added zap_strndup

git-svn-id: http://svn.openzap.org/svn/openzap/branches/sangoma_boost@928 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/freetdm/src/include/openzap.h

@@ -652,6 +652,7 @@ OZ_DECLARE(zap_status_t) zap_global_set_queue_handler(zap_queue_handler_t *handl
 
 /*! \brief Duplicate string */
 OZ_DECLARE(char *) zap_strdup(const char *str);
+OZ_DECLARE(char *) zap_strndup(const char *str, zap_size_t inlen);
 
 OZ_DECLARE(zap_size_t) zap_fsk_modulator_generate_bit(zap_fsk_modulator_t *fsk_trans, int8_t bit, int16_t *buf, zap_size_t buflen);
 OZ_DECLARE(int32_t) zap_fsk_modulator_generate_carrier_bits(zap_fsk_modulator_t *fsk_trans, uint32_t bits);

libs/freetdm/src/zap_io.c

@@ -3252,6 +3252,24 @@ OZ_DECLARE(char *) zap_strdup(const char *str)
 	return (char *)memcpy(new, str, len);
 }
 
+OZ_DECLARE(char *) zap_strndup(const char *str, zap_size_t inlen)
+{
+	char *new = NULL;
+	zap_size_t len = strlen(str) + 1;
+	if (len > (inlen+1)) {
+		len = inlen+1;
+	}
+	new = (char *)zap_malloc(len);
+
+	if (!new) {
+		return NULL;
+	}
+	
+	memcpy(new, str, len-1);
+	new[len-1] = 0;
+	return new;
+}
+
 
 /* For Emacs:
  * Local Variables: