taosdump.c

/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <argp.h>
#include <assert.h>
#ifndef _ALPINE
  #include <error.h>
#endif
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <wordexp.h>
#include <iconv.h>

#include "taos.h"
#include "taosmsg.h"
#include "tsclient.h"
#include "taosdef.h"
#include "tutil.h"

#include "tglobal.h"

#define COMMAND_SIZE 65536
#define DEFAULT_DUMP_FILE "taosdump.sql"

#define MAX_DBS  100

int  converStringToReadable(char *str, int size, char *buf, int bufsize);
int  convertNCharToReadable(char *str, int size, char *buf, int bufsize);
void taosDumpCharset(FILE *fp);
void taosLoadFileCharset(FILE *fp, char *fcharset);

typedef struct {
  short bytes;
  int8_t type;
} SOColInfo;

// -------------------------- SHOW DATABASE INTERFACE-----------------------
enum _show_db_index {
  TSDB_SHOW_DB_NAME_INDEX,
  TSDB_SHOW_DB_CREATED_TIME_INDEX,
  TSDB_SHOW_DB_VGROUPS_INDEX,
  TSDB_SHOW_DB_NTABLES_INDEX,
  TSDB_SHOW_DB_REPLICA_INDEX,
  TSDB_SHOW_DB_DAYS_INDEX,
  TSDB_SHOW_DB_KEEP_INDEX,
  TSDB_SHOW_DB_TABLES_INDEX,
  TSDB_SHOW_DB_ROWS_INDEX,
  TSDB_SHOW_DB_CACHE_INDEX,
  TSDB_SHOW_DB_ABLOCKS_INDEX,
  TSDB_SHOW_DB_TBLOCKS_INDEX,
  TSDB_SHOW_DB_CTIME_INDEX,
  TSDB_SHOW_DB_CLOG_INDEX,
  TSDB_SHOW_DB_COMP_INDEX,
  TSDB_MAX_SHOW_DB
};

// -----------------------------------------SHOW TABLES CONFIGURE -------------------------------------
enum _show_tables_index {
  TSDB_SHOW_TABLES_NAME_INDEX,
  TSDB_SHOW_TABLES_CREATED_TIME_INDEX,
  TSDB_SHOW_TABLES_COLUMNS_INDEX,
  TSDB_SHOW_TABLES_METRIC_INDEX,
  TSDB_MAX_SHOW_TABLES
};

// ---------------------------------- DESCRIBE METRIC CONFIGURE ------------------------------
enum _describe_table_index {
  TSDB_DESCRIBE_METRIC_FIELD_INDEX,
  TSDB_DESCRIBE_METRIC_TYPE_INDEX,
  TSDB_DESCRIBE_METRIC_LENGTH_INDEX,
  TSDB_DESCRIBE_METRIC_NOTE_INDEX,
  TSDB_MAX_DESCRIBE_METRIC
};

typedef struct {
  char field[TSDB_COL_NAME_LEN];
  char type[16];
  int length;
  char note[128];
} SColDes;

typedef struct {
  char name[TSDB_COL_NAME_LEN];
  SColDes cols[];
} STableDef;

extern char version[];

typedef struct {
  char name[TSDB_DB_NAME_LEN];
  int32_t replica;
  int32_t days;
  int32_t keep;
  int32_t tables;
  int32_t rows;
  int32_t cache;
  int32_t ablocks;
  int32_t tblocks;
  int32_t ctime;
  int32_t clog;
  int32_t comp;
} SDbInfo;

typedef struct {
  char name[TSDB_TABLE_NAME_LEN];
  char metric[TSDB_TABLE_NAME_LEN];
} STableRecord;

typedef struct {
  bool isMetric;
  STableRecord tableRecord;
} STableRecordInfo;

SDbInfo **dbInfos = NULL;

const char *argp_program_version = version;
const char *argp_program_bug_address = "<support@taosdata.com>";

/* Program documentation. */
static char doc[] = "";
/* "Argp example #4 -- a program with somewhat more complicated\ */
/*         options\ */
/*         \vThis part of the documentation comes *after* the options;\ */
/*         note that the text is automatically filled, but it's possible\ */
/*         to force a line-break, e.g.\n<-- here."; */

/* A description of the arguments we accept. */
static char args_doc[] = "dbname [tbname ...]\n--databases dbname ...\n--all-databases\n-i input_file";

/* Keys for options without short-options. */
#define OPT_ABORT 1 /* –abort */

/* The options we understand. */
static struct argp_option options[] = {
  // connection option
  {"host",          'h', "HOST",       0, "Server host dumping data from. Default is localhost.",     0},
  {"user",          'u', "USER",       0, "User name used to connect to server. Default is root.",    0},
  {"password",      'p', "PASSWORD",   0, "User password to connect to server. Default is taosdata.", 0},
  {"port",          'P', "PORT",       0, "Port to connect",                                          0},
  // input/output file
  {"output",        'o', "OUTPUT",     0, "Output file name.",                                        1},
  {"input",         'i', "INPUT",      0, "Input file name.",                                         1},
  {"config",        'c', "CONFIG_DIR", 0, "Configure directory. Default is /etc/taos/taos.cfg.",      1},
  {"encode", 'e', "ENCODE", 0, "Input file encoding.", 1},
  // dump unit options
  {"all-databases", 'A', 0,            0, "Dump all databases.",                                      2},
  {"databases",     'B', 0,            0, "Dump assigned databases",                                  2},
  // dump format options
  {"schemaonly",    's', 0,            0, "Only dump schema.",                                        3},
  {"with-property", 'M', 0,            0, "Dump schema with properties.",                             3},
  {"start-time",    'S', "START_TIME", 0, "Start time to dump.",                                      3},
  {"end-time",      'E', "END_TIME",   0, "End time to dump.",                                        3},
  {"data-batch",    'N', "DATA_BATCH", 0, "Number of data point per insert statement. Default is 1.", 3},
  {"allow-sys",     'a', 0,            0, "Allow to dump sys database",                               3},
  {0}};

