160 lines
2.6 KiB
C
160 lines
2.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2016 Jeremiah Orians
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include<stdlib.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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int in_set(int c, char* s);
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//CONSTANT NULL 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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if(NULL == result) return NULL;
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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 index_number(char* s, char c)
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{
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int i = 0;
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while(s[i] != c)
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{
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i = i + 1;
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if(0 == s[i]) return -1;
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}
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return i;
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}
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int toupper(int c)
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{
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if(in_set(c, "abcdefghijklmnopqrstuvwxyz")) return (c & 0xDF);
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return c;
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}
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int set_reader(char* set, int mult, char* input)
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{
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int n = 0;
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int i = 0;
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int hold;
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int negative_p = FALSE;
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if(input[0] == '-')
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{
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negative_p = TRUE;
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i = i + 1;
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}
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while(in_set(input[i], set))
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{
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n = n * mult;
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hold = index_number(set, toupper(input[i]));
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/* Input managed to change between in_set and index_number */
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if(-1 == hold) return 0;
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n = n + hold;
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i = i + 1;
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}
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/* loop exited before NULL and thus invalid input */
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if(0 != input[i]) return 0;
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if(negative_p)
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{
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n = 0 - n;
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}
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return n;
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}
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int numerate_string(char *a)
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{
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/* If NULL string */
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if(0 == a[0]) return 0;
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/* Deal with binary*/
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else if ('0' == a[0] && 'b' == a[1])
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{
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return set_reader("01", 2, a+2);
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}
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/* Deal with hex */
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else if ('0' == a[0] && 'x' == a[1])
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{
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return set_reader("0123456789ABCDEFabcdef", 16, a+2);
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}
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/* Deal with octal */
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else if('0' == a[0])
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{
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return set_reader("01234567", 8, a+1);
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}
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/* Deal with decimal */
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else
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{
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return set_reader("0123456789", 10, a);
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}
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}
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