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33 @deftypefn Supplemental {long long int} strtoll (const char *@var{string}, @
34 char **@var{endptr}, int @var{base})
35 @deftypefnx Supplemental {unsigned long long int} strtoul (@
36 const char *@var{string}, char **@var{endptr}, int @var{base})
38 The @code{strtoll} function converts the string in @var{string} to a
39 long long integer value according to the given @var{base}, which must be
40 between 2 and 36 inclusive, or be the special value 0. If @var{base}
41 is 0, @code{strtoll} will look for the prefixes @code{0} and @code{0x}
42 to indicate bases 8 and 16, respectively, else default to base 10.
43 When the base is 16 (either explicitly or implicitly), a prefix of
44 @code{0x} is allowed. The handling of @var{endptr} is as that of
45 @code{strtod} above. The @code{strtoull} function is the same, except
46 that the converted value is unsigned.
58 #ifdef HAVE_SYS_PARAM_H
59 #include <sys/param.h>
62 #ifdef NEED_DECLARATION_ERRNO
65 #include "safe-ctype.h"
70 typedef unsigned long long ullong_type
;
73 typedef long long llong_type
;
75 /* FIXME: It'd be nice to configure around these, but the include files are too
76 painful. These macros should at least be more portable than hardwired hex
80 #define ULLONG_MAX (~(ullong_type)0) /* 0xFFFFFFFFFFFFFFFF */
84 #define LLONG_MAX ((llong_type)(ULLONG_MAX >> 1)) /* 0x7FFFFFFFFFFFFFFF */
88 #define LLONG_MIN (~LLONG_MAX) /* 0x8000000000000000 */
92 * Convert a string to a long long integer.
94 * Ignores `locale' stuff. Assumes that the upper and lower case
95 * alphabets and digits are each contiguous.
98 strtoll(const char *nptr
, char **endptr
, register int base
)
100 register const char *s
= nptr
;
101 register ullong_type acc
;
103 register ullong_type cutoff
;
104 register int neg
= 0, any
, cutlim
;
107 * Skip white space and pick up leading +/- sign if any.
108 * If base is 0, allow 0x for hex and 0 for octal, else
109 * assume decimal; if base is already 16, allow 0x.
113 } while (ISSPACE(c
));
119 if ((base
== 0 || base
== 16) &&
120 c
== '0' && (*s
== 'x' || *s
== 'X')) {
126 base
= c
== '0' ? 8 : 10;
129 * Compute the cutoff value between legal numbers and illegal
130 * numbers. That is the largest legal value, divided by the
131 * base. An input number that is greater than this value, if
132 * followed by a legal input character, is too big. One that
133 * is equal to this value may be valid or not; the limit
134 * between valid and invalid numbers is then based on the last
135 * digit. For instance, if the range for longs is
136 * [-2147483648..2147483647] and the input base is 10,
137 * cutoff will be set to 214748364 and cutlim to either
138 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
139 * a value > 214748364, or equal but the next digit is > 7 (or 8),
140 * the number is too big, and we will return a range error.
142 * Set any if any `digits' consumed; make it negative to indicate
145 cutoff
= neg
? -(ullong_type
)LLONG_MIN
: LLONG_MAX
;
146 cutlim
= cutoff
% (ullong_type
)base
;
147 cutoff
/= (ullong_type
)base
;
148 for (acc
= 0, any
= 0;; c
= *s
++) {
152 c
-= ISUPPER(c
) ? 'A' - 10 : 'a' - 10;
157 if (any
< 0 || acc
> cutoff
|| (acc
== cutoff
&& c
> cutlim
))
166 acc
= neg
? LLONG_MIN
: LLONG_MAX
;
171 *endptr
= (char *) (any
? s
- 1 : nptr
);
175 #endif /* ifdef HAVE_LONG_LONG */
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