diff options
Diffstat (limited to 'src/pdclib/functions/stdlib/strtol.c')
| -rw-r--r-- | src/pdclib/functions/stdlib/strtol.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/pdclib/functions/stdlib/strtol.c b/src/pdclib/functions/stdlib/strtol.c new file mode 100644 index 0000000..d89a648 --- /dev/null +++ b/src/pdclib/functions/stdlib/strtol.c @@ -0,0 +1,129 @@ +/* strtol( 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> + +long int strtol( const char * s, char ** endptr, int base ) +{ + long int rc; + char sign = '+'; + const char * p = _PDCLIB_strtox_prelim( s, &sign, &base ); + if ( base < 2 || base > 36 ) return 0; + if ( sign == '+' ) + { + rc = (long int)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)LONG_MAX, (uintmax_t)( LONG_MAX / base ), (int)( LONG_MAX % base ), &sign ); + } + else + { + rc = (long int)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)LONG_MIN, (uintmax_t)( LONG_MIN / -base ), (int)( -( LONG_MIN % 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( strtol( "123", NULL, 10 ) == 123 ); + /* proper detecting of default base 10 */ + TESTCASE( strtol( "456", NULL, 0 ) == 456 ); + /* proper functioning to smaller base */ + TESTCASE( strtol( "14", NULL, 8 ) == 12 ); + /* proper autodetecting of octal */ + TESTCASE( strtol( "016", NULL, 0 ) == 14 ); + /* proper autodetecting of hexadecimal, lowercase 'x' */ + TESTCASE( strtol( "0xFF", NULL, 0 ) == 255 ); + /* proper autodetecting of hexadecimal, uppercase 'X' */ + TESTCASE( strtol( "0Xa1", NULL, 0 ) == 161 ); + /* proper handling of border case: 0x followed by non-hexdigit */ + TESTCASE( strtol( tricky, &endptr, 0 ) == 0 ); + TESTCASE( endptr == tricky + 2 ); + /* proper handling of border case: 0 followed by non-octdigit */ + TESTCASE( strtol( tricky, &endptr, 8 ) == 0 ); + TESTCASE( endptr == tricky + 2 ); + /* errno should still be 0 */ + TESTCASE( errno == 0 ); + /* overflowing subject sequence must still return proper endptr */ + TESTCASE( strtol( overflow, &endptr, 36 ) == LONG_MIN ); + TESTCASE( errno == ERANGE ); + TESTCASE( ( endptr - overflow ) == 53 ); + /* same for positive */ + errno = 0; + TESTCASE( strtol( overflow + 1, &endptr, 36 ) == LONG_MAX ); + TESTCASE( errno == ERANGE ); + TESTCASE( ( endptr - overflow ) == 53 ); + /* testing skipping of leading whitespace */ + TESTCASE( strtol( " \n\v\t\f789", NULL, 0 ) == 789 ); + /* testing conversion failure */ + TESTCASE( strtol( overflow, &endptr, 10 ) == 0 ); + TESTCASE( endptr == overflow ); + endptr = NULL; + TESTCASE( strtol( 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; +#if LONG_MAX >> 30 == 1 + /* testing "even" overflow, i.e. base is power of two */ + TESTCASE( strtol( "2147483647", NULL, 0 ) == 0x7fffffff ); + TESTCASE( errno == 0 ); + errno = 0; + TESTCASE( strtol( "2147483648", NULL, 0 ) == LONG_MAX ); + TESTCASE( errno == ERANGE ); + errno = 0; + TESTCASE( strtol( "-2147483647", NULL, 0 ) == (long)0x80000001 ); + TESTCASE( errno == 0 ); + errno = 0; + TESTCASE( strtol( "-2147483648", NULL, 0 ) == LONG_MIN ); + TESTCASE( errno == 0 ); + errno = 0; + TESTCASE( strtol( "-2147483649", NULL, 0 ) == LONG_MIN ); + TESTCASE( errno == ERANGE ); + /* TODO: test "odd" overflow, i.e. base is not power of two */ +#elif LONG_MAX >> 62 == 1 + /* testing "even" overflow, i.e. base is power of two */ + TESTCASE( strtol( "9223372036854775807", NULL, 0 ) == 0x7fffffffffffffff ); + TESTCASE( errno == 0 ); + errno = 0; + TESTCASE( strtol( "9223372036854775808", NULL, 0 ) == LONG_MAX ); + TESTCASE( errno == ERANGE ); + errno = 0; + TESTCASE( strtol( "-9223372036854775807", NULL, 0 ) == (long)0x8000000000000001 ); + TESTCASE( errno == 0 ); + errno = 0; + TESTCASE( strtol( "-9223372036854775808", NULL, 0 ) == LONG_MIN ); + TESTCASE( errno == 0 ); + errno = 0; + TESTCASE( strtol( "-9223372036854775809", NULL, 0 ) == LONG_MIN ); + 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 |