forked from Qortal/Brooklyn
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/*
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Copyright (c) 2012, Broadcom Europe Ltd
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "interface/vcos/vcos.h"
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#if defined( __KERNEL__ )
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#include <linux/string.h>
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#include <linux/module.h>
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#else
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#include <string.h>
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#endif
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#include <stdarg.h>
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/** Like vsnprintf, except it places the output at the specified offset.
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* Output is truncated to fit in buflen bytes, and is guaranteed to be NUL-terminated.
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* Returns the string length before/without truncation.
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*/
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size_t vcos_safe_vsprintf(char *buf, size_t buflen, size_t offset, const char *fmt, va_list ap)
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{
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size_t space = (offset < buflen) ? (buflen - offset) : 0;
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offset += vcos_vsnprintf(buf ? (buf + offset) : NULL, space, fmt, ap);
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return offset;
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}
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/** Like snprintf, except it places the output at the specified offset.
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* Output is truncated to fit in buflen bytes, and is guaranteed to be NUL-terminated.
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* Returns the string length before/without truncation.
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*/
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size_t vcos_safe_sprintf(char *buf, size_t buflen, size_t offset, const char *fmt, ...)
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{
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size_t space = (offset < buflen) ? (buflen - offset) : 0;
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va_list ap;
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va_start(ap, fmt);
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offset += vcos_vsnprintf(buf ? (buf + offset) : NULL, space, fmt, ap);
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va_end(ap);
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return offset;
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}
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/** Copies string src to dst at the specified offset.
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* Output is truncated to fit in dstlen bytes, i.e. the string is at most
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* (buflen - 1) characters long. Unlike strncpy, exactly one NUL is written
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* to dst, which is always NUL-terminated.
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* Returns the string length before/without truncation.
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*/
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size_t vcos_safe_strcpy(char *dst, const char *src, size_t dstlen, size_t offset)
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{
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if (offset < dstlen)
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{
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const char *p = src;
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char *endp = dst + dstlen -1;
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dst += offset;
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for (; *p!='\0' && dst != endp; dst++, p++)
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*dst = *p;
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*dst = '\0';
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}
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offset += strlen(src);
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return offset;
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}
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