Ultrix-3.1/src/libc/stdio/getpwent.c

/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*	SCCSID: @(#)getpwent.c	3.0	4/22/86	*/
/*	(System 5)  getpwent.c	1.7	*/
/*LINTLIBRARY*/
#include <sys/param.h>
#include <stdio.h>
#include <pwd.h>

extern void rewind();
extern FILE *fopen();
extern int fclose();
extern char *fgets();

static char PASSWD[] = "/etc/passwd";
static char EMPTY[] = "";
static FILE *pwf = NULL;
static char line[BUFSIZ+1];
static struct passwd passwd;

void
setpwent()
{
	if(pwf == NULL)
		pwf = fopen(PASSWD, "r");
	else
		rewind(pwf);
}

void
endpwent()
{
	if(pwf != NULL) {
		(void) fclose(pwf);
		pwf = NULL;
	}
}

static char *
pwskip(p)
register char *p;
{
	while(*p && *p != ':' && *p != '\n')
		++p;
	if(*p == '\n')
		*p = '\0';
	else if(*p)
		*p++ = '\0';
	return(p);
}

struct passwd *
getpwent()
{
	extern struct passwd *fgetpwent();

	if(pwf == NULL) {
		if((pwf = fopen(PASSWD, "r")) == NULL)
			return(NULL);
	}
	return (fgetpwent(pwf));
}

struct passwd *
fgetpwent(f)
FILE *f;
{
	register char *p;

	p = fgets(line, BUFSIZ, f);
	if(p == NULL)
		return(NULL);
	passwd.pw_name = p;
	p = pwskip(p);
	passwd.pw_passwd = p;
	p = pwskip(p);
	if (p == NULL || *p == ':')
		/* check for non-null uid */
		return (NULL);
	passwd.pw_uid = atoi(p);
	p = pwskip(p);
	if (p == NULL || *p == ':')
		/* check for non-null uid */
		return (NULL);
	passwd.pw_gid = atoi(p);
	p = pwskip(p);
	passwd.pw_comment = EMPTY;
	passwd.pw_gecos = p;
	p = pwskip(p);
	passwd.pw_dir = p;
	p = pwskip(p);
	passwd.pw_shell = p;

    /*** No passwd aging code on ULTRIX-11
	(void) pwskip(p);

	p = passwd.pw_passwd;
	while(*p && *p != ',')
		p++;
	if(*p)
		*p++ = '\0';
	passwd.pw_age = p;
    ***/

	while(*p && *p != '\n') p++;
	*p = '\0';
	return(&passwd);
}