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92 lines
3.3 KiB
92 lines
3.3 KiB
/* |
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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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