56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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/* strncmp( const char *, const char *, 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 <string.h>
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#ifndef REGTEST
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int strncmp( const char * s1, const char * s2, size_t n )
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{
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while ( n && *s1 && ( *s1 == *s2 ) )
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{
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++s1;
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++s2;
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--n;
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}
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if ( n == 0 )
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{
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return 0;
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}
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else
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{
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return ( *( unsigned char * )s1 - * ( unsigned char * )s2 );
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}
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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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char cmpabcde[] = "abcde\0f";
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char cmpabcd_[] = "abcde\xfc";
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char empty[] = "";
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char x[] = "x";
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TESTCASE( strncmp( abcde, cmpabcde, 5 ) == 0 );
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TESTCASE( strncmp( abcde, cmpabcde, 10 ) == 0 );
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TESTCASE( strncmp( abcde, abcdx, 5 ) < 0 );
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TESTCASE( strncmp( abcdx, abcde, 5 ) > 0 );
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TESTCASE( strncmp( empty, abcde, 5 ) < 0 );
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TESTCASE( strncmp( abcde, empty, 5 ) > 0 );
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TESTCASE( strncmp( abcde, abcdx, 4 ) == 0 );
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TESTCASE( strncmp( abcde, x, 0 ) == 0 );
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TESTCASE( strncmp( abcde, x, 1 ) < 0 );
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TESTCASE( strncmp( abcde, cmpabcd_, 10 ) < 0 );
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return TEST_RESULTS;
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}
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#endif
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