added basic "consumer" example

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

examples/c-json-stdout/c-json-stdout.c

@@ -0,0 +1,52 @@
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "jsmn/jsmn.h"
+
+static char serv_listen_addr[INET_ADDRSTRLEN] = DISTRIBUTOR_HOST;
+static uint16_t serv_listen_port = DISTRIBUTOR_PORT;
+
+int main(void)
+{
+    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
+    struct sockaddr_in remote_addr = {};
+    socklen_t remote_addrlen = sizeof(remote_addr);
+    uint8_t buf[BUFSIZ];
+    //size_t buf_used = 0;
+    //unsigned long long int buf_wanted = 0;
+
+    if (sockfd < 0) {
+        perror("socket");
+        return 1;
+    }
+
+    remote_addr.sin_family = AF_INET;
+    if (inet_pton(AF_INET, &serv_listen_addr[0], &remote_addr.sin_addr) != 1) {
+        perror("inet_pton");
+        return 1;
+    }
+    remote_addr.sin_port = htons(serv_listen_port);
+
+    if (connect(sockfd, (struct sockaddr *) &remote_addr, remote_addrlen) != 0) {
+        perror("connect");
+        return 1;
+    }
+
+    while (1) {
+        errno = 0;
+        ssize_t bytes_read = read(sockfd, buf, sizeof(buf));
+
+        if (bytes_read <= 0 || errno != 0) {
+            break;
+        }
+
+        printf("RECV[%zd]: '%.*s'\n", bytes_read, (int) bytes_read, buf);
+    }
+
+    return 0;
+}