system/bta/sys/utl.cc

/******************************************************************************
 *
 *  Copyright 2003-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This file contains utility functions.
 *
 ******************************************************************************/
#include "bta/include/utl.h"

#include <cstdint>

#include "internal_include/bt_target.h"
#include "stack/include/btm_api.h"

/*******************************************************************************
 *
 * Function         utl_str2int
 *
 * Description      This utility function converts a character string to an
 *                  integer.  Acceptable values in string are 0-9.  If invalid
 *                  string or string value too large, -1 is returned.  Leading
 *                  spaces are skipped.
 *
 *
 * Returns          Integer value or -1 on error.
 *
 ******************************************************************************/
int16_t utl_str2int(const char* p_s) {
  int32_t val = 0;

  for (; *p_s == ' ' && *p_s != 0; p_s++)
    ;

  if (*p_s == 0) return -1;

  for (;;) {
    if ((*p_s < '0') || (*p_s > '9')) return -1;

    val += (int32_t)(*p_s++ - '0');

    if (val > 32767) return -1;

    if (*p_s == 0) {
      return (int16_t)val;
    } else {
      val *= 10;
    }
  }
}

/*******************************************************************************
 *
 * Function         utl_strucmp
 *
 * Description      This utility function compares two strings in uppercase.
 *                  String p_s must be uppercase.  String p_t is converted to
 *                  uppercase if lowercase.  If p_s ends first, the substring
 *                  match is counted as a match.
 *
 *
 * Returns          0 if strings match, nonzero otherwise.
 *
 ******************************************************************************/
int utl_strucmp(const char* p_s, const char* p_t) {
  char c;

  while (*p_s && *p_t) {
    c = *p_t++;
    if (c >= 'a' && c <= 'z') {
      c -= 0x20;
    }
    if (*p_s++ != c) {
      return -1;
    }
  }
  /* if p_t hit null first, no match */
  if (*p_t == 0 && *p_s != 0) {
    return 1;
  }
  /* else p_s hit null first, count as match */
  else {
    return 0;
  }
}

/*******************************************************************************
 *
 * Function         utl_itoa
 *
 * Description      This utility function converts a uint16_t to a string.  The
 *                  string is NULL-terminated.  The length of the string is
 *                  returned;
 *
 *
 * Returns          Length of string.
 *
 ******************************************************************************/
uint8_t utl_itoa(uint16_t i, char* p_s) {
  uint16_t j, k;
  char* p = p_s;
  bool fill = false;

  if (i == 0) {
    /* take care of zero case */
    *p++ = '0';
  } else {
    for (j = 10000; j > 0; j /= 10) {
      k = i / j;
      i %= j;
      if (k > 0 || fill) {
        *p++ = k + '0';
        fill = true;
      }
    }
  }
  *p = 0;
  return (uint8_t)(p - p_s);
}

/*******************************************************************************
 *
 * Function         utl_set_device_class
 *
 * Description      This function updates the local Device Class.
 *
 * Parameters:
 *                  p_cod   - Pointer to the device class to set to
 *
 *                  cmd     - the fields of the device class to update.
 *                            BTA_UTL_SET_COD_MAJOR_MINOR, - overwrite major,
 *                                                           minor class
 *                            BTA_UTL_SET_COD_SERVICE_CLASS - set the bits in
 *                                                            the input
 *                            BTA_UTL_CLR_COD_SERVICE_CLASS - clear the bits in
 *                                                            the input
 *                            BTA_UTL_SET_COD_ALL - overwrite major, minor, set
 *                                                  the bits in service class
 *                            BTA_UTL_INIT_COD - overwrite major, minor, and
 *                                               service class
 *
 * Returns          true if successful, Otherwise false
 *
 ******************************************************************************/
bool utl_set_device_class(tBTA_UTL_COD* p_cod, uint8_t cmd) {
  uint16_t service;
  uint8_t minor, major;
  DEV_CLASS old_class;

  old_class = BTM_ReadDeviceClass();
  BTM_COD_SERVICE_CLASS(service, old_class);
  BTM_COD_MINOR_CLASS(minor, old_class);
  BTM_COD_MAJOR_CLASS(major, old_class);

  switch (cmd) {
    case BTA_UTL_SET_COD_MAJOR_MINOR:
      minor = p_cod->minor & BTM_COD_MINOR_CLASS_MASK;
      major = p_cod->major & BTM_COD_MAJOR_CLASS_MASK;
      break;

    case BTA_UTL_SET_COD_SERVICE_CLASS:
      /* clear out the bits that is not SERVICE_CLASS bits */
      p_cod->service &= BTM_COD_SERVICE_CLASS_MASK;
      service = service | p_cod->service;
      break;

    case BTA_UTL_CLR_COD_SERVICE_CLASS:
      p_cod->service &= BTM_COD_SERVICE_CLASS_MASK;
      service = service & (~p_cod->service);
      break;

    case BTA_UTL_SET_COD_ALL:
      minor = p_cod->minor & BTM_COD_MINOR_CLASS_MASK;
      major = p_cod->major & BTM_COD_MAJOR_CLASS_MASK;
      p_cod->service &= BTM_COD_SERVICE_CLASS_MASK;
      service = service | p_cod->service;
      break;

    case BTA_UTL_INIT_COD:
      minor = p_cod->minor & BTM_COD_MINOR_CLASS_MASK;
      major = p_cod->major & BTM_COD_MAJOR_CLASS_MASK;
      service = p_cod->service & BTM_COD_SERVICE_CLASS_MASK;
      break;

    default:
      return false;
  }

  /* convert the fields into the device class type */
  DEV_CLASS dev_class;
  FIELDS_TO_COD(dev_class, minor, major, service);

  if (BTM_SetDeviceClass(dev_class) == BTM_SUCCESS) return true;

  return false;
}

/*******************************************************************************
 *
 * Function         utl_isintstr
 *
 * Description      This utility function checks if the given string is an
 *                  integer string or not
 *
 *
 * Returns          true if successful, Otherwise false
 *
 ******************************************************************************/
bool utl_isintstr(const char* p_s) {
  uint16_t i = 0;

  for (i = 0; p_s[i] != 0; i++) {
    if (((p_s[i] < '0') || (p_s[i] > '9')) && (p_s[i] != ';')) return false;
  }

  return true;
}

/*******************************************************************************
 *
 * Function         utl_isdialchar
 *
 * Description      This utility function checks if the given character
 *                  is an acceptable dial digit
 *
 * Returns          true if successful, Otherwise false
 *
 ******************************************************************************/
bool utl_isdialchar(const char d) {
  return (((d >= '0') && (d <= '9')) || (d == '*') || (d == '+') ||
          (d == '#') || (d == ';') || (d == ',') ||
          ((d >= 'A') && (d <= 'C')) ||
          ((d == 'p') || (d == 'P') || (d == 'w') || (d == 'W')));
}

/*******************************************************************************
 *
 * Function         utl_isdialstr
 *
 * Description      This utility function checks if the given string contains
 *                  only dial digits or not
 *
 *
 * Returns          true if successful, Otherwise false
 *
 ******************************************************************************/
bool utl_isdialstr(const char* p_s) {
  for (uint16_t i = 0; p_s[i] != 0; i++) {
    // include chars not in spec that work sent by some headsets.
    if (!(utl_isdialchar(p_s[i]) || (p_s[i] == '-'))) return false;
  }
  return true;
}