strtol.c revision 235785
166458Sdfr/*- 266458Sdfr * Copyright (c) 1990, 1993 366458Sdfr * The Regents of the University of California. All rights reserved. 4139790Simp * 566458Sdfr * Copyright (c) 2011 The FreeBSD Foundation 666458Sdfr * All rights reserved. 766458Sdfr * Portions of this software were developed by David Chisnall 866458Sdfr * under sponsorship from the FreeBSD Foundation. 966458Sdfr * 1066458Sdfr * Redistribution and use in source and binary forms, with or without 1166458Sdfr * modification, are permitted provided that the following conditions 1266458Sdfr * are met: 1366458Sdfr * 1. Redistributions of source code must retain the above copyright 1466458Sdfr * notice, this list of conditions and the following disclaimer. 1566458Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1666458Sdfr * notice, this list of conditions and the following disclaimer in the 1766458Sdfr * documentation and/or other materials provided with the distribution. 1866458Sdfr * 4. Neither the name of the University nor the names of its contributors 1966458Sdfr * may be used to endorse or promote products derived from this software 2066458Sdfr * without specific prior written permission. 2166458Sdfr * 2266458Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2366458Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2466458Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2566458Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2666458Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2766458Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2866458Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2966458Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3066458Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3166458Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3266458Sdfr * SUCH DAMAGE. 3366458Sdfr */ 3466458Sdfr 35113941Skan#if defined(LIBC_SCCS) && !defined(lint) 36113941Skanstatic char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93"; 3766458Sdfr#endif /* LIBC_SCCS and not lint */ 38114678Skan#include <sys/cdefs.h> 39114678Skan__FBSDID("$FreeBSD: stable/9/lib/libc/stdlib/strtol.c 235785 2012-05-22 14:40:39Z theraven $"); 40114678Skan 41114678Skan#include <limits.h> 42114678Skan#include <ctype.h> 43114678Skan#include <errno.h> 44114678Skan#include <stdlib.h> 45114678Skan#include "xlocale_private.h" 46114678Skan 47115164Skan 48115164Skan/* 49113941Skan * Convert a string to a long integer. 50113941Skan * 5166458Sdfr * Assumes that the upper and lower case 52217145Stijl * alphabets and digits are each contiguous. 5366458Sdfr */ 54217145Stijllong 55113941Skanstrtol_l(const char * __restrict nptr, char ** __restrict endptr, int base, 56113941Skan locale_t locale) 5766458Sdfr{ 58217145Stijl const char *s; 59113941Skan unsigned long acc; 60113941Skan char c; 6166458Sdfr unsigned long cutoff; 62217145Stijl int neg, any, cutlim; 63217145Stijl FIX_LOCALE(locale); 64217145Stijl 65113941Skan /* 66217145Stijl * Skip white space and pick up leading +/- sign if any. 6767488Sobrien * If base is 0, allow 0x for hex and 0 for octal, else 68113941Skan * assume decimal; if base is already 16, allow 0x. 69113941Skan */ 70113941Skan s = nptr; 7167488Sobrien do { 72113941Skan c = *s++; 7366458Sdfr } while (isspace_l((unsigned char)c, locale)); 74113941Skan if (c == '-') { 7566458Sdfr neg = 1; 76113941Skan c = *s++; 77113941Skan } else { 7881720Sache neg = 0; 7967488Sobrien if (c == '+') 80113941Skan c = *s++; 81113941Skan } 82113941Skan if ((base == 0 || base == 16) && 8366458Sdfr c == '0' && (*s == 'x' || *s == 'X') && 84113941Skan ((s[1] >= '0' && s[1] <= '9') || 85113941Skan (s[1] >= 'A' && s[1] <= 'F') || 8666458Sdfr (s[1] >= 'a' && s[1] <= 'f'))) { 87149337Sstefanf c = s[1]; 88149337Sstefanf s += 2; 89149337Sstefanf base = 16; 90113941Skan } 91 if (base == 0) 92 base = c == '0' ? 8 : 10; 93 acc = any = 0; 94 if (base < 2 || base > 36) 95 goto noconv; 96 97 /* 98 * Compute the cutoff value between legal numbers and illegal 99 * numbers. That is the largest legal value, divided by the 100 * base. An input number that is greater than this value, if 101 * followed by a legal input character, is too big. One that 102 * is equal to this value may be valid or not; the limit 103 * between valid and invalid numbers is then based on the last 104 * digit. For instance, if the range for longs is 105 * [-2147483648..2147483647] and the input base is 10, 106 * cutoff will be set to 214748364 and cutlim to either 107 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 108 * a value > 214748364, or equal but the next digit is > 7 (or 8), 109 * the number is too big, and we will return a range error. 110 * 111 * Set 'any' if any `digits' consumed; make it negative to indicate 112 * overflow. 113 */ 114 cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX 115 : LONG_MAX; 116 cutlim = cutoff % base; 117 cutoff /= base; 118 for ( ; ; c = *s++) { 119 if (c >= '0' && c <= '9') 120 c -= '0'; 121 else if (c >= 'A' && c <= 'Z') 122 c -= 'A' - 10; 123 else if (c >= 'a' && c <= 'z') 124 c -= 'a' - 10; 125 else 126 break; 127 if (c >= base) 128 break; 129 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 130 any = -1; 131 else { 132 any = 1; 133 acc *= base; 134 acc += c; 135 } 136 } 137 if (any < 0) { 138 acc = neg ? LONG_MIN : LONG_MAX; 139 errno = ERANGE; 140 } else if (!any) { 141noconv: 142 errno = EINVAL; 143 } else if (neg) 144 acc = -acc; 145 if (endptr != NULL) 146 *endptr = (char *)(any ? s - 1 : nptr); 147 return (acc); 148} 149long 150strtol(const char * __restrict nptr, char ** __restrict endptr, int base) 151{ 152 return strtol_l(nptr, endptr, base, __get_locale()); 153} 154long double 155strtold(const char * __restrict nptr, char ** __restrict endptr) 156{ 157 return strtold_l(nptr, endptr, __get_locale()); 158} 159