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att
GitHub Repository: att/ast
 Path: blob/master/src/cmd/pzip/funzip.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1998-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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#include <ast.h>

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#include <error.h>

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#include <sfdcgzip.h>

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static const char usage[] =

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"[-?\n@(#)$Id: funzip (AT&T Research) 1998-08-11 $\n]"

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USAGE_LICENSE

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"[+NAME?funzip - fast gunzip]"

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"[+DESCRIPTION?\bfunzip\b decompresses \bgzip\b(1) compressed files."

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"	By default \bgzip\b crc32 cyclic redundancy checking is disabled."

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"	This may speed up decompression by 25% or more over \bgunzip\b(1)."

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"	Most data corruption errors are still caught even with crc disabled.]"

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"[x:crc?Enable \agzip\a crc32 cyclic redundancy checking for decompress."

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"	On some systems this can double the execution wall time."

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"	Most data corruption errors are still caught even with \bnocrc\b.]"

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"\n"

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"\n[ file ]\n"

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"\n"

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"[+SEE ALSO?\bgzip\b(1), \bgunzip\b(1), \blibz\b(3)]"

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;

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int

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main(int argc, char** argv)

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{

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	Sfio_t*	sp;

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	char*	file;

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	int	r;

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	int	flags = SFGZ_NOCRC;

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	error_info.id = "funzip";

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	for (;;)

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	{

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		switch (optget(argv, usage))

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		{

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		case 'x':

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			flags &= ~SFGZ_NOCRC;

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			continue;

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		case '?':

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			error(ERROR_USAGE|4, "%s", opt_info.arg);

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			continue;

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		case ':':

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			error(2, "%s", opt_info.arg);

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			continue;

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		}

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		break;

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	}

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	argv += opt_info.index;

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	if (error_info.errors || *argv && *(argv + 1))

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		error(ERROR_USAGE|4, "%s", optusage(NiL));

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	if (!(file = *argv))

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	{

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		file = "/dev/stdin";

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		sp = sfstdin;

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	}

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	else if (!(sp = sfopen(NiL, file, "r")))

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		error(ERROR_SYSTEM|3, "%s: cannot read", file);

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	if ((r = sfdcgzip(sp, flags)) < 0)

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		error(3, "sfdcgzip discipline push error");

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	else if (!r)

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		error(3, "input not a gzip file");

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	if (sfmove(sp, sfstdout, SF_UNBOUND, -1) < 0 || sfsync(sfstdout))

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		error(ERROR_SYSTEM|3, "sfdcgzip io error");

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	return 0;

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}

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