| /* |
| * Copyright (c) 1990 Regents of the University of California. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 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. [rescinded 22 July 1999] |
| * 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 |
| * SUCH DAMAGE. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| #ifdef HAVE_LIMITS_H |
| #include <limits.h> |
| #endif |
| #ifdef HAVE_SYS_PARAM_H |
| #include <sys/param.h> |
| #endif |
| #include <errno.h> |
| #ifdef NEED_DECLARATION_ERRNO |
| extern int errno; |
| #endif |
| #if 0 |
| #include <stdlib.h> |
| #endif |
| #include "ansidecl.h" |
| #include "safe-ctype.h" |
| |
| #ifndef ULONG_MAX |
| #define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */ |
| #endif |
| |
| /* |
| * Convert a string to an unsigned long integer. |
| * |
| * Ignores `locale' stuff. Assumes that the upper and lower case |
| * alphabets and digits are each contiguous. |
| */ |
| unsigned long |
| strtoul(const char *nptr, char **endptr, register int base) |
| { |
| register const char *s = nptr; |
| register unsigned long acc; |
| register int c; |
| register unsigned long cutoff; |
| register int neg = 0, any, cutlim; |
| |
| /* |
| * See strtol for comments as to the logic used. |
| */ |
| do { |
| c = *s++; |
| } while (ISSPACE(c)); |
| if (c == '-') { |
| neg = 1; |
| c = *s++; |
| } else if (c == '+') |
| c = *s++; |
| if ((base == 0 || base == 16) && |
| c == '0' && (*s == 'x' || *s == 'X')) { |
| c = s[1]; |
| s += 2; |
| base = 16; |
| } |
| if (base == 0) |
| 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++) { |
| if (ISDIGIT(c)) |
| c -= '0'; |
| else if (ISALPHA(c)) |
| c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10; |
| else |
| break; |
| if (c >= base) |
| break; |
| if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) |
| any = -1; |
| else { |
| any = 1; |
| acc *= base; |
| acc += c; |
| } |
| } |
| if (any < 0) { |
| acc = ULONG_MAX; |
| errno = ERANGE; |
| } else if (neg) |
| acc = -acc; |
| if (endptr != 0) |
| *endptr = (char *) (any ? s - 1 : nptr); |
| return (acc); |
| } |