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/usr/include/I2util/conf.h is in libi2util-dev 1.2-1.

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/*
 *      $Id: conf.h 216 2012-10-16 19:57:01Z aaron $
 */
/************************************************************************
*									*
*			     Copyright (C)  2003			*
*				Internet2				*
*			     All Rights Reserved			*
*									*
************************************************************************/
/*
 *	File:		conf.h
 *
 *	Author:		Jeff W. Boote
 *			Internet2
 *
 *	Date:		Tue Sep 16 14:28:48 MDT 2003
 *
 *	Description:	
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
#ifndef	_i2_conf_h_
#define	_i2_conf_h_

#include <I2util/util.h>

#include <stdio.h>

/*
 * Growth increment for linebuffer.
 */
#define I2LINEBUFINC	(120)

/*
 * same charactors isspace checks for - useful for strtok splits
 * of whitespace.
 */
#define I2WSPACESET   "\t\n\v\f\r "

/*
 * Maximum "identity"/"username" charactor length
 */
#define I2MAXIDENTITYLEN	(16)

/*
 * Length of a key in bytes.
 */
#define	I2KEYLEN		(16)

extern int
I2GetConfLine(
	I2ErrHandle	eh,
	FILE		*fp,
	int		rc,
	char		**lbuf,
	size_t		*lbuf_max
	);

extern int
I2ReadConfVar(
	FILE	*fp,
	int	rc,
	char	*key,
	char	*val,
	size_t	max,
	char	**lbuf,
	size_t	*lbuf_max
	);

/*
 * lbuf will contain an undisturbed copy of the last line to be parsed in
 * the file. (It is the callers responsibility to free the memory pointed
 * to by lbuf after calling this function.)
 *
 */
extern int
I2ParseKeyFile(
	I2ErrHandle eh,
	FILE	    *fp,
	int	    rc,
	char	    **lbuf,
	size_t	    *lbuf_max,
	FILE	    *tofp,	/* copy 'to' file, or null */
	const char  *id_query,
	char	    *id_ret,	/* [I2MAXIDENTITYLEN+1] or null */
	uint8_t	    *key_ret	/* [I2KEYLEN] or null */
	);

extern int
I2WriteKeyLine(
	I2ErrHandle     eh,
	FILE	        *fp,
	const char      *id,	/* no more than [I2MAXIDENTITYLEN+1] */
	const uint8_t   *key	/* [I2KEYLEN] */
	);

/*
 * lbuf will NOT contain an undisturbed copy of the last line to be parsed in
 * the file. lbuf is just a memory buffer to be used by the function, and
 * realloc'd as needed.
 *
 * It is the callers responsibility to free the memory pointed
 * to by lbuf after calling this function.
 *
 */
extern int
I2ParsePFFile(
	I2ErrHandle	eh,
	FILE		*fp,
	FILE		*tofp,
	int		rc,
        const char      *id_query,
        char            **id_ret,   /* nul terminated, points in lbuf */
        char            **pf_ret,   /* points in lbuf */
        size_t          *pf_len,
	char		**lbuf,
	size_t		*lbuf_max
	);

/*
 * lbuf has same semantics as above, caller must free memory eventually.
 */
extern int
I2WritePFLine(
	I2ErrHandle	eh,
	FILE		*fp,
	const char	*id,
        const uint8_t   *bytes,
        size_t          nbytes,
        char            **lbuf,
        size_t          *lbuf_max
	);

typedef uint64_t	I2numT;

/*
 * These two functions are destructive to the passed in string.
 * StrToNum interprets k/m/g as base 10 numbers,
 * StrToBytes interprets k == 1024 etc...
 */
extern int
I2StrToNum(
	I2numT		*numret,
	char		*str
	  );

extern int
I2StrToByte(
	I2numT		*numret,
	char		*str
	  );

#endif	/* _i2_conf_h_ */