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#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>
#include <errno.h>
int g_status_code = 0;
void print_factors(const char *s)
{
char *endptr;
errno = 0;
unsigned long n = strtoul(s, &endptr, 10);
if (errno != 0 || !isdigit(*s) || *endptr != '\0')
{
fprintf(stderr, "factor: '%s': is not a valid positive integer\n", s);
g_status_code = 1;
return;
}
printf("%lu:", n);
while (n > 1)
{
for (unsigned long d = 2; true; d++)
{
if (n % d == 0)
{
printf(" %lu", d);
n /= d;
break;
}
}
}
fputc('\n', stdout);
}
int main(int argc, char **argv)
{
if (argc == 1)
{
char *line = NULL;
size_t n = 0;
while (getline(&line, &n, stdin) != -1)
print_factors(line);
free(line);
return g_status_code;
}
for (int i = 1; i < argc; i++)
print_factors(argv[i]);
return g_status_code;
}
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