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

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// By aaronwl 2003-01-28 for mingw-msvcrt
// Public domain: all copyrights disclaimed, absolutely no warranties */
#include <stdarg.h>
#include <stdio.h>
int vfscanf(FILE * __restrict__ stream, 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" // stream
"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 fscanf
"call _fscanf\n\t"
// restore stack
"movl %%ebx, %%esp\n\t"
: "=a"(ret), "=c"(stream), "=d"(format)
: "1"(stream), "2"(format), "S"(arg),
"a"(&ret)
: "ebx");
return ret;
}