2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
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35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/ctype.h>
41 #include <sys/limits.h>
44 * Convert a string to an unsigned quad integer.
46 * Ignores `locale' stuff. Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
50 strtouq(const char *nptr, char **endptr, int base)
55 u_quad_t qbase, cutoff;
59 * See strtoq for comments as to the logic used.
72 if ((base == 0 || base == 16) &&
73 c == '0' && (*s == 'x' || *s == 'X')) {
79 base = c == '0' ? 8 : 10;
80 qbase = (unsigned)base;
81 cutoff = (u_quad_t)UQUAD_MAX / qbase;
82 cutlim = (u_quad_t)UQUAD_MAX % qbase;
83 for (acc = 0, any = 0;; c = *s++) {
89 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
94 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
107 *endptr = __DECONST(char *, any ? s - 1 : nptr);