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git.ipfire.org Git - thirdparty/squid.git/blob - compat/strtoll.c
2 * Copyright (c) 1990 The Regents of the University of California.
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6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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34 /* modified for long long <mgd@swarm.org> 1999-08-12 */
37 #include "compat/strtoll.h"
47 /* Native 64 bit system without strtoll() */
48 #if defined(LONG_MIN) && (SIZEOF_LONG == 8)
49 #define INT64_MIN LONG_MIN
52 #define INT64_MIN -9223372036854775807L-1L
57 /* Native 64 bit system without strtoll() */
58 #if defined(LONG_MAX) && (SIZEOF_LONG == 8)
59 #define INT64_MAX LONG_MAX
62 #define INT64_MAX 9223372036854775807L
67 * Convert a string to a int64 integer.
69 * Ignores `locale' stuff. Assumes that the upper and lower case
70 * alphabets and digits are each contiguous.
73 strtoll (const char *nptr
, char **endptr
, int base
)
75 register const char *s
= nptr
;
76 register uint64_t acc
;
78 register uint64_t cutoff
;
79 register int neg
= 0, any
, cutlim
;
82 * Skip white space and pick up leading +/- sign if any.
83 * If base is 0, allow 0x for hex and 0 for octal, else
84 * assume decimal; if base is already 16, allow 0x.
88 } while (xisspace(c
));
94 if ((base
== 0 || base
== 16) && c
== '0' && (*s
== 'x' || *s
== 'X')) {
100 base
= c
== '0' ? 8 : 10;
103 * Compute the cutoff value between legal numbers and illegal
104 * numbers. That is the largest legal value, divided by the
105 * base. An input number that is greater than this value, if
106 * followed by a legal input character, is too big. One that
107 * is equal to this value may be valid or not; the limit
108 * between valid and invalid numbers is then based on the last
109 * digit. For instance, if the range for longs is
110 * [-2147483648..2147483647] and the input base is 10,
111 * cutoff will be set to 214748364 and cutlim to either
112 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
113 * a value > 214748364, or equal but the next digit is > 7 (or 8),
114 * the number is too big, and we will return a range error.
116 * Set any if any `digits' consumed; make it negative to indicate
119 cutoff
= neg
? -(uint64_t) INT64_MIN
: INT64_MAX
;
120 cutlim
= cutoff
% (uint64_t) base
;
121 cutoff
/= (uint64_t) base
;
122 for (acc
= 0, any
= 0;; c
= *s
++) {
125 else if (xisalpha(c
))
126 c
-= xisupper(c
) ? 'A' - 10 : 'a' - 10;
131 if (any
< 0 || acc
> cutoff
|| (acc
== cutoff
&& c
> cutlim
))
140 acc
= neg
? INT64_MIN
: INT64_MAX
;
145 *endptr
= (char *) (any
? s
- 1 : nptr
);