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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2016-xxxx
license		=	bsd



%%	module

#include "dk4conf.h"
#include "dk4types.h"

#include <stdio.h>

#if DK4_HAVE_STDLIB_H
#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define	STDLIB_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_UNISTD_H
#ifndef UNISTD_H_INCLUDED
#include <unistd.h>
#define	UNISTD_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_PROCESS_H
#ifndef PROCESS_H_INCLUDED
#include <process.h>
#define	PROCESS_H_INCLUDED 1
#endif
#endif



/**	Requirements to build this program:
	* Use 8 bit characters, so we can use the directories from dk4inst.c.
	* Signal handling mechanism.
*/
#if	(DK4_CHAR_SIZE == 1) && ((DK4_HAVE_SIGACTION) || (DK4_HAVE_SIGSET))



#if DK4_HAVE_MATH_H
#ifndef MATH_H_INCLUDED
#include <math.h>
#define	MATH_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_ERRNO_H
#ifndef ERRNO_H_INCLUDED
#include <errno.h>
#define	ERRNO_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_SYS_TYPES_H
#ifndef SYS_TYPES_H_INCLUDED
#include <sys/types.h>
#define SYS_TYPES_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_IO_H
#ifndef IO_H_INCLUDED
#include <io.h>
#define	IO_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_FCNTL_H
#ifndef FCNTL_H_INCLUDED
#include <fcntl.h>
#define FCNTL_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_STRING_H
#ifndef	STRING_H_INCLUDED
#include <string.h>
#define	STRING_H_INCLUDED 1
#endif
#endif

#include "dk4inst.h"
#include "dk4mpl.h"
#include "dk4mem.h"
#include "dk4mai8ddu.h"
#include "dk4mai8dus.h"
#include "dk4str8.h"
#include "dk4lprng.h"
#include "dk4opt.h"
#include "dk4sock.h"
#include "dk4vers.h"



$!trace-include



/**	Information from one LPRng accounting line.
*/
typedef struct {
  char		*username;
  char		*queuename;
  char		*jobtitle;
  char		*pagecount;
} lprng_info_t;




/**	Command line options for program.
*/
static	dk4_option_t	options[] = {
  { { dkT('i'),	dkT("interactive"),	DK4_OPT_ARG_NONE },	{ NULL }, 0},
  { { dkT('s'),	dkT("socket"),		DK4_OPT_ARG_STRING },	{ NULL }, 0},
  { { dkT('h'),	dkT("host"),		DK4_OPT_ARG_STRING },	{ NULL }, 0},
  { { dkT('p'),	dkT("port"),		DK4_OPT_ARG_UNSIGNED },	{ NULL }, 0},
  { { dkT('\0'),dkT("help"),		DK4_OPT_ARG_NONE},	{ NULL }, 0},
  { { dkT('\0'),dkT("version"),		DK4_OPT_ARG_NONE},	{ NULL }, 0},
  { { dkT('\0'),dkT("license"),		DK4_OPT_ARG_NONE},	{ NULL }, 0}
};



/**	Help text.
*/
static	const char * const	help_text[] = {
$!text

Print quota daemon client

printqdc [-i] [-s path] | [-h host -p port]

-i			Interactive mode instead of default pipe mode.
--interactive

-s path			Path name for local UNIX domain socket.
--socket=path

-h host			Host name of remote host.
--host=host

-p port			Port number at remote host.
--port=port

--help			Show this help text.
--version		Show version number.
--license		Show license information.

$!end
};



/**	License conditions text.
*/
static	const char * const	license_text[] = {
$!text	preprocessor

This software uses code from the following projects, either directly or as
a library:

dktools		Dirk Krause's tools and libraries.
		See http://dktools.sourceforge.net/ for more information.

DK tools and libraries license
==============================
Copyright (c) 2015-2016, Dirk Krause
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.
* Neither the name of the Dirk Krause nor the names of contributors may be
  used to endorse or promote products derived from this software without
  specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.

IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

$!end
};



/**	Version information.
*/
static	const char	version_text[] = { DKT_VERSION_C8 };



/**	Constant text keywords used by the module.
*/
static	const char * const	pqdc_kw[] = {
$!string-table
#
#	0	Newline
#
\n
#
#	1	Space
#
 
#
#	2	Default job name
#
x@x+1
#
#	3	Default job title
#
Print job
#
#	4
#
-> 
#
#	5 6
#
<- "
"\n
#
#	7 ... 10
#
printqdc: 
ERROR: Port number too large!\n
ERROR: Port number required!\n
ERROR: Host name required!\n
#
#	11 ... 15
#
ERROR: Failed to shut down socket!\n
ERROR: Failed to send data!\n
ERROR: Failed to open connection to accounting system!\n
ERROR: Failed to construct request (would be too long)!\n
ERROR: Incomplete information to construct request!\n
#
#	16 ... 20
#
ERROR: Pagecounter not numeric!\n
ERROR: Too few arguments for request!\n
ERROR: Unknown command keyword!\n
ERROR: Missing arguments!\n
ERROR: Interrupted by signal!\n
#
#	21 ... 22
#
ERROR: Failed to install signal handlers!\n
ERROR: Failed to restore signal handlers!\n
#
#	23
#
ERROR: Failed to initialize socket subsystem!\n
$!end
};



/**	Default socket name.
*/
static	const char	def_sock_name[] = {
  DK4_INST_DIR_VAR "/run/printqd/printqd.sock"
};



/**	Protocol keywords at start of accounting line.
*/
static const char * const	command_names[] = {
$!string-table
#
#	0 ... 5		LPRng
#
jobstart
jobend
start
end
filestart
fileend
#
#	6 ... 11	printqd
#
info
acct-check
acct-start
acct-end
acct-charge
control
$!end
};


/**	Responses from printqd
*/
static const char * const	responses[] = {
$!string-table
ACCEPT
HOLD
REMOVE
$!end
};

/**	Data exchange buffer.
*/
static	char	inbuf[4096];


/**	Copy for inspection.
*/
static	char	cpbuf[sizeof(inbuf)];


/**	Host name for network connection.
*/
static	char	*host_name	= NULL;


/**	Socket file name for local connection.
*/
static	char	*sock_name	= NULL;


/**	Number of options.
*/
static	size_t	szoptions	=	sizeof(options)/sizeof(dk4_option_t);


/**	Normal exit value (when run as pipe).
*/
static	int	exval	=	LPRNG_EXIT_SUCCESS;



/**	Help (1), version (2), license (4).
*/
static	int	hvl	=	0;



/**	Exit value for interactive mode.
*/
static	int	iexval	=	EXIT_FAILURE;


/**	Flag: Interactive mode (-i option).
*/
static	int	intera	=	0;


/**	Flag: EOF was found.
*/
static	int	eof_found	= 0;


/**	Flag: Response already found and processed.
*/
static	int	found_response	= 0;


#ifdef SIGPIPE
/**	Indicator: SIGPIPE signal received.
*/
static
DK4_VOLATILE
dk4_sig_atomic_t	sig_had_pipe	=	0;
#endif


/**	Indicator: SIGINT signal received.
*/
static
DK4_VOLATILE
dk4_sig_atomic_t	sig_had_int	=	0;


/**	Indicator: SIGTERM signal received.
*/
static
DK4_VOLATILE
dk4_sig_atomic_t	sig_had_term	=	0;



/**	Port number for network connection.
*/
static	unsigned short	portno		=	0U;


/**	Pass pointer through.
	Use of this function is recommended by CERT C coding standard
	to avoid optimizing out.
	@param	ptr	Pointer to pass through.
	@return	The ptr argument.
*/
static
DK4_VOLATILE
dk4_sig_atomic_t *
sig_pass_pointer(DK4_VOLATILE dk4_sig_atomic_t *ptr)
{
  return ptr;
}


#ifdef SIGPIPE
/**	Handler for SIGPIPE signal.
	@param	signo	Signal number (always SIGPIPE, ignored).
*/
static
void
sig_handler_pipe(int signo)
{
  *sig_pass_pointer(&sig_had_pipe) = 1;
}
#endif


/**	Handler for SIGINT signal.
	@param	signo	Signal number (always SIGINT, ignored).
*/
static
void
sig_handler_int(int signo)
{
  *sig_pass_pointer(&sig_had_int) = 1;
}


/**	Handler for SIGTERM signal.
	@param	signo	Signal number (always SIGTERM, ignored).
*/
static
void
sig_handler_term(int signo)
{
  *sig_pass_pointer(&sig_had_term) = 1;
}