/* Used by main to communicate with parse_opt. */
typedef struct SDumpArguments {
  // connection option
  char *host;
  char *user;
  char *password;
  uint16_t port;
  // output file
  char output[TSDB_FILENAME_LEN];
  char input[TSDB_FILENAME_LEN];
  char *encode;
  // dump unit option
  bool all_databases;
  bool databases;
  // dump format option
  bool schemaonly;
  bool with_property;
  int64_t start_time;
  int64_t end_time;
  int data_batch;
  bool allow_sys;
  // other options
  int abort;
  char **arg_list;
  int arg_list_len;
  bool isDumpIn;
} SDumpArguments;

/* Parse a single option. */
static error_t parse_opt(int key, char *arg, struct argp_state *state) {
  /* Get the input argument from argp_parse, which we
     know is a pointer to our arguments structure. */
  SDumpArguments *arguments = state->input;
  wordexp_t full_path;

  switch (key) {
    // connection option
    case 'a':
      arguments->allow_sys = true;
      break;
    case 'h':
      arguments->host = arg;
      break;
    case 'u':
      arguments->user = arg;
      break;
    case 'p':
      arguments->password = arg;
      break;
    case 'P':
      arguments->port = atoi(arg);
      break;
    // output file
    case 'o':
      if (wordexp(arg, &full_path, 0) != 0) {
        fprintf(stderr, "Invalid path %s\n", arg);
        return -1;
      }
      tstrncpy(arguments->output, full_path.we_wordv[0], TSDB_FILENAME_LEN);
      wordfree(&full_path);
      break;
    case 'i':
      arguments->isDumpIn = true;
      if (wordexp(arg, &full_path, 0) != 0) {
        fprintf(stderr, "Invalid path %s\n", arg);
        return -1;
      }
      tstrncpy(arguments->input, full_path.we_wordv[0], TSDB_FILENAME_LEN);
      wordfree(&full_path);
      break;
    case 'c':
      if (wordexp(arg, &full_path, 0) != 0) {
        fprintf(stderr, "Invalid path %s\n", arg);
        return -1;
      }
      tstrncpy(configDir, full_path.we_wordv[0], TSDB_FILENAME_LEN);
      wordfree(&full_path);
      break;
    case 'e':
      arguments->encode = arg;
      break;
    // dump unit option
    case 'A':
      arguments->all_databases = true;
      break;
    case 'B':
      arguments->databases = true;
      break;
    // dump format option
    case 's':
      arguments->schemaonly = true;
      break;
    case 'M':
      arguments->with_property = true;
      break;
    case 'S':
      // parse time here.
      arguments->start_time = atol(arg);
      break;
    case 'E':
      arguments->end_time = atol(arg);
      break;
    case 'N':
      arguments->data_batch = atoi(arg);
      break;
    case OPT_ABORT:
      arguments->abort = 1;
      break;
    case ARGP_KEY_ARG:
      arguments->arg_list = &state->argv[state->next - 1];
      arguments->arg_list_len = state->argc - state->next + 1;
      state->next = state->argc;
      break;

    default:
      return ARGP_ERR_UNKNOWN;
  }
  return 0;
}

/* Our argp parser. */
static struct argp argp = {options, parse_opt, args_doc, doc};

TAOS *taos = NULL;
char *command = NULL;
char *lcommand = NULL;
char *buffer = NULL;

int taosDumpOut(SDumpArguments *arguments);

int taosDumpIn(SDumpArguments *arguments);

void taosDumpCreateDbClause(SDbInfo *dbInfo, bool isDumpProperty, FILE *fp);

int taosDumpDb(SDbInfo *dbInfo, SDumpArguments *arguments, FILE *fp);

void taosDumpCreateTableClause(STableDef *tableDes, int numOfCols, SDumpArguments *arguments, FILE *fp);

void taosDumpCreateMTableClause(STableDef *tableDes, char *metric, int numOfCols, SDumpArguments *arguments,
                                   FILE *fp);

int32_t taosDumpTable(char *table, char *metric, SDumpArguments *arguments, FILE *fp);

int32_t taosDumpMetric(char *metric, SDumpArguments *arguments, FILE *fp);

int taosDumpTableData(FILE *fp, char *tbname, SDumpArguments *arguments);

int taosCheckParam(SDumpArguments *arguments);

void taosFreeDbInfos();

int main(int argc, char *argv[]) {
  SDumpArguments arguments = {
    // connection option
    NULL, TSDB_DEFAULT_USER, TSDB_DEFAULT_PASS, 0,
    // output file
    DEFAULT_DUMP_FILE, DEFAULT_DUMP_FILE, NULL,
    // dump unit option
    false, false,
    // dump format option
    false, false, 0, INT64_MAX, 1, false,
    // other options
    0, NULL, 0, false};

  /* Parse our arguments; every option seen by parse_opt will be
     reflected in arguments. */
  argp_parse(&argp, argc, argv, 0, 0, &arguments);

  if (arguments.abort) {
    #ifndef _ALPINE
      error(10, 0, "ABORTED");
    #else
      abort();
    #endif
  }

  if (taosCheckParam(&arguments) < 0) {
    exit(EXIT_FAILURE);
  }

  if (arguments.isDumpIn) {
    if (taosDumpIn(&arguments) < 0) return -1;
  } else {
    if (taosDumpOut(&arguments) < 0) return -1;
  }

  return 0;
}

void taosFreeDbInfos() {
  if (dbInfos == NULL) return;
  for (int i = 0; i < MAX_DBS; i++) tfree(dbInfos[i]);
  tfree(dbInfos);
}

int taosGetTableRecordInfo(char *table, STableRecordInfo *pTableRecordInfo) {
  TAOS_ROW row = NULL;
  bool isSet = false;

  memset(pTableRecordInfo, 0, sizeof(STableRecordInfo));

  sprintf(command, "show tables like %s", table);
  TAOS_RES *result = taos_query(taos, command);\
  int32_t code = taos_errno(result);

  if (code != 0) {
    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    return -1;
  }

