Re: [Gcl-devel] 2.6.11 windows

[Camm Maguire]

Greetings, and thanks for your feedback!

Please 'git pull' to commit BROKEN_WINDOWS_SSCANF and see if mingw is
good to go.

Take care,

David Billinghurst <address@hidden> writes:

> On 4/09/2014 11:23 AM, Camm Maguire wrote:
>> Greetings!
>>
>> Could you please try commenting out the following line of o/read.d:
>>
>>      if (n!=1||s[m]) return OBJNULL;
> This works and prints 2.718281828459045 on the setq example
>
>> If this works, then try replacing it with
>>
>>     printf("%s %d %d %lf\n",s,n,m,f);fflush(stdout);
>>
>> recompile, and try your setq example again.  Your C library
>> implementation of sscanf cannot correctly process
>>
>>      n=sscanf(s,"%lf%n",&f,&m);
>>
>> and so far is the only such system that I have found.
>
> The sscanf function stops at character 349, so next character is not
> the null terminating the string.
> As shown, the strtod function works, so this may be an option.
>
> mingw uses the microsoft MSVCRT library for I/O. I have done a search
> and can't find mention of this bug.
>
> Here is a self contained test case.
>
> #include <stdio.h>
> #include <stdlib.h>
>
> int main () {
>   char s[]= "\
> 2.718281828459045235360287471352662497757247093699\
> 95957496696762772407663035354759457138217852516642\
> 74274663919320030599218174135966290435729003342952\
> 60595630738132328627943490763233829880753195251019\
> 01157383418793070215408914993488416750924476146066\
> 80822648001684774118537423454424371075390777449920\
> 69551702761838606261331384583000752044933826560297\
> 60673711320070932870912744374704723069697720931014\
> 16928368190255151086574637721112523897844250569536\
> 96770785449969967946864454905987931636889230098793\
> 12773617821542499922957635148220826989519366803318\
> 25288693984964651058209392398294887933203625094431\
> 173012381970684161404";
>   int n, m;
>   double f;
>   char *endptr;
>
>   n=sscanf(s,"%lf%n",&f,&m);
>   printf("s    = %s\n",s);
>   printf("n    = %d\n",n);
>   printf("m    = %d\n",m);
>   printf("f    = %lf\n",f);
>   printf("s[m-2]:s[m] = %c%c%c\n",s[m-2],s[m-1],s[m]);
>
>   /* try strtod
>    *endptr is character that stopped scan */
>   printf("\nWith strtod\n");
>   f = strtod(s,&endptr);
>   printf("f    = %lf\n",f);
>   printf("len  = %d\n",endptr-s);
>   if (! *endptr )
>     printf("Terminating char is null\n");
>   printf("Last char = %c\n",*(endptr-1));
>  }
>
>
> and the output
>
> s    =
> 2.7182818284590452353602874713526624977572470936999595749669676277240766303535475945713821785251664274274663919320030599218174135966290435729003342952605956307381323286279434907632338298807531952510190115738341879307021540891499348841675092447614606680822648001684774118537423454424371075390777449920695517027618386062613313845830007520449338265602976067371132007093287091274437470472306969772093101416928368190255151086574637721112523897844250569536967707854499699679468644549059879316368892300987931277361782154249992295763514822082698951936680331825288693984964651058209392398294887933203625094431173012381970684161404
> n    = 1
> m    = 349
> f    = 2.718282
> s[m-2]:s[m] = 297
>
> With strtod
> f    = 2.718282
> len  = 621
> Terminating char is null
> Last char = 4
>
>
>
>
>
>

-- 
Camm Maguire                                        address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah