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authorJakob Kaivo <jkk@ung.org>2019-03-13 21:24:02 -0400
committerJakob Kaivo <jkk@ung.org>2019-03-13 21:24:02 -0400
commit2544614e0f9edb11814c3db8bfb848d8685c9c60 (patch)
tree9d07ab5d0e4846e0dec29076d86d7d548cdb1b5b
migrate to gitlab
-rw-r--r--env.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/env.c b/env.c
new file mode 100644
index 0000000..9ba2d05
--- /dev/null
+++ b/env.c
@@ -0,0 +1,63 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2011-2017, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define UTILITY_NOT_INVOKED (126)
+#define UTILITY_NOT_FOUND (127)
+
+extern char **environ;
+
+int main(int argc, char *argv[])
+{
+ int c;
+ while ((c = getopt(argc, argv, "i")) != -1) {
+ switch (c) {
+ case 'i': /** ignore inherited environment **/
+ environ = NULL;
+ break;
+
+ default:
+ return 1;
+ }
+ }
+
+ while (argv[optind] && strchr(argv[optind], '=')) {
+ putenv(argv[optind++]);
+ }
+
+ if (optind >= argc) {
+ if (environ) {
+ for (int i = 0; environ[i]; i++) {
+ puts(environ[i]);
+ }
+ }
+ return 0;
+ }
+
+ execvp(argv[optind], argv + optind);
+
+ fprintf(stderr, "env: Couldn't run '%s': %s\n", argv[optind], strerror(errno));
+ return errno == ENOENT ? UTILITY_NOT_FOUND : UTILITY_NOT_INVOKED;
+}