busybox/debianutils/which.c

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