sharetab.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1989 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <string.h>
#include "sharetab.h"
static struct share * sharedup();
static void sharefree();
/*
* Get an entry from the share table.
* There should be at least 4 fields:
*
* pathname resource fstype options [ description ]
*
* A fifth field (description) is optional.
*
* Returns:
* > 1 valid entry
* = 0 end of file
* < 0 error
*/
int
getshare(fd, shp)
FILE *fd;
struct share **shp;
{
static char *line = NULL;
static struct share *sh = NULL;
register char *p;
char *w = " \t";
if (line == NULL) {
line = (char *) malloc(BUFSIZ+1);
if (line == NULL)
return (-1);
}
if (sh == NULL) {
sh = (struct share *) malloc(sizeof(*sh));
if (sh == NULL)
return (-1);
}
p = fgets(line, BUFSIZ, fd);
if (p == NULL)
return (0);
line[strlen(line) - 1] = '\0';
sh->sh_path = strtok(p, w);
if (sh->sh_path == NULL)
return (-1);
sh->sh_res = strtok(NULL, w);
if (sh->sh_res == NULL)
return (-1);
sh->sh_fstype = strtok(NULL, w);
if (sh->sh_fstype == NULL)
return (-1);
sh->sh_opts = strtok(NULL, w);
if (sh->sh_opts == NULL)
return (-1);
sh->sh_descr = strtok(NULL, "");
if (sh->sh_descr == NULL)
sh->sh_descr = "";
*shp = sh;
return (1);
}
/*
* Append an entry to the sharetab file.
*/
int
putshare(fd, sh)
FILE *fd;
struct share *sh;
{
int r;
if (fseek(fd, 0L, 2) < 0)
return (-1);
r = fprintf(fd, "%s\t%s\t%s\t%s\t%s\n",
sh->sh_path,
sh->sh_res,
sh->sh_fstype,
sh->sh_opts,
sh->sh_descr);
return (r);
}
/*
* The entry corresponding to path is removed from the
* sharetab file. The file is assumed to be locked.
* Read the entries into a linked list of share structures
* minus the entry to be removed. Then truncate the sharetab
* file and write almost all of it back to the file from the
* linked list.
* Note: The file is assumed to be locked.
*/
int
remshare(fd, path)
FILE *fd;
char *path;
{
struct share *sh_tmp;
struct shl { /* the linked list */
struct shl *shl_next;
struct share *shl_sh;
};
struct shl *shl_head = NULL;
struct shl *shl, *prev, *next;
int res, remcnt;
rewind(fd);
remcnt = 0;
while ((res = getshare(fd, &sh_tmp)) > 0) {
if (strcmp(path, sh_tmp->sh_path) == 0 ||
strcmp(path, sh_tmp->sh_res) == 0) {
remcnt++;
} else {
prev = shl;
shl = (struct shl *) malloc(sizeof(*shl));
if (shl == NULL) {
res = -1;
goto dealloc;
}
if (shl_head == NULL)
shl_head = shl;
else
prev->shl_next = shl;
shl->shl_next = NULL;
shl->shl_sh = sharedup(sh_tmp);
if (shl->shl_sh == NULL) {
res = -1;
goto dealloc;
}
}
}
if (res < 0)
goto dealloc;
if (remcnt == 0) {
res = 1; /* nothing removed */
goto dealloc;
}
if (ftruncate(fileno(fd), 0) < 0) {
res = -1;
goto dealloc;
}
for (shl = shl_head ; shl ; shl = shl->shl_next)
putshare(fd, shl->shl_sh);
res = 1;
dealloc:
for (shl = shl_head ; shl ; shl = next) {
sharefree(shl->shl_sh);
next = shl->shl_next;
free(shl);
}
return (res);
}
static struct share *
sharedup(sh)
struct share *sh;
{
struct share *nsh;
nsh = (struct share *) malloc(sizeof(*nsh));
if (nsh == NULL)
return (NULL);
nsh->sh_path = strdup(sh->sh_path);
if (nsh->sh_path == NULL)
goto alloc_failed;
nsh->sh_res = strdup(sh->sh_res);
if (nsh->sh_res == NULL)
goto alloc_failed;
nsh->sh_fstype = strdup(sh->sh_fstype);
if (nsh->sh_fstype == NULL)
goto alloc_failed;
nsh->sh_opts = strdup(sh->sh_opts);
if (nsh->sh_opts == NULL)
goto alloc_failed;
nsh->sh_descr = strdup(sh->sh_descr);
if (nsh->sh_descr == NULL)
goto alloc_failed;
return (nsh);
alloc_failed:
sharefree(nsh);
return (NULL);
}
static void
sharefree(sh)
struct share *sh;
{
if (sh == NULL)
return;
if (sh->sh_path != NULL)
free(sh->sh_path);
if (sh->sh_res != NULL)
free(sh->sh_res);
if (sh->sh_fstype != NULL)
free(sh->sh_fstype);
if (sh->sh_opts != NULL)
free(sh->sh_opts);
if (sh->sh_descr != NULL)
free(sh->sh_descr);
free(sh);
}
/*
* Return the value after "=" for option "opt"
* in option string "optlist".
*/
char *
getshareopt(optlist, opt)
char *optlist, *opt;
{
char *p, *pe;
char *b;
static char *bb;
if (bb)
free(bb);
b = bb = strdup(optlist);
if (b == NULL)
return (NULL);
while (p = strtok(b, ",")) {
b = NULL;
if (pe = strchr(p, '=')) {
*pe = '\0';
if (strcmp(opt, p) == 0)
return (pe + 1);
}
if (strcmp(opt, p) == 0)
return ("");
}
return (NULL);
}