/**	Read value from volatile atomic type.
	This function is necessary as some compilers mis-optimize
	direct access to volatile variables (at least if you believe
	one of the coding standards).
	@param	ap	Pointer to volatile atomic variable.
	@return	Contents of the variable.
*/
static
dk4_sig_atomic_t
sig_read_atomic(DK4_VOLATILE dk4_sig_atomic_t *ap)
{
  return (*ap);
}


/**	Check whether we can continue or must abort due to signal.
	@param	dopipe	Flag: Check for SIGPIPE too.
	@return	1 if we can continue, 0 otherwise.
*/
static
int
can_continue(void)
{
  int		 back	= 1;
  if (0 != sig_read_atomic(&sig_had_term)) { back = 0; }
  if (0 != sig_read_atomic(&sig_had_int))  { back = 0; }
  return back;
}



/**	Log one-component message to stderr.
	@param	kwind	Index of text in printqdc_kw array.
*/
static
void
log_1(size_t kwind)
{
  if (0 != intera) {
    fputs(pqdc_kw[7], stderr);
    fputs(pqdc_kw[kwind], stderr);
    fflush(stderr);
  }
}


/**	Eat up input to avoid broken pipe in feeder.
*/
static
void
eatup_input(void)
{
  size_t	rdb;
  int		cc	= 1;
  do {
    if (0 != can_continue()) {
      rdb = fread(inbuf, 1, sizeof(inbuf), stdin);
      if (0 == rdb) {
        cc = 0;
      }
    } else {
      cc = -1;
    }
  } while(1 == cc);
}



/**	Process command line arguments.
	@param	argc	Number of command line arguments.
	@param	argv	Command line arguments array.
	@return	1 on success, 0 on error.
*/
static
int
cmd_line_args(int argc, char *argv[])
{
  dkChar	 *filenames[32];
  size_t	  szfilenames = DK4_SIZEOF(filenames,DK4_PDKCHAR);
  int		  back;
  back = dk4opt_process_argv(
    options, szoptions, argc, argv, filenames, &szfilenames,
    1, 0, NULL
  );
  if (1 == back) {
    if (0 != options[4].found) {
      hvl |= 1;
    }
    if (0 != options[5].found) {
      hvl |= 2;
    }
    if (0 != options[6].found) {
      hvl |= 4;
    }
    if (0 != options[0].found) {
      intera = 1;
    }
    if (0 != options[1].found) {
      sock_name = options[1].val.t;
    }
    if (0 != options[2].found) {
      host_name = options[2].val.t;
    }
    if (0 != options[3].found) {
      if ((dk4_um_t)0x0000FFFFUL >= options[3].val.u) {
        portno = (unsigned short)(options[3].val.u);
      } else {
        back = 0;
	/* ERROR: Port number to large! */
	log_1(8);
      }
    }
    if ((NULL != host_name) && (0 == portno)) {
      back = 0;
      /* ERROR: Port number required */
      log_1(9);
    }
    if ((NULL == host_name) && (0 != portno)) {
      back = 0;
      /* ERROR: Host name required */
      log_1(10);
    }
  } else {
    if (0 != options[0].found) {
      (void)dk4opt_process_argv(
        options, szoptions, argc, argv, filenames, &szfilenames,
	1, 1, NULL
      );
    }
  }
  return back;
}



