Add json support in packet.c

GuoWenxue

2022-04-29 8bdd4bb9f08e38b61b47caa5aa50d6912772b289

Add json support in packet.c

 apue/project_socket/src/packet.c

@@ -4,11 +4,11 @@
 *
 *       Filename:  packet.c
 *    Description:  This file is packet API functions
 *                 
 *
 *        Version:  1.0.0(18/04/22)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "18/04/22 16:30:25"
 *                 
 *
 ********************************************************************************/

#include <stdio.h>
@@ -43,14 +43,14 @@
        return -1;
    }

    snprintf(strtime, size, "%04d-%02d-%2d %02d:%02d:%02d", 
    snprintf(strtime, size, "%04d-%02d-%2d %02d:%02d:%02d",
            tnow->tm_year+1900, tnow->tm_mon+1, tnow->tm_mday,
            tnow->tm_hour, tnow->tm_min, tnow->tm_sec);

    return 0;
}

int packet_string_pack(pack_info_t *pack_info, char *pack_buf, int size)
int packet_segmented_pack(pack_info_t *pack_info, char *pack_buf, int size)
{
    if( !pack_info || !pack_buf || size<=0 )
    {
@@ -58,10 +58,29 @@
        return -1;
    }

    snprintf(pack_buf, size, "%s|%s|%d.%d", pack_info->devid, pack_info->strtime, 
    memset(pack_buf, 0, size);

    snprintf(pack_buf, size, "%s|%s|%d.%d", pack_info->devid, pack_info->strtime,
            temper_integer(pack_info->temper), temper_fract(pack_info->temper));

    return strlen(pack_buf);
}

int packet_json_pack(pack_info_t *pack_info, char *pack_buf, int size)
{
    if( !pack_info || !pack_buf || size<=0 )
    {
        log_error("Invalid input arguments\n");
        return -1;
    }

    memset(pack_buf, 0, size);

    snprintf(pack_buf, size, "{\"devid\":\"%s\", \"time\":\"%s\",\"temperature\":\"%d.%d\"}",
            pack_info->devid, pack_info->strtime,
            temper_integer(pack_info->temper), temper_fract(pack_info->temper));

    return strlen(pack_buf);
}



 apue/project_socket/src/packet.h

@@ -54,6 +54,17 @@
 *               $size     :  packet output buffer size
 * return value: <0: failure   >0: packet bytes
 */
extern int packet_string_pack(pack_info_t *pack_info, char *pack_buf, int size);
extern int packet_segmented_pack(pack_info_t *pack_info, char *pack_buf, int size);


/*  description: package a json string packet: {"devid":"xxx", "time":"xxx", "temperature":"xxx"}
 *   input args:
 *               $pack_info:  packet data contains devid, time and temperature
 *               $pack_buf :  packet output buffer
 *               $size     :  packet output buffer size
 * return value: <0: failure   >0: packet bytes
 */
extern int packet_json_pack(pack_info_t *pack_info, char *pack_buf, int size);


#endif   /* ----- #ifndef _PACKET_H_  ----- */