source: trunk/minix/commands/simple/env.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 1.7 KB
Line 
1/* env 1.1 - Set environment for command Author: Kees J. Bot
2 * 17 Dec 1997
3 */
4#define nil 0
5#include <sys/types.h>
6#include <stdio.h>
7#include <stdlib.h>
8#include <string.h>
9#include <unistd.h>
10#include <errno.h>
11
12int main(int argc, char **argv)
13{
14 int i;
15 int iflag= 0;
16 int aflag= 0;
17 extern char **environ;
18
19 i= 1;
20 while (i < argc && argv[i][0] == '-') {
21 char *opt= argv[i++] + 1;
22
23 if (opt[0] == '-' && opt[1] == 0) break; /* -- */
24
25 if (opt[0] == 0) iflag= 1; /* - */
26
27 while (*opt != 0) switch (*opt++) {
28 case 'i':
29 iflag= 1; /* Clear environment. */
30 break;
31 case 'a': /* Specify arg 0 separately. */
32 aflag= 1;
33 break;
34 default:
35 fprintf(stderr,
36 "Usage: env [-ia] [name=value] ... [utility [argument ...]]\n");
37 exit(1);
38 }
39 }
40
41 /* Clear the environment if -i. */
42 if (iflag) *environ= nil;
43
44 /* Set the new environment strings. */
45 while (i < argc && strchr(argv[i], '=') != nil) {
46 if (putenv(argv[i]) != 0) {
47 fprintf(stderr, "env: Setting '%s' failed: %s\n",
48 argv[i], strerror(errno));
49 exit(1);
50 }
51 i++;
52 }
53
54 /* Environment settings and command may be separated with '--'.
55 * This is for compatibility with other envs, we don't advertise it.
56 */
57 if (i < argc && strcmp(argv[i], "--") == 0) i++;
58
59 if (i >= argc) {
60 /* No utility given; print environment. */
61 char **ep;
62
63 for (ep= environ; *ep != nil; ep++) {
64 if (puts(*ep) == EOF) {
65 fprintf(stderr, "env: %s\n", strerror(errno));
66 exit(1);
67 }
68 }
69 return 0;
70 } else {
71 char *util, **args;
72 int err;
73
74 util= argv[i];
75 args= argv + i;
76 if (aflag) args++;
77 (void) execvp(util, args);
78 err= errno;
79 fprintf(stderr, "env: Can't execute %s: %s\n",
80 util, strerror(err));
81 return err == ENOENT ? 127 : 126;
82 }
83}
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