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Groups > comp.lang.c > #16057

zero up memory

From "Mark" <mark_cruzNOTFORSPAM@hotmail.com>
Newsgroups comp.lang.c
Subject zero up memory
Date 2012-01-23 10:51 -0500
Organization Aioe.org NNTP Server
Message-ID <jfjvmb$sod$1@speranza.aioe.org> (permalink)

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Hello,

consider the following code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#define NAME_LEN 16
#define MAX_INSTANCES 64

struct inst_info
{
  uint32_t state;
  uint32_t port_mem;
};

struct vid_entry
{
  struct vid_entry *prev;
  struct vid_entry *next;
  uint16_t vid;
  uint32_t vid_state;
};

struct hsl
{
  char name[NAME_LEN + 1];
  uint32_t ageing_time;
  unsigned char flags;
  int learning;

  /* Platform specific information. */
  void *system_info;

  struct vid_entry *inst_table[MAX_INSTANCES];
  struct inst_info inst_info_table[MAX_INSTANCES];
};

int main(void)
{
  struct hsl *br;

  br = malloc (sizeof (struct hsl));
  if ( !br)
  {
    puts("malloc() failed");
    return -1;
  }

  memset ((void *)&br->inst_info_table, 0, sizeof (struct inst_info) * 
MAX_INSTANCES);
  memset ((void *)&br->inst_table, 0, sizeof (struct vid_entry *) * 
MAX_INSTANCES);

  free (br);

  return 0;
}

As I understand it, 'inst_table' is the array of pointers to 'struct 
vid_entry' and on my system pointer is 32-bit wide, so I want to make sure 
that the code is correctly initializing memory allocated for 'struct hsl' 
object.

Also, is (void *) necessary or more a pedantic element?

Thanks !

Mark

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Thread

zero up memory "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-01-23 10:51 -0500
  Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-23 16:30 +0000
  Re: zero up memory Johann Klammer <klammerj@NOSPAM.a1.net> - 2012-01-23 17:57 +0100
    Re: zero up memory Kenneth Brody <kenbrody@spamcop.net> - 2012-01-23 12:07 -0500
    Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-23 09:08 -0800
      Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-23 09:22 -0800
        Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-23 10:13 -0800
          Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-23 12:00 -0800
        Re: zero up memory Kaz Kylheku <kaz@kylheku.com> - 2012-01-23 20:14 +0000
          Re: zero up memory "Joel C. Salomon" <joelcsalomon@gmail.com> - 2012-01-23 16:46 -0500
          Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-23 14:05 -0800
            Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-23 23:21 +0000
              Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-24 09:35 -0800
                Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-24 20:56 +0000
                Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-24 14:07 -0800
                Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-25 17:38 +0000
                Re: zero up memory Johann Klammer <klammerj@NOSPAM.a1.net> - 2012-01-24 23:15 +0100
                Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-24 14:31 -0800
                Re: zero up memory Kleuske <kleuske@nowhere.net> - 2012-01-25 15:39 +0000
                Re: zero up memory Kleuske <kleuske@nowhere.net> - 2012-01-25 15:49 +0000
                Re: zero up memory Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-26 03:09 -0800
                Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-25 13:05 -0800
                Re: zero up memory Sjouke Burry <s@b> - 2012-01-25 23:25 +0000
                Re: zero up memory Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-26 03:11 -0800
                Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-26 11:48 -0800
                Re: zero up memory gordonb.p79fg@burditt.org (Gordon Burditt) - 2012-03-12 17:55 -0500
                Re: zero up memory James Kuyper <jameskuyper@verizon.net> - 2012-03-12 22:10 -0400
                Re: zero up memory Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-03-12 23:24 -0400
                Re: zero up memory James Kuyper <jameskuyper@verizon.net> - 2012-03-12 23:53 -0400
                Re: zero up memory gordonb.pu5nu@burditt.org (Gordon Burditt) - 2012-03-13 00:58 -0500
                Re: zero up memory James Kuyper <jameskuyper@verizon.net> - 2012-03-14 11:17 -0400
                Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-26 11:19 -0800
                Re: zero up memory Kleuske <kleuske@nowhere.net> - 2012-01-27 08:13 +0000
                Re: zero up memory Kleuske <kleuske@nowhere.net> - 2012-01-26 14:42 +0000
                Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-25 12:33 -0800
                Re: zero up memory Kleuske <kleuske@nowhere.net> - 2012-01-26 14:12 +0000
                Re: zero up memory James Kuyper <jameskuyper@verizon.net> - 2012-01-24 17:43 -0500
                Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-24 16:29 -0800
                Re: zero up memory James Kuyper <jameskuyper@verizon.net> - 2012-01-24 21:43 -0500
                Re: zero up memory Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-24 23:58 -0800
                Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-25 17:52 +0000
                Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-25 17:48 +0000
                Re: zero up memory Robert Wessel <robertwessel2@yahoo.com> - 2012-01-25 12:15 -0600
                Re: zero up memory blp@cs.stanford.edu (Ben Pfaff) - 2012-01-25 10:35 -0800
                Re: zero up memory Robert Wessel <robertwessel2@yahoo.com> - 2012-01-25 17:15 -0600
                Re: zero up memory Robert Wessel <robertwessel2@yahoo.com> - 2012-01-25 17:23 -0600
                Re: zero up memory "BartC" <bc@freeuk.com> - 2012-01-25 23:51 +0000
                Re: zero up memory Robert Wessel <robertwessel2@yahoo.com> - 2012-01-26 18:35 -0600
                Re: zero up memory James Kuyper <jameskuyper@verizon.net> - 2012-01-25 13:17 -0500
          Re: zero up memory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-23 22:55 +0000
      Re: zero up memory jgk@panix.com (Joe keane) - 2012-01-24 20:45 +0000
        Re: zero up memory Keith Thompson <kst-u@mib.org> - 2012-01-24 14:13 -0800

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