/*
  ncat.c: Named cat - display multiple files with their filenames.

  Jason Hood, 2 January, 1999.
  Public Domain.

  991111: slight modifications.

  031013, v1.00:
    and again.
*/

#define PVERS "1.00"
#define PDATE "13 October, 2003"


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

#ifdef __DJGPP__		// Location of isatty
# include <unistd.h>
#else
# include <io.h>
#endif


void help( void )
{
  puts( "\
Named Cat by Jason Hood <jadoxa@yahoo.com.au>.\n\
Version "PVERS" ("PDATE"). Public Domain.\n\
http://misc.adoxa.cjb.net/\n\
\n\
Combine multiple files to standard output, along with their filenames.\n\
Use a filename of \"-\" to specify standard input (if not given it will\n\
be read first).\
" );

  exit( 0 );
}


int main( int argc, char* argv[] )
{
  FILE* file;
  char	buf[2048];
  int	len;
  int	input;
  int	j;

  if ((argc == 1 && isatty( 0 )) ||
      (argc > 1 && (strcmp( argv[1], "/?" ) == 0 ||
		    strcmp( argv[1], "-?" ) == 0 ||
		    strcmp( argv[1], "--help" ) == 0)))
    help();

  // If input has been redirected, see if "-" has been given.
  if (!isatty( 0 ))
  {
    input = 0;
    for (j = 1; j < argc; ++j)
    {
      if (argv[j][0] == '-' && argv[j][1] == '\0')
      {
	input = 1;
	break;
      }
    }
    j = input;
  }
  else
    j = 1;

  for (; j < argc; ++j)
  {
    input = (j == 0 || (argv[j][0] == '-' && argv[j][1] == '\0'));

    printf( "==> %s <==\n", (input) ? "<stdin>" : argv[j] );

    if (input)
      file = stdin;
    else if ((file = fopen( argv[j], "r" )) == NULL)
    {
      printf( " could not be opened.\n" );
      continue;
    }
    putchar( '\n' );

    while ((len = fread( buf, 1, sizeof(buf), file )) > 0)
      fwrite( buf, 1, len, stdout );

    if (!input)
      fclose( file );

    if (j < argc - 1)
      putchar( '\n' );
  }

  return 0;
}