static int parent(int *pipefd, int cpid)
{
char *input;
unsigned int tx_buf;
close(pipefd[0]);
while (1) {
printf("> ");
input = foo_gets();
if (input == NULL) {
printf("ERROR: Error while reading from stdin.\n");
return -1;
}
if (!strcmp(input, "exit\n")) {
free(input);
close(pipefd[1]);
kill(cpid, SIGKILL);
return 0;
}
errno = 0;
tx_buf = strtol(input, NULL, 0);
if (errno == ERANGE)
printf("WARNING: strtol conversion out of range.\n");
free(input);
if (write(pipefd[1], &tx_buf, 4) != 4)
printf("WARNING: Not all data was written.\n");
}
}
int main(int argc, char *argv[])
{
int num, ref;
char *num_str;
if (argc > 1) {
num_str = argv[1];
} else {
size_t len;
num_str = foo_gets();
len = strlen(num_str);
if (num_str[len - 1] == '\n')
num_str[len - 1] = '\0';
}
num = my_atoi(num_str);
ref = atoi(num_str);
if (num != ref)
fprintf(stderr, "ERROR: mismatch: in:%s, out:%d, ref:%d\n",
num_str, num, ref);
else
printf("in:%s, out:%d, ref:%d\n", num_str, num, ref);
return 0;
}
int main(int argc, char *argv[])
{
char *string;
if (argc > 1) {
string = argv[1];
} else {
printf("Enter string: ");
string = foo_gets();
if (string[strlen(string) - 1] == '\n')
string[strlen(string) - 1] = '\0';
}
char *rev = revstr_new(string);
printf("in: %s\n", string);
printf("out1: %s\n", rev);
revstr_inplace(string);
if (strcmp(string, rev))
fprintf(stderr, "ERROR: results differ\n");
printf("out2: %s\n", string);
return 0;
}
int main(int argc, char *argv[])
{
int i, j, summe;
unsigned int upperbound = 1000;
unsigned int lowerbound = 1;
int divcount = 0;
int divs[100] = { 0 };
char *rline;
clock_t start = 0;
clock_t stop = 0;
printf("Searching for perfect numbers:\n");
printf("Enter lower bound for search (%u): ", lowerbound);
rline = foo_gets();
if (rline == NULL) {
printf("ERROR: Error reading from stdin");
} else {
if (strcmp(rline, "\n"))
lowerbound = strtol(rline, NULL, 0);
free(rline);
}
printf("Enter upper bound for search (%u): ", upperbound);
rline = foo_gets();
if (!rline) {
printf("ERROR: Error reading from stdin");
} else {
if (strcmp(rline, "\n"))
upperbound = strtol(rline, NULL, 0);
free(rline);
}
printf("Search range: %u..%u\n", lowerbound, upperbound);
start = clock();
for (i = lowerbound; i <= upperbound; i++) {
summe = 0;
divcount = 0;
for (j = (i >> 1); j > 0; j--) {
if ((i % j) == 0) {
summe += j;
divs[divcount++] = j;
}
if (summe > i)
break;
}
if (summe == i) {
printf("%i\t\tDivs: ", summe);
for (j = 0; j < divcount; j++)
printf("%u ", divs[j]);
printf("\n");
}
}
stop = clock();
printf("Computation time: %f\n",
(double)(stop - start) / (double)CLOCKS_PER_SEC);
return 0;
}
int main(int argc, char *argv[])
{
char *rline;
clock_t start, stop;
uintptr_t lowerbound = 2;
uintptr_t upperbound = 100;
printf("Searching for primes:\n");
printf("Enter lower bound for search (%" PRIuPTR "): ", lowerbound);
rline = foo_gets();
if (rline == NULL) {
printf("ERROR: Error reading from stdin");
} else {
if (strcmp(rline, "\n"))
lowerbound = strtol(rline, NULL, 0);
free(rline);
}
printf("Enter upper bound for search (%" PRIuPTR "): ", upperbound);
rline = foo_gets();
if (!rline) {
printf("ERROR: Error reading from stdin");
} else {
if (strcmp(rline, "\n"))
upperbound = strtol(rline, NULL, 0);
free(rline);
}
printf("Search range: %" PRIuPTR "..%" PRIuPTR "\n",
lowerbound, upperbound);
/* catch 2 as a prime */
if (lowerbound <= 2) {
printf("2\n");
}
/* only odd numbers can be prime (ignoring 2) */
lowerbound |= 1;
start = clock();
for (uintptr_t i = lowerbound; i <= upperbound; i += 2) {
bool is_prime = true;
for (uintptr_t j = 2; j <= sqrt(i); j++) {
if (i % j == 0) {
is_prime = false;
break;
}
}
if (!is_prime)
continue;
printf("%" PRIdPTR "\n", i);
}
stop = clock();
printf("Computation time: %f\n",
(double)(stop - start) / (double)CLOCKS_PER_SEC);
return 0;
}
int main(void)
{
int ret = 0;
int socket_fd;
struct sockaddr_un address;
int bytes_received, bytes_sent;
char *buf;
size_t buf_size;
if ((socket_fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
perror("ERROR: unable to create socket");
return socket_fd;
}
memset(&address, 0, sizeof(address));
address.sun_family = AF_UNIX;
strcpy(address.sun_path, SERVER_SOCK_FILE);
if (connect(socket_fd, (const struct sockaddr *)&address,
sizeof(address))) {
perror("ERROR: unable to connect");
ret = -1;
goto err_close;
}
while (1) {
printf("Enter message to transmit: ");
buf = foo_gets();
if (!buf) {
printf("ERROR: unable to create message\n");
ret = -1;
goto err_close;
}
buf_size = strlen(buf);
if (!strncmp("quit", buf, 4) || !strncmp("exit", buf, 4)) {
printf("bye\n");
ret = 0;
free(buf);
goto err_close;
}
bytes_sent = write(socket_fd, buf, buf_size - 1);
if (bytes_sent < 0) {
perror("ERROR: unable to send data");
ret = bytes_sent;
goto err_close;
} else {
printf("CLIENT: sent %d bytes\n", bytes_sent);
}
bytes_received = read(socket_fd, buf, buf_size - 1);
if (bytes_received < 0) {
perror("ERROR: unable to receive data");
ret = bytes_received;
goto err_close;
} else {
printf("CLIENT: received %d bytes\n", bytes_received);
}
buf[bytes_received] = '\0';
printf("Received message: %s\n", buf);
free(buf);
}
err_close:
close(socket_fd);
return ret;
}