/**	Data exchange with accounting system.
	@param	pres	Flag: Process response, 0=no, 1=acct-check, 2=info.
*/
static
void
process_data(int pres)
{
  const char	*ep;	/* End pointer for text to number conversions */
  char		*ptr;	/* Traverse data line */
  dk4_um_t	 um;	/* Number obtained from text */
  size_t	 sl;	/* Input buffer string length */
  size_t	 wrb;	/* Bytes we still have to write */
  dk4_socket_t	 sock;	/* Connection to accounting/quota daemon */
  int		 res;	/* Operation result */
  int		 cc;	/* Flag: Can continue */
  $? "+ process_data %d", pres
  wrb = sl = strlen(inbuf);
  /* LOG/SHOW: Request */
  if (0 != intera) {					$? ". log at start"
    fputs(pqdc_kw[4], stdout);
    if (0 < sl) {
      fputs(inbuf, stdout);
      if (0 < sl) {
        if ('\n' != inbuf[sl - 1]) {
	  fputc('\n', stdout);
	}
      } else {
        fputc('\n', stdout);
      }
    }
    fflush(stdout);
  }
  if ((0 < sl) && (0 != can_continue())) {		$? ". rq size ok"
    if ((NULL != host_name) && (0 < portno)) {		$? ". network"
      sock = dk4socket_c8_tcp_client_host_port(
        host_name, portno, 0, 0L, 0L, NULL
      );
    } else {						$? ". local"
      sock = dk4socket_c8_unix_client(
        ((NULL != sock_name) ? sock_name : def_sock_name), NULL
      );
    }
    if (INVALID_SOCKET != sock) {			$? ". sock"
      if (0 != can_continue()) {			$? ". can continue"
        res = dk4socket_send(sock, inbuf, &wrb, 0, 0L, 0L, NULL);
        if ((DK4_SOCKET_RESULT_SUCCESS == res) && (wrb == sl)) { $? ". send"
	  if (0 != can_continue()) {			$? ". can continue"
            res = dk4socket_shutdown(sock, DK4_SOCKET_SHUT_WRITE, NULL);
            if (DK4_SOCKET_RESULT_SUCCESS == res) {	$? ". shutdown"
              cc = 1;
              do {
	        if (0 != can_continue()) {		$? ". can continue"
	          wrb = sizeof(inbuf);
	          res = dk4socket_recv(sock, inbuf, &wrb, 0, 0L, 0L, NULL);
	          if ((DK4_SOCKET_RESULT_SUCCESS==res)&&(0 != can_continue())) {
	            if (0 < wrb) {			$? ". data"
	              if (0 != pres) {			$? ". process response"
			if (sizeof(inbuf) > wrb) {
			  inbuf[wrb] = '\0';
			} else {
			  iexval = EXIT_FAILURE;
			  inbuf[sizeof(inbuf)-1] = '\0';
			}
			dk4str8_normalize(inbuf, NULL);
			/* LOG/SHOW: Response */
			if (0 != intera) {
			  fputs(pqdc_kw[5], stdout);
			  fputs(inbuf, stdout);
			  fputs(pqdc_kw[6], stdout);
			  fflush(stdout);
			}
			switch (pres) {
			  case 1: {
			    if (0 == found_response) {
			      switch (dk4str8_array_index(responses,inbuf,0)) {
			        case 1: {
			          exval = LPRNG_EXIT_HOLD;
			        } break;
			        case 2: {
			          exval = LPRNG_EXIT_REMOVE;
			        } break;
			      }
			    }
			    found_response = 1;
			  } break;
			  case 2: {
			    if (0 == found_response) {
			      um = (dk4_um_t)0UL;
			      ep = NULL;
			      ptr = dk4str8_start(inbuf, NULL);
			      if (NULL != ptr) {
			        ptr = dk4str8_next(ptr, NULL);
			        if (NULL != ptr) {
			          ptr = dk4str8_next(ptr, NULL);
			          if (NULL != ptr) {
			            ptr = dk4str8_next(ptr, NULL);
			            if (NULL != ptr) {
			              res = dk4ma_input_c8_dec_dk4_um_t(
			                &um, ptr, &ep, 1, NULL
			              );
			              if (0 == res) {
			                um = (dk4_um_t)0UL;
			              }
			            }
			          }
			        }
			      }
			      if ((dk4_um_t)0UL == um) {
			        exval = LPRNG_EXIT_REMOVE;
			      }
			    }
			    found_response = 1;
			  } break;
			}
		      } else {				$? ". ignore response"
		      }
	            } else {				$? ". 0 bytes response"
	              cc = 0;
	            }
	          } else {				$? "! recv"
	            iexval = EXIT_FAILURE;
	            cc = -1;
	          }
	        } else {				$? "! signal"
	          cc = -1;
	        }
	      } while (1 == cc);
            } else {					$? "! shutdown"
              iexval = EXIT_FAILURE;
              /* ERROR: Failed to shut down socket */
	      log_1(11);
            }
	  } else {					$? "! signal"
	  }
	} else {					$? "! send"
          iexval = EXIT_FAILURE;
          /* ERROR: Sending data failed */
	  log_1(12);
        }
      } else {						$? "! signal"
      }
      dk4socket_close(sock, NULL);
    } else {						$? "! sock"
      iexval = EXIT_FAILURE;
      /* ERROR: Failed to open socket */
      log_1(13);
    }
  } else {						$? "! rq size 0"
  }
  $? "- process_data"
}



