1 /* $NetBSD: _strtol.h,v 1.2 2009/05/20 22:03:29 christos Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
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33 * Original version ID:
34 * NetBSD: src/lib/libc/locale/_wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp
38 * function template for strtol, strtoll and strtoimax.
41 * _FUNCNAME : function name
43 * __INT_MIN : lower limit of the return type
44 * __INT_MAX : upper limit of the return type
48 _FUNCNAME(const char *nptr, char **endptr, int base)
53 int any, cutlim, i, neg;
55 /* check base value */
56 if (base && (base < 2 || base > 36)) {
57 #if !defined(_KERNEL) && !defined(_STANDALONE)
60 /* LINTED interface specification */
61 *endptr = __DECONST(void *, nptr);
64 panic("%s: invalid base %d", __func__, base);
69 * Skip white space and pick up leading +/- sign if any.
70 * If base is 0, allow 0x for hex and 0 for octal, else
71 * assume decimal; if base is already 16, allow 0x.
85 if ((base == 0 || base == 16) &&
86 c == '0' && (*s == 'x' || *s == 'X') &&
87 ((s[1] >= '0' && s[1] <= '9') ||
88 (s[1] >= 'A' && s[1] <= 'F') ||
89 (s[1] >= 'a' && s[1] <= 'f'))) {
94 if ((base == 0 || base == 2) &&
95 c == '0' && (*s == 'b' || *s == 'B') &&
96 (s[1] >= '0' && s[1] <= '1')) {
102 base = (c == '0' ? 8 : 10);
105 * Compute the cutoff value between legal numbers and illegal
106 * numbers. That is the largest legal value, divided by the
107 * base. An input number that is greater than this value, if
108 * followed by a legal input character, is too big. One that
109 * is equal to this value may be valid or not; the limit
110 * between valid and invalid numbers is then based on the last
111 * digit. For instance, if the range for longs is
112 * [-2147483648..2147483647] and the input base is 10,
113 * cutoff will be set to 214748364 and cutlim to either
114 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
115 * a value > 214748364, or equal but the next digit is > 7 (or 8),
116 * the number is too big, and we will return a range error.
118 * Set any if any `digits' consumed; make it negative to indicate
121 cutoff = (neg ? __INT_MIN : __INT_MAX);
122 cutlim = (int)(cutoff % base);
131 for (acc = 0, any = 0;; c = *s++) {
135 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
143 if (acc < cutoff || (acc == cutoff && i > cutlim)) {
145 #if !defined(_KERNEL) && !defined(_STANDALONE)
158 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
160 #if !defined(_KERNEL) && !defined(_STANDALONE)
175 /* LINTED interface specification */
176 *endptr = __DECONST(void *, any ? s - 1 : nptr);