127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/* vfscanf( FILE *, const char *, va_list )
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This file is part of the Public Domain C Library (PDCLib).
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Permission is granted to use, modify, and / or redistribute at will.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <ctype.h>
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#ifndef REGTEST
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#include "_PDCLIB_io.h"
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int _PDCLIB_vfscanf_unlocked( FILE * _PDCLIB_restrict stream,
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const char * _PDCLIB_restrict format,
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va_list arg )
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{
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/* TODO: This function should interpret format as multibyte characters. */
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struct _PDCLIB_status_t status;
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status.base = 0;
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status.flags = 0;
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status.n = 0;
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status.i = 0;
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status.current = 0;
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status.s = NULL;
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status.width = 0;
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status.prec = 0;
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status.stream = stream;
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va_copy( status.arg, arg );
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while ( *format != '\0' )
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{
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const char * rc;
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if ( ( *format != '%' ) || ( ( rc = _PDCLIB_scan( format, &status ) ) == format ) )
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{
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int c;
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/* No conversion specifier, match verbatim */
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if ( isspace( *format ) )
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{
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/* Whitespace char in format string: Skip all whitespaces */
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/* No whitespaces in input does not result in matching error */
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while ( isspace( c = getc( stream ) ) )
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{
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++status.i;
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}
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if ( ! feof( stream ) )
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{
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_PDCLIB_ungetc_unlocked( c, stream );
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}
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}
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else
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{
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/* Non-whitespace char in format string: Match verbatim */
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if ( ( ( c = _PDCLIB_getc_unlocked( stream ) ) != *format ) || feof( stream ) )
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{
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/* Matching error */
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if ( ! feof( stream ) && ! ferror( stream ) )
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{
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_PDCLIB_ungetc_unlocked( c, stream );
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}
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else if ( status.n == 0 )
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{
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return EOF;
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}
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return status.n;
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}
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else
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{
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++status.i;
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}
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}
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++format;
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}
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else
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{
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/* NULL return code indicates matching error */
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if ( rc == NULL )
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{
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break;
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}
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/* Continue parsing after conversion specifier */
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format = rc;
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}
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}
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va_end( status.arg );
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return status.n;
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}
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int vfscanf( FILE * _PDCLIB_restrict stream,
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const char * _PDCLIB_restrict format,
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va_list arg )
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{
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_PDCLIB_flockfile( stream );
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int r = _PDCLIB_vfscanf_unlocked( stream, format, arg );
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_PDCLIB_funlockfile( stream );
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return r;
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}
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#endif
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#ifdef TEST
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#define _PDCLIB_FILEID "stdio/vfscanf.c"
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#define _PDCLIB_FILEIO
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#include "_PDCLIB_test.h"
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static int testscanf( FILE * stream, char const * format, ... )
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{
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va_list ap;
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va_start( ap, format );
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int result = vfscanf( stream, format, ap );
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va_end( ap );
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return result;
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}
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int main( void )
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{
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FILE * source;
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TESTCASE( ( source = tmpfile() ) != NULL );
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#include "scanf_testcases.h"
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TESTCASE( fclose( source ) == 0 );
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return TEST_RESULTS;
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}
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#endif
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