  TAOS_FIELD *fields = taos_fetch_fields(result);

  if ((row = taos_fetch_row(result)) != NULL) {
    isSet = true;
    pTableRecordInfo->isMetric = false;
    strncpy(pTableRecordInfo->tableRecord.name, (char *)row[TSDB_SHOW_TABLES_NAME_INDEX],
            fields[TSDB_SHOW_TABLES_NAME_INDEX].bytes);
    strncpy(pTableRecordInfo->tableRecord.metric, (char *)row[TSDB_SHOW_TABLES_METRIC_INDEX],
            fields[TSDB_SHOW_TABLES_METRIC_INDEX].bytes);
  }

  taos_free_result(result);
  result = NULL;

  if (isSet) return 0;

  sprintf(command, "show stables like %s", table);

  result = taos_query(taos, command);
  code = taos_errno(result);
  if (code != 0) {
    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    return -1;
  }

  if ((row = taos_fetch_row(result)) != NULL) {
    isSet = true;
    pTableRecordInfo->isMetric = true;
    tstrncpy(pTableRecordInfo->tableRecord.metric, table, TSDB_TABLE_NAME_LEN);
  }

  taos_free_result(result);
  result = NULL;

  if (isSet) return 0;

  fprintf(stderr, "invalid table/metric %s\n", table);
  return -1;
}

int taosDumpOut(SDumpArguments *arguments) {
  TAOS_ROW row;
  TAOS_RES* result = NULL;
  char *temp = NULL;
  FILE *fp = NULL;
  int count = 0;
  STableRecordInfo tableRecordInfo;

  fp = fopen(arguments->output, "w");
  if (fp == NULL) {
    fprintf(stderr, "failed to open file %s\n", arguments->output);
    return -1;
  }

  dbInfos = (SDbInfo **)calloc(MAX_DBS, sizeof(SDbInfo *));
  if (dbInfos == NULL) {
    fprintf(stderr, "failed to allocate memory\n");
    goto _exit_failure;
  }

  temp = (char *)malloc(2 * COMMAND_SIZE);
  if (temp == NULL) {
    fprintf(stderr, "failed to allocate memory\n");
    goto _exit_failure;
  }

  command = temp;
  buffer = command + COMMAND_SIZE;

  /* Connect to server */
  taos = taos_connect(arguments->host, arguments->user, arguments->password, NULL, arguments->port);
  if (taos == NULL) {
    fprintf(stderr, "failed to connect to TDengine server\n");
    goto _exit_failure;
  }

  /* --------------------------------- Main Code -------------------------------- */
  /* if (arguments->databases || arguments->all_databases) { // dump part of databases or all databases */
  /*  */
  taosDumpCharset(fp);

  sprintf(command, "show databases");
  result = taos_query(taos, command);
  int32_t code = taos_errno(result);
  if (code != 0) {
    fprintf(stderr, "failed to run command: %s, reason: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    goto _exit_failure;
  }

  TAOS_FIELD *fields = taos_fetch_fields(result);

  while ((row = taos_fetch_row(result)) != NULL) {
    if (strncasecmp(row[TSDB_SHOW_DB_NAME_INDEX], "monitor", fields[TSDB_SHOW_DB_NAME_INDEX].bytes) == 0 &&
        (!arguments->allow_sys))
      continue;

    if (arguments->databases) {
      for (int i = 0; arguments->arg_list[i]; i++) {
        if (strncasecmp(arguments->arg_list[i], (char *)row[TSDB_SHOW_DB_NAME_INDEX],
                        fields[TSDB_SHOW_DB_NAME_INDEX].bytes) == 0)
          goto _dump_db_point;
      }
      continue;
    } else if (!arguments->all_databases) {
      if (strncasecmp(arguments->arg_list[0], (char *)row[TSDB_SHOW_DB_NAME_INDEX],
                      fields[TSDB_SHOW_DB_NAME_INDEX].bytes) == 0)
        goto _dump_db_point;
      else
        continue;
    }

  _dump_db_point:

    dbInfos[count] = (SDbInfo *)calloc(1, sizeof(SDbInfo));
    if (dbInfos[count] == NULL) {
      fprintf(stderr, "failed to allocate memory\n");
      goto _exit_failure;
    }

    strncpy(dbInfos[count]->name, (char *)row[TSDB_SHOW_DB_NAME_INDEX], fields[TSDB_SHOW_DB_NAME_INDEX].bytes);
    if (strcmp(arguments->user, TSDB_DEFAULT_USER) == 0) {
      dbInfos[count]->replica = (int)(*((int16_t *)row[TSDB_SHOW_DB_REPLICA_INDEX]));
      dbInfos[count]->days = (int)(*((int16_t *)row[TSDB_SHOW_DB_DAYS_INDEX]));
      dbInfos[count]->keep = *((int *)row[TSDB_SHOW_DB_KEEP_INDEX]);
      dbInfos[count]->tables = *((int *)row[TSDB_SHOW_DB_TABLES_INDEX]);
      dbInfos[count]->rows = *((int *)row[TSDB_SHOW_DB_ROWS_INDEX]);
      dbInfos[count]->cache = *((int *)row[TSDB_SHOW_DB_CACHE_INDEX]);
      dbInfos[count]->ablocks = *((int *)row[TSDB_SHOW_DB_ABLOCKS_INDEX]);
      dbInfos[count]->tblocks = (int)(*((int16_t *)row[TSDB_SHOW_DB_TBLOCKS_INDEX]));
      dbInfos[count]->ctime = *((int *)row[TSDB_SHOW_DB_CTIME_INDEX]);
      dbInfos[count]->clog = (int)(*((int8_t *)row[TSDB_SHOW_DB_CLOG_INDEX]));
      dbInfos[count]->comp = (int)(*((int8_t *)row[TSDB_SHOW_DB_COMP_INDEX]));
    }

    count++;

    if (arguments->databases) {
      if (count > arguments->arg_list_len) break;

    } else if (!arguments->all_databases) {
      if (count >= 1) break;
    }
  }

  // taos_free_result(result);

  if (count == 0) {
    fprintf(stderr, "No databases valid to dump\n");
    goto _exit_failure;
  }

  if (arguments->databases || arguments->all_databases) {
    for (int i = 0; i < count; i++) {
      (void)taosDumpDb(dbInfos[i], arguments, fp);
    }
  } else {
    if (arguments->arg_list_len == 1) {
      (void)taosDumpDb(dbInfos[0], arguments, fp);
    } else {
      taosDumpCreateDbClause(dbInfos[0], arguments->with_property, fp);

      sprintf(command, "use %s", dbInfos[0]->name);
      if (taos_query(taos, command) == NULL ) {
        fprintf(stderr, "invalid database %s\n", dbInfos[0]->name);
        goto _exit_failure;
      }

      fprintf(fp, "USE %s;\n\n", dbInfos[0]->name);

      for (int i = 1; arguments->arg_list[i]; i++) {
        if (taosGetTableRecordInfo(arguments->arg_list[i], &tableRecordInfo) < 0) {
          fprintf(stderr, "invalide table %s\n", arguments->arg_list[i]);
          continue;
        }

        if (tableRecordInfo.isMetric) {  // dump whole metric
          (void)taosDumpMetric(tableRecordInfo.tableRecord.metric, arguments, fp);
        } else {  // dump MTable and NTable
          (void)taosDumpTable(tableRecordInfo.tableRecord.name, tableRecordInfo.tableRecord.metric, arguments, fp);
        }
      }
    }
  }

