1 files changed, 41 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/stdio/vsscanf.c b/winsup/mingw/mingwex/stdio/vsscanf.c
new file mode 100644
index 000000000..33fd333ae
--- /dev/null
+++ b/winsup/mingw/mingwex/stdio/vsscanf.c
@@ -0,0 +1,41 @@
+//  By aaronwl 2003-01-28 for mingw-msvcrt.
+//  Public domain: all copyrights disclaimed, absolutely no warranties.
+
+#include <stdarg.h>
+#include <stdio.h>
+
+
+int vsscanf(const char * __restrict__ s, const char * __restrict__ format, va_list arg) {
+  int ret;
+
+  __asm__(
+
+    // allocate stack (esp += frame - arg3 - (8[arg1,2] + 12))
+    "movl	%%esp, %%ebx\n\t"
+    "lea	0xFFFFFFEC(%%esp, %6), %%esp\n\t"
+    "subl	%5, %%esp\n\t"
+
+    // set up stack
+    "movl	%1, 0xC(%%esp)\n\t"  // s
+    "movl	%2, 0x10(%%esp)\n\t"  // format
+    "lea	0x14(%%esp), %%edi\n\t"
+    "movl	%%edi, (%%esp)\n\t"  // memcpy dest
+    "movl	%5, 0x4(%%esp)\n\t"  // memcpy src
+    "movl	%5, 0x8(%%esp)\n\t"
+    "subl	%6, 0x8(%%esp)\n\t"  // memcpy len
+    "call	_memcpy\n\t"
+    "addl	$12, %%esp\n\t"
+
+    // call sscanf
+    "call	_sscanf\n\t"
+
+    // restore stack
+    "movl	%%ebx, %%esp\n\t"
+
+    : "=a"(ret), "=c"(s), "=d"(format)
+    : "1"(s), "2"(format), "S"(arg),
+      "a"(&ret)
+    : "ebx");
+
+  return ret;
+}