent = 1; + break; + default: + usage(); + break; + } + } + + argv += optind; + argc -= optind; + + if ((p = getenv("PATH")) == NULL) + exit(EXIT_FAILURE); + pathlen = strlen(p) + 1; + path = malloc(pathlen); + if (path == NULL) + err(EXIT_FAILURE, NULL); + + if (argc == 0) + status = EXIT_FAILURE; + + while (argc > 0) { + memcpy(path, p, pathlen); + + if (strlen(*argv) > FILENAME_MAX || + print_matches(path, *argv) == -1) + status = EXIT_FAILURE; + + argv++; + argc--; + } + + exit(status); +} + +static void +usage(void) +{ + + errx(EXIT_FAILURE, "usage: which [-as] program ..."); +} + +static int +is_there(char *candidate) +{ + struct stat fin; + + /* XXX work around access(2) false positives for superuser */ + if (access(candidate, X_OK) == 0 && + stat(candidate, &fin) == 0 && + S_ISREG(fin.st_mode) && + (getuid() != 0 || + (fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) { + if (!silent) + printf("%s\n", candidate); + return (1); + } + return (0); +} + +static int +print_matches(char *path, char *filename) +{ + char candidate[PATH_MAX]; + char *d; + int found; + + if (*filename == '/') + return (is_there(filename) ? 0 : -1); + found = 0; + while ((d = strsep(&path, ":")) != NULL) { + if (snprintf(candidate, sizeof(candidate), "%s/%s", d, + filename) >= sizeof(candidate)) + continue; + if (is_there(candidate)) { + found = 1; + if (!allpaths) + break; + } + } + return (found ? 0 : -1); +} + |