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a389651115
as the old optimization did (actually does slightly better under gcc 4.0), and simplifies the code.
110 lines
2.3 KiB
C
110 lines
2.3 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, 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 <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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#include "busybox.h"
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int which_main(int argc, char **argv)
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{
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int status = EXIT_SUCCESS;
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size_t i, count;
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char *path_list;
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if (argc <= 1 || **(argv + 1) == '-') {
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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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size_t path_len = strlen(path_list);
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char *new_list = NULL;
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count = 1;
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for (i = 0; i <= path_len; i++) {
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char *this_i = &path_list[i];
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if (*this_i == ':') {
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/* ^::[^:] == \.: */
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if (!i && (*(this_i + 1) == ':')) {
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*this_i = '.';
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continue;
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}
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*this_i = 0;
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count++;
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/* ^:[^:] == \.0 and [^:]::[^:] == 0\.0 and [^:]:$ == 0\.0 */
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if (!i || (*(this_i + 1) == ':') || (i == path_len-1)) {
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new_list = xrealloc(new_list, path_len += 1);
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if (i) {
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memmove(&new_list[i+2], &path_list[i+1], path_len-i);
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new_list[i+1] = '.';
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memmove(new_list, path_list, i);
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} else {
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memmove(&new_list[i+1], &path_list[i], path_len-i);
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new_list[i] = '.';
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}
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path_list = new_list;
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}
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}
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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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while (argc-- > 0) {
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struct stat stat_b;
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char *buf;
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char *path_n;
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char found = 0;
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#define is_executable_file(a, b) (!access(a,X_OK) && !stat(a, &b) && \
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S_ISREG(b.st_mode))
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argv++;
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path_n = path_list;
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buf = *argv;
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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, '/') != NULL && is_executable_file(buf, stat_b)) {
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found = 1;
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} else {
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/* Couldn't access file and file doesn't contain slashes */
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for (i = 0; i < count; i++) {
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buf = concat_path_file(path_n, *argv);
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if (is_executable_file(buf, stat_b)) {
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found = 1;
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break;
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}
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free(buf);
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path_n += (strlen(path_n) + 1);
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}
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}
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if (found) {
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puts(buf);
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} else {
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status = EXIT_FAILURE;
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}
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}
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bb_fflush_stdout_and_exit(status);
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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