PracticeDev/study_clang/zmq/zhelpers.h

/*  =====================================================================
    zhelpers.h
    Helper header file for example applications.
    =====================================================================
*/

#ifndef __ZHELPERS_H_INCLUDED__
#define __ZHELPERS_H_INCLUDED__

//  Include a bunch of headers that we will need in the examples

#include <zmq.h>

#include <assert.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#if (!defined (WIN32))
#   include <sys/time.h>
#endif

#if (defined (WIN32))
#   include <windows.h>
#endif

//  Version checking, and patch up missing constants to match 2.1
#if ZMQ_VERSION_MAJOR == 2
#   error "Please upgrade to ZeroMQ/3.2 for these examples"
#endif

//  On some version of Windows, POSIX subsystem is not installed by default.
//  So define srandom and random ourself.
#if (defined (WIN32))
#   define srandom srand
#   define random rand
#endif

//  Provide random number from 0..(num-1)
#define randof(num)  (int) ((float) (num) * random () / (RAND_MAX + 1.0))

//  Receive 0MQ string from socket and convert into C string
//  Caller must free returned string. Returns NULL if the context
//  is being terminated.
static char *
s_recv (void *socket) {
    enum { cap = 256 };
    char buffer [cap];
    int size = zmq_recv (socket, buffer, cap - 1, 0);
    if (size == -1)
        return NULL;
    buffer[size < cap ? size : cap - 1] = '\0';

#if (defined (WIN32))
    return strdup (buffer);
#else
    return strndup (buffer, sizeof(buffer) - 1);
#endif

    // remember that the strdup family of functions use malloc/alloc for space for the new string.  It must be manually
    // freed when you are done with it.  Failure to do so will allow a heap attack.
}

//  Convert C string to 0MQ string and send to socket
static int
s_send (void *socket, char *string) {
    int size = zmq_send (socket, string, strlen (string), 0);
    return size;
}

//  Sends string as 0MQ string, as multipart non-terminal
static int
s_sendmore (void *socket, char *string) {
    int size = zmq_send (socket, string, strlen (string), ZMQ_SNDMORE);
    return size;
}

//  Receives all message parts from socket, prints neatly
//
static void
s_dump (void *socket)
{
    int rc;

    zmq_msg_t message;
    rc = zmq_msg_init (&message);
    assert (rc == 0);

    puts ("----------------------------------------");
    //  Process all parts of the message
    do {
        int size = zmq_msg_recv (&message, socket, 0);
        assert (size >= 0);

        //  Dump the message as text or binary
        char *data = (char*)zmq_msg_data (&message);
        assert (data != 0);
        int is_text = 1;
        int char_nbr;
        for (char_nbr = 0; char_nbr < size; char_nbr++) {
            if ((unsigned char) data [char_nbr] < 32
                || (unsigned char) data [char_nbr] > 126) {
                is_text = 0;
            }
        }

        printf ("[%03d] ", size);
        for (char_nbr = 0; char_nbr < size; char_nbr++) {
            if (is_text) {
                printf ("%c", data [char_nbr]);
            } else {
                printf ("%02X", (unsigned char) data [char_nbr]);
            }
        }
        printf ("\n");
    } while (zmq_msg_more (&message));

    rc = zmq_msg_close (&message);
    assert (rc == 0);
}

#if (!defined (WIN32))
//  Set simple random printable identity on socket
//  Caution:
//    DO NOT call this version of s_set_id from multiple threads on MS Windows
//    since s_set_id will call rand() on MS Windows. rand(), however, is not 
//    reentrant or thread-safe. See issue #521.
static void
s_set_id (void *socket)
{
    char identity [10];
    sprintf (identity, "%04X-%04X", randof (0x10000), randof (0x10000));
    zmq_setsockopt (socket, ZMQ_IDENTITY, identity, strlen (identity));
}
#else
//  Fix #521 for MS Windows.
static void
s_set_id(void *socket, intptr_t id)
{
    char identity [10];
    sprintf(identity, "%04X", (int)id);
    zmq_setsockopt(socket, ZMQ_IDENTITY, identity, strlen(identity));
}
#endif

//  Sleep for a number of milliseconds
static void
s_sleep (int msecs)
{
#if (defined (WIN32))
    Sleep (msecs);
#else
    struct timespec t;
    t.tv_sec  =  msecs / 1000;
    t.tv_nsec = (msecs % 1000) * 1000000;
    nanosleep (&t, NULL);
#endif
}

//  Return current system clock as milliseconds
static int64_t
s_clock (void)
{
#if (defined (WIN32))
    SYSTEMTIME st;
    GetSystemTime (&st);
    return (int64_t) st.wSecond * 1000 + st.wMilliseconds;
#else
    struct timeval tv;
    gettimeofday (&tv, NULL);
    return (int64_t) (tv.tv_sec * 1000 + tv.tv_usec / 1000);
#endif
}

//  Print formatted string to stdout, prefixed by date/time and
//  terminated with a newline.

static void
s_console (const char *format, ...)
{
    time_t curtime = time (NULL);
    struct tm *loctime = localtime (&curtime);
    char *formatted = (char*)malloc (20);
    strftime (formatted, 20, "%y-%m-%d %H:%M:%S ", loctime);
    printf ("%s", formatted);
    free (formatted);

    va_list argptr;
    va_start (argptr, format);
    vprintf (format, argptr);
    va_end (argptr);
    printf ("\n");
}

#endif  //  __ZHELPERS_H_INCLUDED__