1 /* strtol( 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 long int strtol( const char * s, char ** endptr, int base )
18 const char * p = _PDCLIB_strtox_prelim( s, &sign, &base );
19 if ( base < 2 || base > 36 ) return 0;
22 rc = (long int)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)LONG_MAX, (uintmax_t)( LONG_MAX / base ), (int)( LONG_MAX % base ), &sign );
26 rc = (long int)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)LONG_MIN, (uintmax_t)( LONG_MIN / -base ), (int)( -( LONG_MIN % base ) ), &sign );
28 if ( endptr != NULL ) *endptr = ( p != NULL ) ? (char *) p : (char *) s;
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( strtol( "123", NULL, 10 ) == 123 );
49 /* proper detecting of default base 10 */
50 TESTCASE( strtol( "456", NULL, 0 ) == 456 );
51 /* proper functioning to smaller base */
52 TESTCASE( strtol( "14", NULL, 8 ) == 12 );
53 /* proper autodetecting of octal */
54 TESTCASE( strtol( "016", NULL, 0 ) == 14 );
55 /* proper autodetecting of hexadecimal, lowercase 'x' */
56 TESTCASE( strtol( "0xFF", NULL, 0 ) == 255 );
57 /* proper autodetecting of hexadecimal, uppercase 'X' */
58 TESTCASE( strtol( "0Xa1", NULL, 0 ) == 161 );
59 /* proper handling of border case: 0x followed by non-hexdigit */
60 TESTCASE( strtol( tricky, &endptr, 0 ) == 0 );
61 TESTCASE( endptr == tricky + 2 );
62 /* proper handling of border case: 0 followed by non-octdigit */
63 TESTCASE( strtol( 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( strtol( overflow, &endptr, 36 ) == LONG_MIN );
69 TESTCASE( errno == ERANGE );
70 TESTCASE( ( endptr - overflow ) == 53 );
71 /* same for positive */
73 TESTCASE( strtol( overflow + 1, &endptr, 36 ) == LONG_MAX );
74 TESTCASE( errno == ERANGE );
75 TESTCASE( ( endptr - overflow ) == 53 );
76 /* testing skipping of leading whitespace */
77 TESTCASE( strtol( " \n\v\t\f789", NULL, 0 ) == 789 );
78 /* testing conversion failure */
79 TESTCASE( strtol( overflow, &endptr, 10 ) == 0 );
80 TESTCASE( endptr == overflow );
82 TESTCASE( strtol( overflow, &endptr, 0 ) == 0 );
83 TESTCASE( endptr == overflow );
84 /* TODO: These tests assume two-complement, but conversion should work */
85 /* for one-complement and signed magnitude just as well. Anyone having */
86 /* a platform to test this on? */
88 #if LONG_MAX >> 30 == 1
89 /* testing "even" overflow, i.e. base is power of two */
90 TESTCASE( strtol( "2147483647", NULL, 0 ) == 0x7fffffff );
91 TESTCASE( errno == 0 );
93 TESTCASE( strtol( "2147483648", NULL, 0 ) == LONG_MAX );
94 TESTCASE( errno == ERANGE );
96 TESTCASE( strtol( "-2147483647", NULL, 0 ) == (long)0x80000001 );
97 TESTCASE( errno == 0 );
99 TESTCASE( strtol( "-2147483648", NULL, 0 ) == LONG_MIN );
100 TESTCASE( errno == 0 );
102 TESTCASE( strtol( "-2147483649", NULL, 0 ) == LONG_MIN );
103 TESTCASE( errno == ERANGE );
104 /* TODO: test "odd" overflow, i.e. base is not power of two */
105 #elif LONG_MAX >> 62 == 1
106 /* testing "even" overflow, i.e. base is power of two */
107 TESTCASE( strtol( "9223372036854775807", NULL, 0 ) == 0x7fffffffffffffff );
108 TESTCASE( errno == 0 );
110 TESTCASE( strtol( "9223372036854775808", NULL, 0 ) == LONG_MAX );
111 TESTCASE( errno == ERANGE );
113 TESTCASE( strtol( "-9223372036854775807", NULL, 0 ) == (long)0x8000000000000001 );
114 TESTCASE( errno == 0 );
116 TESTCASE( strtol( "-9223372036854775808", NULL, 0 ) == LONG_MIN );
117 TESTCASE( errno == 0 );
119 TESTCASE( strtol( "-9223372036854775809", NULL, 0 ) == LONG_MIN );
120 TESTCASE( errno == ERANGE );
121 /* TODO: test "odd" overflow, i.e. base is not power of two */
123 #error Unsupported width of 'long' (neither 32 nor 64 bit).