-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int vsscanf( const char * restrict s, const char * restrict format, va_list ap ) { /* TODO */ };
+/* $Id$ */
+
+/* vsscanf( const char *, const char *, va_list arg )
+
+ 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>
+
+#ifndef REGTEST
+#include <ctype.h>
+
+int vsscanf( const char * _PDCLIB_restrict s, 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.this = 0;
+ status.s = (char *)s;
+ status.width = 0;
+ status.prec = 0;
+ status.stream = NULL;
+ va_copy( status.arg, arg );
+ while ( *format != '\0' )
+ {
+ const char * rc;
+ if ( ( *format != '%' ) || ( ( rc = _PDCLIB_scan( format, &status ) ) == format ) )
+ {
+ /* No conversion specifier, match verbatim */
+ if ( isspace( *format ) )
+ {
+ /* Whitespace char in format string: Skip all whitespaces */
+ /* No whitespaces in input do not result in matching error */
+ while ( isspace( *status.s ) )
+ {
+ ++status.s;
+ ++status.i;
+ }
+ }
+ else
+ {
+ /* Non-whitespace char in format string: Match verbatim */
+ if ( *status.s != *format )
+ {
+ /* Matching error */
+ return status.n;
+ }
+ else
+ {
+ ++status.s;
+ ++status.i;
+ }
+ }
+ ++format;
+ }
+ else
+ {
+ /* NULL return code indicates input 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 )
+{
+ char const * teststring1 = "abc def";
+ char const * teststring2 = "abcdef";
+ char const * teststring3 = "abc%def";
+ int x;
+ TESTCASE( sscanf( teststring2, "abcdef%n", &x ) == 0 );
+ TESTCASE( x == 6 );
+ TESTCASE( sscanf( teststring1, "abc def%n", &x ) == 0 );
+ TESTCASE( x == 8 );
+ TESTCASE( sscanf( teststring2, "abc def%n", &x ) == 0 );
+ TESTCASE( x == 6 );
+ TESTCASE( sscanf( teststring3, "abc%%def%n", &x ) == 0 );
+ TESTCASE( x == 7 );
+ return TEST_RESULTS;
+}
+
+#endif