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From: K-mart Cashier on 4 Jul 2008 12:10
I just don't spend enough time "tinkering" with *nix. Anyhow when I
read from an unbuffered input and type something in, I get two prompts
after I hit return.

m-net% more tty.c
#include <stdio.h>

int main(void)
{
char c;

return(read(0, &c, 1) == 1) ? (unsigned char)c : EOF;

return 0;
}
m-net% ./tty
c
m-net%
m-net%

Now when I buffer the input, and type something in, I only get one
prompt after I hit return.

m-net% more tty2.c
#include <stdio.h>

int main(void)
{
static char buf[BUFSIZ];
static char *bufp = buf;
static int n = 0;

if(n == 0) {
n = read(0,buf, sizeof buf);
bufp = buf;
}
return (--n >= 0) ? (unsigned char) *bufp++ : EOF;
}
m-net% ./tty2
c h a d
m-net%


Why is this?


Chad
From: Chad on 4 Jul 2008 16:18
On Jul 4, 9:10 am, K-mart Cashier <cdal...(a)gmail.com> wrote:
> I just don't spend enough time "tinkering" with *nix. Anyhow when I
> read from an unbuffered input and type something in, I get two prompts
> after I hit return.
>
> m-net% more tty.c
> #include <stdio.h>
>
> int main(void)
> {
>  char c;
>
>  return(read(0, &c, 1) == 1) ? (unsigned char)c : EOF;
>
>  return 0;}
>
> m-net% ./tty
> c
> m-net%
> m-net%
>
> Now when I buffer the input, and type something in, I only get one
> prompt after I hit return.
>
> m-net% more tty2.c
> #include <stdio.h>
>
> int main(void)
> {
>  static char buf[BUFSIZ];
>  static char *bufp = buf;
>  static int n = 0;
>
>  if(n == 0) {
>   n = read(0,buf, sizeof buf);
>   bufp = buf;
>  }
>  return (--n >= 0) ? (unsigned char) *bufp++ : EOF;}
>
> m-net% ./tty2
> c h a d
> m-net%
>
> Why is this?
>
> Chad

Never mind. I thought about it and realized that in the latter,
newline is stored in buf..
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