174 lines
3.9 KiB
C
174 lines
3.9 KiB
C
/* $NetBSD: getpwent.c,v 1.3 1999/03/13 19:08:44 sommerfe Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* 4. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Gordon W. Ross
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Smaller replacement for: libc/gen/getpwent.c
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* Needed by programs like: rsh, rlogin
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pwd.h>
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#define PWNULL (struct passwd *)0
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#define MAXFIELD 8
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static char *pw_file = "/etc/passwd";
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static FILE *pw_fp;
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static char pw_line[128];
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static struct passwd pw_ent;
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/*
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* Open passwd file if necessary, and
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* get the next entry.
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*/
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struct passwd *
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getpwent()
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{
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char *fv[MAXFIELD];
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char *p;
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int fc;
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/* Open passwd file if not already. */
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if (pw_fp == NULL)
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pw_fp = fopen(pw_file, "r");
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/* Still NULL. No passwd file? */
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if (pw_fp == NULL)
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return PWNULL;
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readnext:
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/* Read the next line... */
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if (fgets(pw_line, sizeof(pw_line), pw_fp) == NULL)
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return PWNULL;
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/* ...and parse it. */
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p = pw_line;
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fc = 0;
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while (fc < MAXFIELD) {
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fv[fc] = strsep(&p, ":\n");
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if (fv[fc] == NULL)
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break;
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fc++;
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}
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/* Need at least 0..5 */
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if (fc < 6)
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goto readnext;
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while (fc < MAXFIELD)
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fv[fc++] = "";
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/* Build the pw entry... */
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pw_ent.pw_name = fv[0];
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pw_ent.pw_passwd = fv[1];
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pw_ent.pw_uid = atoi(fv[2]);
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pw_ent.pw_gid = atoi(fv[3]);
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pw_ent.pw_gecos = fv[4];
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pw_ent.pw_dir = fv[5];
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pw_ent.pw_shell = fv[6];
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return (&pw_ent);
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}
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/* internal for setpwent() */
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int
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setpassent(stayopen)
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int stayopen;
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{
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if (pw_fp)
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rewind(pw_fp);
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return 1;
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}
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/* rewind to the beginning. */
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void
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setpwent()
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{
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(void) setpassent(0);
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}
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/* done with the passwd file */
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void
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endpwent()
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{
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if (pw_fp) {
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fclose(pw_fp);
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pw_fp = NULL;
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}
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}
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struct passwd *
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getpwnam(name)
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const char *name;
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{
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struct passwd *pw;
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setpwent();
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while ((pw = getpwent()) != PWNULL)
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if (!strcmp(pw->pw_name, name))
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break;
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endpwent();
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return(pw);
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}
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struct passwd *
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getpwuid(uid)
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uid_t uid;
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{
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struct passwd *pw;
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setpwent();
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while ((pw = getpwent()) != PWNULL)
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if (pw->pw_uid == uid)
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break;
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endpwent();
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return(pw);
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}
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#ifdef TEST_MAIN
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main() {
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struct passwd *pw;
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printf("#name, password, uid, gid, comment, dir, shell\n");
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while ((pw = getpwent()) != NULL) {
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printf("%s:%s:", pw->pw_name, pw->pw_passwd);
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printf("%d:%d:", pw->pw_uid, pw->pw_gid);
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printf("%s:", pw->pw_gecos);
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printf("%s:", pw->pw_dir);
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printf("%s\n", pw->pw_shell);
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}
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}
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#endif
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