  /* Close the handle and return */
  fclose(fp);
  taos_close(taos);
  taos_free_result(result);
  tfree(temp);
  taosFreeDbInfos();
  return 0;

_exit_failure:
  fclose(fp);
  taos_close(taos);
  taos_free_result(result);
  tfree(temp);
  taosFreeDbInfos();
  return -1;
}

void taosDumpCreateDbClause(SDbInfo *dbInfo, bool isDumpProperty, FILE *fp) {
  char *pstr = buffer;

  pstr += sprintf(pstr, "CREATE DATABASE IF NOT EXISTS %s", dbInfo->name);
  if (isDumpProperty) {
    pstr += sprintf(pstr,
        " REPLICA %d DAYS %d KEEP %d TABLES %d ROWS %d CACHE %d ABLOCKS %d TBLOCKS %d CTIME %d CLOG %d COMP %d",
        dbInfo->replica, dbInfo->days, dbInfo->keep, dbInfo->tables, dbInfo->rows, dbInfo->cache,
        dbInfo->ablocks, dbInfo->tblocks, dbInfo->ctime, dbInfo->clog, dbInfo->comp);
  }

  fprintf(fp, "%s\n\n", buffer);
}

int taosDumpDb(SDbInfo *dbInfo, SDumpArguments *arguments, FILE *fp) {
  TAOS_ROW row;
  int fd = -1;
  STableRecord tableRecord;

  taosDumpCreateDbClause(dbInfo, arguments->with_property, fp);

  sprintf(command, "use %s", dbInfo->name);
  if (taos_errno(taos_query(taos, command)) != 0) {
    fprintf(stderr, "invalid database %s\n", dbInfo->name);
    return -1;
  }

  fprintf(fp, "USE %s\n\n", dbInfo->name);

  sprintf(command, "show tables");
  TAOS_RES* result = taos_query(taos,command);
  int32_t code = taos_errno(result);
  if (code != 0) {
    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    return -1;
  }

  TAOS_FIELD *fields = taos_fetch_fields(result);

  fd = open(".table.tmp", O_RDWR | O_CREAT, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH);
  if (fd == -1) {
    fprintf(stderr, "failed to open temp file\n");
    taos_free_result(result);
    return -1;
  }

  while ((row = taos_fetch_row(result)) != NULL) {
    memset(&tableRecord, 0, sizeof(STableRecord));
    strncpy(tableRecord.name, (char *)row[TSDB_SHOW_TABLES_NAME_INDEX], fields[TSDB_SHOW_TABLES_NAME_INDEX].bytes);
    strncpy(tableRecord.metric, (char *)row[TSDB_SHOW_TABLES_METRIC_INDEX], fields[TSDB_SHOW_TABLES_METRIC_INDEX].bytes);

    twrite(fd, &tableRecord, sizeof(STableRecord));
  }

  taos_free_result(result);

  (void)lseek(fd, 0, SEEK_SET);

  STableRecord tableInfo;
  while (1) {
    memset(&tableInfo, 0, sizeof(STableRecord));
    ssize_t ret = read(fd, &tableInfo, sizeof(STableRecord));
    if (ret <= 0) break;
    
    tableInfo.name[sizeof(tableInfo.name) - 1] = 0;
    tableInfo.metric[sizeof(tableInfo.metric) - 1] = 0;
    taosDumpTable(tableInfo.name, tableInfo.metric, arguments, fp);
  }

  close(fd);
  (void)remove(".table.tmp");

  return 0;
}

void taosDumpCreateTableClause(STableDef *tableDes, int numOfCols, SDumpArguments *arguments, FILE *fp) {
  char *pstr = NULL;
  pstr = buffer;
  int counter = 0;
  int count_temp = 0;

  pstr += sprintf(buffer, "CREATE TABLE IF NOT EXISTS %s", tableDes->name);

  for (; counter < numOfCols; counter++) {
    if (tableDes->cols[counter].note[0] != '\0') break;

    if (counter == 0) {
      pstr += sprintf(pstr, " (%s %s", tableDes->cols[counter].field, tableDes->cols[counter].type);
    } else {
      pstr += sprintf(pstr, ", %s %s", tableDes->cols[counter].field, tableDes->cols[counter].type);
    }

    if (strcasecmp(tableDes->cols[counter].type, "binary") == 0 ||
        strcasecmp(tableDes->cols[counter].type, "nchar") == 0) {
      pstr += sprintf(pstr, "(%d)", tableDes->cols[counter].length);
    }
  }

  count_temp = counter;

  for (; counter < numOfCols; counter++) {
    if (counter == count_temp) {
      pstr += sprintf(pstr, ") TAGS (%s %s", tableDes->cols[counter].field, tableDes->cols[counter].type);
    } else {
      pstr += sprintf(pstr, ", %s %s", tableDes->cols[counter].field, tableDes->cols[counter].type);
    }

    if (strcasecmp(tableDes->cols[counter].type, "binary") == 0 ||
        strcasecmp(tableDes->cols[counter].type, "nchar") == 0) {
      pstr += sprintf(pstr, "(%d)", tableDes->cols[counter].length);
    }
  }

  pstr += sprintf(pstr, ")");

  fprintf(fp, "%s\n\n", buffer);
}

void taosDumpCreateMTableClause(STableDef *tableDes, char *metric, int numOfCols, SDumpArguments *arguments,
                                FILE *fp) {
  char *pstr = NULL;
  pstr = buffer;
  int counter = 0;
  int count_temp = 0;

  pstr += sprintf(buffer, "CREATE TABLE IF NOT EXISTS %s USING %s TAGS (", tableDes->name, metric);

  for (; counter < numOfCols; counter++) {
    if (tableDes->cols[counter].note[0] != '\0') break;
  }

  assert(counter < numOfCols);
  count_temp = counter;

  for (; counter < numOfCols; counter++) {
    TAOS_ROW row = NULL;

    sprintf(command, "select %s from %s limit 1", tableDes->cols[counter].field, tableDes->name);

