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tc.sched.c

/* $Header: /src/pub/tcsh/tc.sched.c,v 3.19 2002/03/08 17:36:47 christos Exp $ */
/*
 * tc.sched.c: Scheduled command execution
 *
 * Karl Kleinpaste: Computer Consoles Inc. 1984
 */
/*-
 * Copyright (c) 1980, 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */
#include "sh.h"

RCSID("$Id: tc.sched.c,v 3.19 2002/03/08 17:36:47 christos Exp $")

#include "ed.h"
#include "tw.h"
#include "tc.h"

extern int just_signaled;

struct sched_event {
    struct sched_event *t_next;
    time_t t_when;
    Char  **t_lex;
};
static struct sched_event *sched_ptr = NULL;


time_t
sched_next()
{
    if (sched_ptr)
      return (sched_ptr->t_when);
    return ((time_t) - 1);
}

/*ARGSUSED*/
void
dosched(v, c)
    register Char **v;
    struct command *c;
{
    register struct sched_event *tp, *tp1, *tp2;
    time_t  cur_time;
    int     count, hours, minutes, dif_hour, dif_min;
    Char   *cp;
    bool    relative;         /* time specified as +hh:mm */
    struct tm *ltp;

    USE(c);
/* This is a major kludge because of a gcc linker  */
/* Problem.  It may or may not be needed for you   */
#if defined(_MINIX) && !defined(_MINIX_VMD)
    char kludge[10];
    extern char *sprintf();
    sprintf(kludge, CGETS(24, 1, "kludge"));
#endif /* _MINIX && !_MINIX_VMD */

    v++;
    cp = *v++;
    if (cp == NULL) {
      Char   *fmt;
      if ((fmt = varval(STRsched)) == STRNULL)
          fmt = str2short("%h\t%T\t%R\n");
      /* print list of scheduled events */
      for (count = 1, tp = sched_ptr; tp; count++, tp = tp->t_next) {
          Char buf[BUFSIZE], sbuf[BUFSIZE];
          blkexpand(tp->t_lex, buf);
          tprintf(FMT_SCHED, sbuf, fmt, sizeof(sbuf), 
                short2str(buf), tp->t_when, (ptr_t) &count);
          for (cp = sbuf; *cp;)
            xputchar(*cp++);
      }
      return;
    }

    if (*cp == '-') {
      /* remove item from list */
      if (!sched_ptr)
          stderror(ERR_NOSCHED);
      if (*v)
          stderror(ERR_SCHEDUSAGE);
      count = atoi(short2str(++cp));
      if (count <= 0)
          stderror(ERR_SCHEDUSAGE);
      tp = sched_ptr;
      tp1 = 0;
      while (--count) {
          if (tp->t_next == 0)
            break;
          else {
            tp1 = tp;
            tp = tp->t_next;
          }
      }
      if (count)
          stderror(ERR_SCHEDEV);
      if (tp1 == 0)
          sched_ptr = tp->t_next;
      else
          tp1->t_next = tp->t_next;
      blkfree(tp->t_lex);
      xfree((ptr_t) tp);
      return;
    }

