106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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** Copyright 2001, Travis Geiselbrecht. All rights reserved.
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** Distributed under the terms of the NewOS License.
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*/
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <ctype.h>
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#define LONG_IS_INT 1
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static int hexval(char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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else if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return 0;
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}
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int atoi(const char *num)
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{
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#if !LONG_IS_INT
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// XXX fail
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#else
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return atol(num);
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#endif
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}
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unsigned int atoui(const char *num)
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{
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#if !LONG_IS_INT
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// XXX fail
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#else
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return atoul(num);
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#endif
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}
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long atol(const char *num)
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{
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long value = 0;
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int neg = 0;
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if (num[0] == '0' && num[1] == 'x') {
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// hex
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num += 2;
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while (*num && isxdigit(*num))
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value = value * 16 + hexval(*num++);
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} else {
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// decimal
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if (num[0] == '-') {
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neg = 1;
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num++;
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}
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while (*num && isdigit(*num))
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value = value * 10 + *num++ - '0';
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}
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if (neg)
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value = -value;
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return value;
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}
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unsigned long atoul(const char *num)
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{
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unsigned long value = 0;
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if (num[0] == '0' && num[1] == 'x') {
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// hex
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num += 2;
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while (*num && isxdigit(*num))
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value = value * 16 + hexval(*num++);
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} else {
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// decimal
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while (*num && isdigit(*num))
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value = value * 10 + *num++ - '0';
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}
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return value;
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}
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