net-snmp
5.4.1
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00001 /* 00002 * Copyright (c) 1990, 1993 00003 * The Regents of the University of California. All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the University nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00018 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 */ 00029 00030 #include <net-snmp/net-snmp-config.h> 00031 00032 #if !HAVE_STRTOUL 00033 00034 #if defined(LIBC_SCCS) && !defined(lint) 00035 static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 00036 #endif /* LIBC_SCCS and not lint */ 00037 00038 #if HAVE_LIMITS_H 00039 #include <limits.h> 00040 #endif 00041 #include <ctype.h> 00042 #include <errno.h> 00043 #if HAVE_STDLIB_H 00044 #include <stdlib.h> 00045 #endif 00046 00047 /* 00048 * Convert a string to an unsigned long integer. 00049 * 00050 * Ignores `locale' stuff. Assumes that the upper and lower case 00051 * alphabets and digits are each contiguous. 00052 */ 00053 unsigned long 00054 strtoul(const char *nptr, char **endptr, int base) 00055 { 00056 const char *s = nptr; 00057 unsigned long acc; 00058 unsigned char c; 00059 unsigned long cutoff; 00060 int neg = 0, any, cutlim; 00061 00062 /* 00063 * See strtol for comments as to the logic used. 00064 */ 00065 do { 00066 c = *s++; 00067 } while (isspace(c)); 00068 if (c == '-') { 00069 neg = 1; 00070 c = *s++; 00071 } else if (c == '+') 00072 c = *s++; 00073 if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) { 00074 c = s[1]; 00075 s += 2; 00076 base = 16; 00077 } 00078 if (base == 0) 00079 base = c == '0' ? 8 : 10; 00080 cutoff = (unsigned long) ULONG_MAX / (unsigned long) base; 00081 cutlim = (unsigned long) ULONG_MAX % (unsigned long) base; 00082 for (acc = 0, any = 0;; c = *s++) { 00083 if (!isascii(c)) 00084 break; 00085 if (isdigit(c)) 00086 c -= '0'; 00087 else if (isalpha(c)) 00088 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 00089 else 00090 break; 00091 if (c >= base) 00092 break; 00093 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 00094 any = -1; 00095 else { 00096 any = 1; 00097 acc *= base; 00098 acc += c; 00099 } 00100 } 00101 if (any < 0) { 00102 acc = ULONG_MAX; 00103 errno = ERANGE; 00104 } else if (neg) 00105 acc = -acc; 00106 if (endptr != 0) 00107 *endptr = (char *) (any ? s - 1 : nptr); 00108 return (acc); 00109 } 00110 00111 #endif /* !HAVE_STRTOUL */