Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!overload!dillon
From: dillon@overload.Berkeley.CA.US (Matthew Dillon)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: What is setmem in Aztec's c.lib for?
Message-ID: <dillon.3563@overload.Berkeley.CA.US>
Date: 16 Feb 91 20:01:13 GMT
References: <2662@opal.cs.tu-berlin.de>
Organization: Not an Organization
Lines: 38

In article <2662@opal.cs.tu-berlin.de> alcaman@opal.cs.tu-berlin.de (Alexander Weidt) writes:
>Hi..
>  I desperatley need some documentation on the setmem function found in
>Aztec's c.lib. The function is documented NOWHERE, and i am at a loss of
>
>Alexander Weidt     | UUCP: alcaman@tubopal.UUCP (alcaman@opal.cs.tu-berlin.de)

    setmem is pretty simple, it sets an area of memory to a character.
    You pass it a pointer to the base of the area to be jam set, the number
    of bytes, and the value to set each location to (0-255).  setmem()
    normally returns its first argument but different compilers might
    implement the return value differently.

    void *setmem(void *, size_t, int);

    As to how it works, in C it does this (but most compilers actually
    write the thing in assembly so it goes fast):

    void *
    setmem(base, bytes, c)
    void *base;
    long bytes;
    int c;
    {
	char *ptr = base;

	while (bytes--)
	    *ptr++ = (char)c;
	return(base);
    }

				    -Matt
--

    Matthew Dillon	    dillon@Overload.Berkeley.CA.US
    891 Regal Rd.	    uunet.uu.net!overload!dillon
    Berkeley, Ca. 94708
    USA