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authorErik Andersen <andersen@codepoet.org>2000-05-14 04:16:35 +0000
committerErik Andersen <andersen@codepoet.org>2000-05-14 04:16:35 +0000
commit64bc6412188b141c010ac3b8e813b837dd991e80 (patch)
treeffa12b79ea4b13191754f54b872eb1a4f9e3a04b /libc/stdlib/putenv.c
Initial revision
Diffstat (limited to 'libc/stdlib/putenv.c')
-rw-r--r--libc/stdlib/putenv.c62
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;
+}
+
+