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