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/* vi: set sw=4 ts=4:
*
* which.c - Find executable files in $PATH.
*
* Copyright 2006 Rob landley <rob@landley.net>
*
* Not in SUSv3.
config WHICH
bool "which"
default y
help
usage: which [-a] filename ...
Search $PATH for executable files matching filename(s).
-a Show all matches
*/
#include "toys.h"
#define OPT_a 1
// Find an exectuable file either at a path with a slash in it (absolute or
// relative to current directory), or in $PATH. Returns absolute path to file,
// or NULL if not found.
static int which_in_path(char *filename)
{
struct string_list *list;
// If they gave us a path, don't worry about $PATH or -a
if (index(filename, '/')) {
// Confirm it has the executable bit set, and it's not a directory.
if (!access(filename, X_OK)) {
struct stat st;
if (!stat(filename, &st) && S_ISREG(st.st_mode)) {
puts(filename);
return 0;
}
return 1;
}
}
// Search $PATH for matches.
list = find_in_path(getenv("PATH"), filename);
if (!list) return 1;
// Print out matches
while (list) {
if (!access(list->str, X_OK)) {
puts(list->str);
// If we should stop at one match, do so
if (toys.optflags & OPT_a) {
llist_free(list, NULL);
break;
}
}
free(llist_pop(&list));
}
return 0;
}
void which_main(void)
{
if (!*toys.optargs) toys.exitval++;
else {
int i;
for (i=0; toys.optargs[i]; i++)
toys.exitval |= which_in_path(toys.optargs[i]);
}
}
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