/**	Find final quote for current word.
	@param	str	String to find quote in.
	@param	quote	Quote character.
	@return	Pointer to found quote on success, NULL on error.
*/
static
char *
lprng_final_quote(char *str, char quote)
{
  char		*back	= NULL;
  $? "+ lprng_final_quote %c %s", quote, TR_8STR(str)
  while (('\0' != *str) && (NULL == back)) {
    if (quote == *str) {
      *str = '\0';
      back = str;
      back++;
      back = dk4str8_start(back, NULL);
    } else {
      if ('\\' == *str) {
        if ('\0' != str[1]) {
	  dk4str8_cpy_to_left(str, &(str[1]));
	  str++;
	} else {
	  *str = '\0';
	}
      } else {
        str++;
      }
    }
  }
  $? "- lprng_final_quote \"%s\"", TR_8STR(back)
  return back;
}


/**	Find start of next text word in LPRng accounting line.
	@param	str	Current word (remaining text) in accounting line.
	@return	Pointer to next word if found, NULL on error.
*/
static
char *
lprng_next_word(char *str)
{
  char		*back	= NULL;
  $? "+ lprng_next_word \"%s\"", TR_8STR(str)
  switch (*str) {
    case '\'' : {
      back = lprng_final_quote(&(str[1]), '\'');
    } break;
    case '"'  : {
      back = lprng_final_quote(&(str[1]), '"');
    } break;
    default : {
      back = dk4str8_next(str, NULL);
    } break;
  } $? "- lprng_next_word \"%s\"", TR_8STR(back)
  return back;
}



/**	Fill data structure from LPRng accounting line.
	@param	liptr		Structure to fill.
	@param	textline	The text line to use.
	@return	1 on success, 0 on error.
*/
static
int
lprng_info_from_line(lprng_info_t *liptr, char *textline)
{
  char		*next;
  int		 back	= 1;
  $? "+ lprng_info_from_line \"%s\"", TR_8STR(textline)
  DK4_MEMRES(liptr, sizeof(lprng_info_t));
  liptr->username = NULL; liptr->queuename = NULL;
  liptr->jobtitle = NULL; liptr->pagecount = NULL;
  while (NULL != textline) {
    next = lprng_next_word(textline);
    if (('\'' == *textline) || ('"' == *textline)) {
      textline++;
    }
    if ('-' == *textline) {
      textline++;
      switch (*textline) {
        case 'n': {
	  liptr->username = ++textline;
	} break;
	case 'P': {
	  liptr->queuename = ++textline;
	} break;
	case 'J': {
	  liptr->jobtitle = ++textline;
	} break;
	case 'p': {
	  liptr->pagecount = ++textline;
	} break;
      }
    } else {		$? "! not a minus"
#if 0
      /*	2016-02-15	Simply ignore non-option text.
      */
      back = 0;
      /* ERROR: No minus sign */
#endif
    }
    textline = next;
  }
  $? "- lprng_info_from_line %d", back
  return back;
}



