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[prss.git] / src / url.c

diff --git a/src/url.c b/src/url.c
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+++ b/src/url.c
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+/*
+ * Copyright (C) 2010-2013 jeanfi@gmail.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+/*
+ * Part of the following code is based on:
+ * http://www.geekhideout.com/urlcode.shtml
+ */
+#include "url.h"
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *url_normalize(const char *url)
+{
+       int n = strlen(url);
+       char *ret = strdup(url);
+
+       if (url[n - 1] == '/')
+               ret[n - 1] = '\0';
+
+       return ret;
+}
+
+static char to_hex(char code)
+{
+       static const char hex[] = "0123456789abcdef";
+       return hex[code & 0x0f];
+}
+
+/*
+ * Returns a url-encoded version of str.
+ */
+char *url_encode(const char *str)
+{
+       char *c, *buf, *pbuf;
+
+       buf = malloc(strlen(str) * 3 + 1);
+       pbuf = buf;
+
+       c = (char *)str;
+
+       while (*c) {
+
+               if (isalnum(*c) ||
+                   *c == '.' || *c == '_' || *c == '-' || *c == '~')
+                       *pbuf++ = *c;
+               else {
+                       *pbuf++ = '%';
+                       *pbuf++ = to_hex(*c >> 4);
+                       *pbuf++ = to_hex(*c & 0x0f);
+               }
+               c++;
+       }
+       *pbuf = '\0';
+
+       return buf;
+}