58e97e521c
Add the `LIBC_PREVENT_STRING_KERNEL` and `LIBC_PREVENT_STRING_USER` that are meant to be selected by the chip if no libc implementation is going to be built. If selected, neither NuttX's software version of the libc nor any architecture-specific implementation will be built in the kernel or in the userspace, respectively. In this case, the linker may provide a ROM-defined version of the libc functions instead.
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/****************************************************************************
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* libs/libc/string/lib_strlcat.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 <sys/types.h>
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#include <string.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strlcat
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*
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* Description:
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* The strlcat() function appends at most (dstsize-strlen(dst)-1)
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* characters of src to dst (dstsize being the size of the string buffer
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* dst).
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*
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* Returned Value:
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* Returns min{dstsize,strlen(dst)} + strlen(src).
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*
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****************************************************************************/
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#if !defined(CONFIG_LIBC_ARCH_STRLCAT) && defined(LIBC_BUILD_STRING)
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size_t strlcat(FAR char *dst, FAR const char *src, size_t dsize)
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{
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FAR const char *odst = dst;
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FAR const char *osrc = src;
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size_t n = dsize;
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size_t dlen;
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/* Find the end of dst and adjust bytes left but don't go past end. */
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while (n-- != 0 && *dst != '\0')
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{
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dst++;
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}
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dlen = dst - odst;
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n = dsize - dlen;
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if (n-- == 0)
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{
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return dlen + strlen(src);
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}
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while (*src != '\0')
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{
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if (n != 0)
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{
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*dst++ = *src;
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n--;
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}
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src++;
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}
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*dst = '\0';
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/* Count does not include NUL */
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return dlen + (src - osrc);
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}
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#endif
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