Reg: strncpy function Post: 302092528

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Top Forums Programming Reg: strncpy function Post 302092528 by jim mcnamara on Tuesday 10th of October 2006 01:50:05 PM

10-10-2006

Registered User

I stayed out of this, but memcpy and strncpy don't append a trailing '\0', that' why you should consider memset()

Run this code and see if you see a trailing '\0' after "HI THERE".

Code:

#include <strings.h>
int main()
{
        char tmp[32];
        memset(tmp,'%',32);
        strncpy(tmp,"HI THERE",3);
        {
                char *p=tmp;
                int i=0;
                for(i=0;i<32;i++,p++) printf("%2d ",*p);
                printf("\n");
        }
        return 0;
}

This is what I get:

Code:

kcsdev:/home/jmcnama> cat t.c
#include <strings.h>
int main()
{
        char tmp[32];
        memset(tmp,'%',32);
        strncpy(tmp,"HI THERE",3);
        {
                char *p=tmp;
                int i=0;
                for(i=0;i<32;i++,p++) printf("%2d ",*p);
                printf("\n");
        }
        return 0;
}
kcsdev:/home/jmcnama> cc t.c
kcsdev:/home/jmcnama> a.out
72 73 32 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37 37
kcsdev:/home/jmcnama>

jim mcnamara

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LEARN ABOUT DEBIAN

ns_tmpnam

ns_tmp(3aolserver)					    AOLserver Built-In Commands 					ns_tmp(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME

       ns_mktemp, ns_tmpnam - commands

SYNOPSIS

       ns_mktemp template

       ns_tmpnam
_________________________________________________________________

DESCRIPTION

       ns_mktemp  returns  a unique filename based on the template you specify.  ns_tmpnam returns a filename that can safely be used for a tempo-
       rary file.

       The template for ns_mktemp should contain a string with six trailing Xs, which will be replaced with an alpha-numeric string of six charac-
       ters chosen to make the filename unique.  If template does not end with six trailing Xs the empty string will be returned.

       ns_tmpnam  calls  the  tmpnam()	C  library function, and the results will depend on your operating system.  On Irix, for example, tmpnam()
       always generate a file name using the path-prefix defined as P_tmpdir in the header file which is "/var/tmp/".

EXAMPLES

	nscp> ns_tmpnam ;# On Linux
	/tmp/filevuLwaE

	nscp> ns_mktemp /tmp/foobar.XXXXXX
	/tmp/foobar.p6SlaC

SEE ALSO

       nsd(1), mktemp(3), tmpnam(3)

KEYWORDS

AOLserver								4.0							ns_tmp(3aolserver)

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