| [821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Which implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under the GPL v2, see the file LICENSE in this tarball.
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| 8 | *
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| 9 | * Based on which from debianutils
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| 10 | */
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| 11 |
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| 12 | #include "busybox.h"
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| 13 | #include <string.h>
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| 14 | #include <stdio.h>
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| 15 | #include <stdlib.h>
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| 16 | #include <unistd.h>
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| 17 | #include <sys/stat.h>
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| 18 |
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| 19 |
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| 20 | static int is_executable_file(const char const * a, struct stat *b)
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| 21 | {
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| 22 | return (!access(a,X_OK) && !stat(a, b) && S_ISREG(b->st_mode));
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| 23 | }
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| 24 |
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| 25 | int which_main(int argc, char **argv)
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| 26 | {
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| 27 | int status;
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| 28 | size_t i, count;
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| 29 | char *path_list;
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| 30 |
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| 31 | if (argc <= 1 || **(argv + 1) == '-') {
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| 32 | bb_show_usage();
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| 33 | }
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| 34 | argc--;
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| 35 |
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| 36 | path_list = getenv("PATH");
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| 37 | if (path_list != NULL) {
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| 38 | size_t path_len = strlen(path_list);
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| 39 | char *new_list = NULL;
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| 40 | count = 1;
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| 41 |
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| 42 | for (i = 0; i <= path_len; i++) {
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| 43 | char *this_i = &path_list[i];
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| 44 | if (*this_i == ':') {
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| 45 | /* ^::[^:] == \.: */
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| 46 | if (!i && (*(this_i + 1) == ':')) {
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| 47 | *this_i = '.';
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| 48 | continue;
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| 49 | }
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| 50 | *this_i = 0;
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| 51 | count++;
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| 52 | /* ^:[^:] == \.0 and [^:]::[^:] == 0\.0 and [^:]:$ == 0\.0 */
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| 53 | if (!i || (*(this_i + 1) == ':') || (i == path_len-1)) {
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| 54 | new_list = xrealloc(new_list, path_len += 1);
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| 55 | if (i) {
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| 56 | memmove(&new_list[i+2], &path_list[i+1], path_len-i);
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| 57 | new_list[i+1] = '.';
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| 58 | memmove(new_list, path_list, i);
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| 59 | } else {
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| 60 | memmove(&new_list[i+1], &path_list[i], path_len-i);
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| 61 | new_list[i] = '.';
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| 62 | }
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| 63 | path_list = new_list;
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| 64 | }
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| 65 | }
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| 66 | }
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| 67 | } else {
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| 68 | path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
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| 69 | count = 5;
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| 70 | }
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| 71 |
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| 72 | status = EXIT_SUCCESS;
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| 73 | while (argc-- > 0) {
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| 74 | struct stat stat_b;
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| 75 | char *buf;
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| 76 | char *path_n;
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| 77 | int found = 0;
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| 78 |
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| 79 | argv++;
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| 80 | path_n = path_list;
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| 81 | buf = *argv;
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| 82 |
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| 83 | /* if filename is either absolute or contains slashes,
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| 84 | * stat it */
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| 85 | if (strchr(buf, '/') != NULL && is_executable_file(buf, &stat_b)) {
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| 86 | found++;
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| 87 | } else {
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| 88 | /* Couldn't access file and file doesn't contain slashes */
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| 89 | for (i = 0; i < count; i++) {
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| 90 | buf = concat_path_file(path_n, *argv);
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| 91 | if (is_executable_file(buf, &stat_b)) {
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| 92 | found++;
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| 93 | break;
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| 94 | }
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| 95 | free(buf);
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| 96 | path_n += (strlen(path_n) + 1);
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| 97 | }
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| 98 | }
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| 99 | if (found) {
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| 100 | puts(buf);
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| 101 | } else {
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| 102 | status = EXIT_FAILURE;
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| 103 | }
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| 104 | }
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| 105 | bb_fflush_stdout_and_exit(status);
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| 106 | }
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