newlib-cygwin/winsup/mingw/mingwex/stdio/vsscanf.c

42 lines
1002 B
C

// 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", "edi");
return ret;
}