[utils] add url_encode() function

src/tvheadend.h

@@ -711,6 +711,10 @@ int rmtree ( const char *path );
 
 char *regexp_escape ( const char *str );
 
+/* URL decoding */
+char to_hex(char code);
+char *url_encode(char *str);
+
 static inline int32_t deltaI32(int32_t a, int32_t b) { return (a > b) ? (a - b) : (b - a); }
 static inline uint32_t deltaU32(uint32_t a, uint32_t b) { return (a > b) ? (a - b) : (b - a); }
 

src/utils.c

@@ -25,6 +25,7 @@
 #include <sys/types.h>
 #include <dirent.h>
 #include <unistd.h>
+#include <ctype.h>
 #include "tvheadend.h"
 
 #if defined(PLATFORM_DARWIN)
@@ -588,3 +589,29 @@ regexp_escape(const char* str)
   *b = 0;
   return tmp;
 }
+
+/* Converts an integer value to its hex character
+   http://www.geekhideout.com/urlcode.shtml */
+char to_hex(char code) {
+  static char hex[] = "0123456789abcdef";
+  return hex[code & 15];
+}
+
+/* Returns a url-encoded version of str
+   IMPORTANT: be sure to free() the returned string after use
+   http://www.geekhideout.com/urlcode.shtml */
+char *url_encode(char *str) {
+  char *pstr = str, *buf = malloc(strlen(str) * 3 + 1), *pbuf = buf;
+  while (*pstr) {
+    if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~') 
+      *pbuf++ = *pstr;
+    /*else if (*pstr == ' ') 
+      *pbuf++ = '+';*/
+    else 
+      *pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(*pstr & 15);
+    pstr++;
+  }
+  *pbuf = '\0';
+  return buf;
+}
+