2710e4d1ef
What it is:
A library for reading and writing various streaming archive
formats, especially tar and cpio. Being a library, it should
be easy to incorporate into pkg_* tools, sysinstall, and any
other place that needs to read or write such archives.
Features:
* Full automatic detection of both compression and archive format.
* Extensible internal architecture to make it easy to add new formats.
* Support for "pax interchange format," a new POSIX-standard tar format
that eliminates essentially all of the restrictions of historic formats.
* BSD license
Thanks to: jkh for pushing me to start this work, gordon for
encouraging me to commit it, bde for answering endless style
questions, and many others for feedback and encouragement.
Status: Pretty good overall, though there are still a few rough edges and
the library could always use more testing. Feedback eagerly solicited.
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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*
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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
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* are met:
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* 1. 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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* in this position and unchanged.
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* 2. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* This uses 'printf' family functions, which can cause issues
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* for size-critical applications. I've separated it out to make
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* this issue clear. (Currently, it is called directly from within
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* the core code, so it cannot easily be omitted.)
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*/
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#ifdef DMALLOC
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#include <dmalloc.h>
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#endif
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#include <err.h>
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#include <stdio.h>
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#include "archive_string.h"
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/*
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* Like 'vsprintf', but ensures the target is big enough, resizing if
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* necessary.
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*/
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void
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__archive_string_vsprintf(struct archive_string *as, const char *fmt,
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va_list ap)
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{
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size_t l;
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if (fmt == NULL) {
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as->s[0] = 0;
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return;
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}
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l = vsnprintf(as->s, as->buffer_length, fmt, ap);
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/* If output is bigger than the buffer, resize and try again. */
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if (l+1 >= as->buffer_length) {
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__archive_string_ensure(as, l + 1);
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l = vsnprintf(as->s, as->buffer_length, fmt, ap);
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}
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}
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/*
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* Corresponding 'sprintf' interface.
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*/
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void
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__archive_string_sprintf(struct archive_string *as, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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__archive_string_vsprintf(as, fmt, ap);
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va_end(ap);
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}
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