100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/* strtoull( const char *, char * *, int )
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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 <limits.h>
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#include <stdlib.h>
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#ifndef REGTEST
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#include <stdint.h>
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unsigned long long int strtoull( const char * s, char ** endptr, int base )
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{
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unsigned long long int rc;
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char sign = '+';
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const char * p = _PDCLIB_strtox_prelim( s, &sign, &base );
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if ( base < 2 || base > 36 ) return 0;
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rc = _PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)ULLONG_MAX, (uintmax_t)( ULLONG_MAX / base ), (int)( ULLONG_MAX % base ), &sign );
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if ( endptr != NULL ) *endptr = ( p != NULL ) ? (char *) p : (char *) s;
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return ( sign == '+' ) ? rc : -rc;
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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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#include <errno.h>
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int main( void )
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{
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char * endptr;
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/* this, to base 36, overflows even a 256 bit integer */
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char overflow[] = "-ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ_";
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/* tricky border case */
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char tricky[] = "+0xz";
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errno = 0;
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/* basic functionality */
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TESTCASE( strtoull( "123", NULL, 10 ) == 123 );
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/* proper detecting of default base 10 */
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TESTCASE( strtoull( "456", NULL, 0 ) == 456 );
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/* proper functioning to smaller base */
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TESTCASE( strtoull( "14", NULL, 8 ) == 12 );
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/* proper autodetecting of octal */
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TESTCASE( strtoull( "016", NULL, 0 ) == 14 );
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/* proper autodetecting of hexadecimal, lowercase 'x' */
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TESTCASE( strtoull( "0xFF", NULL, 0 ) == 255 );
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/* proper autodetecting of hexadecimal, uppercase 'X' */
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TESTCASE( strtoull( "0Xa1", NULL, 0 ) == 161 );
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/* proper handling of border case: 0x followed by non-hexdigit */
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TESTCASE( strtoull( tricky, &endptr, 0 ) == 0 );
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TESTCASE( endptr == tricky + 2 );
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/* proper handling of border case: 0 followed by non-octdigit */
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TESTCASE( strtoull( tricky, &endptr, 8 ) == 0 );
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TESTCASE( endptr == tricky + 2 );
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/* errno should still be 0 */
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TESTCASE( errno == 0 );
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/* overflowing subject sequence must still return proper endptr */
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TESTCASE( strtoull( overflow, &endptr, 36 ) == ULLONG_MAX );
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TESTCASE( errno == ERANGE );
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TESTCASE( ( endptr - overflow ) == 53 );
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/* same for positive */
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errno = 0;
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TESTCASE( strtoull( overflow + 1, &endptr, 36 ) == ULLONG_MAX );
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TESTCASE( errno == ERANGE );
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TESTCASE( ( endptr - overflow ) == 53 );
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/* testing skipping of leading whitespace */
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TESTCASE( strtoull( " \n\v\t\f789", NULL, 0 ) == 789 );
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/* testing conversion failure */
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TESTCASE( strtoull( overflow, &endptr, 10 ) == 0 );
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TESTCASE( endptr == overflow );
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endptr = NULL;
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TESTCASE( strtoull( overflow, &endptr, 0 ) == 0 );
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TESTCASE( endptr == overflow );
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errno = 0;
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/* long long -> 64 bit */
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#if ULLONG_MAX >> 63 == 1
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/* testing "even" overflow, i.e. base is power of two */
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TESTCASE( strtoull( "18446744073709551615", NULL, 0 ) == ULLONG_MAX );
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TESTCASE( errno == 0 );
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TESTCASE( strtoull( "18446744073709551616", NULL, 0 ) == ULLONG_MAX );
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TESTCASE( errno == ERANGE );
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/* TODO: test "odd" overflow, i.e. base is not power of two */
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/* long long -> 128 bit */
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#elif ULLONG_MAX >> 127 == 1
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/* testing "even" overflow, i.e. base is power of two */
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TESTCASE( strtoull( "340282366920938463463374607431768211455", NULL, 0 ) == ULLONG_MAX );
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TESTCASE( errno == 0 );
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TESTCASE( strtoull( "340282366920938463463374607431768211456", NULL, 0 ) == ULLONG_MAX );
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TESTCASE( errno == ERANGE );
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/* TODO: test "odd" overflow, i.e. base is not power of two */
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#else
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#error Unsupported width of 'long long' (neither 64 nor 128 bit).
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#endif
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return TEST_RESULTS;
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}
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#endif
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