Initial revision

lib/escape.c

@@ -0,0 +1,111 @@
+/*****************************************************************************
+ *                                  _   _ ____  _     
+ *  Project                     ___| | | |  _ \| |    
+ *                             / __| | | | |_) | |    
+ *                            | (__| |_| |  _ <| |___ 
+ *                             \___|\___/|_| \_\_____|
+ *
+ *  The contents of this file are subject to the Mozilla Public License
+ *  Version 1.0 (the "License"); you may not use this file except in
+ *  compliance with the License. You may obtain a copy of the License at
+ *  http://www.mozilla.org/MPL/
+ *
+ *  Software distributed under the License is distributed on an "AS IS"
+ *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+ *  License for the specific language governing rights and limitations
+ *  under the License.
+ *
+ *  The Original Code is Curl.
+ *
+ *  The Initial Developer of the Original Code is Daniel Stenberg.
+ *
+ *  Portions created by the Initial Developer are Copyright (C) 1998.
+ *  All Rights Reserved.
+ *
+ * ------------------------------------------------------------
+ * Main author:
+ * - Daniel Stenberg <Daniel.Stenberg@haxx.nu>
+ *
+ * 	http://curl.haxx.nu
+ *
+ * $Source$
+ * $Revision$
+ * $Date$
+ * $Author$
+ * $State$
+ * $Locker$
+ *
+ * ------------------------------------------------------------
+ ****************************************************************************/
+
+/* Escape and unescape URL encoding in strings. The functions return a new
+ * allocated string or NULL if an error occurred.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *curl_escape(char *string)
+{
+   int alloc=strlen(string);
+   char *ns = malloc(alloc);
+   unsigned char in;
+   int newlen = alloc;
+   int index=0;
+
+   while(*string) {
+      in = *string;
+      if(' ' == in)
+	 ns[index++] = '+';
+      else if(!(in >= 'a' && in <= 'z') &&
+	      !(in >= 'A' && in <= 'Z') &&
+	      !(in >= '0' && in <= '9')) {
+	 /* encode it */
+	 newlen += 2; /* the size grows with two, since this'll become a %XX */
+	 if(newlen > alloc) {
+	    alloc *= 2;
+	    ns = realloc(ns, alloc);
+	    if(!ns)
+	       return NULL;
+	 }
+	 sprintf(&ns[index], "%%%02X", in);
+	 index+=3;
+      }
+      else {
+	 /* just copy this */
+	 ns[index++]=in;
+      }
+      string++;
+   }
+   ns[index]=0; /* terminate it */
+   return ns;
+}
+
+char *curl_unescape(char *string)
+{
+   int alloc = strlen(string);
+   char *ns = malloc(alloc);
+   unsigned char in;
+   int index=0;
+   int hex;
+   
+
+   while(*string) {
+      in = *string;
+      if('+' == in)
+	 in = ' ';
+      else if('%' == in) {
+	 /* encoded part */
+	 if(sscanf(string+1, "%02X", &hex)) {
+	    in = hex;
+	    string+=2;
+	 }
+      }
+
+      ns[index++] = in;
+      string++;
+   }
+   ns[index]=0; /* terminate it */
+   return ns;
+  
+}