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/* strtok( char *, const char * )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#include <string.h>
#ifndef REGTEST
char * strtok( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2 )
{
static char * tmp = NULL;
const char * p = s2;
if ( s1 != NULL )
{
/* new string */
tmp = s1;
}
else
{
/* old string continued */
if ( tmp == NULL )
{
/* No old string, no new string, nothing to do */
return NULL;
}
s1 = tmp;
}
/* skipping leading s2 characters */
while ( *p && *s1 )
{
if ( *s1 == *p )
{
/* found seperator; skip and start over */
++s1;
p = s2;
continue;
}
++p;
}
if ( ! *s1 )
{
/* no more to parse */
return ( tmp = NULL );
}
/* skipping non-s2 characters */
tmp = s1;
while ( *tmp )
{
p = s2;
while ( *p )
{
if ( *tmp == *p++ )
{
/* found seperator; overwrite with '\0', position tmp, return */
*tmp++ = '\0';
return s1;
}
}
++tmp;
}
/* parsed to end of string */
tmp = NULL;
return s1;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
char s[] = "_a_bc__d_";
TESTCASE( strtok( s, "_" ) == &s[1] );
TESTCASE( s[1] == 'a' );
TESTCASE( s[2] == '\0' );
TESTCASE( strtok( NULL, "_" ) == &s[3] );
TESTCASE( s[3] == 'b' );
TESTCASE( s[4] == 'c' );
TESTCASE( s[5] == '\0' );
TESTCASE( strtok( NULL, "_" ) == &s[7] );
TESTCASE( s[6] == '_' );
TESTCASE( s[7] == 'd' );
TESTCASE( s[8] == '\0' );
TESTCASE( strtok( NULL, "_" ) == NULL );
strcpy( s, "ab_cd" );
TESTCASE( strtok( s, "_" ) == &s[0] );
TESTCASE( s[0] == 'a' );
TESTCASE( s[1] == 'b' );
TESTCASE( s[2] == '\0' );
TESTCASE( strtok( NULL, "_" ) == &s[3] );
TESTCASE( s[3] == 'c' );
TESTCASE( s[4] == 'd' );
TESTCASE( s[5] == '\0' );
TESTCASE( strtok( NULL, "_" ) == NULL );
return TEST_RESULTS;
}
#endif
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