Added SDL_SetErrorV()

include/SDL3/SDL_error.h

@@ -82,9 +82,27 @@ extern "C" {
  *
  * \sa SDL_ClearError
  * \sa SDL_GetError
+ * \sa SDL_SetErrorV
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
 
+/**
+ * Set the SDL error message for the current thread.
+ *
+ * Calling this function will replace any previous error message that was set.
+ *
+ * \param fmt a printf()-style message format string.
+ * \param ap a variable argument list.
+ * \returns false.
+ *
+ * \since This function is available since SDL 3.1.6.
+ *
+ * \sa SDL_ClearError
+ * \sa SDL_GetError
+ * \sa SDL_SetError
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_SetErrorV(SDL_PRINTF_FORMAT_STRING const char *fmt, va_list ap) SDL_PRINTF_VARARG_FUNCV(1);
+
 /**
  * Set an error indicating that memory allocation failed.
  *

src/SDL_error.c

@@ -25,18 +25,29 @@
 #include "SDL_error_c.h"
 
 bool SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
+{
+    va_list ap;
+    bool result;
+
+    va_start(ap, fmt);
+    result = SDL_SetErrorV(fmt, ap);
+    va_end(ap);
+    return result;
+}
+
+bool SDL_SetErrorV(SDL_PRINTF_FORMAT_STRING const char *fmt, va_list ap)
 {
     // Ignore call if invalid format pointer was passed
     if (fmt) {
-        va_list ap;
         int result;
         SDL_error *error = SDL_GetErrBuf(true);
+        va_list ap2;
 
         error->error = SDL_ErrorCodeGeneric;
 
-        va_start(ap, fmt);
-        result = SDL_vsnprintf(error->str, error->len, fmt, ap);
-        va_end(ap);
+        va_copy(ap2, ap);
+        result = SDL_vsnprintf(error->str, error->len, fmt, ap2);
+        va_end(ap2);
 
         if (result >= 0 && (size_t)result >= error->len && error->realloc_func) {
             size_t len = (size_t)result + 1;
@@ -44,9 +55,9 @@ bool SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
             if (str) {
                 error->str = str;
                 error->len = len;
-                va_start(ap, fmt);
-                (void)SDL_vsnprintf(error->str, error->len, fmt, ap);
-                va_end(ap);
+                va_copy(ap2, ap);
+                (void)SDL_vsnprintf(error->str, error->len, fmt, ap2);
+                va_end(ap2);
             }
         }
 

src/dynapi/SDL_dynapi.sym

@@ -1179,6 +1179,7 @@ SDL3_0.0.0 {
     SDL_StepBackUTF8;
     SDL_DelayPrecise;
     SDL_CalculateGPUTextureFormatSize;
+    SDL_SetErrorV;
     # extra symbols go here (don't modify this line)
   local: *;
 };

src/dynapi/SDL_dynapi_overrides.h

@@ -1204,3 +1204,4 @@
 #define SDL_StepBackUTF8 SDL_StepBackUTF8_REAL
 #define SDL_DelayPrecise SDL_DelayPrecise_REAL
 #define SDL_CalculateGPUTextureFormatSize SDL_CalculateGPUTextureFormatSize_REAL
+#define SDL_SetErrorV SDL_SetErrorV_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -1210,3 +1210,4 @@ SDL_DYNAPI_PROC(long,SDL_wcstol,(const wchar_t *a, wchar_t **b, int c),(a,b,c),r
 SDL_DYNAPI_PROC(Uint32,SDL_StepBackUTF8,(const char *a, const char **b),(a,b),return)
 SDL_DYNAPI_PROC(void,SDL_DelayPrecise,(Uint64 a),(a),)
 SDL_DYNAPI_PROC(Uint32,SDL_CalculateGPUTextureFormatSize,(SDL_GPUTextureFormat a, Uint32 b, Uint32 c, Uint32 d),(a,b,c,d),return)
+SDL_DYNAPI_PROC(bool,SDL_SetErrorV,(SDL_PRINTF_FORMAT_STRING const char *a,va_list b),(a,b),return)