| /* |
| * Copyright (c) 1990 The 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. 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. |
| */ |
| |
| #include <net-snmp/net-snmp-config.h> |
| |
| #if defined(LIBC_SCCS) && !defined(lint) |
| static char sccsid[] = "@(#)strtol.c 5.4 (Berkeley) 2/23/91"; |
| #endif /* LIBC_SCCS and not lint */ |
| |
| #if !HAVE_STRTOL |
| |
| #if HAVE_LIMITS_H |
| #include <limits.h> |
| #endif |
| #include <ctype.h> |
| #include <errno.h> |
| #if HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| |
| /* |
| * Convert a string to a long integer. |
| * |
| * Ignores `locale' stuff. Assumes that the upper and lower case |
| * alphabets and digits are each contiguous. |
| */ |
| long |
| strtol(const char *nptr, char **endptr, int base) |
| { |
| const char *s = nptr; |
| unsigned long acc; |
| int c; |
| unsigned long cutoff; |
| int neg = 0, any, cutlim; |
| |
| /* |
| * Skip white space and pick up leading +/- sign if any. If base is 0, |
| * allow 0x for hex and 0 for octal, else assume decimal; if base is |
| * already 16, allow 0x. |
| */ |
| 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; |
| |
| /* |
| * Compute the cutoff value between legal numbers and illegal numbers. |
| * That is the largest legal value, divided by the base. An input |
| * number that is greater than this value, if followed by a legal |
| * input character, is too big. One that is equal to this value may |
| * be valid or not; the limit between valid and invalid numbers is |
| * then based on the last digit. For instance, if the range for longs |
| * is [-2147483648..2147483647] and the input base is 10, cutoff will |
| * be set to 214748364 and cutlim to either 7 (neg==0) or 8 (neg==1), |
| * meaning that if we have accumulated a value > 214748364, or equal |
| * but the next digit is > 7 (or 8), the number is too big, and we |
| * will return a range error. |
| * |
| * Set any if any `digits' consumed; make it negative to indicate |
| * overflow. |
| */ |
| cutoff = neg ? -(unsigned long) LONG_MIN : LONG_MAX; |
| cutlim = cutoff % (unsigned long) base; |
| cutoff /= (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 = neg ? LONG_MIN : LONG_MAX; |
| errno = ERANGE; |
| } else if (neg) |
| acc = -acc; |
| if (endptr != 0) |
| *endptr = any ? s - 1 : (char *) nptr; |
| return (acc); |
| } |
| |
| #endif /* !HAVE_STRTOL */ |