3 /* strtoimax( const char *, char * *, int )
5 This file is part of the Public Domain C Library (PDCLib).
6 Permission is granted to use, modify, and / or redistribute at will.
16 intmax_t strtoimax( const char * _PDCLIB_restrict nptr, char ** _PDCLIB_restrict endptr, int base )
20 const char * p = _PDCLIB_strtox_prelim( nptr, &sign, &base );
21 if ( base < 2 || base > 36 ) return 0;
24 rc = (intmax_t)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)INTMAX_MAX, (uintmax_t)( INTMAX_MAX / base ), (int)( INTMAX_MAX % base ), &sign );
28 /* FIXME: This breaks on some machines that round negatives wrongly */
29 rc = (intmax_t)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)INTMAX_MIN, (uintmax_t)( INTMAX_MIN / -base ), (int)( -( INTMAX_MIN % base ) ), &sign );
31 if ( endptr != NULL ) *endptr = ( p != NULL ) ? (char *) p : (char *) nptr;
32 return ( sign == '+' ) ? rc : -rc;
38 #include <_PDCLIB_test.h>
45 /* this, to base 36, overflows even a 256 bit integer */
46 char overflow[] = "-ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ_";
47 /* tricky border case */
48 char tricky[] = "+0xz";
50 /* basic functionality */
51 TESTCASE( strtoimax( "123", NULL, 10 ) == 123 );
52 /* proper detecting of default base 10 */
53 TESTCASE( strtoimax( "456", NULL, 0 ) == 456 );
54 /* proper functioning to smaller base */
55 TESTCASE( strtoimax( "14", NULL, 8 ) == 12 );
56 /* proper autodetecting of octal */
57 TESTCASE( strtoimax( "016", NULL, 0 ) == 14 );
58 /* proper autodetecting of hexadecimal, lowercase 'x' */
59 TESTCASE( strtoimax( "0xFF", NULL, 0 ) == 255 );
60 /* proper autodetecting of hexadecimal, uppercase 'X' */
61 TESTCASE( strtoimax( "0Xa1", NULL, 0 ) == 161 );
62 /* proper handling of border case: 0x followed by non-hexdigit */
63 TESTCASE( strtoimax( tricky, &endptr, 0 ) == 0 );
64 TESTCASE( endptr == tricky + 2 );
65 /* proper handling of border case: 0 followed by non-octdigit */
66 TESTCASE( strtoimax( tricky, &endptr, 8 ) == 0 );
67 TESTCASE( endptr == tricky + 2 );
68 /* errno should still be 0 */
69 TESTCASE( errno == 0 );
70 /* overflowing subject sequence must still return proper endptr */
71 TESTCASE( strtoimax( overflow, &endptr, 36 ) == INTMAX_MIN );
72 TESTCASE( errno == ERANGE );
73 TESTCASE( ( endptr - overflow ) == 53 );
74 /* same for positive */
76 TESTCASE( strtoimax( overflow + 1, &endptr, 36 ) == INTMAX_MAX );
77 TESTCASE( errno == ERANGE );
78 TESTCASE( ( endptr - overflow ) == 53 );
79 /* testing skipping of leading whitespace */
80 TESTCASE( strtoimax( " \n\v\t\f789", NULL, 0 ) == 789 );
81 /* testing conversion failure */
82 TESTCASE( strtoimax( overflow, &endptr, 10 ) == 0 );
83 TESTCASE( endptr == overflow );
85 TESTCASE( strtoimax( overflow, &endptr, 0 ) == 0 );
86 TESTCASE( endptr == overflow );
87 /* These tests assume two-complement, but conversion should work for */
88 /* one-complement and signed magnitude just as well. Anyone having a */
89 /* platform to test this on? */
91 #if INTMAX_MAX == 0x7fffffffffffffffLL
92 /* testing "even" overflow, i.e. base is power of two */
93 TESTCASE( strtoimax( "9223372036854775807", NULL, 0 ) == INTMAX_MAX );
94 TESTCASE( errno == 0 );
95 TESTCASE( strtoimax( "9223372036854775808", NULL, 0 ) == INTMAX_MAX );
96 TESTCASE( errno == ERANGE );
98 TESTCASE( strtoimax( "-9223372036854775807", NULL, 0 ) == (INTMAX_MIN + 1) );
99 TESTCASE( errno == 0 );
100 TESTCASE( strtoimax( "-9223372036854775808", NULL, 0 ) == INTMAX_MIN );
101 TESTCASE( errno == 0 );
102 TESTCASE( strtoimax( "-9223372036854775809", NULL, 0 ) == INTMAX_MIN );
103 TESTCASE( errno == ERANGE );
104 /* TODO: test "odd" overflow, i.e. base is not power of two */
105 #elif LLONG_MAX == 0x7fffffffffffffffffffffffffffffffLL
106 /* testing "even" overflow, i.e. base is power of two */
107 TESTCASE( strtoimax( "170141183460469231731687303715884105728", NULL, 0 ) == INTMAX_MAX );
108 TESTCASE( errno == 0 );
109 TESTCASE( strtoimax( "170141183460469231731687303715884105729", NULL, 0 ) == INTMAX_MAX );
110 TESTCASE( errno == ERANGE );
112 TESTCASE( strtoimax( "-170141183460469231731687303715884105728", NULL, 0 ) == (INTMAX_MIN + 1) );
113 TESTCASE( errno == 0 );
114 TESTCASE( strtoimax( "-170141183460469231731687303715884105729", NULL, 0 ) == INTMAX_MIN );
115 TESTCASE( errno == 0 );
116 TESTCASE( strtoimax( "-170141183460469231731687303715884105730", NULL, 0 ) == INTMAX_MIN );
117 TESTCASE( errno == ERANGE );
118 /* TODO: test "odd" overflow, i.e. base is not power of two */
120 #error Unsupported width of 'intmax_t' (neither 64 nor 128 bit).