5826e8eeb1
The pw_gecos field is not specified in POSIX, but is
present on most implementations.
passwd file format:
name:uid:gid:gecos:dir:shell
ex: gdm❌127:133:Gnome Display Manager:/var/lib/gdm3:/bin/false
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
99 lines
3.5 KiB
C
99 lines
3.5 KiB
C
/****************************************************************************
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* libs/libc/pwd/lib_getpwbufr.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 <pwd.h>
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#include "pwd/lib_pwd.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getpwbuf_r
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*
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* Description:
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* libc/grp internal helper function for getpwuid_r and getpwnam_r to setup
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* the caller supplied 'pwd' 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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* uid - Value to set the passwd structure's pw_uid field to.
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* gid - Value to set the passwd structure's pw_gid field to.
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* name - Value to set the passwd structure's pw_name field to.
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* gecos - Value to set the passwd structure's pw_gecos field to.
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* dir - Value to set the passwd structure's pw_dir field to.
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* shell - Value to set the passwd structure's pw_shell field to.
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* pwd - Pointer to the space to store the retrieved passwd structure
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* in.
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* buf - String fields pointed to by the passwd struct are stored here.
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* buflen - The length of buf in bytes.
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* result - Pointer to the resulting passwd struct, or NULL in case of
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* fail.
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*
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* Returned Value:
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* On success getpwgid_r returns 0 and sets *result to pwd. 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 getpwbuf_r(uid_t uid, gid_t gid, FAR const char *name,
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FAR const char *gecos, FAR const char *dir,
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FAR const char *shell, FAR struct passwd *pwd,
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FAR char *buf, size_t buflen, FAR struct passwd **result)
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{
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size_t reqdlen;
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reqdlen = strlen(name) + 1 + strlen(gecos) + 1 + strlen(dir) + 1 +
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strlen(shell) + 1;
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if (buflen < 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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pwd->pw_name = buf;
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pwd->pw_gecos = &buf[strlen(name) + 1];
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pwd->pw_dir = &buf[strlen(name) + strlen(gecos) + 2];
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pwd->pw_shell = &buf[strlen(name) + strlen(gecos) + strlen(dir) + 3];
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pwd->pw_uid = uid;
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pwd->pw_gid = gid;
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strcpy(pwd->pw_name, name);
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strcpy(pwd->pw_gecos, gecos);
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strcpy(pwd->pw_dir, dir);
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strcpy(pwd->pw_shell, shell);
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*result = pwd;
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return 0;
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}
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