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396f5b40ce
add support for POSIX defined confstr() Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_confstr.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <unistd.h>
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#include <errno.h>
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#include <string.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: confstr
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*
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* Description:
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* The confstr() function shall return the value of configuration-defined
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* string variables associated with the name argument.
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*
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* Returned Value:
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* If name is an invalid value, confstr() shall return 0 and set errno to
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* indicate the error.
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*
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* If name doesn't have a configuration-defined value, confstr() returns 0
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* and leaves errno unchanged.
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*
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* If name has a configuration-defined value, confstr() returns the size
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* of the buffer that would be needed to hold the entire string value.
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*
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****************************************************************************/
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size_t confstr(int name, FAR char *buf, size_t len)
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{
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FAR const char *p;
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switch (name)
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{
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/* System-defined default PATH */
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case _CS_PATH:
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{
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#ifdef CONFIG_PATH_INITIAL
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p = CONFIG_PATH_INITIAL;
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#else
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p = "\0";
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#endif
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break;
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}
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/* Programming environment is not supported on NuttX, so all
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* _CS_POSIX_V6 configuration variables are empty.
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*/
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case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
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case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
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case _CS_POSIX_V6_ILP32_OFF32_LIBS:
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case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
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case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
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case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
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case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
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case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
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case _CS_POSIX_V6_LP64_OFF64_LIBS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
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case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS:
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{
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p = "\0";
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break;
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}
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default:
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{
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set_errno(EINVAL);
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return 0;
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}
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}
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if (len != 0 && buf != NULL)
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{
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strlcpy(buf, p, len);
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}
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return (strlen(p) + 1);
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}
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