/*
 * @project      The CERN Tape Archive (CTA)
 * @copyright    Copyright © 2003-2022 CERN
 * @license      This program is free software, distributed under the terms of the GNU General Public
 *               Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". You can
 *               redistribute it and/or modify it under the terms of the GPL Version 3, or (at your
 *               option) any later version.
 *
 *               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. See the GNU General Public License for more details.
 *
 *               In applying this licence, CERN does not waive the privileges and immunities
 *               granted to it by virtue of its status as an Intergovernmental Organization or
 *               submit itself to any jurisdiction.
 */

#include <ctype.h>
#include <osdep.h>

/**
 * Checks whether the given string is a size.
 * The accepted syntax is :
 *    [blanks]<digits>[b|k|M|G|T|P]i?
 * @return -1 if it is not a size,
 * 0 if it is a size with no unit,
 * 1 if it is a size with a unit
 */
int check_for_strutou64(char *str) {
  /* We accept only the following format */
  /* [blanks]<digits>[b|k|M|G|T|P]i? */
  char *p = (char *) str;
  while (isspace (*p)) p++; /* skip leading spaces */
  while (*p) {
    if (! isdigit (*p)) break;
    p++;
  }

  /* End of the digits section:  */
  /* Either there is a supported unit, either there is none */
  switch (*p) {
  case '\0':
    return(0); /* Ok and no unit */
  case 'b':  /* Not supported by u64
                we say it is bytes
                u64 will ignore it, simply */
  case 'k':
  case 'M':
  case 'G':
  case 'T':
  case 'P':
    switch (*++p) {
    case '\0':
      return(1); /* Ok with unit */
    case 'i':
      if (*(p+2) == '\0')
        return(1); /* Ok with power of 2 unit */
      else
        return(-1); /* Unit followed by anything, not valid */
    default:
      return(-1); /* Unit followed by anything, not valid */
    }
  default:
    return(-1); /* Unknown unit */
  }
}