132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
/*
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* SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2005 , Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2008 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include <sys/types.h>
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#include <grp.h>
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#include "defines.h"
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#include "prototypes.h"
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#define NFIELDS 4
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/*
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* list - turn a comma-separated string into an array of (char *)'s
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*
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* list() converts the comma-separated list of member names into
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* an array of character pointers.
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*
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* WARNING: I profiled this once with and without strchr() calls
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* and found that using a register variable and an explicit loop
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* works best. For large /etc/group files, this is a major win.
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*
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* FINALLY added dynamic allocation. Still need to fix sgetsgent().
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* --marekm
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*/
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static char **list (char *s)
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{
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static char **members = 0;
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static int size = 0; /* max members + 1 */
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int i;
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char **rbuf;
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i = 0;
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for (;;) {
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/* check if there is room for another pointer (to a group
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member name, or terminating NULL). */
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if (i >= size) {
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size = i + 100; /* at least: i + 1 */
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if (members) {
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rbuf =
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realloc (members, size * sizeof (char *));
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} else {
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/* for old (before ANSI C) implementations of
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realloc() that don't handle NULL properly */
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rbuf = malloc (size * sizeof (char *));
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}
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if (!rbuf) {
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if (members)
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free (members);
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members = 0;
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size = 0;
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return (char **) 0;
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}
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members = rbuf;
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}
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if (!s || s[0] == '\0')
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break;
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members[i++] = s;
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while (('\0' != *s) && (',' != *s)) {
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s++;
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}
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if ('\0' != *s) {
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*s++ = '\0';
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}
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}
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members[i] = (char *) 0;
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return members;
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}
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struct group *sgetgrent (const char *buf)
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{
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static char *grpbuf = 0;
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static size_t size = 0;
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static char *grpfields[NFIELDS];
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static struct group grent;
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int i;
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char *cp;
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if (strlen (buf) + 1 > size) {
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/* no need to use realloc() here - just free it and
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allocate a larger block */
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if (grpbuf)
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free (grpbuf);
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size = strlen (buf) + 1000; /* at least: strlen(buf) + 1 */
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grpbuf = malloc (size);
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if (!grpbuf) {
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size = 0;
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return 0;
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}
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}
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strcpy (grpbuf, buf);
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cp = strrchr (grpbuf, '\n');
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if (NULL != cp) {
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*cp = '\0';
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}
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for (cp = grpbuf, i = 0; (i < NFIELDS) && (NULL != cp); i++) {
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grpfields[i] = cp;
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cp = strchr (cp, ':');
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if (NULL != cp) {
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*cp = '\0';
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cp++;
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}
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}
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if (i < (NFIELDS - 1) || *grpfields[2] == '\0' || cp != NULL) {
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return (struct group *) 0;
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}
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grent.gr_name = grpfields[0];
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grent.gr_passwd = grpfields[1];
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if (get_gid (grpfields[2], &grent.gr_gid) == 0) {
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return (struct group *) 0;
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}
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grent.gr_mem = list (grpfields[3]);
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if (NULL == grent.gr_mem) {
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return (struct group *) 0; /* out of memory */
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}
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return &grent;
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}
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