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#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <limits.h>
static char* itoa(int number, size_t sz, char buffer[sz])
{
// do error handling and edge cases
if (buffer == NULL || sz == 0)
return NULL;
else if (number == 0)
return strcpy(buffer, "0");
char tmp[sz];
int idx = 0;
bool is_negative = (number < 0);
if (!is_negative) number = -number; // so we can handle INT_MIN
for (; number != 0; number/=10, idx++) {
if (sz-- == 0) return NULL;
tmp[idx] = '0' - (number % 10);
}
if (is_negative) {
if (sz-- == 0) return NULL;
tmp[idx++] = '-';
}
// reverse
for (int i=0; i<idx; i++)
buffer[idx-i-1] = tmp[i];
buffer[idx] = '\0';
return buffer;
}
int main(void)
{
char buffer[100];
int test[] = {123, 234, 0, 17, -4, -7, -17, -27, INT_MAX, INT_MIN};
size_t len = sizeof(test) / sizeof(*test);
// give it a small buffer and see how it works
for (int i=0, num; i < len; i++) {
num = test[i];
char* str = itoa(num, 2, buffer);
printf("%-10d <%s>\n", num, str);
}
// now give it the correctly-sized buffer
for (int i=0, num; i < len; i++) {
num = test[i];
char* str = itoa(num, sizeof buffer / sizeof *buffer, buffer);
printf("%-10d <%s>\n", num, str);
}
}
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