/*- * 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. [rescinded 22 July 1999] * 4. 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. */ /* @deftypefn Supplemental {long int} strtol (const char *@var{string}, char **@var{endptr}, int @var{base}) @deftypefnx Supplemental {unsigned long int} strtoul (const char *@var{string}, char **@var{endptr}, int @var{base}) The @code{strtol} function converts the string in @var{string} to a long integer value according to the given @var{base}, which must be between 2 and 36 inclusive, or be the special value 0. If @var{base} is 0, @code{strtol} will look for the prefixes @code{0} and @code{0x} to indicate bases 8 and 16, respectively, else default to base 10. When the base is 16 (either explicitly or implicitly), a prefix of @code{0x} is allowed. The handling of @var{endptr} is as that of @code{strtod} above. The @code{strtoul} function is the same, except that the converted value is unsigned. @end deftypefn */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef HAVE_LIMITS_H #include <limits.h> #endif #ifdef HAVE_SYS_PARAM_H #include <sys/param.h> #endif #include <errno.h> #ifdef NEED_DECLARATION_ERRNO extern int errno; #endif #include "safe-ctype.h" /* FIXME: It'd be nice to configure around these, but the include files are too painful. These macros should at least be more portable than hardwired hex constants. */ #ifndef ULONG_MAX #define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */ #endif #ifndef LONG_MAX #define LONG_MAX ((long)(ULONG_MAX >> 1)) /* 0x7FFFFFFF */ #endif #ifndef LONG_MIN #define LONG_MIN ((long)(~LONG_MAX)) /* 0x80000000 */ #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(nptr, endptr, base) const char *nptr; char **endptr; register int base; { register const char *s = nptr; register unsigned long acc; register int c; register unsigned long cutoff; register 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 = (char *) (any ? s - 1 : nptr); return (acc); }