calloc.c

来自「对内存的分配、释放和使用进行检查」· C语言 代码 · 共 71 行

/*
 * (c) Copyright 1990 Conor P. Cahill (uunet!virtech!cpcahil).  
 * You may copy, distribute, and use this software as long as this
 * copyright statement is not removed.
 */
#include <stdio.h>

/*
 * Function:	calloc()
 *
 * Purpose:	to allocate and nullify a data area
 *
 * Arguments:	nelem	- number of elements
 *		elsize	- size of each element
 *
 * Returns:	NULL	- if malloc fails
 *		or pointer to allocated space
 *
 * Narrative:	determine size of area to malloc
 *		malloc area.
 *		if malloc succeeds
 *		    fill area with nulls
 *		return ptr to malloc'd region
 */
#ifndef lint
static char rcs_header[] = "$Id: calloc.c,v 1.6 90/05/11 00:13:07 cpcahil Exp $";
#endif

char *
calloc(nelem,elsize)
	unsigned int 	  nelem;
	unsigned int 	  elsize;
{
	char		* malloc();
	char		* memset();
	char		* ptr;
	unsigned int	  size;

	size = elsize * nelem;

	if( (ptr = malloc(size)) != NULL)
	{
		(void) memset(ptr,'\0',(int)size);
	}

	return(ptr);
}


/*
 * $Log:	calloc.c,v $
 * Revision 1.6  90/05/11  00:13:07  cpcahil
 * added copyright statment
 * 
 * Revision 1.5  90/02/24  20:41:57  cpcahil
 * lint changes.
 * 
 * Revision 1.4  90/02/24  17:25:47  cpcahil
 * changed $header to $id so full path isn't included.
 * 
 * Revision 1.3  90/02/24  13:32:24  cpcahil
 * added function header.  moved log to end of file.
 * 
 * Revision 1.2  90/02/22  23:08:26  cpcahil
 * fixed rcs_header line
 * 
 * Revision 1.1  90/02/22  23:07:38  cpcahil
 * Initial revision
 * 
 */