* Copyright (c) 1990 Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)strtoul.c 5.3 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
* Convert a string to an unsigned long integer.
* Ignores `locale' stuff. Assumes that the upper and lower case
* alphabets and digits are each contiguous.
strtoul(nptr
, endptr
, base
)
register const char *s
= nptr
;
register unsigned long acc
;
register unsigned long cutoff
;
register int neg
= 0, any
, cutlim
;
* See strtol for comments as to the logic used.
if ((base
== 0 || base
== 16) &&
c
== '0' && (*s
== 'x' || *s
== 'X')) {
base
= c
== '0' ? 8 : 10;
cutoff
= (unsigned long)ULONG_MAX
/ (unsigned long)base
;
cutlim
= (unsigned long)ULONG_MAX
% (unsigned long)base
;
for (acc
= 0, any
= 0;; c
= *s
++) {
c
-= isupper(c
) ? 'A' - 10 : 'a' - 10;
if (any
< 0 || acc
> cutoff
|| acc
== cutoff
&& c
> cutlim
)
*endptr
= any
? s
- 1 : (char *)nptr
;