1 /* $DragonFly: src/lib/libc/stdlib/_strtol.h,v 1.1 2005/03/17 15:09:01 joerg Exp $ */
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31 * Original version ID:
32 * $NetBSD: src/lib/libc/locale/_wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp $
36 * function template for strtol, strtoll and strtoimax.
39 * _FUNCNAME : function name
41 * __INT_MIN : lower limit of the return type
42 * __INT_MAX : upper limit of the return type
46 _FUNCNAME(const char *nptr, char **endptr, int base)
51 int i, neg, any, cutlim;
53 _DIAGASSERT(nptr != NULL);
54 /* endptr may be NULL */
56 /* check base value */
57 if (base && (base < 2 || base > 36)) {
63 * Skip white space and pick up leading +/- sign if any.
64 * If base is 0, allow 0x for hex and 0 for octal, else
65 * assume decimal; if base is already 16, allow 0x.
79 if ((base == 0 || base == 16) &&
80 c == '0' && (*s == 'x' || *s == 'X')) {
86 base = c == '0' ? 8 : 10;
89 * Compute the cutoff value between legal numbers and illegal
90 * numbers. That is the largest legal value, divided by the
91 * base. An input number that is greater than this value, if
92 * followed by a legal input character, is too big. One that
93 * is equal to this value may be valid or not; the limit
94 * between valid and invalid numbers is then based on the last
95 * digit. For instance, if the range for longs is
96 * [-2147483648..2147483647] and the input base is 10,
97 * cutoff will be set to 214748364 and cutlim to either
98 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
99 * a value > 214748364, or equal but the next digit is > 7 (or 8),
100 * the number is too big, and we will return a range error.
102 * Set any if any `digits' consumed; make it negative to indicate
105 cutoff = neg ? __INT_MIN : __INT_MAX;
106 cutlim = (int)(cutoff % base);
115 for (acc = 0, any = 0;; c = *s++) {
121 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
129 if (acc < cutoff || (acc == cutoff && i > cutlim)) {
139 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
151 /* LINTED interface specification */
152 *endptr = __DECONST(char *, (any ? s - 1 : nptr));