/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
 * Description: vfscanf_s  function
 * Author: lishunda
 * Create: 2014-02-25
 */

#define SECUREC_INLINE_INIT_FILE_STREAM_FILE 1
#include "secinput.h"

/*
 * <FUNCTION DESCRIPTION>
 *    The vfscanf_s function is equivalent to fscanf_s, with the variable
 * argument list replaced by argList The vfscanf_s function reads data from the
 * current position of stream into the locations given by argument (if any).
 * Each argument must be a pointer to a variable of a type that corresponds to a
 * type specifier in format. format controls the interpretation of the input
 * fields and has the same form and function as the format argument for scanf.
 *
 * <INPUT PARAMETERS>
 *    stream               Pointer to FILE structure.
 *    format               Format control string, see Format Specifications.
 *    argList              pointer to list of arguments
 *
 * <OUTPUT PARAMETERS>
 *    argList              the converted value stored in user assigned address
 *
 * <RETURN VALUE>
 *    Each of these functions returns the number of fields successfully
 * converted and assigned; the return value does not include fields that were
 * read but not assigned. A return value of 0 indicates that no fields were
 * assigned. return -1 if an error occurs.
 */
int vfscanf_s(FILE *stream, const char *format, va_list argList) {
  int retVal; /* If initialization causes  e838 */
  SecFileStream fStr;

  if (stream == NULL || format == NULL) {
    SECUREC_ERROR_INVALID_PARAMTER("vfscanf_s");
    return SECUREC_SCANF_EINVAL;
  }
  if (stream == SECUREC_STREAM_STDIN) {
    return vscanf_s(format, argList);
  }

  SECUREC_LOCK_FILE(stream);
  SecInitFileStreamFromFile(&fStr, stream);
  retVal = SecInputS(&fStr, format, argList);
  SECUREC_UNLOCK_FILE(stream);
  if (retVal < 0) {
    SECUREC_ERROR_INVALID_PARAMTER("vfscanf_s");
    return SECUREC_SCANF_EINVAL;
  }

  return retVal;
}