150 lines
2.7 KiB
C
150 lines
2.7 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of M2-Planet.
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*
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* M2-Planet is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* M2-Planet is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include<stdlib.h>
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#include<string.h>
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// void* calloc(int count, int size);
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#define TRUE 1
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//CONSTANT TRUE 1
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#define FALSE 0
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//CONSTANT FALSE 0
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char* numerate_number(int a)
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{
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char* result = calloc(16, sizeof(char));
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int i = 0;
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/* Deal with Zero case */
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if(0 == a)
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{
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result[0] = '0';
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return result;
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}
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/* Deal with negatives */
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if(0 > a)
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{
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result[0] = '-';
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i = 1;
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a = a * -1;
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}
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/* Using the largest 10^n number possible in 32bits */
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int divisor = 0x3B9ACA00;
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/* Skip leading Zeros */
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while(0 == (a / divisor)) divisor = divisor / 10;
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/* Now simply collect numbers until divisor is gone */
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while(0 < divisor)
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{
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result[i] = ((a / divisor) + 48);
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a = a % divisor;
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divisor = divisor / 10;
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i = i + 1;
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}
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return result;
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}
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int char2hex(int c)
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{
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if (c >= '0' && c <= '9') return (c - 48);
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else if (c >= 'a' && c <= 'f') return (c - 87);
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else if (c >= 'A' && c <= 'F') return (c - 55);
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else return -1;
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}
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int hex2char(int c)
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{
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if((c >= 0) && (c <= 9)) return (c + 48);
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else if((c >= 10) && (c <= 15)) return (c + 55);
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else return -1;
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}
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int char2dec(int c)
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{
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if (c >= '0' && c <= '9') return (c - 48);
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else return -1;
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}
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int dec2char(int c)
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{
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if((c >= 0) && (c <= 9)) return (c + 48);
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else return -1;
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}
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int numerate_string(char *a)
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{
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int count = 0;
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int index;
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int negative;
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/* If NULL string */
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if(0 == a[0])
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{
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return 0;
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}
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/* Deal with hex */
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else if (a[0] == '0' && a[1] == 'x')
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{
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if('-' == a[2])
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{
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negative = TRUE;
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index = 3;
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}
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else
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{
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negative = FALSE;
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index = 2;
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}
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while(0 != a[index])
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{
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if(-1 == char2hex(a[index])) return 0;
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count = (16 * count) + char2hex(a[index]);
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index = index + 1;
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}
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}
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/* Deal with decimal */
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else
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{
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if('-' == a[0])
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{
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negative = TRUE;
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index = 1;
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}
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else
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{
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negative = FALSE;
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index = 0;
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}
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while(0 != a[index])
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{
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if(-1 == char2dec(a[index])) return 0;
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count = (10 * count) + char2dec(a[index]);
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index = index + 1;
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}
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}
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if(negative)
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{
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count = count * -1;
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}
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return count;
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}
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