BSD 4_3_Tahoe release

[unix-history] / usr / src / lib / libc / gen / getgrent.c

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getgrent.c  5.3 (Berkeley) 11/5/87";
#endif LIBC_SCCS and not lint

#include <stdio.h>
#include <grp.h>

#define MAXGRP  200

static char *GROUP = "/etc/group";
static FILE *grf = NULL;
static char line[BUFSIZ+1];
static struct group group;
static char *gr_mem[MAXGRP];

setgrent()
{
       if( !grf )
               grf = fopen( GROUP, "r" );
       else
               rewind( grf );
}

endgrent()
{
       if( grf ){
               fclose( grf );
               grf = NULL;
       }
}

static char *
grskip(p,c)
register char *p;
register c;
{
       while( *p && *p != c ) ++p;
       if( *p ) *p++ = 0;
       return( p );
}

struct group *
getgrent()
{
       register char *p, **q;

       if( !grf && !(grf = fopen( GROUP, "r" )) )
               return(NULL);
       if( !(p = fgets( line, BUFSIZ, grf )) )
               return(NULL);
       group.gr_name = p;
       group.gr_passwd = p = grskip(p,':');
       group.gr_gid = atoi( p = grskip(p,':') );
       group.gr_mem = gr_mem;
       p = grskip(p,':');
       grskip(p,'\n');
       q = gr_mem;
       while( *p ){
               if (q < &gr_mem[MAXGRP-1])
                       *q++ = p;
               p = grskip(p,',');
       }
       *q = NULL;
       return( &group );
}

setgrfile(file)
       char *file;
{
       GROUP = file;
}