/**	Process one line received from LPRng.
	@param	cmd	Index in command names array.
	@param	args	Further arguments in line.
*/
static
void
lprng_line(int cmd, char *args)
{
  lprng_info_t		 li;		/* All relevant components of line */
  const char		*ep	= NULL;	/* End pointer for numeric conversion */
  const	char		*jt;		/* Job title */
  dk4_um_t		 um;		/* Text to number conversion result */
  int			 res;		/* Operation result */
  int			 ok	= 0;	/* Flag: Can process line */
  $? "+ lprng_line %d \"%s\"", cmd, TR_8STR(args)
  if (0 != lprng_info_from_line(&li, args)) {
    switch (cmd) {
      case 0: {
        if ((NULL != li.username) && (NULL != li.queuename)) {
	  if (0 != dk4str8_cpy_s(inbuf,sizeof(inbuf),command_names[7], NULL)) {
	  if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	  if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),li.queuename, NULL)) {
	  if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	  if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),li.username, NULL)) {
	  if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[0], NULL)) {
	    ok = 1;				$? ". new request constructed"
	  }
	  }
	  }
	  }
	  }
	  }
	  if (0 != ok) {
	    process_data(1);
	  } else {				$? "! failed to construct"
	    iexval = EXIT_FAILURE;
	    /* ERROR: Failed to construct request */
	    log_1(14);
	  }
	} else {				$? "! incomplete"
	  iexval = EXIT_FAILURE;
	  /* ERROR: Incomplete information */
	  log_1(15);
	}
      } break;
      default: {
        if ((NULL != li.username) && (NULL != li.queuename)) {
	  if (NULL != li.pagecount) {
	    res = dk4ma_input_c8_dec_dk4_um_t(&um, li.pagecount, &ep, 1, NULL);
	    if (0 != res) {
	      cmd += 4;
	      if(0 !=dk4str8_cpy_s(inbuf,sizeof(inbuf),command_names[cmd],NULL))
	      {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),li.queuename, NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),li.username, NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),li.pagecount, NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[2], NULL)) {
	      if (0 != dk4str8_cat_s(inbuf,sizeof(inbuf),pqdc_kw[1], NULL)) {
	      jt = li.jobtitle;
	      if (NULL == jt) { jt = pqdc_kw[3]; }
	      if (0 != dk4str8_cat_s(inbuf, sizeof(inbuf), jt, NULL)) {
	      if (0 != dk4str8_cat_s(inbuf, sizeof(inbuf), pqdc_kw[0], NULL)) {
	        ok = 1;
	      }
	      }
	      }
	      }
	      }
	      }
	      }
	      }
	      }
	      }
	      }
	      }
	      if (0 != ok) {			$? ". rq constructed"
	        process_data(0);
	      } else {				$? "! failed to construct rq"
	        iexval = EXIT_FAILURE;
	        /* ERROR: Failed to construct request */
		log_1(14);
	      }
	    } else {				$? "! pc not numeric"
	      iexval = EXIT_FAILURE;
	      /* ERROR: Pagecounter not numeric */
	      log_1(16);
	    }
	  } else {				$? "! incomplete rq"
	    iexval = EXIT_FAILURE;
	    /* ERROR: Incomplete information */
	    log_1(15);
	  }
	} else {				$? "! incomplete rq"
	  iexval = EXIT_FAILURE;
	  /* ERROR: Incomplete information */
	  log_1(15);
	}
      } break;
    }
  } else {
    iexval = EXIT_FAILURE;
  }
  $? "- lprng_line"
}



/**	Process one line containing printqd style data.
	@param	args	Arguments text.
	@param	minargs	Minimum required number of arguments.
	@param	num3	Flag: Argument 3 must be unsigned number.
	@param	pres	Flag: Process response.
*/
static
void
printqd_line(char *args, size_t minargs, int num3, int pres)
{
  const char	*ep	= NULL;			/* End of usable data */
  char		*next;				/* Start of arguments */
  dk4_um_t	 um	= (dk4_um_t)0UL;	/* Numeric conversion result */
  size_t 	 i;				/* Current argument index */
  int		 res;				/* Operation result */
  int		 errnum	= 0;			/* Flag: Numeric error */
  $? "+ printqd_line"
  dk4str8_normalize(args, NULL);
  i = 0;		$? ". line = \"%s\"", args
  while(args) {
    i++;
    next = dk4str8_next(args, NULL);
    if ((3 == i) && (0 != num3)) {	$? ". check \"%s\"", args
      res = dk4ma_input_c8_dec_dk4_um_t(&um, args, &ep, 1, NULL);
      if (0 == res) { errnum = 1; }
    }
    args = next;
  } $? ". i=%u   errnum=%d", (unsigned)i, errnum
  if ((i >= minargs) && (0 == errnum)) {
    process_data(pres);
  } else {
    if (i < minargs) {
      /* ERROR: Too few arguments */
      log_1(17);
    }
    if (0 != errnum) {
      /* ERROR: Page counter not numeric */
      log_1(16);
    }
    iexval = EXIT_FAILURE;
  }
  $? "- printqd_line"
}



