getline function

Giorgos Keramidas keramida at
Sat Feb 18 16:18:26 PST 2006

On 2006-02-18 15:33, Tom Grove <freebsd at> wrote:
>Chuck Swiger wrote:
>>Tom Grove wrote:
>>>Chuck Swiger wrote:
>>[ ... ]
>>>> getline() is not part of the standard C library.
>>>> What makes you think gcc is broken...?
>>> Yeah...I see that after some more research.  So, now I guess my question
>>> is being that it's not standard and gets() is not safe to use what
>>> should I use to grab lines?  My gut tells me to copy the getline()
>>> function from the K&R book but I'm not totally sure that's a great idea
>>> either.  Stupid strings always causing problems!
>> Depending on what you'd like to do, GNU readline may be a fine
>> solution to your situation.  Otherwise, getch(stdin) with a bit of
>> code to "cook" DEL/BS/CR/NL, or just use the getline port as you've
>> already done.  :-)
> Okay...I think I'm either an idiot or going slowly insane.  I'll admit
> I'm not the most savvy C programmer but the following code gives me an
> error:
> ## Source File##
> #include <stdio.h>
> #include <readline/readline.h>
> #include <readline/history.h>
> int main() {
>        char *line;
>        line = readline("Test: ");
>        return 0;
> }
> ##Source File##
> ##Error##
> /var/tmp//ccqxIZxQ.o(.text+0x25): In function `main':
> : undefined reference to `readline'
> ##Error##

You're missing an ``-lreadline'' option at the end of your build command.

You may be interested to know that the BSDs have editline(3) too, a
command-line editing library that supports at least `some' of the GNU
readline features, but is BSD-licensed:

    % man editline

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