2 * Copyright (c) 1990, 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
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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[] = "@(#)strtoul.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 unsigned long integer.
44 * Assumes that the upper and lower case
45 * alphabets and digits are each contiguous.
48 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)
57 * See strtol for comments as to the logic used.
62 } while (isspace((unsigned char)c));
71 if ((base == 0 || base == 16) &&
72 c == '0' && (*s == 'x' || *s == 'X') &&
73 ((s[1] >= '0' && s[1] <= '9') ||
74 (s[1] >= 'A' && s[1] <= 'F') ||
75 (s[1] >= 'a' && s[1] <= 'f'))) {
81 base = c == '0' ? 8 : 10;
83 if (base < 2 || base > 36)
86 cutoff = ULONG_MAX / base;
87 cutlim = ULONG_MAX % base;
89 if (c >= '0' && c <= '9')
91 else if (c >= 'A' && c <= 'Z')
93 else if (c >= 'a' && c <= 'z')
99 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
116 *endptr = (char *)(any ? s - 1 : nptr);