Merge 5f9aaeddf9 into sapling-pr-archive-icex2

src/main/util/winerr.c

@@ -0,0 +1,38 @@
+#include <windows.h>
+
+#include "util/mem.h"
+#include "util/str.h"
+#include "util/winerr.h"
+
+char* util_winerr_format_last_error_code()
+{
+    return util_winerr_format_error_code(GetLastError());
+}
+
+char* util_winerr_format_error_code(int err_code)
+{
+    // Max size according to docs
+    char buffer[64 * 1024];
+    char *buffer_dyn;
+    DWORD format_flags;
+    DWORD language_id;
+    size_t len;
+
+    format_flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
+    language_id = MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US);
+
+    len = FormatMessageA(format_flags, NULL, err_code, language_id, buffer, sizeof(buffer), NULL);
+
+    if (len > 0) {
+        // Have this on the heap by don't use the dynamic allocation provided by
+        // the function because it's on a different heap and can't be free'd
+        // with free()
+        buffer_dyn = xmalloc(len);
+
+        str_cpy(buffer_dyn, len, buffer);
+
+        return buffer_dyn;
+    } else {
+        return NULL;
+    }
+}

src/main/util/winerr.h

@@ -0,0 +1,8 @@
+#ifndef UTIL_WINERR_H
+#define UTIL_WINERR_H
+
+char* util_winerr_format_last_error_code();
+
+char* util_winerr_format_error_code(int err_code);
+
+#endif