1169695Skan/*- 2169695Skan * Copyright (c) 1990 The Regents of the University of California. 3169695Skan * All rights reserved. 4169695Skan * 5169695Skan * Redistribution and use in source and binary forms, with or without 6169695Skan * modification, are permitted provided that the following conditions 7169695Skan * are met: 8169695Skan * 1. Redistributions of source code must retain the above copyright 9169695Skan * notice, this list of conditions and the following disclaimer. 10169695Skan * 2. Redistributions in binary form must reproduce the above copyright 11169695Skan * notice, this list of conditions and the following disclaimer in the 12169695Skan * documentation and/or other materials provided with the distribution. 13169695Skan * 3. [rescinded 22 July 1999] 14169695Skan * 4. Neither the name of the University nor the names of its contributors 15169695Skan * may be used to endorse or promote products derived from this software 16169695Skan * without specific prior written permission. 17169695Skan * 18169695Skan * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19169695Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20169695Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21169695Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22169695Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23169695Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24169695Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25169695Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26169695Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27169695Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28169695Skan * SUCH DAMAGE. 29169695Skan */ 30169695Skan 31169695Skan/* 32169695Skan 33169695Skan@deftypefn Supplemental {long int} strtol (const char *@var{string}, char **@var{endptr}, int @var{base}) 34169695Skan@deftypefnx Supplemental {unsigned long int} strtoul (const char *@var{string}, char **@var{endptr}, int @var{base}) 35169695Skan 36169695SkanThe @code{strtol} function converts the string in @var{string} to a 37169695Skanlong integer value according to the given @var{base}, which must be 38169695Skanbetween 2 and 36 inclusive, or be the special value 0. If @var{base} 39169695Skanis 0, @code{strtol} will look for the prefixes @code{0} and @code{0x} 40169695Skanto indicate bases 8 and 16, respectively, else default to base 10. 41169695SkanWhen the base is 16 (either explicitly or implicitly), a prefix of 42169695Skan@code{0x} is allowed. The handling of @var{endptr} is as that of 43169695Skan@code{strtod} above. The @code{strtoul} function is the same, except 44169695Skanthat the converted value is unsigned. 45169695Skan 46169695Skan@end deftypefn 47169695Skan 48169695Skan*/ 49169695Skan 50169695Skan#ifdef HAVE_CONFIG_H 51169695Skan#include "config.h" 52169695Skan#endif 53169695Skan#ifdef HAVE_LIMITS_H 54169695Skan#include <limits.h> 55169695Skan#endif 56169695Skan#ifdef HAVE_SYS_PARAM_H 57169695Skan#include <sys/param.h> 58169695Skan#endif 59169695Skan#include <errno.h> 60169695Skan#ifdef NEED_DECLARATION_ERRNO 61169695Skanextern int errno; 62169695Skan#endif 63169695Skan#include "safe-ctype.h" 64169695Skan 65169695Skan/* FIXME: It'd be nice to configure around these, but the include files are too 66169695Skan painful. These macros should at least be more portable than hardwired hex 67169695Skan constants. */ 68169695Skan 69169695Skan#ifndef ULONG_MAX 70169695Skan#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */ 71169695Skan#endif 72169695Skan 73169695Skan#ifndef LONG_MAX 74169695Skan#define LONG_MAX ((long)(ULONG_MAX >> 1)) /* 0x7FFFFFFF */ 75169695Skan#endif 76169695Skan 77169695Skan#ifndef LONG_MIN 78169695Skan#define LONG_MIN ((long)(~LONG_MAX)) /* 0x80000000 */ 79169695Skan#endif 80169695Skan 81169695Skan/* 82169695Skan * Convert a string to a long integer. 83169695Skan * 84169695Skan * Ignores `locale' stuff. Assumes that the upper and lower case 85169695Skan * alphabets and digits are each contiguous. 86169695Skan */ 87169695Skanlong 88169695Skanstrtol(const char *nptr, char **endptr, register int base) 89169695Skan{ 90169695Skan register const char *s = nptr; 91169695Skan register unsigned long acc; 92169695Skan register int c; 93169695Skan register unsigned long cutoff; 94169695Skan register int neg = 0, any, cutlim; 95169695Skan 96169695Skan /* 97169695Skan * Skip white space and pick up leading +/- sign if any. 98169695Skan * If base is 0, allow 0x for hex and 0 for octal, else 99169695Skan * assume decimal; if base is already 16, allow 0x. 100169695Skan */ 101169695Skan do { 102169695Skan c = *s++; 103169695Skan } while (ISSPACE(c)); 104169695Skan if (c == '-') { 105169695Skan neg = 1; 106169695Skan c = *s++; 107169695Skan } else if (c == '+') 108169695Skan c = *s++; 109169695Skan if ((base == 0 || base == 16) && 110169695Skan c == '0' && (*s == 'x' || *s == 'X')) { 111169695Skan c = s[1]; 112169695Skan s += 2; 113169695Skan base = 16; 114169695Skan } 115169695Skan if (base == 0) 116169695Skan base = c == '0' ? 8 : 10; 117169695Skan 118169695Skan /* 119169695Skan * Compute the cutoff value between legal numbers and illegal 120169695Skan * numbers. That is the largest legal value, divided by the 121169695Skan * base. An input number that is greater than this value, if 122169695Skan * followed by a legal input character, is too big. One that 123169695Skan * is equal to this value may be valid or not; the limit 124169695Skan * between valid and invalid numbers is then based on the last 125169695Skan * digit. For instance, if the range for longs is 126169695Skan * [-2147483648..2147483647] and the input base is 10, 127169695Skan * cutoff will be set to 214748364 and cutlim to either 128169695Skan * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 129169695Skan * a value > 214748364, or equal but the next digit is > 7 (or 8), 130169695Skan * the number is too big, and we will return a range error. 131169695Skan * 132169695Skan * Set any if any `digits' consumed; make it negative to indicate 133169695Skan * overflow. 134169695Skan */ 135169695Skan cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX; 136169695Skan cutlim = cutoff % (unsigned long)base; 137169695Skan cutoff /= (unsigned long)base; 138169695Skan for (acc = 0, any = 0;; c = *s++) { 139169695Skan if (ISDIGIT(c)) 140169695Skan c -= '0'; 141169695Skan else if (ISALPHA(c)) 142169695Skan c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10; 143169695Skan else 144169695Skan break; 145169695Skan if (c >= base) 146169695Skan break; 147169695Skan if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 148169695Skan any = -1; 149169695Skan else { 150169695Skan any = 1; 151169695Skan acc *= base; 152169695Skan acc += c; 153169695Skan } 154169695Skan } 155169695Skan if (any < 0) { 156169695Skan acc = neg ? LONG_MIN : LONG_MAX; 157169695Skan errno = ERANGE; 158169695Skan } else if (neg) 159169695Skan acc = -acc; 160169695Skan if (endptr != 0) 161169695Skan *endptr = (char *) (any ? s - 1 : nptr); 162169695Skan return (acc); 163169695Skan} 164