make_blk72.c

来自「seed格式数据解压程序,地震分析人员必备」· C语言 代码 · 共 50 行

/*===========================================================================*/
/* UTIG DMC        |            make_blk72.c               | Utility         */
/*===========================================================================*/
/*
	Name:		make_blk72.c

	Purpose:	allocate and link a timespan node
	Usage:		struct blk72_list *make_blk72( head, tail )
	Input:		struct	blk72_list	**head
				struct	blk72_list	**tail
	Output:		pointer to created node
	Externals:	
	Warnings:	
	Errors:		
	Fatals:		calloc returns no space
	Called by:	
	Calls to:	error_handler()
	Algorithm:	If the list is empty, then both head and tail will be null.
				(eg *head = NULL). If there are any nodes on the list, the
				*head and *tail point to the ends; a node is linked in
				in either case.
	Notes:		
	Problems:	
	References:	
	Language:	
	Revisions:	03/10/89	mark wiederspahn	written
*/

#include "output.h"

struct blk72_list *make_blk72( head )
struct	blk72_list	**head;
{

	while (*head != NULL) *head = (*head)->next;
/*
 * if this is the first node, point both head and tail to new node
 * else add one onto the existing list at the end.
 */
	*head = 
		(struct blk72_list *)calloc( 1, sizeof(struct blk72_list) );

	if( *head == NULL )
		error_handler( FATAL,"[make_blk72] no space" );
	else
		(*head)->next = NULL;

	return( *head );
}