Fix for winedbg; disassemble range was flawed

[Jeremy White]

This updated version prevents an infinite loop in the
(currently impossible) case of a poorly specified
disassembly range.  Truth is, this functions interface
is a bit awkward.

Jeremy White wrote:
> Changelog:
>   Properly respect a disassemble x,y command
>   (prior behavior would do y-x instructions, no matter
>    how wide each instruction was)
> 
> 
> ------------------------------------------------------------------------
> 
> Index: programs/winedbg/debugger.h
> ===================================================================
> RCS file: /cvstrees/crossover/office/wine/programs/winedbg/debugger.h,v
> retrieving revision 1.17
> diff -u -r1.17 debugger.h
> --- programs/winedbg/debugger.h	28 Nov 2004 16:23:50 -0000	1.17
> +++ programs/winedbg/debugger.h	5 Dec 2004 04:30:24 -0000
> @@ -317,7 +317,7 @@
>  extern BOOL             memory_get_current_frame(ADDRESS* address);
>  extern BOOL             memory_get_string(HANDLE hp, void* addr, BOOL in_debuggee, BOOL unicode, char* buffer, int size);
>  extern BOOL             memory_get_string_indirect(HANDLE hp, void* addr, BOOL unicode, char* buffer, int size);
> -extern void             memory_disassemble(const struct dbg_lvalue*, const struct dbg_lvalue*, int offset);
> +extern void             memory_disassemble(const struct dbg_lvalue*, const struct dbg_lvalue*, int instruction_count);
>  extern BOOL             memory_disasm_one_insn(ADDRESS* addr);
>  extern void             print_bare_address(const ADDRESS* addr);
>  extern void             print_address(const ADDRESS* addr, BOOLEAN with_line);
> Index: programs/winedbg/memory.c
> ===================================================================
> RCS file: /cvstrees/crossover/office/wine/programs/winedbg/memory.c,v
> retrieving revision 1.1.1.13
> diff -u -r1.1.1.13 memory.c
> --- programs/winedbg/memory.c	28 Nov 2004 15:36:39 -0000	1.1.1.13
> +++ programs/winedbg/memory.c	5 Dec 2004 04:30:24 -0000
> @@ -598,9 +598,11 @@
>  }
>  
>  void memory_disassemble(const struct dbg_lvalue* xstart, 
> -                        const struct dbg_lvalue* xend, int offset)
> +                        const struct dbg_lvalue* xend, int instruction_count)
>  {
>      static ADDRESS last = {0,0,0};
> +    int stop = 0;
> +    int i;
>  
>      if (!xstart && !xend) 
>      {
> @@ -613,7 +615,10 @@
>              last.Mode = AddrModeFlat;
>              last.Offset = types_extract_as_integer(xstart);
>          }
> -        if (xend) offset = types_extract_as_integer(xend) - last.Offset + 1;
> +        if (xend) 
> +            stop = types_extract_as_integer(xend);
>      }
> -    while (offset-- > 0 && memory_disasm_one_insn(&last));
> +    for (i = 0; (instruction_count == 0 || i < instruction_count)  &&
> +                (stop == 0 || last.Offset <= stop); i++)
> +        memory_disasm_one_insn(&last);
>  }

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