102 lines
1.6 KiB
C
102 lines
1.6 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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static int aflag;
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static int
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canexec(int fd, const char *name)
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{
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struct stat st;
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if (fstatat(fd, name, &st, 0) < 0 || !S_ISREG(st.st_mode))
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return 0;
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return faccessat(fd, name, X_OK, AT_EACCESS) == 0;
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}
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static int
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which(const char *path, const char *name)
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{
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char *ptr, *p;
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size_t i, len;
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int dirfd, found = 0;
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if (strchr(name, '/')) {
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found = canexec(AT_FDCWD, name);
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if (found)
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puts(name);
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return found;
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}
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ptr = p = enstrdup(3, path);
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len = strlen(p);
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for (i = 0; i < len + 1; i++) {
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if (ptr[i] != ':' && ptr[i] != '\0')
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continue;
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ptr[i] = '\0';
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if ((dirfd = open(p, O_RDONLY)) >= 0) {
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if (canexec(dirfd, name)) {
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found = 1;
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fputs(p, stdout);
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if (i && ptr[i - 1] != '/')
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fputc('/', stdout);
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puts(name);
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}
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close(dirfd);
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if (!aflag && found)
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break;
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}
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p = ptr + i + 1;
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}
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free(ptr);
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return found;
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-a] name ...\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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char *path;
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int found = 0, foundall = 1;
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ARGBEGIN {
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case 'a':
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aflag = 1;
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break;
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default:
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usage();
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} ARGEND
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if (!argc)
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usage();
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if (!(path = getenv("PATH")))
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enprintf(3, "$PATH is not set\n");
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for (; *argv; argc--, argv++) {
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if (which(path, *argv)) {
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found = 1;
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} else {
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weprintf("%s: not an external command\n", *argv);
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foundall = 0;
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}
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}
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return found ? foundall ? 0 : 1 : 2;
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}
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