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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