2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "from @(#)strtol.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
42 * Convert a string to an intmax_t integer.
44 * Assumes that the upper and lower case
45 * alphabets and digits are each contiguous.
48 strtoimax(const char * __restrict nptr, char ** __restrict endptr, int base)
57 * Skip white space and pick up leading +/- sign if any.
58 * If base is 0, allow 0x for hex and 0 for octal, else
59 * assume decimal; if base is already 16, allow 0x.
64 } while (isspace((unsigned char)c));
73 if ((base == 0 || base == 16) &&
74 c == '0' && (*s == 'x' || *s == 'X') &&
75 ((s[1] >= '0' && s[1] <= '9') ||
76 (s[1] >= 'A' && s[1] <= 'F') ||
77 (s[1] >= 'a' && s[1] <= 'f'))) {
83 base = c == '0' ? 8 : 10;
85 if (base < 2 || base > 36)
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 intmax_t is
96 * [-9223372036854775808..9223372036854775807] and the input base
97 * is 10, cutoff will be set to 922337203685477580 and cutlim to
98 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
99 * accumulated a value > 922337203685477580, or equal but the
100 * next digit is > 7 (or 8), the number is too big, and we will
101 * return a range error.
103 * Set 'any' if any `digits' consumed; make it negative to indicate
106 cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
108 cutlim = cutoff % base;
110 for ( ; ; c = *s++) {
111 if (c >= '0' && c <= '9')
113 else if (c >= 'A' && c <= 'Z')
115 else if (c >= 'a' && c <= 'z')
121 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
130 acc = neg ? INTMAX_MIN : INTMAX_MAX;
138 *endptr = (char *)(any ? s - 1 : nptr);