97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* ftell( FILE * )
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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 <stdint.h>
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#include <limits.h>
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#include <errno.h>
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#ifndef REGTEST
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#include "_PDCLIB_io.h"
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long int _PDCLIB_ftell_unlocked( FILE * stream )
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{
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uint_fast64_t off64 = _PDCLIB_ftell64_unlocked( stream );
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if ( off64 > LONG_MAX )
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{
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/* integer overflow */
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errno = ERANGE;
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return -1;
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}
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return off64;
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}
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long int ftell( FILE * stream )
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{
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_PDCLIB_flockfile( stream );
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long int off = _PDCLIB_ftell_unlocked( stream );
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_PDCLIB_funlockfile( stream );
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return off;
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}
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#endif
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#ifdef TEST
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#include "_PDCLIB_test.h"
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#include <stdlib.h>
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#ifndef REGTEST
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#include "_PDCLIB_io.h"
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#endif
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int main( void )
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{
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/* Testing all the basic I/O functions individually would result in lots
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of duplicated code, so I took the liberty of lumping it all together
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here.
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*/
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/* The following functions delegate their tests to here:
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fgetc fflush rewind fputc ungetc fseek
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flushbuffer seek fillbuffer prepread prepwrite
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*/
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char * buffer = (char*)malloc( 4 );
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FILE * fh;
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TESTCASE( ( fh = tmpfile() ) != NULL );
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TESTCASE( setvbuf( fh, buffer, _IOLBF, 4 ) == 0 );
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/* Testing ungetc() at offset 0 */
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rewind( fh );
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TESTCASE( ungetc( 'x', fh ) == 'x' );
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TESTCASE( ftell( fh ) == -1l );
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rewind( fh );
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TESTCASE( ftell( fh ) == 0l );
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/* Commence "normal" tests */
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TESTCASE( fputc( '1', fh ) == '1' );
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TESTCASE( fputc( '2', fh ) == '2' );
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TESTCASE( fputc( '3', fh ) == '3' );
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/* Positions incrementing as expected? */
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TESTCASE( ftell( fh ) == 3l );
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TESTCASE_NOREG( fh->pos.offset == 0l );
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TESTCASE_NOREG( fh->bufidx == 3l );
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/* Buffer properly flushed when full? */
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TESTCASE( fputc( '4', fh ) == '4' );
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TESTCASE_NOREG( fh->pos.offset == 4l );
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TESTCASE_NOREG( fh->bufidx == 0 );
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/* fflush() resetting positions as expected? */
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TESTCASE( fputc( '5', fh ) == '5' );
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TESTCASE( fflush( fh ) == 0 );
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TESTCASE( ftell( fh ) == 5l );
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TESTCASE_NOREG( fh->pos.offset == 5l );
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TESTCASE_NOREG( fh->bufidx == 0l );
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/* rewind() resetting positions as expected? */
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rewind( fh );
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TESTCASE( ftell( fh ) == 0l );
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TESTCASE_NOREG( fh->pos.offset == 0 );
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TESTCASE_NOREG( fh->bufidx == 0 );
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/* Reading back first character after rewind for basic read check */
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TESTCASE( fgetc( fh ) == '1' );
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/* TODO: t.b.c. */
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TESTCASE( fclose( fh ) == 0 );
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return TEST_RESULTS;
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}
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#endif
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