81 lines
1.2 KiB
C
81 lines
1.2 KiB
C
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#include <sys/stat.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 "arg.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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which(const char *path, const char *name)
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{
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char file[PATH_MAX], *p, *s, *ptr;
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size_t len;
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struct stat st;
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int found = 0;
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p = ptr = estrdup(path);
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for (s = p; (s = strsep(&p, ":")); ) {
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if (!s[0])
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s = ".";
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len = strlen(s);
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if (snprintf(file, sizeof(file), "%s%s%s",
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s,
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len > 0 && s[len - 1] != '/' ? "/" : "",
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name) >= sizeof(file))
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eprintf("path too long\n");
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if (stat(file, &st) == 0 && S_ISREG(st.st_mode) &&
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access(file, X_OK) == 0) {
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found = 1;
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puts(file);
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if (!aflag)
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break;
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}
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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 i, found;
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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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eprintf("$PATH not set\n");
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for (i = 0, found = 0; i < argc; i++) {
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if (which(path, argv[i]))
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found++;
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else
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weprintf("%s: Command not found.\n", argv[i]);
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}
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return !found ? 2 : found == argc ? 0 : 1;
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}
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