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48 lines
880 B
48 lines
880 B
#include "conv.h"
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#include "../drivers/vga.h"
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char* itoa( int value, char * str, int base ) {
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char* rc;
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char* ptr;
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char* low;
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// Check for supported base.
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if( base < 2 || base > 36 ) {
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*str = '\0';
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return str;
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}
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rc = ptr = str;
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switch(base) {
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case 16:
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*ptr++ = '0';
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*ptr++ = 'x';
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case 10:
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if(value < 0)
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*ptr++ = '-';
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}
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// if(value < 0 && base == 10 ) // sign
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// *ptr++ = '-';
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// Remember where the numbers start.
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low = ptr;
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// The actual conversion.
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do {
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// Modulo is negative for negative value. This trick makes abs() unnecessary.
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*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + value % base];
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value /= base;
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} while(value);
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// Terminating the string.
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*ptr-- = '\0';
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// Invert the numbers.
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while ( low < ptr ) {
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char tmp = *low;
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*low++ = *ptr;
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*ptr-- = tmp;
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}
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return rc;
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}
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