    TAOS_RES* result = taos_query(taos, command);
    int32_t code = taos_errno(result);
    if (code != 0) {
      fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
      return;
    }

    TAOS_FIELD *fields = taos_fetch_fields(result);

    row = taos_fetch_row(result);
    switch (fields[0].type) {
      case TSDB_DATA_TYPE_BOOL:
        sprintf(tableDes->cols[counter].note, "%d", ((((int)(*((char *)row[0]))) == 1) ? 1 : 0));
        break;
      case TSDB_DATA_TYPE_TINYINT:
        sprintf(tableDes->cols[counter].note, "%d", (int)(*((char *)row[0])));
        break;
      case TSDB_DATA_TYPE_SMALLINT:
        sprintf(tableDes->cols[counter].note, "%d", (int)(*((short *)row[0])));
        break;
      case TSDB_DATA_TYPE_INT:
        sprintf(tableDes->cols[counter].note, "%d", *((int *)row[0]));
        break;
      case TSDB_DATA_TYPE_BIGINT:
        sprintf(tableDes->cols[counter].note, "%" PRId64 "", *((int64_t *)row[0]));
        break;
      case TSDB_DATA_TYPE_FLOAT:
        sprintf(tableDes->cols[counter].note, "%f", GET_FLOAT_VAL(row[0]));
        break;
      case TSDB_DATA_TYPE_DOUBLE:
        sprintf(tableDes->cols[counter].note, "%f", GET_DOUBLE_VAL(row[0]));
        break;
      case TSDB_DATA_TYPE_TIMESTAMP:
        sprintf(tableDes->cols[counter].note, "%" PRId64 "", *(int64_t *)row[0]);
        break;
      case TSDB_DATA_TYPE_BINARY:
      case TSDB_DATA_TYPE_NCHAR:
      default:
        strncpy(tableDes->cols[counter].note, (char *)row[0], fields[0].bytes);
        break;
    }

    taos_free_result(result);

    if (counter != count_temp) {
      if (strcasecmp(tableDes->cols[counter].type, "binary") == 0 ||
          strcasecmp(tableDes->cols[counter].type, "nchar") == 0) {
        pstr += sprintf(pstr, ", \'%s\'", tableDes->cols[counter].note);
      } else {
        pstr += sprintf(pstr, ", %s", tableDes->cols[counter].note);
      }
    } else {
      if (strcasecmp(tableDes->cols[counter].type, "binary") == 0 ||
          strcasecmp(tableDes->cols[counter].type, "nchar") == 0) {
        pstr += sprintf(pstr, "\'%s\'", tableDes->cols[counter].note);
      } else {
        pstr += sprintf(pstr, "%s", tableDes->cols[counter].note);
      }
      /* pstr += sprintf(pstr, "%s", tableDes->cols[counter].note); */
    }

    /* if (strcasecmp(tableDes->cols[counter].type, "binary") == 0 || strcasecmp(tableDes->cols[counter].type, "nchar")
     * == 0) { */
    /*     pstr += sprintf(pstr, "(%d)", tableDes->cols[counter].length); */
    /* } */
  }

  pstr += sprintf(pstr, ")");

  fprintf(fp, "%s\n\n", buffer);
}

int taosGetTableDes(char *table, STableDef *tableDes) {
  TAOS_ROW row = NULL;
  int count = 0;

  sprintf(command, "describe %s", table);

  TAOS_RES* result = taos_query(taos, command);
  int32_t code = taos_errno(result);
  if (code != 0) {
    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    return -1;
  }

  TAOS_FIELD *fields = taos_fetch_fields(result);

  tstrncpy(tableDes->name, table, TSDB_COL_NAME_LEN);

  while ((row = taos_fetch_row(result)) != NULL) {
    strncpy(tableDes->cols[count].field, (char *)row[TSDB_DESCRIBE_METRIC_FIELD_INDEX],
            fields[TSDB_DESCRIBE_METRIC_FIELD_INDEX].bytes);
    strncpy(tableDes->cols[count].type, (char *)row[TSDB_DESCRIBE_METRIC_TYPE_INDEX],
            fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes);
    tableDes->cols[count].length = *((int *)row[TSDB_DESCRIBE_METRIC_LENGTH_INDEX]);
    strncpy(tableDes->cols[count].note, (char *)row[TSDB_DESCRIBE_METRIC_NOTE_INDEX],
            fields[TSDB_DESCRIBE_METRIC_NOTE_INDEX].bytes);

    count++;
  }

  taos_free_result(result);
  result = NULL;

  return count;
}

int32_t taosDumpTable(char *table, char *metric, SDumpArguments *arguments, FILE *fp) {
  int count = 0;

  STableDef *tableDes = (STableDef *)calloc(1, sizeof(STableDef) + sizeof(SColDes) * TSDB_MAX_COLUMNS);

  if (metric != NULL && metric[0] != '\0') {  // dump metric definition
    count = taosGetTableDes(metric, tableDes);

    if (count < 0) {
      free(tableDes);
      return -1;
    }

    taosDumpCreateTableClause(tableDes, count, arguments, fp);

    memset(tableDes, 0, sizeof(STableDef) + sizeof(SColDes) * TSDB_MAX_COLUMNS);

    count = taosGetTableDes(table, tableDes);

    if (count < 0) {
      free(tableDes);
      return -1;
    }

    taosDumpCreateMTableClause(tableDes, metric, count, arguments, fp);

  } else {  // dump table definition
    count = taosGetTableDes(table, tableDes);

    if (count < 0) {
      free(tableDes);
      return -1;
    }

    taosDumpCreateTableClause(tableDes, count, arguments, fp);
  }

  free(tableDes);

  return taosDumpTableData(fp, table, arguments);
}

int32_t taosDumpMetric(char *metric, SDumpArguments *arguments, FILE *fp) {
  TAOS_ROW row = NULL;
  int fd = -1;
  STableRecord tableRecord;

