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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2001-xxxx
SPDX-License-Identifier:	BSD-3-Clause


%%	module



/**	@file	addctrld.c	Ensure to have CTRL-D as last byte.

This program is a filter. If the final byte in the input stream
is not a CTRL-D the program appends a CTRL-D.
*/

#include "dk4conf.h"


#if DK4_HAVE_UNISTD_H
#include <unistd.h>
#endif

#if DK4_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include <stdio.h>

#if DK4_HAVE_IO_H
#include <io.h>
#endif

#if DK4_HAVE_STDLIB_H
#include <stdlib.h>
#endif

#if DK4_HAVE_PROCESS_H
#include <process.h>
#endif


$(trace-include)



#if !DK4_HAVE_SSIZE_T
#ifdef DK4_HAVE_SSIZE_T
#undef DK4_HAVE_SSIZE_T
#endif
/**	Data type for read/write operation result.
*/
typedef size_t ssize_t;

/**	Flag: ssize_t defined.
*/
#define DK4_HAVE_SSIZE_T 1
#endif



/**	Length of output buffer in bytes.
*/
#define BUFFER_SIZE 4096


/**	Output buffer.
*/
static char outbuffer[BUFFER_SIZE];


/**	Number of bytes currently used in output buffer.
*/
static size_t outbused;



/**	Flush output buffer.
*/
static void flush_buffer(void)
{
  if(outbused > 0) {
#if DK4_ON_WINDOWS
    (void)_write(1, (void *)outbuffer, (unsigned int)outbused);
#else
#if DK4_HAVE_WRITE
    if (((size_t)write(1, (void *)outbuffer, outbused)) != outbused) {
      /* Intentionally empty */
    }
#else
#if DK4_HAVE__WRITE
    if (((size_t)_write(1, (void *)outbuffer, outbused)) != outbused) {
      /* Intentionally empty */
    }
#else
#error	"No write() function"
#endif
#endif
#endif
  }
  outbused = 0;
}



/**	Add one character to output buffer, flush if buffer is full.
	@param	c	Character to add.
*/
static void add_char(char c)
{
  outbuffer[outbused++] = c;
  if(outbused == sizeof(outbuffer)) {
    flush_buffer();
    outbused = 0;
  }
}



/**	The main() function of the addctrld program.
	@return	0 on success, other values indicate errors.
*/
int main(void)
{
  char inbuffer[sizeof(outbuffer)];
  char *ptr;
  int ende; ssize_t lgt; int have_ctrld;

  outbused = 0; ende = 0; have_ctrld = 0;
  while(ende == 0) {
#if DK4_ON_WINDOWS
    lgt = _read(0, inbuffer, sizeof(inbuffer));
#else
#if DK4_HAVE_READ
    lgt = read(0, inbuffer, sizeof(inbuffer));
#else
#if DK4_HAVE__READ
    lgt = _read(0, inbuffer, sizeof(inbuffer));
#else
#error	"No read() function!"
#endif
#endif
#endif
    if(lgt > 0) {
      ptr = inbuffer;
      while(lgt--) {
	if(*ptr == 0x04) have_ctrld = 1;
	else             have_ctrld = 0;
	add_char(*(ptr++));
      }
    } else {
      ende = 1;
    }
  }
  if(!have_ctrld) add_char(0x04);
  flush_buffer();
  fflush(stdout);
  exit(0); return 0;
}