X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fvfscanf.c;h=bf09226c16edb26b77e1b4355f064e236afbec40;hb=fb746c58bc267696133020d78116d52e7546a560;hp=a75870e27f5ff609311df3c81580f5171ea21006;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdio/vfscanf.c b/functions/stdio/vfscanf.c
index a75870e..bf09226 100644
--- a/functions/stdio/vfscanf.c
+++ b/functions/stdio/vfscanf.c
@@ -1,8 +1,92 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int vfscanf( FILE * restrict stream, const char * restrict format, va_list ap ) { /* TODO */ };
+/* $Id$ */
+
+/* vfscanf( FILE *, const char *, va_list )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <ctype.h>
+
+#ifndef REGTEST
+
+int vfscanf( FILE * _PDCLIB_restrict stream, const char * _PDCLIB_restrict format, va_list arg )
+{
+    struct _PDCLIB_status_t status;
+    status.base = 0;
+    status.flags = 0;
+    status.n = 0; 
+    status.i = 0;
+    status.current = 0;
+    status.s = NULL;
+    status.width = 0;
+    status.prec = 0;
+    status.stream = stream;
+    // = { 0, 0, 0, 0, 0, NULL, 0, 0, stream }
+    va_copy( status.arg, arg );
+    while ( *format != '\0' )
+    {
+        const char * rc;
+        if ( ( *format != '%' ) || ( ( rc = _PDCLIB_scan( format, &status ) ) == format ) )
+        {
+            int c;
+            /* No conversion specifier, match verbatim */
+            if ( isspace( *format ) )
+            {
+                /* Whitespace char in format string: Skip all whitespaces */
+                /* No whitespaces in input does not result in matching error */
+                while ( isspace( c = getc( stream ) ) )
+                {
+                    ++status.i;
+                }
+                if ( c != EOF )
+                {
+                    ungetc( c, stream );
+                }
+            }
+            else
+            {
+                /* Non-whitespace char in format string: Match verbatim */
+                if ( ( c = getc( stream ) ) != *format )
+                {
+                    /* Matching error */
+                    ungetc( c, stream );
+                    return status.n;
+                }
+                else
+                {
+                    ++status.i;
+                }
+            }
+            ++format;
+        }
+        else
+        {
+            /* NULL return code indicates matching error */
+            if ( rc == NULL )
+            {
+                break;
+            }
+            /* Continue parsing after conversion specifier */
+            format = rc;
+        }
+    }
+    va_end( status.arg );
+    return status.n;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* TODO: Check whitespace / EOF / ungetc handling */
+    TESTCASE( NO_TESTDRIVER );
+    return TEST_RESULTS;
+}
+
+#endif