  //tstrncpy(tableRecord.metric, metric, TSDB_TABLE_NAME_LEN);

  sprintf(command, "select tbname from %s", metric);
  TAOS_RES* result = taos_query(taos, command);
  int32_t code = taos_errno(result);
  if (code != 0) {
    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    return -1;
  }

  fd = open(".table.tmp", O_RDWR | O_CREAT, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH);
  if (fd < 0) {
    fprintf(stderr, "failed to open temp file");
    return -1;
  }

  TAOS_FIELD *fields = taos_fetch_fields(result);

  while ((row = taos_fetch_row(result)) != NULL) {
    memset(&tableRecord, 0, sizeof(STableRecord));
    tstrncpy(tableRecord.name, (char *)row[0], fields[0].bytes);
    tstrncpy(tableRecord.metric, metric, TSDB_TABLE_NAME_LEN);
    twrite(fd, &tableRecord, sizeof(STableRecord));
  }

  taos_free_result(result);
  result = NULL;

  (void)lseek(fd, 0, SEEK_SET);

  STableRecord tableInfo;
  char tableName[TSDB_TABLE_NAME_LEN] ;
  char metricName[TSDB_TABLE_NAME_LEN];
  while (1) {    
    memset(&tableInfo, 0, sizeof(STableRecord));      
    memset(tableName, 0, TSDB_TABLE_NAME_LEN);    
    memset(metricName, 0, TSDB_TABLE_NAME_LEN);
    ssize_t ret = read(fd, &tableInfo, sizeof(STableRecord));
    if (ret <= 0) break;
    
    //tableInfo.name[sizeof(tableInfo.name) - 1] = 0;
    //tableInfo.metric[sizeof(tableInfo.metric) - 1] = 0;    
    //taosDumpTable(tableInfo.name, tableInfo.metric, arguments, fp);
    tstrncpy(tableName, tableInfo.name, TSDB_TABLE_NAME_LEN-1);
    tstrncpy(metricName, tableInfo.metric, TSDB_TABLE_NAME_LEN-1);
    taosDumpTable(tableName, metricName, arguments, fp);
  }

  close(fd);
  (void)remove(".table.tmp");

  return 0;
}

int taosDumpTableData(FILE *fp, char *tbname, SDumpArguments *arguments) {
  /* char       temp[MAX_COMMAND_SIZE] = "\0"; */
  int count = 0;
  char *pstr = NULL;
  TAOS_ROW row = NULL;
  int numFields = 0;
  char *tbuf = NULL;

  if (arguments->schemaonly) return 0;

  sprintf(command, "select * from %s where _c0 >= %" PRId64 " and _c0 <= %" PRId64 " order by _c0 asc", tbname, arguments->start_time,
          arguments->end_time);
          
  TAOS_RES* result = taos_query(taos, command);
  int32_t code = taos_errno(result);
  if (code != 0) {
    fprintf(stderr, "failed to run command %s, reason: %s\n", command, taos_errstr(result));
    taos_free_result(result);
    return -1;
  }

  numFields = taos_field_count(result);
  assert(numFields > 0);
  TAOS_FIELD *fields = taos_fetch_fields(result);
  tbuf = (char *)malloc(COMMAND_SIZE);
  if (tbuf == NULL) {
    fprintf(stderr, "No enough memory\n");
    return -1;
  }

  count = 0;
  while ((row = taos_fetch_row(result)) != NULL) {
    pstr = buffer;

    if (count == 0) {
      pstr += sprintf(pstr, "INSERT INTO %s VALUES (", tbname);
    } else {
      pstr += sprintf(pstr, "(");
    }

    for (int col = 0; col < numFields; col++) {
      if (col != 0) pstr += sprintf(pstr, ", ");

      if (row[col] == NULL) {
        pstr += sprintf(pstr, "NULL");
        continue;
      }

      switch (fields[col].type) {
        case TSDB_DATA_TYPE_BOOL:
          pstr += sprintf(pstr, "%d", ((((int)(*((char *)row[col]))) == 1) ? 1 : 0));
          break;
        case TSDB_DATA_TYPE_TINYINT:
          pstr += sprintf(pstr, "%d", (int)(*((char *)row[col])));
          break;
        case TSDB_DATA_TYPE_SMALLINT:
          pstr += sprintf(pstr, "%d", (int)(*((short *)row[col])));
          break;
        case TSDB_DATA_TYPE_INT:
          pstr += sprintf(pstr, "%d", *((int *)row[col]));
          break;
        case TSDB_DATA_TYPE_BIGINT:
          pstr += sprintf(pstr, "%" PRId64, *((int64_t *)row[col]));
          break;
        case TSDB_DATA_TYPE_FLOAT:
          pstr += sprintf(pstr, "%f", GET_FLOAT_VAL(row[col]));
          break;
        case TSDB_DATA_TYPE_DOUBLE:
          pstr += sprintf(pstr, "%f", GET_DOUBLE_VAL(row[col]));
          break;
        case TSDB_DATA_TYPE_BINARY:
          *(pstr++) = '\'';
          converStringToReadable((char *)row[col], fields[col].bytes, tbuf, COMMAND_SIZE);
          pstr = stpcpy(pstr, tbuf);
          *(pstr++) = '\'';
          break;
        case TSDB_DATA_TYPE_NCHAR:
          convertNCharToReadable((char *)row[col], fields[col].bytes, tbuf, COMMAND_SIZE);
          pstr += sprintf(pstr, "\'%s\'", tbuf);
          break;
        case TSDB_DATA_TYPE_TIMESTAMP:
          pstr += sprintf(pstr, "%" PRId64, *(int64_t *)row[col]);
          break;
        default:
          break;
      }
    }
    sprintf(pstr, ")");

    count++;
    fprintf(fp, "%s", buffer);

    if (count >= arguments->data_batch) {
      fprintf(fp, "\n");
      count = 0;
    } else {
      fprintf(fp, "\\\n");
    }
  }

  fprintf(fp, "\n");

  if (tbuf) free(tbuf);
  taos_free_result(result);
  result = NULL;
  return 0;
}

int taosCheckParam(SDumpArguments *arguments) {
  if (arguments->all_databases && arguments->databases) {
    fprintf(stderr, "conflict option --all-databases and --databases\n");
    return -1;
  }

  if (arguments->start_time > arguments->end_time) {
    fprintf(stderr, "start time is larger than end time\n");
    return -1;
  }
  if (arguments->arg_list_len == 0) {
    if ((!arguments->all_databases) && (!arguments->isDumpIn)) {
      fprintf(stderr, "taosdump requires parameters\n");
      return -1;
    }
  }

