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getpwent.c revision 1.3 
      1 /*	$NetBSD: getpwent.c,v 1.3 1999/03/13 19:08:44 sommerfe Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Gordon W. Ross
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  * 4. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed by Gordon W. Ross
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Smaller replacement for: libc/gen/getpwent.c
     35  * Needed by programs like: rsh, rlogin
     36  */
     37 
     38 #include <stdio.h>
     39 #include <stdlib.h>
     40 #include <string.h>
     41 #include <pwd.h>
     42 
     43 #define	PWNULL	(struct passwd *)0
     44 #define MAXFIELD 8
     45 
     46 static char *pw_file = "/etc/passwd";
     47 static FILE *pw_fp;
     48 static char  pw_line[128];
     49 static struct passwd pw_ent;
     50 
     51 /*
     52  * Open passwd file if necessary, and
     53  * get the next entry.
     54  */
     55 struct passwd *
     56 getpwent()
     57 {
     58 	char *fv[MAXFIELD];
     59 	char *p;
     60 	int   fc;
     61 
     62 	/* Open passwd file if not already. */
     63 	if (pw_fp == NULL)
     64 		pw_fp = fopen(pw_file, "r");
     65 	/* Still NULL.  No passwd file? */
     66 	if (pw_fp == NULL)
     67 		return PWNULL;
     68 
     69 readnext:
     70 	/* Read the next line... */
     71 	if (fgets(pw_line, sizeof(pw_line), pw_fp) == NULL)
     72 		return PWNULL;
     73 
     74 	/* ...and parse it. */
     75 	p = pw_line;
     76 	fc = 0;
     77 	while (fc < MAXFIELD) {
     78 		fv[fc] = strsep(&p, ":\n");
     79 		if (fv[fc] == NULL)
     80 			break;
     81 		fc++;
     82 	}
     83 
     84 	/* Need at least 0..5 */
     85 	if (fc < 6)
     86 		goto readnext;
     87 	while (fc < MAXFIELD)
     88 		fv[fc++] = "";
     89 
     90 	/* Build the pw entry... */
     91 	pw_ent.pw_name   = fv[0];
     92 	pw_ent.pw_passwd = fv[1];
     93 	pw_ent.pw_uid = atoi(fv[2]);
     94 	pw_ent.pw_gid = atoi(fv[3]);
     95 	pw_ent.pw_gecos = fv[4];
     96 	pw_ent.pw_dir   = fv[5];
     97 	pw_ent.pw_shell = fv[6];
     98 
     99 	return (&pw_ent);
    100 }
    101 
    102 /* internal for setpwent() */
    103 int
    104 setpassent(stayopen)
    105 	int stayopen;
    106 {
    107 	if (pw_fp)
    108 		rewind(pw_fp);
    109 	return 1;
    110 }
    111 
    112 /* rewind to the beginning. */
    113 void
    114 setpwent()
    115 {
    116 	(void) setpassent(0);
    117 }
    118 
    119 /* done with the passwd file */
    120 void
    121 endpwent()
    122 {
    123 	if (pw_fp) {
    124 		fclose(pw_fp);
    125 		pw_fp = NULL;
    126 	}
    127 }
    128 
    129 struct passwd *
    130 getpwnam(name)
    131 	const char *name;
    132 {
    133 	struct passwd *pw;
    134 
    135 	setpwent();
    136 	while ((pw = getpwent()) != PWNULL)
    137 		if (!strcmp(pw->pw_name, name))
    138 			break;
    139 
    140 	endpwent();
    141 	return(pw);
    142 }
    143 
    144 struct passwd *
    145 getpwuid(uid)
    146 	uid_t uid;
    147 {
    148 	struct passwd *pw;
    149 
    150 	setpwent();
    151 	while ((pw = getpwent()) != PWNULL)
    152 		if (pw->pw_uid == uid)
    153 			break;
    154 
    155 	endpwent();
    156 	return(pw);
    157 }
    158 
    159 #ifdef	TEST_MAIN
    160 main() {
    161 	struct passwd *pw;
    162 
    163 	printf("#name, password, uid, gid, comment, dir, shell\n");
    164 
    165 	while ((pw = getpwent()) != NULL) {
    166 		printf("%s:%s:", pw->pw_name, pw->pw_passwd);
    167 		printf("%d:%d:", pw->pw_uid, pw->pw_gid);
    168 		printf("%s:", pw->pw_gecos);
    169 		printf("%s:", pw->pw_dir);
    170 		printf("%s\n", pw->pw_shell);
    171 	}
    172 }
    173 #endif
    174