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84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Which implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*
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* Based on which from debianutils
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*/
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#include "busybox.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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static int is_executable_file(char *a, struct stat *b)
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{
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return (!access(a,X_OK) && !stat(a, b) && S_ISREG(b->st_mode));
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}
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int which_main(int argc, char **argv)
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{
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int status;
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size_t i, count;
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char *path_list, *p;
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if (argc <= 1 || argv[1][0] == '-') {
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bb_show_usage();
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}
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argc--;
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path_list = getenv("PATH");
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if (path_list != NULL) {
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count = 1;
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p = path_list;
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while ((p = strchr(p, ':')) != NULL) {
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*p++ = 0;
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count++;
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}
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} else {
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path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
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count = 5;
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}
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status = EXIT_SUCCESS;
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while (argc-- > 0) {
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struct stat stat_b;
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char *buf;
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argv++;
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buf = argv[0];
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/* If filename is either absolute or contains slashes,
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* stat it */
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if (strchr(buf, '/')) {
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if (is_executable_file(buf, &stat_b)) {
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puts(buf);
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goto next;
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}
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} else {
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/* File doesn't contain slashes */
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p = path_list;
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for (i = 0; i < count; i++) {
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/* Empty component in PATH is treated as . */
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buf = concat_path_file(p[0] ? p : ".", argv[0]);
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if (is_executable_file(buf, &stat_b)) {
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puts(buf);
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free(buf);
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goto next;
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}
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free(buf);
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p += strlen(p) + 1;
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}
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}
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status = EXIT_FAILURE;
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next: /* nothing */;
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}
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bb_fflush_stdout_and_exit(status);
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}
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