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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /shell_cmds/which/which.c | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'shell_cmds/which/which.c')
-rw-r--r-- | shell_cmds/which/which.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/shell_cmds/which/which.c b/shell_cmds/which/which.c new file mode 100644 index 0000000..7e9d662 --- /dev/null +++ b/shell_cmds/which/which.c @@ -0,0 +1,146 @@ +/** + * 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. + */ + +#include <sys/cdefs.h> + +__FBSDID("$FreeBSD: head/usr.bin/which/which.c 227245 2011-11-06 18:50:26Z ed $"); + +#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 *); + +static int silent; +static int allpaths; + +int +main(int argc, char **argv) +{ + char *p, *path; + ssize_t pathlen; + int opt, status; + + status = EXIT_SUCCESS; + + 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 (argc == 0) + usage(); + + if ((p = getenv("PATH")) == NULL) + exit(EXIT_FAILURE); + pathlen = strlen(p) + 1; + path = malloc(pathlen); + if (path == NULL) + err(EXIT_FAILURE, NULL); + + 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) +{ + + (void)fprintf(stderr, "usage: which [-as] program ...\n"); + exit(EXIT_FAILURE); +} + +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]; + const char *d; + int found; + + if (strchr(filename, '/') != NULL) + return (is_there(filename) ? 0 : -1); + found = 0; + while ((d = strsep(&path, ":")) != NULL) { + if (*d == '\0') + d = "."; + if (snprintf(candidate, sizeof(candidate), "%s/%s", d, + filename) >= (int)sizeof(candidate)) + continue; + if (is_there(candidate)) { + found = 1; + if (!allpaths) + break; + } + } + return (found ? 0 : -1); +} + |