bin/sh/mail.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)mail.c      8.2 (Berkeley) 5/4/95";
  36 #endif
  37 #endif /* not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD: head/bin/sh/mail.c 336303 2018-07-15 09:14:30Z jilles $");
  40
  41 /*
  42  * Routines to check for mail.  (Perhaps make part of main.c?)
  43  */
  44
  45 #include "shell.h"
  46 #include "mail.h"
  47 #include "var.h"
  48 #include "output.h"
  49 #include "memalloc.h"
  50 #include "error.h"
  51 #include <sys/types.h>
  52 #include <sys/stat.h>
  53 #include <stdlib.h>
  54
  55
  56 #define MAXMBOXES 10
  57
  58
  59 static int nmboxes;                     /* number of mailboxes */
  60 static time_t mailtime[MAXMBOXES];      /* times of mailboxes */
  61
  62
  63
  64 /*
  65  * Print appropriate message(s) if mail has arrived.  If the argument is
  66  * nozero, then the value of MAIL has changed, so we just update the
  67  * values.
  68  */
  69
  70 void
  71 chkmail(int silent)
  72 {
  73         int i;
  74         char *mpath;
  75         char *p;
  76         char *msg;
  77         struct stackmark smark;
  78         struct stat statb;
  79
  80         if (silent)
  81                 nmboxes = 10;
  82         if (nmboxes == 0)
  83                 return;
  84         setstackmark(&smark);
  85         mpath = stsavestr(mpathset()? mpathval() : mailval());
  86         for (i = 0 ; i < nmboxes ; i++) {
  87                 p = mpath;
  88                 if (*p == '\0')
  89                         break;
  90                 mpath = strchrnul(mpath, ':');
  91                 if (*mpath != '\0') {
  92                         *mpath++ = '\0';
  93                         if (p == mpath - 1)
  94                                 continue;
  95                 }
  96                 msg = strchr(p, '%');
  97                 if (msg != NULL)
  98                         *msg++ = '\0';
  99 #ifdef notdef /* this is what the System V shell claims to do (it lies) */
 100                 if (stat(p, &statb) < 0)
 101                         statb.st_mtime = 0;
 102                 if (statb.st_mtime > mailtime[i] && ! silent) {
 103                         out2str(msg? msg : "you have mail");
 104                         out2c('\n');
 105                 }
 106                 mailtime[i] = statb.st_mtime;
 107 #else /* this is what it should do */
 108                 if (stat(p, &statb) < 0)
 109                         statb.st_size = 0;
 110                 if (statb.st_size > mailtime[i] && ! silent) {
 111                         out2str(msg? msg : "you have mail");
 112                         out2c('\n');
 113                 }
 114                 mailtime[i] = statb.st_size;
 115 #endif
 116         }
 117         nmboxes = i;
 118         popstackmark(&smark);
 119 }