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/* ungetc( int, FILE * )
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>
#ifndef REGTEST
#ifndef __STDC_NO_THREADS__
#include <threads.h>
#endif
int ungetc( int c, struct _PDCLIB_file_t * stream )
{
int rc;
_PDCLIB_LOCK( stream->mtx );
if ( c == EOF || stream->ungetidx == _PDCLIB_UNGETCBUFSIZE )
{
rc = -1;
}
else
{
rc = stream->ungetbuf[stream->ungetidx++] = ( unsigned char ) c;
}
_PDCLIB_UNLOCK( stream->mtx );
return rc;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
#include <stdlib.h>
int main( void )
{
char buffer[4];
char input[1];
FILE * fh;
int read;
fpos_t pos;
TESTCASE( ( fh = tmpfile() ) != NULL );
TESTCASE( setvbuf( fh, buffer, _IOLBF, 4 ) == 0 );
rewind( fh );
TESTCASE( fprintf( fh, "123" ) == 3 );
TESTCASE( ftell( fh ) == 3 );
rewind( fh );
TESTCASE( fscanf( fh, "12%n", &read ) == 0 );
TESTCASE( read == 2 );
TESTCASE( ftell( fh ) == 2 );
TESTCASE( ungetc( 'x', fh ) == 'x' );
TESTCASE( ftell( fh ) == 1 );
read = 0;
TESTCASE( fscanf( fh, "x3%n", &read ) == 0 );
TESTCASE( ftell( fh ) == 3 );
TESTCASE( read == 2 );
TESTCASE( ungetc( 'y', fh ) == 'y' );
TESTCASE( ftell( fh ) == 2 );
TESTCASE( fread( input, 1, 1, fh ) == 1 );
TESTCASE( ftell( fh ) == 3 );
TESTCASE( input[0] == 'y' );
rewind( fh );
TESTCASE( ungetc( 'z', fh ) == 'z' );
TESTCASE( ftell( fh ) == -1 );
TESTCASE( fread( input, 1, 4, fh ) == 4 );
TESTCASE( memcmp( input, "z123", 4 ) == 0 );
rewind( fh );
TESTCASE( ungetc( 'z', fh ) == 'z' );
TESTCASE( ftell( fh ) == -1 );
TESTCASE( fscanf( fh, "%4c", input ) == 1 );
TESTCASE( memcmp( input, "z123", 4 ) == 0 );
rewind( fh );
TESTCASE( fgetc( fh ) == '1' );
TESTCASE( ftell( fh ) == 1 );
TESTCASE( ungetc( 'z', fh ) == 'z' );
TESTCASE( ftell( fh ) == 0 );
TESTCASE( fgetpos( fh, &pos ) == 0 );
TESTCASE( fsetpos( fh, &pos ) == 0 );
TESTCASE( ftell( fh ) == 0 );
TESTCASE( fgetc( fh ) == '1' );
TESTCASE( fclose( fh ) == 0 );
return TEST_RESULTS;
}
#endif
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