1 files changed, 62 insertions, 0 deletions
diff --git a/libc/stdlib/putenv.c b/libc/stdlib/putenv.c
new file mode 100644
index 000000000..a7a453d5f
--- /dev/null
+++ b/libc/stdlib/putenv.c
@@ -0,0 +1,62 @@
+/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
+ * This file is part of the Linux-8086 C library and is distributed
+ * under the GNU Library General Public License.
+ */
+#include <string.h>
+#include <stdlib.h>
+#include <malloc.h>
+
+extern char ** environ;
+#define ADD_NUM 4
+
+int
+putenv(var)
+const char * var;
+{
+static char ** mall_env = 0;
+static int extras = 0;
+   char **p, **d;
+   char * r;
+   int len;
+
+   r = strchr(var, '=');
+   if( r == 0 )  len = strlen(var);
+   else          len = r-var;
+
+   if (!environ) {
+   	environ = (char**)malloc(ADD_NUM * sizeof(char*));
+   	memset(environ, 0, sizeof(char*)*ADD_NUM);
+   	extras = ADD_NUM;
+   }
+   
+   for(p=environ; *p; p++)
+   {
+      if( memcmp(var, *p, len) == 0 && (*p)[len] == '=' )
+      {
+         while( p[0] = p[1] ) p++;
+         extras++;
+         break;
+      }
+   }
+   if( r == 0 ) return 0;
+   if( extras <= 0 )	/* Need more space */
+   {
+      d = malloc((p-environ+1+ADD_NUM)*sizeof(char*));
+      if( d == 0 ) return -1;
+
+      memcpy((void*) d, (void*) environ, (p-environ+1)*sizeof(char*));
+      p = d + (p-environ);
+      extras=ADD_NUM;
+
+      if( mall_env ) free(mall_env);
+      environ = d;
+      mall_env = d;
+   }
+   *p++ = strdup((char*)var);
+   *p = '\0';
+   extras--;
+
+   return 0;
+}
+
+