50 lines
985 B
C
50 lines
985 B
C
/* strstr( const char *, const char * )
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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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char * strstr( const char * s1, const char * s2 )
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{
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const char * p1 = s1;
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const char * p2;
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while ( *s1 )
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{
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p2 = s2;
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while ( *p2 && ( *p1 == *p2 ) )
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{
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++p1;
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++p2;
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}
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if ( ! *p2 )
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{
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return (char *) s1;
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}
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++s1;
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p1 = s1;
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}
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return NULL;
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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 s[] = "abcabcabcdabcde";
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TESTCASE( strstr( s, "x" ) == NULL );
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TESTCASE( strstr( s, "xyz" ) == NULL );
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TESTCASE( strstr( s, "a" ) == &s[0] );
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TESTCASE( strstr( s, "abc" ) == &s[0] );
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TESTCASE( strstr( s, "abcd" ) == &s[6] );
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TESTCASE( strstr( s, "abcde" ) == &s[10] );
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return TEST_RESULTS;
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}
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#endif
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