genpw.c

#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <limits.h>

#define PASSWORD_LENGTH 10

int main(void) {
  char pwd[PASSWORD_LENGTH + 1];

	srandom(time(NULL));
	memset(pwd, 0, PASSWORD_LENGTH + 1);
	for (int i = 0; i < PASSWORD_LENGTH; ++i) {
		char c = 0;
		do {
			c = random() % SCHAR_MAX;
		} while (!isprint(c) || isspace(c));
		pwd[i] = c;
	}

	printf("%s\n", pwd);
	return 0;
}