From: "Chewbaklava" <kalit AT ctel DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Implicit declaration
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Message-ID: <YBFq4.399$O2.11784@harpo>
Date: Wed, 16 Feb 2000 17:32:50 -0500
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

I have a rather simple program, it opens a fil, reads some stuff, allocates
2 arrays with malloc, and then prints them out and frees the arrays.  The
problem is, I get 2 error messages that, of course may be nothing, but may
be a problem waiting to happen.

code:
#include <stdio.h>

int main()
{
 FILE *file;
 int num_maps;
 char map_name[64];
 int width;
 int height;
 int i;
 int *map;
 int *props;


 if ((file = fopen("mike.dat", "r+")) == NULL)
 {
  printf("Error opening mike.dat");
  return 1;
 }

 fscanf(file, "%d", &num_maps);
 fscanf(file, "%d", &width);
 fscanf(file, "%d", &height);
 fseek(file, 1, SEEK_CUR);
 fgets(map_name, 64, file);

 map = (int *) malloc((width * height * sizeof(int)));  <<-- Warning here

 props = (int *) malloc((width * height * sizeof(int)));

 for ( i = 0; i < (width * height); i++)
   fscanf(file, "%d %d", &map[i], &props[i]);

 printf("\n%d", num_maps);
 printf("\n%d", width);
 printf("\n%d", height);
 printf("\n%s\n\n", map_name);

 for (i = 0; i < (width * height); i++)
   printf("%d  %d\n", map[i], props[i]);

 printf("%s\n\n", map_name);
 fclose(file);
 printf("%s\n\n", map_name);
 free(map);
 printf("%s\n\n", map_name);
 free(props);       <<-- Wanrning here
 printf("%s\n\n", map_name);

 return 0;
}

I am running this on a 486Dx2 66Mhz with 16MB RAM.

 - Chewbaklava
The honorable wookie presiding