shared_func.h: add function starts_with and ends_with

HISTORY

@@ -1,7 +1,8 @@
 
-Version 1.39  2018-07-07
+Version 1.39  2018-07-10
   * add #@function REPLACE_VARS
   * #@set value can embed %{VARIABLE}
+  * shared_func.h: add function starts_with and ends_with
 
 Version 1.38  2018-06-26
   * connection_pool.c: set err_no to 0 when success

src/shared_func.c

@@ -2633,3 +2633,33 @@ const char *long2str(const int64_t n, char *buff, const bool thousands_separator
     }
     return buff;
 }
+
+bool starts_with(const char *str, const char *needle)
+{
+    int str_len;
+    int needle_len;
+
+    str_len = strlen(str);
+    needle_len = strlen(needle);
+    if (needle_len > str_len) {
+        return false;
+    }
+
+    return memcmp(str, needle, needle_len) == 0;
+}
+
+bool ends_with(const char *str, const char *needle)
+{
+    int str_len;
+    int needle_len;
+    int start_offset;
+
+    str_len = strlen(str);
+    needle_len = strlen(needle);
+    start_offset = str_len - needle_len;
+    if (start_offset < 0) {
+        return false;
+    }
+
+    return memcmp(str + start_offset, needle, needle_len) == 0;
+}

src/shared_func.h

@@ -756,6 +756,22 @@ static inline const char *long_to_comma_str(const int64_t n, char *buff)
     return long2str(n, buff, true);
 }
 
+/** if the string starts with the needle string
+ *  parameters:
+ *  	str: the string to detect
+ *      needle: the needle string
+ *  return: true for starts with the needle string, otherwise false
+*/
+bool starts_with(const char *str, const char *needle);
+
+/** if the string ends with the needle string
+ *  parameters:
+ *  	str: the string to detect
+ *      needle: the needle string
+ *  return: true for ends with the needle string, otherwise false
+*/
+bool ends_with(const char *str, const char *needle);
+
 #ifdef __cplusplus
 }
 #endif