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vsscanf.c
/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
//  By aaronwl 2003-01-28 for mingw-msvcrt.
//  Public domain: all copyrights disclaimed, absolutely no warranties.

#include <stdarg.h>
#include <stdio.h>

#define QUOTE_(x) #x
#define QUOTE(x) QUOTE_(x)

int vsscanf(const char * __restrict__ s, const char * __restrict__ format, va_list arg) {
  int ret;
#ifdef _WIN64
  __asm__ __volatile__ (

    // allocate stack (esp += frame - arg3 - (8[arg1,2] + 12))
    "movq   %%rsp, %%rbx\n\t"
    "lea    0xFFFFFFFFFFFFFFD8(%%rsp, %6), %%rsp\n\t"
    "subq   %5, %%rsp\n\t"

    // set up stack
    "movq   %1, 0x18(%%rsp)\n\t"  // s
    "movq   %2, 0x20(%%rsp)\n\t"  // format
    "lea    0x28(%%rsp), %%rdi\n\t"
    "movq   %%rdi, (%%rsp)\n\t"  // memcpy dest
    "movq   %5, 0x8(%%rsp)\n\t"  // memcpy src
    "movq   %5, 0x10(%%rsp)\n\t"
    "subq   %6, 0x10(%%rsp)\n\t"  // memcpy len
    "movq   0x10(%%rsp), %%r8\n\t"
    "movq   0x8(%%rsp), %%rdx\n\t"
    "movq   (%%rsp),  %%rcx\n\t"
    "call   " QUOTE(__MINGW_USYMBOL(memcpy)) "\n\t"
    "addq   $24, %%rsp\n\t"

    // call sscanf
    "movq   0x18(%%rsp), %%r9\n\t"
    "movq   0x10(%%rsp), %%r8\n\t"
    "movq   0x8(%%rsp), %%rdx\n\t"
    "movq   (%%rsp),  %%rcx\n\t"
    "call   " QUOTE(__MINGW_USYMBOL(sscanf)) "\n\t"

    // restore stack
    "movq   %%rbx, %%rsp\n\t"

    : "=a"(ret), "=c"(s), "=d"(format)
    : "1"(s), "2"(format), "S"(arg),
      "a"(&ret)
    : "rbx", "rdi");
#else
  __asm__ __volatile__ (

    // 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   " QUOTE(__MINGW_USYMBOL(memcpy)) "\n\t"
    "addl   $12, %%esp\n\t"

    // call sscanf
    "call   " QUOTE(__MINGW_USYMBOL(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", "edi");
#endif

  return ret;
}

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