File: wall.c

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sysvinit 2.75-3
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/*
 * wall.c	Write to all users logged in.
 *
 * Usage:	wall [text]
 *
 * Version:	@(#)wall  2.73  25-Nov-1997  MvS
 *
 *		This file is part of the sysvinit suite,
 *		Copyright 1991-1997 Miquel van Smoorenburg.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

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

char *Version = "@(#) wall 2.73 25-Nov-1997 MvS";
#define MAXLEN 4096

extern void wall(char *, int, int);

int main(int argc, char **argv)
{
  char buf[MAXLEN];
  char line[83];
  int f, ch;
  int len = 0;
  int remote = 0;
  char *p;

  buf[0] = 0;

  while((ch = getopt(argc, argv, "n")) != EOF)
	switch(ch) {
		case 'n':
			/*
			 *	Undocumented option for suppressing
			 *	banner from rpc.rwalld.
			 */
			remote = 1;
			break;
		default:
			fprintf(stderr, "usage: wall [message]\n");
			return 1;
			break;
	}

  if ((argc - optind) > 0) {
	for(f = optind; f < argc; f++) {
  		len += strlen(argv[f]) + 1;
  		if (len >= MAXLEN) break;
  		strcat(buf, argv[f]);
  		strcat(buf, " ");
  	}
  	strcat(buf, "\r\n");
  } else {
  	while(fgets(line, 80, stdin)) {
  		/*
		 *	Make sure that line ends in \r\n
		 */
  		for(p = line; *p && *p != '\n'; p++)
  			;
  		strcpy(p, "\r\n");
  		len += strlen(line);
  		if (len >= MAXLEN) break;
  		strcat(buf, line);
  	}
  }

  wall(buf, 0, remote);

  return 0;
}