106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/* strtok( 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 * strtok( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2 )
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{
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static char * tmp = NULL;
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const char * p = s2;
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if ( s1 != NULL )
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{
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/* new string */
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tmp = s1;
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}
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else
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{
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/* old string continued */
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if ( tmp == NULL )
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{
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/* No old string, no new string, nothing to do */
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return NULL;
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}
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s1 = tmp;
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}
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/* skipping leading s2 characters */
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while ( *p && *s1 )
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{
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if ( *s1 == *p )
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{
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/* found seperator; skip and start over */
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++s1;
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p = s2;
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continue;
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}
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++p;
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}
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if ( ! *s1 )
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{
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/* no more to parse */
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return ( tmp = NULL );
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}
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/* skipping non-s2 characters */
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tmp = s1;
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while ( *tmp )
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{
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p = s2;
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while ( *p )
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{
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if ( *tmp == *p++ )
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{
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/* found seperator; overwrite with '\0', position tmp, return */
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*tmp++ = '\0';
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return s1;
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}
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}
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++tmp;
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}
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/* parsed to end of string */
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tmp = NULL;
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return s1;
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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[] = "_a_bc__d_";
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TESTCASE( strtok( s, "_" ) == &s[1] );
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TESTCASE( s[1] == 'a' );
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TESTCASE( s[2] == '\0' );
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TESTCASE( strtok( NULL, "_" ) == &s[3] );
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TESTCASE( s[3] == 'b' );
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TESTCASE( s[4] == 'c' );
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TESTCASE( s[5] == '\0' );
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TESTCASE( strtok( NULL, "_" ) == &s[7] );
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TESTCASE( s[6] == '_' );
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TESTCASE( s[7] == 'd' );
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TESTCASE( s[8] == '\0' );
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TESTCASE( strtok( NULL, "_" ) == NULL );
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strcpy( s, "ab_cd" );
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TESTCASE( strtok( s, "_" ) == &s[0] );
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TESTCASE( s[0] == 'a' );
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TESTCASE( s[1] == 'b' );
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TESTCASE( s[2] == '\0' );
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TESTCASE( strtok( NULL, "_" ) == &s[3] );
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TESTCASE( s[3] == 'c' );
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TESTCASE( s[4] == 'd' );
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TESTCASE( s[5] == '\0' );
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TESTCASE( strtok( NULL, "_" ) == NULL );
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return TEST_RESULTS;
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}
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#endif
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