diff options
Diffstat (limited to 'lib/libc/gen/getgrent.c')
| -rw-r--r-- | lib/libc/gen/getgrent.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/lib/libc/gen/getgrent.c b/lib/libc/gen/getgrent.c new file mode 100644 index 0000000..102546a --- /dev/null +++ b/lib/libc/gen/getgrent.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <grp.h> + +static FILE *_gr_fp; +static struct group _gr_group; +static int _gr_stayopen; +static int grscan(), start_gr(); + +#define MAXGRP 200 +static char *members[MAXGRP]; +#define MAXLINELENGTH 1024 +static char line[MAXLINELENGTH]; + +struct group * +getgrent() +{ + if (!_gr_fp && !start_gr() || !grscan(0, 0, NULL)) + return(NULL); + return(&_gr_group); +} + +struct group * +getgrnam(name) + const char *name; +{ + int rval; + + if (!start_gr()) + return(NULL); + rval = grscan(1, 0, name); + if (!_gr_stayopen) + endgrent(); + return(rval ? &_gr_group : NULL); +} + +struct group * +#ifdef __STDC__ +getgrgid(gid_t gid) +#else +getgrgid(gid) + gid_t gid; +#endif +{ + int rval; + + if (!start_gr()) + return(NULL); + rval = grscan(1, gid, NULL); + if (!_gr_stayopen) + endgrent(); + return(rval ? &_gr_group : NULL); +} + +static +start_gr() +{ + if (_gr_fp) { + rewind(_gr_fp); + return(1); + } + return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0); +} + +int +setgrent() +{ + return(setgroupent(0)); +} + +int +setgroupent(stayopen) + int stayopen; +{ + if (!start_gr()) + return(0); + _gr_stayopen = stayopen; + return(1); +} + +void +endgrent() +{ + if (_gr_fp) { + (void)fclose(_gr_fp); + _gr_fp = NULL; + } +} + +static +grscan(search, gid, name) + register int search, gid; + register char *name; +{ + register char *cp, **m; + char *bp; + char *fgets(), *strsep(), *index(); + + for (;;) { + if (!fgets(line, sizeof(line), _gr_fp)) + return(0); + bp = line; + /* skip lines that are too big */ + if (!index(line, '\n')) { + int ch; + + while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) + ; + continue; + } + _gr_group.gr_name = strsep(&bp, ":\n"); + if (search && name && strcmp(_gr_group.gr_name, name)) + continue; + _gr_group.gr_passwd = strsep(&bp, ":\n"); + if (!(cp = strsep(&bp, ":\n"))) + continue; + _gr_group.gr_gid = atoi(cp); + if (search && name == NULL && _gr_group.gr_gid != gid) + continue; + cp = NULL; + for (m = _gr_group.gr_mem = members;; bp++) { + if (m == &members[MAXGRP - 1]) + break; + if (*bp == ',') { + if (cp) { + *bp = '\0'; + *m++ = cp; + cp = NULL; + } + } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { + if (cp) { + *bp = '\0'; + *m++ = cp; + } + break; + } else if (cp == NULL) + cp = bp; + } + *m = NULL; + return(1); + } + /* NOTREACHED */ +} |
