make_room.c

seed格式数据解压程序,地震分析人员必备

/*===========================================================================*/
/* DMC interim out |         make_room.c                   | Utility         */
/*===========================================================================*/
/*
	Name:		make_room.c
	Purpose:	make large contiguous dynamic buffers
	Usage:		make_room( length, extra, bottom, top )
	Input:		int	length		size of allocation now
				int	extra		size it is to be extended
				char *bottom	bottom of existing buffer or NULL
				char *top		top of used part of buffer or NULL
								top may or may not be == bottom+len.
	Output:		none, may die here if memory allocation fails.
	Externals:	
	Warnings:	
	Errors:		
	Fatals:		allocation error
	Called by:	
	Calls to:	
	Algorithm:	if no buffer exists now, one is created.
				If one exists, it is expanded to fit at least
				length+extra.
	Notes:		
	Problems:	
	References:	
	Language:	ansi C
	Revisions:	21apr91	mark wiederspahn	written

				derived from big_buffer, which is no longer used.
*/

#include "output.h"

void make_room( length, extra, bottom, top )
int			length;
int			extra;
char		**bottom;
char		**top;
{
	int 	err;

	if( Debug > D_MAX ) fprintf( D_OUT,"[make_room] start\n");

	if( *bottom > *top || length < 0 || extra < 0 )
		err = error_handler( FATAL,"[make_room] bad args" );

	if( *bottom == NULL || *top == NULL )
	{
		if( (*bottom =
			(char *)malloc((unsigned)(length+extra+1))) == NULL )
			err = error_handler( FATAL,"[make_room] malloc failed" );
		*top = *bottom;
	}
	else
	{
		if( (*bottom =
			(char *)realloc(*bottom, (unsigned)(length+extra+1))) == NULL )
			err = error_handler(FATAL,"[make_room] realloc failed");
		*top = *bottom + length*sizeof(char);
	}

	if( Debug >= D_SOME )
		fprintf( D_OUT,"[make_room] btle = %d %d %d %d\n",
			(int)*bottom,(int)*top,length,extra );

	if( Debug > D_MAX ) fprintf( D_OUT,"[make_room] end\n");
}