#include <sys/types.h>

#include <sys/stat.h>

#include <utmp.h>

#ifndef UTMP_FILE

#ifdef _PATH_UTMP

#define UTMP_FILE _PATH_UTMP

#else

#define UTMP_FILE "/etc/utmp"

#endif

#endif

#include "readwrite.h"

#include "stralloc.h"

#include "substdio.h"

#include "subfd.h"

#include "open.h"

#include "byte.h"

#include "str.h"

#include "headerbody.h"

#include "hfield.h"

#include "env.h"

#include "exit.h"

substdio ssutmp;

char bufutmp[sizeof(struct utmp) * 16];

int fdutmp;

substdio sstty;

char buftty[1024];

int fdtty;

struct utmp ut;

char line[sizeof(ut.ut_line) + 1];

stralloc woof = {0};

stralloc tofrom = {0};

stralloc text = {0};

void doit(s,n) char *s; int n;

{

 if (!stralloc_catb(&text,s,n)) _exit(0);

 if (text.len > 78) text.len = 78;

}

void dobody(h) stralloc *h; { doit(h->s,h->len); }

void doheader(h) stralloc *h;

{

 int i;

 if (hfield_known(h->s,h->len) == H_SUBJECT)

  {

   i = hfield_skipname(h->s,h->len);

   doit(h->s + i,h->len - i);

  }

}

void finishheader() { ; }

void main()

{

 char *user;

 char *sender;

 char *userext;

 struct stat st;

 int i;

 if (chdir("/dev") == -1) _exit(0);

 if (!(user = env_get("USER"))) _exit(0);

 if (!(sender = env_get("SENDER"))) _exit(0);

 if (!(userext = env_get("LOCAL"))) _exit(0);

 if (str_len(user) > sizeof(ut.ut_name)) _exit(0);

 if (!stralloc_copys(&tofrom,"*** TO <")) _exit(0);

 if (!stralloc_cats(&tofrom,userext)) _exit(0);

 if (!stralloc_cats(&tofrom,"> FROM <")) _exit(0);

 if (!stralloc_cats(&tofrom,sender)) _exit(0);

 if (!stralloc_cats(&tofrom,">")) _exit(0);

 for (i = 0;i < tofrom.len;++i)

   if ((tofrom.s[i] < 32) || (tofrom.s[i] > 126))

     tofrom.s[i] = '_';

 if (!stralloc_copys(&text,"    ")) _exit(0);

 if (headerbody(subfdin,doheader,finishheader,dobody) == -1) _exit(0);

 for (i = 0;i < text.len;++i)

   if ((text.s[i] < 32) || (text.s[i] > 126))

     text.s[i] = '/';

 if (!stralloc_copys(&woof,"\015\n\007")) _exit(0);

 if (!stralloc_cat(&woof,&tofrom)) _exit(0);

 if (!stralloc_cats(&woof,"\015\n")) _exit(0);

 if (!stralloc_cat(&woof,&text)) _exit(0);

 if (!stralloc_cats(&woof,"\015\n")) _exit(0);

 fdutmp = open_read(UTMP_FILE);

 if (fdutmp == -1) _exit(0);

 substdio_fdbuf(&ssutmp,read,fdutmp,bufutmp,sizeof(bufutmp));

 while (substdio_get(&ssutmp,&ut,sizeof(ut)) == sizeof(ut))

   if (!str_diffn(ut.ut_name,user,sizeof(ut.ut_name)))

    {

     byte_copy(line,sizeof(ut.ut_line),ut.ut_line);

     line[sizeof(ut.ut_line)] = 0;

     if (line[0] == '/') continue;

     if (!line[0]) continue;

     if (line[str_chr(line,'.')]) continue;

     fdtty = open_append(line);

     if (fdtty == -1) continue;

     if (fstat(fdtty,&st) == -1) { close(fdtty); continue; }

     if (!(st.st_mode & 0100)) { close(fdtty); continue; }

     if (st.st_uid != getuid()) { close(fdtty); continue; }

     substdio_fdbuf(&sstty,write,fdtty,buftty,sizeof(buftty));

     substdio_putflush(&sstty,woof.s,woof.len);

     close(fdtty);

    }

 _exit(0);

}