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#include <arpa/inet.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
void
print_buffer_digits(char* buffer, int n)
{
char* ch = buffer;
int i;
for (i = 0; i < n && isdigit(*ch); ++i, ch++) {
printf("%c", *ch);
}
printf("\n");
}
int
main(int argc, char* argv[])
{
int sockfd, clientfd;
struct sockaddr_in addr;
socklen_t addrlen;
char buffer[1024];
int nbytes, ntotbytes;
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
addr.sin_family = AF_INET;
addr.sin_port = htons(7777);
addr.sin_addr.s_addr = INADDR_ANY;
addrlen = sizeof(addr);
if (bind(sockfd, (struct sockaddr*)&addr, addrlen) == -1) {
perror("bind");
exit(1);
}
if (listen(sockfd, 1) == -1) {
perror("listen");
exit(1);
}
while (1) {
if ((clientfd = accept(sockfd, (struct sockaddr*)&addr, &addrlen)) == -1) {
perror("accept");
continue;
}
ntotbytes = 0;
while ((nbytes = read(clientfd, buffer, sizeof(buffer) - ntotbytes)) != 0) {
if (nbytes == -1) {
perror("error reading");
goto closeclient;
}
ntotbytes += nbytes;
}
print_buffer_digits(buffer, ntotbytes);
closeclient:
close(clientfd);
}
close(sockfd);
return 0;
}
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