227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
/*
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FUNCTION
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<<strtol>>---string to long
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INDEX
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strtol
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INDEX
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_strtol_r
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ANSI_SYNOPSIS
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#include <stdlib.h>
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long strtol(const char *<[s]>, char **<[ptr]>,int <[base]>);
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long _strtol_r(void *<[reent]>,
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const char *<[s]>, char **<[ptr]>,int <[base]>);
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TRAD_SYNOPSIS
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#include <stdlib.h>
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long strtol (<[s]>, <[ptr]>, <[base]>)
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char *<[s]>;
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char **<[ptr]>;
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int <[base]>;
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long _strtol_r (<[reent]>, <[s]>, <[ptr]>, <[base]>)
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char *<[reent]>;
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char *<[s]>;
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char **<[ptr]>;
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int <[base]>;
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DESCRIPTION
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The function <<strtol>> converts the string <<*<[s]>>> to
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a <<long>>. First, it breaks down the string into three parts:
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leading whitespace, which is ignored; a subject string consisting
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of characters resembling an integer in the radix specified by <[base]>;
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and a trailing portion consisting of zero or more unparseable characters,
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and always including the terminating null character. Then, it attempts
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to convert the subject string into a <<long>> and returns the
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result.
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If the value of <[base]> is 0, the subject string is expected to look
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like a normal C integer constant: an optional sign, a possible `<<0x>>'
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indicating a hexadecimal base, and a number. If <[base]> is between
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2 and 36, the expected form of the subject is a sequence of letters
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and digits representing an integer in the radix specified by <[base]>,
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with an optional plus or minus sign. The letters <<a>>--<<z>> (or,
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equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35;
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only letters whose ascribed values are less than <[base]> are
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permitted. If <[base]> is 16, a leading <<0x>> is permitted.
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The subject sequence is the longest initial sequence of the input
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string that has the expected form, starting with the first
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non-whitespace character. If the string is empty or consists entirely
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of whitespace, or if the first non-whitespace character is not a
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permissible letter or digit, the subject string is empty.
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If the subject string is acceptable, and the value of <[base]> is zero,
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<<strtol>> attempts to determine the radix from the input string. A
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string with a leading <<0x>> is treated as a hexadecimal value; a string with
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a leading 0 and no <<x>> is treated as octal; all other strings are
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treated as decimal. If <[base]> is between 2 and 36, it is used as the
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conversion radix, as described above. If the subject string begins with
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a minus sign, the value is negated. Finally, a pointer to the first
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character past the converted subject string is stored in <[ptr]>, if
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<[ptr]> is not <<NULL>>.
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If the subject string is empty (or not in acceptable form), no conversion
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is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
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not <<NULL>>).
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The alternate function <<_strtol_r>> is a reentrant version. The
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extra argument <[reent]> is a pointer to a reentrancy structure.
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RETURNS
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<<strtol>> returns the converted value, if any. If no conversion was
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made, 0 is returned.
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<<strtol>> returns <<LONG_MAX>> or <<LONG_MIN>> if the magnitude of
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the converted value is too large, and sets <<errno>> to <<ERANGE>>.
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PORTABILITY
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<<strtol>> is ANSI.
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No supporting OS subroutines are required.
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*/
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <_ansi.h>
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#include <limits.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <reent.h>
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/*
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* Convert a string to a long integer.
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*
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* Ignores `locale' stuff. Assumes that the upper and lower case
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* alphabets and digits are each contiguous.
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*/
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long
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_DEFUN (_strtol_r, (rptr, nptr, endptr, base),
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struct _reent *rptr _AND
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_CONST char *nptr _AND
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char **endptr _AND
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int base)
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{
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register const char *s = nptr;
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register unsigned long acc;
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register int c;
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register unsigned long cutoff;
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register int neg = 0, any, cutlim;
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/*
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* Skip white space and pick up leading +/- sign if any.
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* If base is 0, allow 0x for hex and 0 for octal, else
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* assume decimal; if base is already 16, allow 0x.
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*/
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do {
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c = *s++;
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} while (isspace(c));
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if (c == '-') {
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neg = 1;
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c = *s++;
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} else if (c == '+')
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c = *s++;
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if ((base == 0 || base == 16) &&
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c == '0' && (*s == 'x' || *s == 'X')) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if (base == 0)
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base = c == '0' ? 8 : 10;
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/*
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* Compute the cutoff value between legal numbers and illegal
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* numbers. That is the largest legal value, divided by the
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* base. An input number that is greater than this value, if
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* followed by a legal input character, is too big. One that
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* is equal to this value may be valid or not; the limit
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* between valid and invalid numbers is then based on the last
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* digit. For instance, if the range for longs is
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* [-2147483648..2147483647] and the input base is 10,
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* cutoff will be set to 214748364 and cutlim to either
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* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
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* a value > 214748364, or equal but the next digit is > 7 (or 8),
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* the number is too big, and we will return a range error.
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*
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* Set any if any `digits' consumed; make it negative to indicate
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* overflow.
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*/
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cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
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cutlim = cutoff % (unsigned long)base;
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cutoff /= (unsigned long)base;
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for (acc = 0, any = 0;; c = *s++) {
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if (isdigit(c))
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c -= '0';
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else if (isalpha(c))
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c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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else
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break;
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if (c >= base)
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break;
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if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
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any = -1;
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else {
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any = 1;
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acc *= base;
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acc += c;
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}
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}
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if (any < 0) {
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acc = neg ? LONG_MIN : LONG_MAX;
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rptr->_errno = ERANGE;
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} else if (neg)
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acc = -acc;
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if (endptr != 0)
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*endptr = (char *) (any ? s - 1 : nptr);
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return (acc);
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}
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#ifndef _REENT_ONLY
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long
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_DEFUN (strtol, (s, ptr, base),
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_CONST char *s _AND
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char **ptr _AND
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int base)
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{
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return _strtol_r (_REENT, s, ptr, base);
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}
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#endif
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