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 a quad integer.
46 * Ignores `locale' stuff. Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
50 strtoq(const char *nptr, char **endptr, int base)
55 u_quad_t qbase, cutoff;
59 * Skip white space and pick up leading +/- sign if any.
60 * If base is 0, allow 0x for hex and 0 for octal, else
61 * assume decimal; if base is already 16, allow 0x.
75 if ((base == 0 || base == 16) &&
76 c == '0' && (*s == 'x' || *s == 'X')) {
82 base = c == '0' ? 8 : 10;
85 * Compute the cutoff value between legal numbers and illegal
86 * numbers. That is the largest legal value, divided by the
87 * base. An input number that is greater than this value, if
88 * followed by a legal input character, is too big. One that
89 * is equal to this value may be valid or not; the limit
90 * between valid and invalid numbers is then based on the last
91 * digit. For instance, if the range for quads is
92 * [-9223372036854775808..9223372036854775807] and the input base
93 * is 10, cutoff will be set to 922337203685477580 and cutlim to
94 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
95 * accumulated a value > 922337203685477580, or equal but the
96 * next digit is > 7 (or 8), the number is too big, and we will
97 * return a range error.
99 * Set any if any `digits' consumed; make it negative to indicate
102 qbase = (unsigned)base;
103 cutoff = neg ? (u_quad_t)-(QUAD_MIN + QUAD_MAX) + QUAD_MAX : QUAD_MAX;
104 cutlim = cutoff % qbase;
106 for (acc = 0, any = 0;; c = *s++) {
112 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
117 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
126 acc = neg ? QUAD_MIN : QUAD_MAX;
130 *endptr = __DECONST(char *, any ? s - 1 : nptr);