src/core/misc.c

   1 /**************************************************************************
   2 MISC Support Routines
   3 **************************************************************************/
   4
   5 FILE_LICENCE ( GPL2_OR_LATER );
   6
   7 #include <stdlib.h>
   8 #include <ctype.h>
   9 #include <byteswap.h>
  10 #include <ipxe/in.h>
  11 #include <ipxe/timer.h>
  12
  13 unsigned int strtoul_charval ( unsigned int charval ) {
  14
  15         if ( charval >= 'a' ) {
  16                 charval = ( charval - 'a' + 10 );
  17         } else if ( charval >= 'A' ) {
  18                 charval = ( charval - 'A' + 10 );
  19         } else if ( charval <= '9' ) {
  20                 charval = ( charval - '0' );
  21         }
  22
  23         return charval;
  24 }
  25
  26 unsigned long strtoul ( const char *p, char **endp, int base ) {
  27         unsigned long ret = 0;
  28         int negative = 0;
  29         unsigned int charval;
  30
  31         while ( isspace ( *p ) )
  32                 p++;
  33
  34         if ( *p == '-' ) {
  35                 negative = 1;
  36                 p++;
  37         }
  38
  39         base = strtoul_base ( &p, base );
  40
  41         while ( 1 ) {
  42                 charval = strtoul_charval ( *p );
  43                 if ( charval >= ( unsigned int ) base )
  44                         break;
  45                 ret = ( ( ret * base ) + charval );
  46                 p++;
  47         }
  48
  49         if ( negative )
  50                 ret = -ret;
  51
  52         if ( endp )
  53                 *endp = ( char * ) p;
  54
  55         return ( ret );
  56 }
  57
  58 /*
  59  * Local variables:
  60  *  c-basic-offset: 8
  61  * End:
  62  */