gno/usr.bin/write/write.c

145 lines
3.6 KiB
C
Raw Normal View History

/* write.cc - UNIX-like write utility. Send message to terminal. */
/* Copyright 1993, 1994 by Leslie M. Barstow III */
/* This program is Freeware: Distribute and modify as you like, but
please retain original Copyright in source, program, and manpage. */
/* v1.0 - original release */
/* v1.1 - 2/2/94 updated for new Multi-User package using wtmp */
/* v2.0 - 2/21/94 fixed several bugs, added date to message. */
/* v2.1 - 3/8/94 changed errors to stderr, fixed some errors, added TZ.
changes taken in part from Phil Vandry's sample code -
Thanks, Phil :-) */
#pragma optimize -1
#pragma debug 0
#pragma stacksize 768
#define O_WRONLY 0x0002
#include <time.h>
#include <types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <orca.h>
#include <utmp.h>
#include <fcntl.h>
#include <pwd.h>
#include <unistd.h>
#include <texttool.h>
#include <sys/ioctl.h>
void Usage(void)
{fputs("usage: write username [message]\n",stdout);
fputs("GS write v2.1: Copyright 1994 by Leslie M. Barstow III.\n", stdout);
}
int userTTY(char *user, int **list)
{int fd, tmp;
static struct utmp uentry;
static char tmpline[UT_LINESIZE+1];
int count = 0;
int *newlist;
fd=open(_PATH_UTMP, 257);
if (fd < 1)
{fputs("write - unable to retrieve current users.\n", stderr);
exit(-1);
}
do
{tmp = read(fd, (void *)(&uentry), sizeof(uentry));
if (tmp && uentry.ut_type && !(uentry.ut_type & UT_INVISIBLE))
{if (!strncmp(uentry.ut_name,user,UT_NAMESIZE))
{count++;
newlist = (int *)realloc(*list, count *2);
if (newlist == (int *)0L)
{for (tmp = 1; tmp < count; tmp++)
close((*list)[tmp-1]);
free(*list);
close(fd);
fputs("write - unable to allocate memory.\n", stderr);
exit(-1);
}
*list = newlist;
(*list)[count-1] = open(uentry.ut_line, 0x0002);
if ((*list)[count-1] < 1)
{fputs("write - unable to open terminal ",stderr);
strncpy(tmpline, uentry.ut_line, UT_LINESIZE);
tmpline[UT_LINESIZE] = '\0';
fputs(tmpline, stderr);
fputs(".\n", stderr);
count--;
}
}
}
}
while (tmp);
close(fd);
return(count);
}
int main(int argc, char **argv)
{int count;
int i;
int j = 2;
time_t Time;
char *cTime;
char *uname;
int *fdlist = (int *)0L;
uid_t uid;
int doEcho;
struct passwd *pwent;
static char line [512];
if ((argc < 2) || (argc > 3) || (argv[1][0] == '-'))
{Usage();
exit(-1);
}
uid = getuid();
pwent = getpwuid(uid);
uname = pwent->pw_name;
Time = time(0L);
cTime = ctime(&Time);
count = userTTY(argv[1], &fdlist);
if (count < 1)
{fputs("write - no active terminals for user.\n", stderr);
exit(-1);
}
for (i = 0; i < count; i++)
{write(fdlist[i], "\r\aMessage from ", 15);
write(fdlist[i], uname, strlen(uname));
write(fdlist[i], " at ", 4);
write(fdlist[i], cTime, strlen(cTime));
write(fdlist[i], "\r", 1);
}
/* message on command line - write it and exit */
if (argc == 3)
{for (i = 0; i < count; i++)
{write(fdlist[i], argv[2], strlen(argv[2]));
write(fdlist[i], "\r", 1);
close(fdlist[i]);
}
exit(0);
}
/* No message on command line - read from stdin */
while (j = ReadLine(line, 512, '\r', 0))
{for (i = 0; i< count; i++)
{write(fdlist[i], line, j);
write(fdlist[i], "\r", 1);
}
}
for (i = 0; i < count; i++)
write(fdlist[i], "\r<EOT>\r", 7);
free(line);
for (i = 0; i < count; i++)
close(fdlist[i]);
exit(0);
}