Add fmt() native to format and return inline a string

amxmodx/string.cpp

@@ -1409,6 +1409,20 @@ static cell AMX_NATIVE_CALL vformat(AMX *amx, cell *params)
 }
 
 
+#define MAX_FMT_LENGTH 256
+
+// native [MAX_FMT_LENGTH] fmt(const fmt[], any:...)
+static cell AMX_NATIVE_CALL fmt(AMX *amx, cell *params)
+{
+	int length;
+	const char *string = format_amxstring(amx, params, 1, length);
+
+	size_t num_params = *params / sizeof(cell);
+
+	set_amxstring_utf8_char(amx, params[num_params + 1], string, length, MAX_FMT_LENGTH - 1);
+
+	return 1;
+};
 
 
 AMX_NATIVE_INFO string_Natives[] =
@@ -1420,6 +1434,7 @@ AMX_NATIVE_INFO string_Natives[] =
 	{"copyc",			copyc},
 	{"equal",			equal},
 	{"equali",			equali},
+	{"fmt",				fmt},
 	{"format",			format},
 	{"formatex",		formatex},
 	{"format_args",		format_args},

plugins/include/string.inc

@@ -25,6 +25,11 @@
  * 			copy(string, charsmax(string), ...)
  */
 
+/**
+ * Buffer size used by fmt().
+ */
+#define MAX_FMT_LENGTH 256
+
 /**
  * Calculates the length of a string.
  *
@@ -167,6 +172,23 @@ native format(output[], len, const format[], any:...);
  */
 native formatex(output[], len, const format[], any:...);
 
+/**
+ * Formats and returns a string according to the AMX Mod X format rules
+ * (see documentation).
+ *
+ * @note Example: menu_additem(menu, fmt("My first %s", "item")).
+ * @note This should only be used for simple inline formatting like in the above example.
+ *       Avoid using this function to store strings into variables as an additional
+ *       copying step is required.
+ * @note The buffer size is defined by MAX_FMT_LENGTH.
+ *
+ * @param format        Formatting rules.
+ * @param ...           Variable number of format parameters.
+ *
+ * @return              Formatted string
+ */
+native [MAX_FMT_LENGTH]fmt(const format[], any:...);
+
 /**
  * Formats a string according to the AMX Mod X format rules (see documentation).
  *