Stopping input with CTRL+D

SirKnightTG · 09-19-2003, 03:39 PM

I'm trying to write a program in linux that will allow me to enter a word then a space then a number. Then after I hit enter it will let me do this again and again. Now I need to be able to stop this so I want it to stop taking input and do some processing when I hit CTRL+D. Something like this:

joe 30
bob 40
jill 20
(CTRL+D pressed)
(now do stuff with the data just entered)

But I can't seem to get it to work without getting a core dump. BTW im writing this in C not C++. Any one know how I can do this? I sorry I don't have the code I have, I left it on another computer that I can't access right now. Thanks for any suggestions. I'm rather new at linux developing.

Kyro · 09-20-2003, 02:00 AM

Ctrl+D == EOF

use getchar to get the characters from input and scan for EOF character.

input is buffered so you can use a while loop with getchar to get a input string.

twm · 09-20-2003, 07:54 AM

Sounds like you need an fgets/sscanf pair and a linked list:

Code:

#include <stdio.h>
#include <stdlib.h>

typedef struct node {
  char name[100];
  int number;
  struct node *next;
} *link;

int main ( ) {
  char buffer[BUFSIZ];
  link list;
  link scratch;

  list = 0;
  while (fgets(buffer, sizeof buffer, stdin) != NULL) {
    if ((scratch = malloc(sizeof *scratch)) == NULL)
      break;
    if (sscanf(buffer, "%s%d", scratch->name, &scratch->number) != 2)
      break;
    scratch->next = list;
    list = scratch;
  }
  for (scratch = list; scratch != NULL; scratch = scratch->next)
    printf("%s -- %d\n", scratch->name, scratch->number);

  return 0;
}

SirKnightTG · 09-20-2003, 11:52 AM

Great, thanks a lot guys! I was able to get this to work using visual C++ in a console app but with linux it seemed different. There were some functions I used before that my linux compiler did not know about so I wasn't sure what to do.

It's been ages since I used C last so I forgot some of the functions. Thanks!

twm · 09-20-2003, 11:58 AM

>There were some functions I used before that my linux compiler did not know about
Sounds like a case of Microsoftitis. Take two of these (ISO/IEC 9899:1999) and call me in the morning. I also recommend a strict regimen of Linux use for the next 50 years. Try to stay off Windows as well, it's bad for your mental health.

09-19-2003, 03:39 PM	#1
SirKnightTG Registered User Join Date: Sep 2003 Posts: 6	Stopping input with CTRL+D I'm trying to write a program in linux that will allow me to enter a word then a space then a number. Then after I hit enter it will let me do this again and again. Now I need to be able to stop this so I want it to stop taking input and do some processing when I hit CTRL+D. Something like this: joe 30 bob 40 jill 20 (CTRL+D pressed) (now do stuff with the data just entered) But I can't seem to get it to work without getting a core dump. BTW im writing this in C not C++. Any one know how I can do this? I sorry I don't have the code I have, I left it on another computer that I can't access right now. Thanks for any suggestions. I'm rather new at linux developing.
SirKnightTG is offline

09-20-2003, 02:00 AM	#2
Kyro Registered User Join Date: Aug 2003 Posts: 51	Ctrl+D == EOF use getchar to get the characters from input and scan for EOF character. input is buffered so you can use a while loop with getchar to get a input string.
Kyro is offline

09-20-2003, 11:52 AM	#4
SirKnightTG Registered User Join Date: Sep 2003 Posts: 6	Great, thanks a lot guys! I was able to get this to work using visual C++ in a console app but with linux it seemed different. There were some functions I used before that my linux compiler did not know about so I wasn't sure what to do. It's been ages since I used C last so I forgot some of the functions. Thanks!
SirKnightTG is offline

09-20-2003, 11:58 AM	#5
twm root Join Date: Sep 2003 Posts: 232	>There were some functions I used before that my linux compiler did not know about Sounds like a case of Microsoftitis. Take two of these (ISO/IEC 9899:1999) and call me in the morning. I also recommend a strict regimen of Linux use for the next 50 years. Try to stay off Windows as well, it's bad for your mental health. __________________ The information given in this message is known to work on FreeBSD 4.8 STABLE. The above statement is false if I was too lazy to test it. Please take note that I am not a technical writer, nor do I care to become one. If someone finds a mistake, gleaming error or typo, do me a favor...bite me. Don't assume that I'm ever entirely serious or entirely joking.
twm is offline

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