146 lines
4.3 KiB
C
146 lines
4.3 KiB
C
/****************************************************************************
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* libs/libc/string/lib_strerror.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 <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define STRERROR_UNKNOWN "Unknown error"
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#define STRERROR_BUFSIZE sizeof(STRERROR_UNKNOWN " 2000")
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct errno_strmap_s
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{
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uint8_t errnum;
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FAR char *str;
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#ifdef CONFIG_LIBC_STRERROR
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/* This table maps all error numbers to descriptive strings.
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* The only assumption that the code makes with regard to this
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* this table is that it is ordered by error number.
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*
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* The size of this table is quite large. Its size can be
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* reduced by eliminating some of the more obscure error
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* strings.
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*/
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#ifndef CONFIG_LIBC_STRERROR_SHORT
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static const struct errno_strmap_s g_errnomap[] =
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{
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{ 0, "Success" },
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#define ERRNO_ITEM(name, id, str) \
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{ name, str },
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#include <nuttx/errno_lookup.h>
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#undef ERRNO_ITEM
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};
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#else /* CONFIG_LIBC_STRERROR_SHORT */
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static const struct errno_strmap_s g_errnomap[] =
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{
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{ 0, "OK" },
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#define ERRNO_ITEM(name, id, str) \
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{name, #name },
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#include <nuttx/errno_lookup.h>
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#undef ERRNO_ITEM
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};
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#endif /* CONFIG_LIBC_STRERROR_SHORT */
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#define NERRNO_STRS (sizeof(g_errnomap) / sizeof(struct errno_strmap_s))
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#endif /* CONFIG_LIBC_STRERROR */
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strerror
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****************************************************************************/
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FAR char *strerror(int errnum)
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{
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#ifdef CONFIG_LIBC_STRERROR_ERRNUM
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static char s_err[STRERROR_BUFSIZE];
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#endif
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#ifdef CONFIG_LIBC_STRERROR
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int ndxlow = 0;
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int ndxhi = NERRNO_STRS - 1;
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int ndxmid;
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do
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{
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ndxmid = (ndxlow + ndxhi) >> 1;
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if (errnum > g_errnomap[ndxmid].errnum)
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{
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ndxlow = ndxmid + 1;
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}
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else if (errnum < g_errnomap[ndxmid].errnum)
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{
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ndxhi = ndxmid - 1;
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}
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else
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{
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return g_errnomap[ndxmid].str;
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}
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}
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while (ndxlow <= ndxhi);
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#endif
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#ifdef CONFIG_LIBC_STRERROR_ERRNUM
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if (snprintf(s_err, sizeof(s_err), STRERROR_UNKNOWN " %d", errnum)
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< sizeof(s_err))
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{
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return s_err;
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}
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#elif !defined(CONFIG_LIBC_STRERROR)
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UNUSED(errnum);
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#endif
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return STRERROR_UNKNOWN;
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}
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