Programa simples mostrando como usar a função stat(), e como manipular aquivos de uma forma bem simples. Ponteiros também são usados.

Baixe:

$ tar -xzvf loadfile.tar.gz
$ cd loadfile
$ ./loadfile text

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Esconder código-fonte

/* loadfile.c */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>

int main ( int argc, char *argv[] )
{
   char *fullfile, *p, *p2, c ;
   struct stat fileinfo;
   
   FILE *openfile;

   if ( argc < 2 )
   {
      printf ( "[*] Usage: %s <file>\n", argv[0] );
      exit ( EXIT_FAILURE );
   }

   /* read-binary permission */
   openfile = fopen ( argv[1], "rb" );
   if ( !openfile )
   {
      printf ( "[*] Can't open file %s\n", argv[1] );
      exit ( EXIT_FAILURE );
   }
   
   /* file info for file size */
   if ( stat ( argv[1], &fileinfo ) == -1 )
   {
      printf ( "[*] Can't stat() file %s\n", argv[1] );
      exit ( EXIT_FAILURE );
   }

   /* alloc memory for the pointer
    *
    * fileinfo.st_size = size of the file in bytes
    */
   fullfile = ( char * ) malloc ( fileinfo.st_size * sizeof ( char ));
   if ( !fullfile )
   {
      printf ( "[*] Can't malloc() %d bytes\n", fileinfo.st_size );
      exit ( EXIT_FAILURE );
   }

   /* To view all the resources of the stat structure:
    *
    * $ man stat
    */
   printf ( "File info:\n" );
   printf ( "UID : %d\n", fileinfo.st_uid );
   printf ( "GID : %d\n", fileinfo.st_gid );
   printf ( "Size: %d bytes\n", fileinfo.st_size );
   printf ( "Mode: %8.8x\n", fileinfo.st_mode );

   /* reference pointer */
   p = fullfile;
   while ( 1 )
   {
      if ( feof ( openfile )) break;
      fscanf ( openfile, "%c", &(*(p++)) );
   }

   /* print file */
   p2 = fullfile;
   while ( fullfile < p ) putchar ( *(fullfile++) );
   
   /* put back in place what you use */
   free ( p2 );
   fclose ( openfile );

   return 0;
}

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