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/******************************** -*- C -*- ****************************
*
* strtoul substitute
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 1988,89,90,91,92,94,95,99,2000,2001,2002,2006
* Free Software Foundation, Inc.
* Written by Paolo Bonzini.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any later
* version.
*
* Linking GNU Smalltalk statically or dynamically with other modules is
* making a combined work based on GNU Smalltalk. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* In addition, as a special exception, the Free Software Foundation
* give you permission to combine GNU Smalltalk with free software
* programs or libraries that are released under the GNU LGPL and with
* independent programs running under the GNU Smalltalk virtual machine.
*
* You may copy and distribute such a system following the terms of the
* GNU GPL for GNU Smalltalk and the licenses of the other code
* concerned, provided that you include the source code of that other
* code when and as the GNU GPL requires distribution of source code.
*
* Note that people who make modified versions of GNU Smalltalk are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version without
* this exception; this exception also makes it possible to release a
* modified version which carries forward this exception.
*
* GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#ifndef HAVE_STRTOUL
/* Map from ASCII digits to numerical equivalents (99 for non-digit chars). */
static char value[256] = {
99, 99, 99, 99, 99, 99, 99, 99, /* control chars */
99, 99, 99, 99, 99, 99, 99, 99, /* control chars */
99, 99, 99, 99, 99, 99, 99, 99, /* control chars */
99, 99, 99, 99, 99, 99, 99, 99, /* control chars */
99, 99, 99, 99, 99, 99, 99, 99, /* punctuation */
99, 99, 99, 99, 99, 99, 99, 99, /* punctuation */
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, /* '0' - '9' */
99, 99, 99, 99, 99, 99, 99, /* punctuation */
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, /* 'A' - 'J' */
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, /* 'K' - 'T' */
30, 31, 32, 33, 34, 35, /* 'U' - 'Z' */
99, 99, 99, 99, 99, 99, /* punctuation */
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, /* 'a' - 'j' */
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, /* 'k' - 't' */
30, 31, 32, 33, 34, 35, /* 'u' - 'z' */
99, 99, 99, 99, 99, /* punctuation */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99, /* 8-bit chars */
99, 99, 99, 99, 99, 99, 99, 99 /* 8-bit chars */
};
/*
*----------------------------------------------------------------------
*
* strtoul --
*
* Convert an ASCII string into an integer.
*
* Results:
* The return value is the integer equivalent of string. If tail
* is non-NULL, then *tail is filled in with the character
* after the last one that was part of the integer. If string
* doesn't contain a valid integer value, then zero is returned
* and *tail is set to string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
unsigned long int
strtoul(char *string, char **tail, int base)
{
register unsigned char *p;
register unsigned long int result = 0, max;
register unsigned char digit;
int anyDigits = 0;
/* Skip any leading blanks. */
for (p = string; isspace(*p); p++) ;
/* Parameter checks go here. */
if (base < 0 || base > 36 || *p == '-')
{
errno = EINVAL;
if (tail)
*tail = string;
return (result);
}
/* If no base was provided, pick one from the leading characters
* of the string. */
if (base == 0)
{
base = 10;
if (*p == '0')
{
p++;
if (*p == 'x' || *p == 'X')
{
p++;
base = 16;
}
else
{
/* Set anyDigits here, otherwise "0" produces a "no digits" error. */
anyDigits = 1;
base = 8;
}
}
}
else if (base == 16)
{
/* Skip leading "0x" or "0X" from hex numbers. */
if (p[0] == '0')
p += (p[1] == 'x' || p[1] == 'X') ? 2 : 1;
}
/* Do different things for base 8, 10, 16, and other (for speed). */
if (base == 10)
for ( ; (digit = *p - '0') <= 9; p++)
{
anyDigits = 1;
if (result > (ULONG_MAX / 10 - digit))
{
result = ULONG_MAX;
errno = ERANGE;
}
result *= 10; result += digit;
}
else if (base == 16)
for ( ; (digit = value[*p]) <= 15; p++)
{
anyDigits = 1;
if (result > ((ULONG_MAX >> 4) - digit))
{
result = ULONG_MAX;
errno = ERANGE;
}
result <<= 4; result += digit;
}
else if (base == 8)
for ( ; (digit = *p - '0') <= 7; p++)
{
anyDigits = 1;
if (result > ((ULONG_MAX >> 3) - digit))
{
result = ULONG_MAX;
errno = ERANGE;
}
result <<= 3; result += digit;
}
else
for ( max = ULONG_MAX / base; (digit = value[*p]) < base; p++)
{
anyDigits = 1;
if (result > (max - digit))
{
result = ULONG_MAX;
errno = ERANGE;
}
result *= base; result += digit;
}
if (tail)
/* See if there were any digits at all. */
*tail = anyDigits ? (char *)p : string;
return (result);
}
#endif
|
