101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/****************************************************************************
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* libs/libc/grp/lib_getgrbufr.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <grp.h>
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#include "grp/lib_grp.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getgrbuf_r
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*
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* Description:
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* libc/grp internal helper function for getgrgid_r and getgrnam_r to setup
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* the caller supplied 'grp' and 'buf' buffers once a matching entry has
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* been found.
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*
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* Input Parameters:
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* gid - Value to set grp->gr_gid to.
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* name - Value to set grp->gr_name to.
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* passwd - Value to set grp->passwd to.
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* grp - Pointer to the space to store the retrieved group structure in.
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* buf - String fields pointed to by the group struct are stored here.
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* buflen - The length of buf in bytes.
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* result - Pointer to the resulting group struct, or NULL in case of fail.
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*
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* Returned Value:
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* On success getgrgid_r returns 0 and sets *result to grp. In case of
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* failure an error number is returned.
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*
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****************************************************************************/
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int getgrbuf_r(gid_t gid, FAR const char *name, FAR const char *passwd,
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FAR struct group *grp, FAR char *buf, size_t buflen,
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FAR struct group **result)
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{
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size_t reqdlen;
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size_t padlen;
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size_t namesize;
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size_t passwdsize;
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/* In 'buf' a NULL pointer value will be stored, which must be naturally
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* aligned, followed by the null terminated group name string and the null
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* terminated passwd string 'x' (indicating 'no password'). Make sure
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* sufficient buffer space was supplied by the caller.
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*/
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namesize = strlen(name) + 1;
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passwdsize = strlen(passwd) + 1;
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padlen = sizeof(FAR void *) - ((uintptr_t)buf % sizeof(FAR char *));
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reqdlen = sizeof(FAR void *) + namesize + passwdsize;
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if (buflen < padlen + reqdlen)
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{
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/* Insufficient buffer space supplied. */
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*result = NULL;
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return ERANGE;
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}
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grp->gr_mem = (FAR char **)&buf[padlen];
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grp->gr_name = &buf[padlen + sizeof(FAR char *)];
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grp->gr_passwd = &buf[padlen + sizeof(FAR char *) + namesize];
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strlcpy(grp->gr_name, name, namesize);
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strlcpy(grp->gr_passwd, passwd, passwdsize);
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grp->gr_gid = gid;
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*grp->gr_mem = NULL;
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*result = grp;
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return 0;
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}
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