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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "stdio_impl.h"
#include "__scanf.h"
static void f_read(rctx_t *r)
{
FILE *f = r->opaque;
if ((r->c = __uflow(f)) >= 0) r->l++;
}
int vfscanf(FILE *f, const char *fmt, va_list ap)
{
size_t l = strlen(fmt), i, result;
rctx_t r = { f_read, (void *)f, 0, isspace };
wchar_t fmt2[l+1];
if (l > 0x100000) {
errno = ENOMEM;
return -1;
}
for (i=0; i<=l; i++) fmt2[i] = (unsigned char)fmt[i];
FLOCK(f);
result = __scanf(&r, fmt2, ap);
if (r.u && r.c >= 0) {
/* This code takes care of the case where the caller performs
* a nonmatching scanf to leave a character in the unscan
* buffer, followed by an unget, followed by a scanf that
* matches zero characters. In this case the final 'unread'
* character must be returned to the unget buffer rather than
* the unscan buffer. */
f->rpos--;
}
FUNLOCK(f);
return result;
}
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