[sdcc-devel] [ sdcc-Bugs-1458678 ] unsigned long *const w, xtea stream cypher

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Bugs item #1458678, was opened at 2006-03-26 11:30
Message generated for change (Comment added) made by maartenbrock
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Frieder Ferlemann (frief)
Assigned to: Nobody/Anonymous (nobody)
Summary: unsigned long *const w, xtea stream cypher

Initial Comment:
Hi,
SDCC chokes on the ansi C xtea algorithm as provided
at:
http://www.simonshepherd.supanet.com/source.htm#new_ansi

void encipher(const unsigned long *const v,unsigned
long *const w,
   const unsigned long * const k)
{
   register unsigned long      
y=v[0],z=v[1],sum=0,delta=0x9E3779B9,n=32;

   while(n-->0)
      {
      y += (z << 4 ^ z >> 5) + z ^ sum + k[sum&3];
      sum += delta;
      z += (y << 4 ^ y >> 5) + y ^ sum + k[sum>>11 & 3];
      }

   w[0]=y; w[1]=z;
}



xtea.c:13: error 33: Attempt to assign value to a
constant variable (=)

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>Comment By: Maarten Brock (maartenbrock)
Date: 2006-04-27 11:54

Message:
Logged In: YES 
user_id=888171

Bug 1302048 is related / the same.

----------------------------------------------------------------------

Comment By: Frieder Ferlemann (frief)
Date: 2006-04-26 22:34

Message:
Logged In: YES 
user_id=589052

This is a stripped down example which also exposes the bug:

------8<--------------------------------
/* this gives an error (not OK).
   The keyword "const" seems to
   be attributed to the value pointed to
   instead of to the pointer itself
 */
void should_not_give_error(char * const w)
{
   w[0]='a';
}


/* (OK) */
void does_not_give_error(char * w)
{
   w[0]='a';
}


/* this gives an error (OK) */
void gives_error(const char * w)
{
   w[0]='a';
}


----------------------------------------------------------------------

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