src/libs/libunwind/mi/_ReadSLEB.c

   1 #include <libunwind.h>
   2
   3 unw_word_t
   4 _ReadSLEB (unsigned char **dpp)
   5 {
   6   unsigned shift = 0;
   7   unw_word_t byte, result = 0;
   8   unsigned char *bp = *dpp;
   9
  10   while (1)
  11     {
  12       byte = *bp++;
  13       result |= (byte & 0x7f) << shift;
  14       shift += 7;
  15       if ((byte & 0x80) == 0)
  16         break;
  17     }
  18
  19   if (shift < 8 * sizeof (unw_word_t) && (byte & 0x40) != 0)
  20     /* sign-extend negative value */
  21     result |= ((unw_word_t) -1) << shift;
  22
  23   *dpp = bp;
  24   return result;
  25 }