compat/strtoll.c

   1 /*****************************************************************************
   2  * strtoll.c: C strtoll() replacement
   3  *****************************************************************************
   4  * Copyright © 1998-2010 VLC authors and VideoLAN
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 long long int strtoll( const char *nptr, char **endptr, int base )
  29 {
  30     long long i_value = 0;
  31     int sign = 1, newbase = base ? base : 10;
  32
  33     nptr += strspn( nptr, "\t " );
  34     if( *nptr == '-' )
  35     {
  36         sign = -1;
  37         nptr++;
  38     }
  39
  40     /* Try to detect base */
  41     if( *nptr == '0' )
  42     {
  43         newbase = 8;
  44         nptr++;
  45
  46         if( *nptr == 'x' )
  47         {
  48             newbase = 16;
  49             nptr++;
  50         }
  51     }
  52
  53     if( base && newbase != base )
  54     {
  55         if( endptr ) *endptr = (char *)nptr;
  56         return i_value;
  57     }
  58
  59     switch( newbase )
  60     {
  61         case 10:
  62             while( *nptr >= '0' && *nptr <= '9' )
  63             {
  64                 i_value *= 10;
  65                 i_value += ( *nptr++ - '0' );
  66             }
  67             if( endptr ) *endptr = (char *)nptr;
  68             break;
  69
  70         case 16:
  71             while( (*nptr >= '0' && *nptr <= '9') ||
  72                    (*nptr >= 'a' && *nptr <= 'f') ||
  73                    (*nptr >= 'A' && *nptr <= 'F') )
  74             {
  75                 int i_valc = 0;
  76                 if(*nptr >= '0' && *nptr <= '9') i_valc = *nptr - '0';
  77                 else if(*nptr >= 'a' && *nptr <= 'f') i_valc = *nptr - 'a' +10;
  78                 else if(*nptr >= 'A' && *nptr <= 'F') i_valc = *nptr - 'A' +10;
  79                 i_value *= 16;
  80                 i_value += i_valc;
  81                 nptr++;
  82             }
  83             if( endptr ) *endptr = (char *)nptr;
  84             break;
  85
  86         default:
  87             i_value = strtol( nptr, endptr, newbase );
  88             break;
  89     }
  90
  91     return i_value * sign;
  92 }