From a6e6ecc31e7a6d54573122f611c9ded18f2b41d6 Mon Sep 17 00:00:00 2001
From: Nathan Wagner <nw@hydaspes.if.org>
Date: Sat, 25 Apr 2015 20:49:56 +0000
Subject: [PATCH] implemented env

---
 utils/env/env.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 utils/env/env.c

diff --git a/utils/env/env.c b/utils/env/env.c
new file mode 100644
index 0000000..f3ec296
--- /dev/null
+++ b/utils/env/env.c
@@ -0,0 +1,61 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Public domain by Nathan Wagner */
+
+extern char **environ;
+
+static void printenv() {
+	char **env;
+	for (env = environ; *env; env++) {
+		printf("%s\n", *env);
+	}
+}
+
+static void clearenv() {
+	char var[1024]; /* TODO how long can the name be ? */
+	char *s;
+	int i;
+
+	while (*environ) {
+		i = 0;
+		s = *environ;
+		while (*s && *s != '=') {
+			var[i++] = *s++;
+		}
+		var[i] = 0;
+		unsetenv(var);
+	}
+}
+
+int main(int ac, char *av[]) {
+	int arg;
+	arg = 1;
+	if (arg < ac && !strcmp(av[arg], "-i")) {
+		clearenv();
+		arg++;
+	}
+	while (arg < ac) {
+		char *eq;
+		eq = strchr(av[arg], '=');
+		if (eq) {
+			*eq = 0;
+			setenv(av[arg], eq+1, 1);
+			*eq = '=';
+		} else {
+			break;
+		}
+		arg++;
+	}
+
+	if (arg >= ac) {
+		printenv();
+		return 0;
+	}
+
+	execvp(av[arg], &av[arg]);
+	return 0;
+}
-- 
2.40.0