68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* ungetc( int, 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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#ifndef REGTEST
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#include "_PDCLIB_io.h"
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int _PDCLIB_ungetc_unlocked( int c, FILE * stream )
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{
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if ( c == EOF || stream->ungetidx == _PDCLIB_UNGETCBUFSIZE )
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{
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return -1;
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}
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return stream->ungetbuf[stream->ungetidx++] = (unsigned char) c;
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}
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int ungetc( int c, FILE * stream )
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{
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_PDCLIB_flockfile( stream );
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int r = _PDCLIB_ungetc_unlocked( c, stream );
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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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#include "_PDCLIB_test.h"
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#include <stdlib.h>
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const char* hellostr = "Hello, world!";
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int main( void )
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{
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// Also see ftell() for some testing
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// PDCLIB-18: fread ignores ungetc
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size_t bufsz = strlen( hellostr ) + 1;
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char * buf = malloc( bufsz );
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FILE * fh;
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// Also fgets
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TESTCASE( ( fh = tmpfile() ) != NULL );
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TESTCASE( fputs(hellostr, fh) == 0 );
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rewind(fh);
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TESTCASE( fgetc( fh ) == 'H' );
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TESTCASE( ungetc( 'H', fh ) == 'H' );
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TESTCASE( fgets( buf, bufsz, fh ) != NULL );
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TESTCASE( strcmp( buf, hellostr ) == 0 );
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// fread
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rewind(fh);
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TESTCASE( fgetc( fh ) == 'H' );
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TESTCASE( ungetc( 'H', fh ) == 'H' );
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TESTCASE( fread( buf, bufsz - 1, 1, fh ) == 1 );
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TESTCASE( strncmp( buf, hellostr, bufsz - 1 ) == 0 );
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return TEST_RESULTS;
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}
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#endif
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