82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
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/* _PDCLIB_load_lines( FILE *, size_t )
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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 <stdlib.h>
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#ifndef REGTEST
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char * _PDCLIB_load_lines( FILE * fh, size_t lines )
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{
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size_t required = 0;
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long pos = ftell( fh );
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char * rc = NULL;
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int c;
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/* Count the number of characters */
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while ( lines && ( c = fgetc( fh ) ) != EOF )
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{
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if ( c == '\n' )
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{
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--lines;
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}
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++required;
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}
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if ( ! feof( fh ) )
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{
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if ( ( rc = (char *)malloc( required ) ) != NULL )
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{
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size_t i;
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fseek( fh, pos, SEEK_SET );
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fread( rc, 1, required, fh );
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for ( i = 0; i < required; ++i )
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{
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if ( rc[ i ] == '\n' )
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{
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rc[ i ] = '\0';
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}
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}
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}
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}
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return rc;
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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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int main( void )
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{
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#ifndef REGTEST
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FILE * fh = fopen( "test_lines.txt", "w+" );
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char * rc;
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TESTCASE( fh != NULL );
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TESTCASE( fputs( "Foo\n\nBar\n", fh ) != EOF );
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rewind( fh );
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rc = _PDCLIB_load_lines( fh, 3 );
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fclose( fh );
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remove( "test_lines.txt" );
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TESTCASE( rc != NULL );
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TESTCASE( strcmp( rc, "Foo" ) == 0 );
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TESTCASE( strcmp( rc + 4, "" ) == 0 );
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TESTCASE( strcmp( rc + 5, "Bar" ) == 0 );
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#endif
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return TEST_RESULTS;
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}
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#endif
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