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strtoint64.h
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/
strtoint64.h
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/*
* Converts a string into a int64_t
*
* based on OpenBSD: strtoll.c,v 1.6 2005/11/10 10:00:17 espie Exp $
*/
/*-
* Copyright (c) 1992 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. 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.
*/
#include <ctype.h>
/*
* Convert a string to an int64_t/uint64_t.
*/
static uint64_t
strtoint64(pTHX_ const char *s, int base, int sign)
{
uint64_t acc = 0;
int c, neg, between = 0;
int mdoo = may_die_on_overflow; /* we copy it to avoid a race
condition */
uint64_t upper_mul_limit = 0;
/*
* 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 = (unsigned char) *s++;
} while (isspace(c));
if (c == '-') {
neg = 1;
c = *s++;
if (!sign) overflow(aTHX_ "negative sign found when parsing unsigned number");
} else {
neg = 0;
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;
if (mdoo) upper_mul_limit = UINT64_MAX / base;
for (;; c = (unsigned char) *s++) {
if (isdigit(c))
c -= '0';
else if (isalpha(c))
c -= isupper(c) ? 'A' - 10 : 'a' - 10;
else if ((c == '_') && between)
continue; /* ignore underscores as Perl does */
else
break;
if (c >= base)
break;
if (mdoo) {
if (acc > upper_mul_limit) overflow(aTHX_ (sign ? out_of_bounds_error_s : out_of_bounds_error_u));
acc *= base;
if (UINT64_MAX - acc < c) overflow(aTHX_ (sign ? out_of_bounds_error_s : out_of_bounds_error_u));
acc += c;
}
else {
acc = acc * base + c;
}
between = 1;
}
if ( mdoo && sign &&
( acc > (neg ? (~(uint64_t)INT64_MIN + 1) : INT64_MAX) ) ) overflow(aTHX_ out_of_bounds_error_s);
return (neg ? ~acc + 1 : acc);
}