110 lines
1.7 KiB
C
110 lines
1.7 KiB
C
// conv.h
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// Author: Josh Holtrop
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// Date: 08/02/04
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// Modified: 12/30/04
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#include "conv.h"
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#include "hos_defines.h"
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// BCD to string
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// returns number of characters generated before null terminator
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int bcdtoa(u32_t bcd, char *buf)
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{
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*buf++ = ((bcd & 0xF0) >> 4) + '0';
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*buf++ = (bcd & 0xF) + '0';
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*buf = 0;
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return 2;
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}
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// convert integer to hexadecimal string
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int itox(u32_t num, char *buf)
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{
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int s, i = 0;
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for (s = 28; s >= 0; s -= 4)
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{
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u32_t val = (num >> s) & 0xF;
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if (i || val || (!s))
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{
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val = (val > 9) ? (val + 'A' - 10) : (val + '0');
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buf[i++] = val;
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}
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}
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buf[i] = 0;
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return i - 1;
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}
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// convert integer to an octal string
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int itoo(u32_t num, char *buf)
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{
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int s, i = 0;
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for (s = 30; s >= 0; s -= 3)
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{
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u32_t val = (num >> s) & 0x7;
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if (i || val || (!s))
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buf[i++] = val + '0';
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}
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buf[i] = 0;
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return i - 1;
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}
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// convert signed integer to decimal string
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int itoa(int num, char *buf)
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{
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// 4,294,967,296
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int hitNum = 0, i = 0, mod, val;
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if (num < 0)
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{
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buf[i++] = '-';
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num = -num;
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}
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for (mod = 1000000000; mod >= 1; mod /= 10)
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{
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val = num / mod;
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num %= mod;
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if (val || (mod == 1))
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hitNum = 1;
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if (hitNum)
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{
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buf[i++] = val + '0';
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}
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}
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buf[i] = 0;
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return i - 1;
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}
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// convert an unsigned integer to decimal string
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int utoa(u32_t num, char *buf)
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{
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// 4,294,967,296
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int hitNum = 0, i = 0, mod, val;
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for (mod = 1000000000; mod >= 1; mod /= 10)
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{
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val = num / mod;
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num %= mod;
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if (val || (mod == 1))
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hitNum = 1;
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if (hitNum)
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{
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buf[i++] = val + '0';
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}
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}
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buf[i] = 0;
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return i - 1;
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}
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char asciiSwitchCase(char chr)
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{
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if (chr >= 'A' && chr <= 'Z')
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return chr + ('a' - 'A');
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if (chr >= 'a' && chr <= 'z')
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return chr - ('a' - 'A');
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return chr;
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}
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