Reading Ctrl D in fgets with some inputs

[CashCow01]

Hi to all,

I was wondering if you guys can help me with this tricky stdin problem?

Suppose I want my c program to accept input. But at the same time I want to detect Ctrl D as well.

For example,

Your input: test123^D

^D is shown when I press the combination keys Ctrl D.

How do I detect Ctrl D if there are characters before it? For the record, I am able to detect Ctrl D by itself.

Your input: ^D<Press Enter>

Thanks.

[claudiu]

As far as I know CTRL+D is actually EOF. So test for EOF.

[claudiu]

It's always 4.

check out this useful link:

Ascii control codes (control characters, C0 controls)

[magestrium]

K always 4 then, how about a solution??

[vart]

you haven't asked and OP haven't said if it is Windows or Unix

you do not check return value of scanf...
you do not guard against buffer overrun in scanf
and void main - read FAQ why you should not use it

[claudiu]

Magestrium it is against forum rules to provide someone with the entire solution tp his problem before he even got to start working on it. So please don't lecture me. Besides, your solution is poor mainly due to reasons pointed above by vart. It is also against forum rules to post chunks of code REPEATEDLY without using code tags.

Nobody will read them mate.

[CashCow01]

you haven't asked and OP haven't said if it is Windows or Unix

you do not check return value of scanf...
you do not guard against buffer overrun in scanf
and void main - read FAQ why you should not use it

Hi Vart, I am using Unix.

Here are portions of my code:

void* scan(char* buffer)
{
        return fgets(buffer, MAX_BUFFER_SIZE, stdin);
}

void dump_scanf(FILE* fp)
{
        int ch;
        while( (ch = fgetc(fp)) != EOF && ch != '\n' );
}

                int x,y;
                char extra;
                char* buffer = (char *)malloc(sizeof(char)*MAX_BUFFER_SIZE);

                printf("Your input: ");
                void* scan_ptr = scan(buffer);
                if(scan_ptr)
                {
                        r = sscanf(buffer, "%d %d%c", &x, &y, &extra);

                        printf("feof(stdin)=%d\n", feof(stdin));
                        if(strlen(buffer) > 6)
                        {
                                dump_scanf(stdin);
                        }
                }

Your input: 2 2^D
feof(stdin)=0

^D is shown when I press the combination keys Ctrl+D. How do I read that?

[vart]

feof flag will be set after the read failed...

so something like this should be used

while(fgets( buffer, sizeof buffer, stdin))
{
 /* process buffer */
}

if(feof(stdin))
{
   puts("EOF detected\n");
}