    /* else, add an item to the list */
    if (!*v)
      stderror(ERR_SCHEDCOM);
    relative = 0;
    if (!Isdigit(*cp)) {      /* not abs. time */
      if (*cp != '+')
          stderror(ERR_SCHEDUSAGE);
      cp++, relative++;
    }
    minutes = 0;
    hours = atoi(short2str(cp));
    while (*cp && *cp != ':' && *cp != 'a' && *cp != 'p')
      cp++;
    if (*cp && *cp == ':')
      minutes = atoi(short2str(++cp));
    if ((hours < 0) || (minutes < 0) ||
      (hours > 23) || (minutes > 59))
      stderror(ERR_SCHEDTIME);
    while (*cp && *cp != 'p' && *cp != 'a')
      cp++;
    if (*cp && relative)
      stderror(ERR_SCHEDREL);
    if (*cp == 'p')
      hours += 12;
    (void) time(&cur_time);
    ltp = localtime(&cur_time);
    if (relative) {
      dif_hour = hours;
      dif_min = minutes;
    }
    else {
      if ((dif_hour = hours - ltp->tm_hour) < 0)
          dif_hour += 24;
      if ((dif_min = minutes - ltp->tm_min) < 0) {
          dif_min += 60;
          if ((--dif_hour) < 0)
            dif_hour = 23;
      }
    }
    tp = (struct sched_event *) xcalloc(1, sizeof *tp);
#ifdef _SX
    tp->t_when = cur_time - ltp->tm_sec + dif_hour * 3600 + dif_min * 60;
#else /* _SX */   
    tp->t_when = cur_time - ltp->tm_sec + dif_hour * 3600L + dif_min * 60L;
#endif /* _SX */
    /* use of tm_sec: get to beginning of minute. */
    if (!sched_ptr || tp->t_when < sched_ptr->t_when) {
      tp->t_next = sched_ptr;
      sched_ptr = tp;
    }
    else {
      tp1 = sched_ptr->t_next;
      tp2 = sched_ptr;
      while (tp1 && tp->t_when >= tp1->t_when) {
          tp2 = tp1;
          tp1 = tp1->t_next;
      }
      tp->t_next = tp1;
      tp2->t_next = tp;
    }
    tp->t_lex = saveblk(v);
}

/*
 * Execute scheduled events
 */
/*ARGSUSED*/
void
sched_run(n)
    int n;
{
    time_t   cur_time;
    register struct sched_event *tp, *tp1;
    struct wordent cmd, *nextword, *lastword;
    struct command *t;
    Char  **v, *cp;
    extern Char GettingInput;
#ifdef BSDSIGS
    sigmask_t omask;

    omask = sigblock(sigmask(SIGINT)) & ~sigmask(SIGINT);
#else
    (void) sighold(SIGINT);
#endif

    USE(n);

    (void) time(&cur_time);
    tp = sched_ptr;

    /* bugfix by: Justin Bur at Universite de Montreal */
    /*
     * this test wouldn't be necessary if this routine were not called before
     * each prompt (in sh.c).  But it is, to catch missed alarms.  Someone
     * ought to fix it all up.  -jbb
     */
    if (!(tp && tp->t_when < cur_time)) {
#ifdef BSDSIGS
      (void) sigsetmask(omask);
#else
      (void) sigrelse(SIGINT);
#endif
      return;
    }

    if (GettingInput)
      (void) Cookedmode();

    while (tp && tp->t_when < cur_time) {
      if (seterr) {
          xfree((ptr_t) seterr);
          seterr = NULL;
      }
      cmd.word = STRNULL;
      lastword = &cmd;
      v = tp->t_lex;
      for (cp = *v; cp; cp = *++v) {
          nextword = (struct wordent *) xcalloc(1, sizeof cmd);
          nextword->word = Strsave(cp);
          lastword->next = nextword;
          nextword->prev = lastword;
          lastword = nextword;
      }
      lastword->next = &cmd;
      cmd.prev = lastword;
      tp1 = tp;
      sched_ptr = tp = tp1->t_next; /* looping termination cond: */
      blkfree(tp1->t_lex);    /* straighten out in case of */
      xfree((ptr_t) tp1);     /* command blow-up. */

      /* expand aliases like process() does. */
      alias(&cmd);
      /* build a syntax tree for the command. */
      t = syntax(cmd.next, &cmd, 0);
      if (seterr)
          stderror(ERR_OLD);
      /* execute the parse tree. */
      execute(t, -1, NULL, NULL, TRUE);
      /* done. free the lex list and parse tree. */
      freelex(&cmd), freesyn(t);
    }
    if (GettingInput && !just_signaled) { /* PWP */
      (void) Rawmode();
      ClearLines();           /* do a real refresh since something may */
      ClearDisp();            /* have printed to the screen */
      Refresh();
    }
    just_signaled = 0;

#ifdef BSDSIGS
    (void) sigsetmask(omask);
#else
    (void) sigrelse(SIGINT);
#endif
}

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