/**	Process input from stdin.
*/
static
void
process_input(void)
{
  char		*args;		/* Start of arguments after command */
  int		 cc;		/* Flag: Can continue */
  int		 res;		/* Operation result for numeric conversions */
  $? "+ process_input"
  cc = 1;
  do {
    if (0 != can_continue()) {				$? ". can continue"
      if (fgets(inbuf, sizeof(inbuf), stdin)) {		$? ". data"
        dk4str8_cpy_s(cpbuf, sizeof(cpbuf), inbuf, NULL);
	dk4str8_delnl(cpbuf);
	if (NULL != dk4str8_start(cpbuf, NULL)) {
	  if (0 != intera) {				$? ". interactive"
	    fputs(cpbuf, stdout);
	    fputc('\n', stdout);
	    fflush(stdout);
	  }
	  args = dk4str8_next(cpbuf, NULL);
	  if (NULL != args) {				$? ". arguments"
	    res = dk4str8_array_index(command_names, cpbuf, 0);
	    if (0 != can_continue()) {
	      switch (res) {
	        case 0: {
	          lprng_line(res, args);
	        } break;
	        case 1: {
	        } break;
	        case 2: {
	        } break;
	        case 3: {
	        } break;
	        case 4: {
	          lprng_line(res, args);
	        } break;
	        case 5: {
	          lprng_line(res, args);
	        } break;
	        case 6: {
	          printqd_line(args, 2, 0, 2);
	        } break;
	        case 7: {
	          printqd_line(args, 2, 0, 1);
	        } break;
	        case 8: {
	          printqd_line(args, 4, 1, 0);
	        } break;
	        case 9: {
	          printqd_line(args, 4, 1, 0);
	        } break;
	        case 10: {
	          printqd_line(args, 3, 1, 0);
	        } break;
	        case 11: {
	          printqd_line(args, 1, 0, 0);
	        } break;
	        default: {
	          iexval = EXIT_FAILURE;
	          /* ERROR: Unknown keyword */
	          log_1(18);
	        } break;
	      }
	    } else {
	      cc = -1;
	    }
	  } else {				$? "! no arguments"
	    /* ERROR: No arguments */
	    log_1(19);
	    iexval = EXIT_FAILURE;
	  }
	} else {				$? ". skip empty line"
	}
      } else {					$? ". end of data"
        eof_found = 1;
	cc = 0;
      }
    } else {					$? "! aborted"
      cc = -1;
    }
  } while (1 == cc);
  $? "- process_input"
}



/**	Show a text paragraph on standard output.
	@param	txt	Text to show.
*/
static
void
show_text(const char * const *txt)
{
  if (NULL != txt) {
    while (NULL != *txt) {
      fputs(*(txt++), stdout);
      fputc('\n', stdout);
    }
    fflush(stdout);
  }
}



/**	Handle --help, --version, --license options.
*/
static
void
run_hvl(void)
{
  if (0 != (1 & hvl)) {
    show_text(help_text);
  }
  if (0 != (2 & hvl)) {
    fputs(version_text, stdout);
    fputc('\n', stdout);
    fflush(stdout);
  }
  if (0 != (4 & hvl)) {
    show_text(license_text);
  }
}



/**	Main program.
	@param	argc	Number of command line arguments.
	@param	argv	Command line arguments array.
	@return	Exit status code.
*/
int
main(int argc, char *argv[])
{
#ifdef	DK4_HAVE_SIGACTION
#ifdef SIGPIPE
  struct sigaction	opipe;
  struct sigaction	npipe;
#endif
  struct sigaction	oint;
  struct sigaction	nint;
  struct sigaction	oterm;
  struct sigaction	nterm;
#else
#ifdef SIGPIPE
  dk4_sig_handler_t	*opipe	= NULL;
#endif
  dk4_sig_handler_t	*oterm	= NULL;
  dk4_sig_handler_t	*oint	= NULL;
#endif
#ifdef	DK4_HAVE_SIGACTION
#ifdef SIGPIPE
  int			spipe	= 0;
#endif
  int			sint	= 0;
  int			sterm	= 0;
  int			s_f_i	= 0;
  int			s_f_r	= 0;
#endif
  int			socki	= 0;

