58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include "klibc.h"
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void *memcpy(void *dst, const void *src, size_t n)
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{
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char *dstChar = dst;
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const char *srcChar = src;
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for (size_t i = 0; i < n; i++) {
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*(dstChar++) = *(srcChar++);
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}
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return dst;
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}
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void *memset(void *src, int c, size_t n)
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{
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for (char *ptr = (char *)src; n > 0; n--, ptr++) {
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*ptr = (char)c;
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}
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return src;
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}
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char * itoa( int value, char * str, int base )
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{
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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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{
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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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// Set '-' for negative decimals.
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if ( value < 0 && base == 10 )
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{
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*ptr++ = '-';
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}
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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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{
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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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{
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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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