NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part2/13148

Text File | 1996-08-05 | 2.1 KB | 61 lines

Path: sun001.spd.dsccc.com!jmccarty
From: [e-mail] (Mike McCarty)
Newsgroups: comp.lang.c,comp.unix.programmer
Subject: Re: Q: '\n' character - strtok trick
Date: 4 Apr 1996 22:49:49 GMT
Organization: DSC Communications Corporation
Message-ID: <4k1jmd$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <4ju9m0$[e-mail]>
NNTP-Posting-Host: sun1307.spd.dsccc.com

In article <4ju9m0$[e-mail]>, BOFH <[e-mail]> wrote:
)[e-mail] wrote:
): Although the behaviour of strtok() is well defined I try to avoid it like the
): plague because it uses a static area to maintain state. If another function
): happens to call it between successive invocations then your screwd.
)
)Well, yes it does use a static data area to store it's state, but that
)doesn't matter.  When you call the function this way, strtok will return
)a pointer to the beginning of the string that it chopped a newline off
)of, AND will insert a NULL character into the location of the newline.
)After it returns, you are done.  Your string has had the newline taken
)off, and you are done with strtok.  strtok will internally remember where
)it last took a delimiter off, but it only needs it when strtok is called
)with a NULL buffer anyway.
)
)The only problem with this is that you could be in the middle of parsing
)a string with strtok, and then you attempted to strtok(buffer,...), which
)would definately cause a problem.
)
)My $0.02.
)
)
)Randy Scott <[e-mail]>


I usually do this (from memory only, so argument order etc. may be off):

    boolean    readline(char *buffer,size_t max_size,FILE *stream) {
        boolean    result;
        size_t    place;

        if (fgets(buffer,max_size,stream) == NULL)
            result = false;
        else {
            place = strlen(buffer)-1;
            if (place >= 0 && buffer[place] == '\n')
                buffer[place] = '\0';
            result = true;
        }
        return result;
    }

And then exclusively call readline(.,.,.) in my program.

Mike
--
----
char *p="char *p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}

I don't speak for DSC.         <- They make me say that.