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/* strtoul( const char *, char **, int )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#include <limits.h>
#include <stdlib.h>
#ifndef REGTEST
#include <stdint.h>
unsigned long int strtoul( const char * s, char ** endptr, int base )
{
unsigned long int rc;
char sign = '+';
const char * p = _PDCLIB_strtox_prelim( s, &sign, &base );
if ( base < 2 || base > 36 )
{
return 0;
}
rc = ( unsigned long int )_PDCLIB_strtox_main( &p, ( unsigned )base, ( uintmax_t )ULONG_MAX, ( uintmax_t )( ULONG_MAX / base ), ( int )( ULONG_MAX % base ), &sign );
if ( endptr != NULL )
{
*endptr = ( p != NULL ) ? ( char * ) p : ( char * ) s;
}
return ( sign == '+' ) ? rc : -rc;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
#include <errno.h>
int main( void )
{
char * endptr;
/* this, to base 36, overflows even a 256 bit integer */
char overflow[] = "-ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ_";
/* tricky border case */
char tricky[] = "+0xz";
errno = 0;
/* basic functionality */
TESTCASE( strtoul( "123", NULL, 10 ) == 123 );
/* proper detecting of default base 10 */
TESTCASE( strtoul( "456", NULL, 0 ) == 456 );
/* proper functioning to smaller base */
TESTCASE( strtoul( "14", NULL, 8 ) == 12 );
/* proper autodetecting of octal */
TESTCASE( strtoul( "016", NULL, 0 ) == 14 );
/* proper autodetecting of hexadecimal, lowercase 'x' */
TESTCASE( strtoul( "0xFF", NULL, 0 ) == 255 );
/* proper autodetecting of hexadecimal, uppercase 'X' */
TESTCASE( strtoul( "0Xa1", NULL, 0 ) == 161 );
/* proper handling of border case: 0x followed by non-hexdigit */
TESTCASE( strtoul( tricky, &endptr, 0 ) == 0 );
TESTCASE( endptr == tricky + 2 );
/* proper handling of border case: 0 followed by non-octdigit */
TESTCASE( strtoul( tricky, &endptr, 8 ) == 0 );
TESTCASE( endptr == tricky + 2 );
/* errno should still be 0 */
TESTCASE( errno == 0 );
/* correctly decoding zero */
TESTCASE( strtoul( "0", &endptr, 0 ) == 0 );
TESTCASE( *endptr == '\0' );
TESTCASE( errno == 0 );
/* overflowing subject sequence must still return proper endptr */
TESTCASE( strtoul( overflow, &endptr, 36 ) == ULONG_MAX );
TESTCASE( errno == ERANGE );
TESTCASE( ( endptr - overflow ) == 53 );
/* same for positive */
errno = 0;
TESTCASE( strtoul( overflow + 1, &endptr, 36 ) == ULONG_MAX );
TESTCASE( errno == ERANGE );
TESTCASE( ( endptr - overflow ) == 53 );
/* testing skipping of leading whitespace */
TESTCASE( strtoul( " \n\v\t\f789", NULL, 0 ) == 789 );
/* testing conversion failure */
TESTCASE( strtoul( overflow, &endptr, 10 ) == 0 );
TESTCASE( endptr == overflow );
endptr = NULL;
TESTCASE( strtoul( overflow, &endptr, 0 ) == 0 );
TESTCASE( endptr == overflow );
/* TODO: These tests assume two-complement, but conversion should work */
/* for one-complement and signed magnitude just as well. Anyone having */
/* a platform to test this on? */
errno = 0;
/* long -> 32 bit */
#if ULONG_MAX >> 31 == 1
/* testing "even" overflow, i.e. base is power of two */
TESTCASE( strtoul( "4294967295", NULL, 0 ) == ULONG_MAX );
TESTCASE( errno == 0 );
errno = 0;
TESTCASE( strtoul( "4294967296", NULL, 0 ) == ULONG_MAX );
TESTCASE( errno == ERANGE );
/* TODO: test "odd" overflow, i.e. base is not power of two */
/* long -> 64 bit */
#elif ULONG_MAX >> 63 == 1
/* testing "even" overflow, i.e. base is power of two */
TESTCASE( strtoul( "18446744073709551615", NULL, 0 ) == ULONG_MAX );
TESTCASE( errno == 0 );
errno = 0;
TESTCASE( strtoul( "18446744073709551616", NULL, 0 ) == ULONG_MAX );
TESTCASE( errno == ERANGE );
/* TODO: test "odd" overflow, i.e. base is not power of two */
#else
#error Unsupported width of 'long' (neither 32 nor 64 bit).
#endif
return TEST_RESULTS;
}
#endif
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