Re: [Dev-C++] FILE positionning problem.

[Per W. <pw...@ia...>]

First of all - notice that EOF is (-1) while fgetc() returns a unsigned
char cast as an int.

A valid char will then be an integer 0..255, while EOF is -1.

You don't assign to an int but to a char. Then you will not be able to see
the difference between a valid char and the EOF, since (char)-1 is a valid
character.

There is no need to do ftell()/fseek(). fgetc() does work!

int ch;
FILE *Fcarte;

Fcarte =3D foepn(carte,"rt"); /* "rt" for text stream to handle \r\n */
if (Fcarte =3D=3D NULL) {
    printf("Failed open file\n");
    return;
}
for (;;) {
    ch =3D fgetc(Fcarte);
    if (ch =3D=3D EOF) break;
    printf("I just found the caracter %c (%02x)\n",
        /* all characters not printable on all terminals, so just try to
         * print 32 .. 127
         */
        (ch >=3D ' ' && ch <=3D 127) ? ch : '.',
        ch);
}
fclose(Fcarte);


On Mon, 7 Jul 2003, Provic wrote:

> See at the bottom...
>
> Per Westermark wrote:
>
> >Why - aren't we supposted to be clairvoyant and simply "see" the problem
> >before us in the air :-)
> >
> >/Per W
> >
> >On Mon, 7 Jul 2003, Ioannis Vranos wrote:
> >
> >
> >
> >>>-----Original Message-----
> >>>From: dev...@li...
> >>>[mailto:dev...@li...] On Behalf Of Provic
> >>>Sent: Monday, July 07, 2003 11:59 AM
> >>>To: dev...@li...
> >>>Subject: [Dev-C++] FILE positionning problem.
> >>>
> >>>
> >>>Hi !
> >>>My current problem is a little weird : I read in the man-pages that
> >>>fgetc increases automatically the position in a current opened file.
> >>>So my program reads each character of this file in a while :
> >>>it should
> >>>do that, but in fact it doesn't.
> >>>I resolved that by repositionning each time by fseek (param :
> >>>SEEK_SET)
> >>>at the right position ; but a file access monitoring daemon showed me
> >>>that my program isn't optimised at all, it performs 2 fseek which are
> >>>exactly the sames...
> >>>Where is the bug ?
> >>>I verified my code, no need to include it : no pb here.
> >>>
> >>>
> >>I think you had better post your code. :)
> >>
> >>
> >>
> >>
> So that is my code (no comments, they were in french)
>
> void func()
> {
>    FILE *Fcarte;
>    long int pos;       //   Position
>    char Charou;      //   The character, converted in char
>    int ICharou;      //      The original character
>
>    Fcarte=3Dfopen(carte, "r");
>    if (Fcarte=3D=3DNULL)
>    {
>        printf("Impossible d'ouvrir de fichier bsp.\n");
>        return;
>    }
>
> while(1)
>        {
>        pos =3D ftell(Fcarte);                               //
> _________________Nb 1
>        ICharou=3Dfgetc(Fcarte);
>            /*         if (ICharou=3D=3DEOF)               // Here were th=
ere
> an EOF test : I removed it, it did bug a lot (?)
>                        break;            */
>
>        Charou=3D(char) ICharou;
>                                                                   /*
> [stuff, using Charou...] */
>
>        fseek(Fcarte, pos+1, SEEK_SET);        //      _________________Nb=
 2
>       }
>
> }
>
> before adding Nb1 and Nb2, it worked too buggly (?). thereafter, it
> works too slowly (normal).
>
> Hoping you will help, Thankssssss
>
> Herv=E9
>
>
>
>
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