  if (arguments->isDumpIn && (strcmp(arguments->output, DEFAULT_DUMP_FILE) != 0)) {
    fprintf(stderr, "duplicate parameter input and output file\n");
    return -1;
  }

  if (!arguments->isDumpIn && arguments->encode != NULL) {
    fprintf(stderr, "invalid option in dump out\n");
    return -1;
  }

  return 0;
}

bool isEmptyCommand(char *cmd) {
  char *pchar = cmd;

  while (*pchar != '\0') {
    if (*pchar != ' ') return false;
    pchar++;
  }

  return true;
}

void taosReplaceCtrlChar(char *str) {
  _Bool ctrlOn = false;
  char *pstr = NULL;

  for (pstr = str; *str != '\0'; ++str) {
    if (ctrlOn) {
      switch (*str) {
        case 'n':
          *pstr = '\n';
          pstr++;
          break;
        case 'r':
          *pstr = '\r';
          pstr++;
          break;
        case 't':
          *pstr = '\t';
          pstr++;
          break;
        case '\\':
          *pstr = '\\';
          pstr++;
          break;
        case '\'':
          *pstr = '\'';
          pstr++;
          break;
        default:
          break;
      }
      ctrlOn = false;
    } else {
      if (*str == '\\') {
        ctrlOn = true;
      } else {
        *pstr = *str;
        pstr++;
      }
    }
  }

  *pstr = '\0';
}

int taosDumpIn(SDumpArguments *arguments) {
  assert(arguments->isDumpIn);

  int     tsize = 0;
  FILE *  fp = NULL;
  char *  line = NULL;
  _Bool   isRun = true;
  size_t  line_size = 0;
  char *  pstr = NULL, *lstr = NULL;
  iconv_t cd = (iconv_t)-1;
  size_t  inbytesleft = 0;
  size_t  outbytesleft = COMMAND_SIZE;
  char    fcharset[64];
  char *  tcommand = NULL;

  fp = fopen(arguments->input, "r");
  if (fp == NULL) {
    fprintf(stderr, "failed to open input file %s\n", arguments->input);
    return -1;
  }

  taosLoadFileCharset(fp, fcharset);

  taos = taos_connect(arguments->host, arguments->user, arguments->password, NULL, arguments->port);
  if (taos == NULL) {
    fprintf(stderr, "failed to connect to TDengine server\n");
    goto _dumpin_exit_failure;
  }

  command = (char *)malloc(COMMAND_SIZE);
  lcommand = (char *)malloc(COMMAND_SIZE);
  if (command == NULL || lcommand == NULL) {
    fprintf(stderr, "failed to connect to allocate memory\n");
    goto _dumpin_exit_failure;
  }

  // Resolve locale
  if (*fcharset != '\0') {
    arguments->encode = fcharset;
  }

  if (arguments->encode != NULL && strcasecmp(tsCharset, arguments->encode) != 0) {
    cd = iconv_open(tsCharset, arguments->encode);
    if (cd == (iconv_t)-1) {
      fprintf(stderr, "Failed to open iconv handle\n");
      goto _dumpin_exit_failure;
    }
  }

  pstr = command;
  int64_t linenu = 0;
  while (1) {
    ssize_t size = getline(&line, &line_size, fp);
    linenu++;
    if (size <= 0) break;
    if (size == 1) {
      if (pstr != command) {
        inbytesleft = pstr - command;
        memset(lcommand, 0, COMMAND_SIZE);
        pstr = command;
        lstr = lcommand;
        outbytesleft = COMMAND_SIZE;
        if (cd != (iconv_t)-1) {
          iconv(cd, &pstr, &inbytesleft, &lstr, &outbytesleft);
          tcommand = lcommand;
        } else {
          tcommand = command;
        }
        taosReplaceCtrlChar(tcommand);

        TAOS_RES* result = taos_query(taos, tcommand);
        if (taos_errno(result) != 0){
          fprintf(stderr, "linenu: %" PRId64 " failed to run command %s reason:%s \ncontinue...\n", linenu, command,
                  taos_errstr(result));
          taos_free_result(result);
        }

        pstr = command;
        pstr[0] = '\0';
        tsize = 0;
        isRun = true;
      }

      continue;
    }

    /* if (line[0] == '-' && line[1] == '-') continue; */

    line[size - 1] = 0;

    if (tsize + size - 1 > COMMAND_SIZE) {
      fprintf(stderr, "command is too long\n");
      goto _dumpin_exit_failure;
    }

    if (line[size - 2] == '\\') {
      line[size - 2] = ' ';
      isRun = false;
    } else {
      isRun = true;
    }

    memcpy(pstr, line, size - 1);
    pstr += (size - 1);
    *pstr = '\0';

    if (!isRun) continue;

    if (command != pstr && !isEmptyCommand(command)) {
      inbytesleft = pstr - command;
      memset(lcommand, 0, COMMAND_SIZE);
      pstr = command;
      lstr = lcommand;
      outbytesleft = COMMAND_SIZE;
      if (cd != (iconv_t)-1) {
        iconv(cd, &pstr, &inbytesleft, &lstr, &outbytesleft);
        tcommand = lcommand;
      } else {
        tcommand = command;
      }
      taosReplaceCtrlChar(tcommand);
      TAOS_RES* result = taos_query(taos, tcommand);
      int32_t code = taos_errno(result);
      if (code != 0) 
      {
        fprintf(stderr, "linenu:%" PRId64 " failed to run command %s reason: %s \ncontinue...\n", linenu, command,
                taos_errstr(result));
      }
      taos_free_result(result);
    }

    pstr = command;
    *pstr = '\0';
    tsize = 0;
  }

  if (pstr != command) {
    inbytesleft = pstr - command;
    memset(lcommand, 0, COMMAND_SIZE);
    pstr = command;
    lstr = lcommand;
    outbytesleft = COMMAND_SIZE;
    if (cd != (iconv_t)-1) {
      iconv(cd, &pstr, &inbytesleft, &lstr, &outbytesleft);
      tcommand = lcommand;
    } else {
      tcommand = command;
    }
    taosReplaceCtrlChar(lcommand);
    if (taos_query(taos, tcommand) == NULL)
      fprintf(stderr, "linenu:%" PRId64 " failed to run command %s reason:%s \ncontinue...\n", linenu, command,
              taos_errstr(taos));
  }

  if (cd != (iconv_t)-1) iconv_close(cd);
  tfree(line);
  tfree(command);
  tfree(lcommand);
  taos_close(taos);
  fclose(fp);
  return 0;

