1 /* strtoimax( const char *, char * *, int )
3 This file is part of the Public Domain C Library (PDCLib).
4 Permission is granted to use, modify, and / or redistribute at will.
14 intmax_t strtoimax( const char * _PDCLIB_restrict nptr, char ** _PDCLIB_restrict endptr, int base )
18 const char * p = _PDCLIB_strtox_prelim( nptr, &sign, &base );
19 if ( base < 2 || base > 36 ) return 0;
22 rc = (intmax_t)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)INTMAX_MAX, (uintmax_t)( INTMAX_MAX / base ), (int)( INTMAX_MAX % base ), &sign );
26 rc = (intmax_t)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)INTMAX_MIN, (uintmax_t)( INTMAX_MIN / -base ), (int)( -( INTMAX_MIN % base ) ), &sign );
28 if ( endptr != NULL ) *endptr = ( p != NULL ) ? (char *) p : (char *) nptr;
29 return ( sign == '+' ) ? rc : -rc;
35 #include "_PDCLIB_test.h"
42 /* this, to base 36, overflows even a 256 bit integer */
43 char overflow[] = "-ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ_";
44 /* tricky border case */
45 char tricky[] = "+0xz";
47 /* basic functionality */
48 TESTCASE( strtoimax( "123", NULL, 10 ) == 123 );
49 /* proper detecting of default base 10 */
50 TESTCASE( strtoimax( "456", NULL, 0 ) == 456 );
51 /* proper functioning to smaller base */
52 TESTCASE( strtoimax( "14", NULL, 8 ) == 12 );
53 /* proper autodetecting of octal */
54 TESTCASE( strtoimax( "016", NULL, 0 ) == 14 );
55 /* proper autodetecting of hexadecimal, lowercase 'x' */
56 TESTCASE( strtoimax( "0xFF", NULL, 0 ) == 255 );
57 /* proper autodetecting of hexadecimal, uppercase 'X' */
58 TESTCASE( strtoimax( "0Xa1", NULL, 0 ) == 161 );
59 /* proper handling of border case: 0x followed by non-hexdigit */
60 TESTCASE( strtoimax( tricky, &endptr, 0 ) == 0 );
61 TESTCASE( endptr == tricky + 2 );
62 /* proper handling of border case: 0 followed by non-octdigit */
63 TESTCASE( strtoimax( tricky, &endptr, 8 ) == 0 );
64 TESTCASE( endptr == tricky + 2 );
65 /* errno should still be 0 */
66 TESTCASE( errno == 0 );
67 /* overflowing subject sequence must still return proper endptr */
68 TESTCASE( strtoimax( overflow, &endptr, 36 ) == INTMAX_MIN );
69 TESTCASE( errno == ERANGE );
70 TESTCASE( ( endptr - overflow ) == 53 );
71 /* same for positive */
73 TESTCASE( strtoimax( overflow + 1, &endptr, 36 ) == INTMAX_MAX );
74 TESTCASE( errno == ERANGE );
75 TESTCASE( ( endptr - overflow ) == 53 );
76 /* testing skipping of leading whitespace */
77 TESTCASE( strtoimax( " \n\v\t\f789", NULL, 0 ) == 789 );
78 /* testing conversion failure */
79 TESTCASE( strtoimax( overflow, &endptr, 10 ) == 0 );
80 TESTCASE( endptr == overflow );
82 TESTCASE( strtoimax( overflow, &endptr, 0 ) == 0 );
83 TESTCASE( endptr == overflow );
84 /* These tests assume two-complement, but conversion should work for */
85 /* one-complement and signed magnitude just as well. Anyone having a */
86 /* platform to test this on? */
88 #if INTMAX_MAX >> 62 == 1
89 /* testing "odd" overflow, i.e. base is not a power of two */
90 TESTCASE( strtoimax( "9223372036854775807", NULL, 0 ) == INTMAX_MAX );
91 TESTCASE( errno == 0 );
92 TESTCASE( strtoimax( "9223372036854775808", NULL, 0 ) == INTMAX_MAX );
93 TESTCASE( errno == ERANGE );
95 TESTCASE( strtoimax( "-9223372036854775807", NULL, 0 ) == (INTMAX_MIN + 1) );
96 TESTCASE( errno == 0 );
97 TESTCASE( strtoimax( "-9223372036854775808", NULL, 0 ) == INTMAX_MIN );
98 TESTCASE( errno == 0 );
99 TESTCASE( strtoimax( "-9223372036854775809", NULL, 0 ) == INTMAX_MIN );
100 TESTCASE( errno == ERANGE );
101 /* testing "even" overflow, i.e. base is power of two */
103 TESTCASE( strtoimax( "0x7fffffffffffffff", NULL, 0 ) == INTMAX_MAX );
104 TESTCASE( errno == 0 );
105 TESTCASE( strtoimax( "0x8000000000000000", NULL, 0 ) == INTMAX_MAX );
106 TESTCASE( errno == ERANGE );
108 TESTCASE( strtoimax( "-0x7fffffffffffffff", NULL, 0 ) == (INTMAX_MIN + 1) );
109 TESTCASE( errno == 0 );
110 TESTCASE( strtoimax( "-0x8000000000000000", NULL, 0 ) == INTMAX_MIN );
111 TESTCASE( errno == 0 );
112 TESTCASE( strtoimax( "-0x8000000000000001", NULL, 0 ) == INTMAX_MIN );
113 TESTCASE( errno == ERANGE );
114 #elif LLONG_MAX >> 126 == 1
115 /* testing "odd" overflow, i.e. base is not a power of two */
116 TESTCASE( strtoimax( "170141183460469231731687303715884105728", NULL, 0 ) == INTMAX_MAX );
117 TESTCASE( errno == 0 );
118 TESTCASE( strtoimax( "170141183460469231731687303715884105729", NULL, 0 ) == INTMAX_MAX );
119 TESTCASE( errno == ERANGE );
121 TESTCASE( strtoimax( "-170141183460469231731687303715884105728", NULL, 0 ) == (INTMAX_MIN + 1) );
122 TESTCASE( errno == 0 );
123 TESTCASE( strtoimax( "-170141183460469231731687303715884105729", NULL, 0 ) == INTMAX_MIN );
124 TESTCASE( errno == 0 );
125 TESTCASE( strtoimax( "-170141183460469231731687303715884105730", NULL, 0 ) == INTMAX_MIN );
126 TESTCASE( errno == ERANGE );
127 /* testing "even" overflow, i.e. base is power of two */
129 TESTCASE( strtoimax( "0x7fffffffffffffffffffffffffffffff", NULL, 0 ) == INTMAX_MAX );
130 TESTCASE( errno == 0 );
131 TESTCASE( strtoimax( "0x80000000000000000000000000000000", NULL, 0 ) == INTMAX_MAX );
132 TESTCASE( errno == ERANGE );
134 TESTCASE( strtoimax( "-0x7fffffffffffffffffffffffffffffff", NULL, 0 ) == (INTMAX_MIN + 1) );
135 TESTCASE( errno == 0 );
136 TESTCASE( strtoimax( "-0x80000000000000000000000000000000", NULL, 0 ) == INTMAX_MIN );
137 TESTCASE( errno == 0 );
138 TESTCASE( strtoimax( "-0x80000000000000000000000000000001", NULL, 0 ) == INTMAX_MIN );
139 TESTCASE( errno == ERANGE );
141 #error Unsupported width of 'intmax_t' (neither 64 nor 128 bit).