  /*	Set signal handlers
  */
#if DK4_HAVE_SIGACTION
#ifdef	SIGPIPE
  DK4_MEMRES(&npipe, sizeof(npipe));
  npipe.sa_handler = sig_handler_pipe;
  npipe.sa_flags = 0;
  if (0 != sigemptyset(&npipe.sa_mask)) {
    s_f_i = 1;
    goto finished;
  }
  if (0 != sigaddset(&npipe.sa_mask, SIGPIPE)) {
    s_f_i = 1;
    goto finished;
  }
  if (0 != sigaction(SIGPIPE, &npipe, &opipe)) {
    s_f_i = 1;
    goto finished;
  }
  spipe = 1;
#endif
  DK4_MEMRES(&nterm, sizeof(nterm));
  nterm.sa_handler = sig_handler_term;
  nterm.sa_flags = 0;
  if (0 != sigemptyset(&nterm.sa_mask)) {
    s_f_i = 1;
    goto finished;
  }
  if (0 != sigaddset(&nterm.sa_mask, SIGTERM)) {
    s_f_i = 1;
    goto finished;
  }
  if (0 != sigaction(SIGTERM, &nterm, &oterm)) {
    s_f_i = 1;
    goto finished;
  }
  sterm = 1;
  DK4_MEMRES(&nint, sizeof(nint));
  nint.sa_handler = sig_handler_int;
  nint.sa_flags = 0;
  if (0 != sigemptyset(&nint.sa_mask)) {
    s_f_i = 1;
    goto finished;
  }
  if (0 != sigaddset(&nint.sa_mask, SIGINT)) {
    s_f_i = 1;
    goto finished;
  }
  if (0 != sigaction(SIGINT, &nint, &oint)) {
    s_f_i = 1;
    goto finished;
  }
  sint = 1;
#else
#ifdef	SIGPIPE
  opipe = sigset(SIGPIPE, sig_handler_pipe);
#endif
  oint  = sigset(SIGINT,  sig_handler_int);
  oterm = sigset(SIGTERM, sig_handler_term);
#endif

  /*	Start tracing
  */
  $!trace-init	printqdc.deb
  $? "+ main"

  /*	Process command line arguments
  */
  if (0 == cmd_line_args(argc, argv))	{ goto finished; }

  /*	Help, version, license.
  */
  if (0 != hvl) {
    run_hvl();
    goto finished;
  }

  /*	Bring socket subsystem up.
  */
  if (DK4_SOCKET_RESULT_SUCCESS != dk4socket_up(NULL)) {
    /* ERROR: Failed to initialize socket subsystem */
    log_1(23);
    goto finished;
  }
  socki = 1;

  iexval = EXIT_SUCCESS;
  $? ". comman line arguments processed, going to process input"
  process_input();

  finished:

  /*	Eat up remaining input, if any.
  */
  if ((0 == hvl) && (0 == eof_found)) 		{ eatup_input(); }

  /*	Log notification about abort by signal.
  */
  if (0 == can_continue()) {
    /* LOG: Interrupted by signal */
    log_1(20);
    iexval = EXIT_FAILURE;
  }

  /*	Release socket subsystem.
  */
  if (0 != socki)			{ (void)dk4socket_down(NULL); }

  /*	Restore signal handlers
  */
#if DK4_HAVE_SIGACTION
  if (0 != s_f_i) {
    /* ERROR: Failed to install signal handlers */
    log_1(21);
    iexval = EXIT_FAILURE;
  }
  if (0 != sint) {
  if (0 != sigaction(SIGINT, &oint, NULL)) {
    s_f_r = 1;
  }
  }
  if (0 != sterm) {
  if (0 != sigaction(SIGTERM, &oterm, NULL)) {
    s_f_r = 1;
  }
  }
#ifdef	SIGPIPE
  if (0 != spipe) {
  if (0 != sigaction(SIGPIPE, &opipe, NULL)) {
    s_f_r = 1;
  }
  }
#endif
  if (0 != s_f_r) {
    /* ERROR: Failed to restore signal handlers */
    log_1(22);
    iexval = EXIT_FAILURE;
  }
#else
  if (NULL != oterm) { sigset(SIGTERM, oterm); }
  if (NULL != oint ) { sigset(SIGINT,  oint ); }
#ifdef	SIGPIPE
  if (NULL != opipe) { sigset(SIGPIPE, opipe); }
#endif
#endif

  /*	Set exit status code depending on interactive mode
  */
  if (0 != intera) { exval = iexval; }

  /*	Finish tracing
  */
  $? "- main %d", exval
  $!trace-end

  /*	Exit
  */
  exit(exval); return exval;
}

#else
/* if (DK4_CHAR_SIZE == 1) && ((DK4_HAVE_SIGACTION) || (DK4_HAVE_SIGSET)) */

/**	Main program.
	@param	argc	Number of command line arguments.
	@param	argv	Command line arguments array.
	@return	Exit status code.
*/
int main(int argc, char *argv[])
{
  fputs("printqdc: ERROR: Program can not be used on this system!\n", stderr);
  fflush(stderr);
  exit(EXIT_FAILURE); return EXIT_FAILURE;
}

#endif
/* if (DK4_CHAR_SIZE == 1) && ((DK4_HAVE_SIGACTION) || (DK4_HAVE_SIGSET)) */