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klib.c
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klib.c
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/*
* Get int representation of number in string.
* String must be null terminated.
*/
int atoi(char * str)
{
int res = 0;
for (int i = 0; str[i] != '\0'; ++i) {
if (str[i] < '0' || str[i] > '9')
return -1;
res = res * 10 + str[i] - '0';
}
return res;
}
/*
* Set buf to string representation of number in int.
*/
int itoa(char * buf, int n)
{
int m = n;
int length = 0;
while (m > 0) {
length++;
m /= 10;
}
if (n == 0) {
buf[0] = '0';
length++;
}
for (int i = length; n > 0 && i > 0; i--) {
buf[i - 1] = (n % 10) + '0';
n /= 10;
}
buf[length] = '\0';
return length;
}
/*
* Set buf to string representation of number in uint.
*/
int utoa(char * buf, unsigned int n)
{
unsigned int m = n;
int length = 0;
while (m > 0) {
length++;
m /= 10;
}
if (n == 0) {
buf[0] = '0';
length++;
}
for (int i = length; n > 0 && i > 0; i--) {
buf[i - 1] = (n % 10) + '0';
n /= 10;
}
buf[length] = '\0';
return length;
}
/*
* Returns the number of digits in the integer.
*/
int intlen(int n)
{
int len = 1;
while(n/10 != 0){
n /= 10;
len++;
}
return len;
}