text: /*
   * Copyright (c) Huawei Technologies Co., Ltd. 2014-2021. All rights reserved.
   * Licensed under Mulan PSL v2.
   * You can use this software according to the terms and conditions of the Mulan PSL v2.
   * You may obtain a copy of Mulan PSL v2 at:
   *          http://license.coscl.org.cn/MulanPSL2
   * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
   * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
   * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
   * See the Mulan PSL v2 for more details.
   * Description: vsnprintf_s  function
   * Create: 2014-02-25
   */
  
  #include "secureprintoutput.h"
  
  #if SECUREC_ENABLE_VSNPRINTF
  /*
   * <FUNCTION DESCRIPTION>
   *    The vsnprintf_s function is equivalent to the vsnprintf function
   *     except for the parameter destMax/count and the explicit runtime-constraints violation
   *    The vsnprintf_s function takes a pointer to an argument list, then formats
   *    and writes up to count characters of the given data to the memory pointed
   *    to by strDest and appends a terminating null.
   *
   * <INPUT PARAMETERS>
   *    strDest                  Storage location for the output.
   *    destMax                The size of the strDest for output.
   *    count                    Maximum number of character to write(not including
   *                                the terminating NULL)
   *    format                   Format-control string.
   *    argList                     pointer to list of arguments.
   *
   * <OUTPUT PARAMETERS>
   *    strDest                is updated
   *
   * <RETURN VALUE>
   *    return  the number of characters written, not including the terminating null
   *    return -1 if an  error occurs.
   *    return -1 if count < destMax and the output string  has been truncated
   *
   * If there is a runtime-constraint violation, strDest[0] will be set to the '\0' when strDest and destMax valid
   */
  int vsnprintf_s(char *strDest, size_t destMax, size_t count, const char *format, va_list argList)
  {
      int retVal;
  
      if (SECUREC_VSNPRINTF_PARAM_ERROR(format, strDest, destMax, count, SECUREC_STRING_MAX_LEN)) {
          SECUREC_VSPRINTF_CLEAR_DEST(strDest, destMax, SECUREC_STRING_MAX_LEN);
          SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_s");
          return -1;
      }
  
      if (destMax > count) {
          retVal = SecVsnprintfImpl(strDest, count + 1, format, argList);
          if (retVal == SECUREC_PRINTF_TRUNCATE) {  /* To keep dest buffer not destroyed 2014.2.18 */
              /* The string has been truncated, return  -1 */
              return -1;          /* To skip error handler,  return strlen(strDest) or -1 */
          }
      } else {
          retVal = SecVsnprintfImpl(strDest, destMax, format, argList);
  #ifdef SECUREC_COMPATIBLE_WIN_FORMAT
          if (retVal == SECUREC_PRINTF_TRUNCATE && count == (size_t)(-1)) {
              return -1;
          }
  #endif
      }
  
      if (retVal < 0) {
          strDest[0] = '\0';      /* Empty the dest strDest */
          if (retVal == SECUREC_PRINTF_TRUNCATE) {
              /* Buffer too small */
              SECUREC_ERROR_INVALID_RANGE("vsnprintf_s");
          }
          SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_s");
          return -1;
      }
  
      return retVal;
  }
  #if SECUREC_EXPORT_KERNEL_SYMBOL
  EXPORT_SYMBOL(vsnprintf_s);
  #endif
  #endif
  
  #if SECUREC_SNPRINTF_TRUNCATED
  /*
   * <FUNCTION DESCRIPTION>
   *    The vsnprintf_truncated_s function is equivalent to the vsnprintf function
   *     except for the parameter destMax/count and the explicit runtime-constraints violation
   *    The vsnprintf_truncated_s function takes a pointer to an argument list, then formats
   *    and writes up to count characters of the given data to the memory pointed
   *    to by strDest and appends a terminating null.
   *
   * <INPUT PARAMETERS>
   *    strDest                  Storage location for the output.
   *    destMax                The size of the strDest for output.
   *                                the terminating NULL)
   *    format                   Format-control string.
   *    argList                     pointer to list of arguments.
   *
   * <OUTPUT PARAMETERS>
   *    strDest                is updated
   *
   * <RETURN VALUE>
   *    return  the number of characters written, not including the terminating null
   *    return -1 if an  error occurs.
   *    return destMax-1 if output string  has been truncated
   *
   * If there is a runtime-constraint violation, strDest[0] will be set to the '\0' when strDest and destMax valid
   */
  int vsnprintf_truncated_s(char *strDest, size_t destMax, const char *format, va_list argList)
  {
      int retVal;
  
      if (SECUREC_VSPRINTF_PARAM_ERROR(format, strDest, destMax, SECUREC_STRING_MAX_LEN)) {
          SECUREC_VSPRINTF_CLEAR_DEST(strDest, destMax, SECUREC_STRING_MAX_LEN);
          SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_truncated_s");
          return -1;
      }
  
      retVal = SecVsnprintfImpl(strDest, destMax, format, argList);
      if (retVal < 0) {
          if (retVal == SECUREC_PRINTF_TRUNCATE) {
              return (int)(destMax - 1);  /* To skip error handler,  return strlen(strDest) */
          }
          strDest[0] = '\0';      /* Empty the dest strDest */
          SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_truncated_s");
          return -1;
      }
  
      return retVal;
  }
  #if SECUREC_EXPORT_KERNEL_SYMBOL
  EXPORT_SYMBOL(vsnprintf_truncated_s);
  #endif
  #endif
  
  