1 /* 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "port_before.h" 35 36 #include <sys/types.h> 37 #include <sys/param.h> 38 39 #include <ctype.h> 40 #include <errno.h> 41 #include <limits.h> 42 #include <stdlib.h> 43 44 #include "port_after.h" 45 46 #ifndef NEED_STRTOUL 47 int __strtoul_unneeded__; 48 #else 49 50 /*% 51 * Convert a string to an unsigned long integer. 52 * 53 * Ignores `locale' stuff. Assumes that the upper and lower case 54 * alphabets and digits are each contiguous. 55 */ 56 u_long 57 strtoul(const char *nptr, char **endptr, int base) { 58 const char *s = nptr; 59 u_long acc, cutoff; 60 int neg, c, any, cutlim; 61 62 neg = 0; 63 64 /* 65 * See strtol for comments as to the logic used. 66 */ 67 do { 68 c = *(const unsigned char *)s++; 69 } while (isspace(c)); 70 if (c == '-') { 71 neg = 1; 72 c = *s++; 73 } else if (c == '+') 74 c = *s++; 75 if ((base == 0 || base == 16) && 76 c == '0' && (*s == 'x' || *s == 'X')) { 77 c = s[1]; 78 s += 2; 79 base = 16; 80 } 81 if (base == 0) 82 base = c == '0' ? 8 : 10; 83 cutoff = (u_long)ULONG_MAX / (u_long)base; 84 cutlim = (u_long)ULONG_MAX % (u_long)base; 85 for (acc = 0, any = 0;; c = *(const unsigned char*)s++) { 86 if (isdigit(c)) 87 c -= '0'; 88 else if (isalpha(c)) 89 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 90 else 91 break; 92 if (c >= base) 93 break; 94 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 95 any = -1; 96 else { 97 any = 1; 98 acc *= base; 99 acc += c; 100 } 101 } 102 if (any < 0) { 103 acc = ULONG_MAX; 104 errno = ERANGE; 105 } else if (neg) 106 acc = -acc; 107 if (endptr != 0) 108 DE_CONST((any ? s - 1 : nptr), *endptr); 109 return (acc); 110 } 111 112 #endif /*NEED_STRTOUL*/ 113 114 /*! \file */ 115