From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 12 Feb 2011 00:22:29 -0500
Subject: initial check-in, version 0.5.0

---
 src/env/putenv.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/env/putenv.c

(limited to 'src/env/putenv.c')

diff --git a/src/env/putenv.c b/src/env/putenv.c
new file mode 100644
index 00000000..181a4181
--- /dev/null
+++ b/src/env/putenv.c
@@ -0,0 +1,59 @@
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+extern char **__environ;
+char **__env_map;
+
+int __putenv(char *s, int a)
+{
+	int i=0, j=0;
+	char *end = strchr(s, '=');
+	size_t l = end-s+1;
+	char **newenv = 0;
+	char **newmap = 0;
+	static char **oldenv;
+	
+	if (!end || l == 1) return -1;
+	for (; __environ[i] && memcmp(s, __environ[i], l); i++);
+	if (a) {
+		if (!__env_map) {
+			__env_map = calloc(2, sizeof(char *));
+			if (__env_map) __env_map[0] = s;
+		} else {
+			for (; __env_map[j] && __env_map[j] != __environ[i]; j++);
+			if (!__env_map[j]) {
+				newmap = realloc(__env_map, sizeof(char *)*(j+2));
+				if (newmap) {
+					__env_map = newmap;
+					__env_map[j] = s;
+					__env_map[j+1] = NULL;
+				}
+			} else {
+				free(__env_map[j]);
+			}
+		}
+	}
+	if (!__environ[i]) {
+		newenv = malloc(sizeof(char *)*(i+2));
+		if (!newenv) {
+			if (a && __env_map) __env_map[j] = 0;
+			return -1;
+		}
+		memcpy(newenv, __environ, sizeof(char *)*i);
+		newenv[i] = s;
+		newenv[i+1] = 0;
+		__environ = newenv;
+		free(oldenv);
+		oldenv = __environ;
+	}
+
+	__environ[i] = s;
+	return 0;
+}
+
+int putenv(char *s)
+{
+	return __putenv(s, 0);
+}
-- 
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