_dumpin_exit_failure:
  if (cd != (iconv_t)-1) iconv_close(cd);
  tfree(command);
  tfree(lcommand);
  taos_close(taos);
  fclose(fp);
  return -1;
}

char *ascii_literal_list[] = {
    "\\x00", "\\x01", "\\x02", "\\x03", "\\x04", "\\x05", "\\x06", "\\x07", "\\x08", "\\t",   "\\n",   "\\x0b", "\\x0c",
    "\\r",   "\\x0e", "\\x0f", "\\x10", "\\x11", "\\x12", "\\x13", "\\x14", "\\x15", "\\x16", "\\x17", "\\x18", "\\x19",
    "\\x1a", "\\x1b", "\\x1c", "\\x1d", "\\x1e", "\\x1f", " ",     "!",     "\\\"",  "#",     "$",     "%",     "&",
    "\\'",   "(",     ")",     "*",     "+",     ",",     "-",     ".",     "/",     "0",     "1",     "2",     "3",
    "4",     "5",     "6",     "7",     "8",     "9",     ":",     ";",     "<",     "=",     ">",     "?",     "@",
    "A",     "B",     "C",     "D",     "E",     "F",     "G",     "H",     "I",     "J",     "K",     "L",     "M",
    "N",     "O",     "P",     "Q",     "R",     "S",     "T",     "U",     "V",     "W",     "X",     "Y",     "Z",
    "[",     "\\\\",  "]",     "^",     "_",     "`",     "a",     "b",     "c",     "d",     "e",     "f",     "g",
    "h",     "i",     "j",     "k",     "l",     "m",     "n",     "o",     "p",     "q",     "r",     "s",     "t",
    "u",     "v",     "w",     "x",     "y",     "z",     "{",     "|",     "}",     "~",     "\\x7f", "\\x80", "\\x81",
    "\\x82", "\\x83", "\\x84", "\\x85", "\\x86", "\\x87", "\\x88", "\\x89", "\\x8a", "\\x8b", "\\x8c", "\\x8d", "\\x8e",
    "\\x8f", "\\x90", "\\x91", "\\x92", "\\x93", "\\x94", "\\x95", "\\x96", "\\x97", "\\x98", "\\x99", "\\x9a", "\\x9b",
    "\\x9c", "\\x9d", "\\x9e", "\\x9f", "\\xa0", "\\xa1", "\\xa2", "\\xa3", "\\xa4", "\\xa5", "\\xa6", "\\xa7", "\\xa8",
    "\\xa9", "\\xaa", "\\xab", "\\xac", "\\xad", "\\xae", "\\xaf", "\\xb0", "\\xb1", "\\xb2", "\\xb3", "\\xb4", "\\xb5",
    "\\xb6", "\\xb7", "\\xb8", "\\xb9", "\\xba", "\\xbb", "\\xbc", "\\xbd", "\\xbe", "\\xbf", "\\xc0", "\\xc1", "\\xc2",
    "\\xc3", "\\xc4", "\\xc5", "\\xc6", "\\xc7", "\\xc8", "\\xc9", "\\xca", "\\xcb", "\\xcc", "\\xcd", "\\xce", "\\xcf",
    "\\xd0", "\\xd1", "\\xd2", "\\xd3", "\\xd4", "\\xd5", "\\xd6", "\\xd7", "\\xd8", "\\xd9", "\\xda", "\\xdb", "\\xdc",
    "\\xdd", "\\xde", "\\xdf", "\\xe0", "\\xe1", "\\xe2", "\\xe3", "\\xe4", "\\xe5", "\\xe6", "\\xe7", "\\xe8", "\\xe9",
    "\\xea", "\\xeb", "\\xec", "\\xed", "\\xee", "\\xef", "\\xf0", "\\xf1", "\\xf2", "\\xf3", "\\xf4", "\\xf5", "\\xf6",
    "\\xf7", "\\xf8", "\\xf9", "\\xfa", "\\xfb", "\\xfc", "\\xfd", "\\xfe", "\\xff"};

int converStringToReadable(char *str, int size, char *buf, int bufsize) {
  char *pstr = str;
  char *pbuf = buf;
  while (size > 0) {
    if (*pstr == '\0') break;
    pbuf = stpcpy(pbuf, ascii_literal_list[((uint8_t)(*pstr))]);
    pstr++;
    size--;
  }
  *pbuf = '\0';
  return 0;
}

int convertNCharToReadable(char *str, int size, char *buf, int bufsize) {
  char *pstr = str;
  char *pbuf = buf;
  // TODO
  wchar_t wc;
  while (size > 0) {
    if (*pstr == '\0') break;
    int byte_width = mbtowc(&wc, pstr, MB_CUR_MAX);

    if ((int)wc < 256) {
      pbuf = stpcpy(pbuf, ascii_literal_list[(int)wc]);
    } else if (byte_width > 0) {
      memcpy(pbuf, pstr, byte_width);
      pbuf += byte_width;
    }
    pstr += byte_width;
  }

  *pbuf = '\0';

  return 0;
}

void taosDumpCharset(FILE *fp) {
  char charsetline[256];

  fseek(fp, 0, SEEK_SET);
  sprintf(charsetline, "#!%s\n", tsCharset);
  fwrite(charsetline, strlen(charsetline), 1, fp);
}

void taosLoadFileCharset(FILE *fp, char *fcharset) {
  char * line = NULL;
  size_t line_size = 0;

  fseek(fp, 0, SEEK_SET);
  ssize_t size = getline(&line, &line_size, fp);
  if (size <= 2) {
    goto _exit_no_charset;
  }

  if (strncmp(line, "#!", 2) != 0) {
    goto _exit_no_charset;
  }
  if (line[size - 1] == '\n') {
    line[size - 1] = '\0';
    size--;
  }
  strcpy(fcharset, line + 2);

  tfree(line);
  return;

_exit_no_charset:
  fseek(fp, 0, SEEK_SET);
  *fcharset = '\0';
  tfree(line);
  return;
}