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("$FreeBSD$");
  40
  41 /*
  42  * Routines to check for mail.  (Perhaps make part of main.c?)
  43  */
  44
  45 #include "shell.h"
  46 #include "exec.h"       /* defines padvance() */
  47 #include "mail.h"
  48 #include "var.h"
  49 #include "output.h"
  50 #include "memalloc.h"
  51 #include "error.h"
  52 #include <sys/types.h>
  53 #include <sys/stat.h>
  54 #include <stdlib.h>
  55
  56
  57 #define MAXMBOXES 10
  58
  59
  60 static int nmboxes;                     /* number of mailboxes */
  61 static time_t mailtime[MAXMBOXES];      /* times of mailboxes */
  62
  63
  64
  65 /*
  66  * Print appropriate message(s) if mail has arrived.  If the argument is
  67  * nozero, then the value of MAIL has changed, so we just update the
  68  * values.
  69  */
  70
  71 void
  72 chkmail(int silent)
  73 {
  74         int i;
  75         const char *mpath;
  76         char *p;
  77         char *q;
  78         struct stackmark smark;
  79         struct stat statb;
  80
  81         if (silent)
  82                 nmboxes = 10;
  83         if (nmboxes == 0)
  84                 return;
  85         setstackmark(&smark);
  86         mpath = mpathset()? mpathval() : mailval();
  87         for (i = 0 ; i < nmboxes ; i++) {
  88                 p = padvance(&mpath, "");
  89                 if (p == NULL)
  90                         break;
  91                 if (*p == '\0')
  92                         continue;
  93                 for (q = p ; *q ; q++);
  94                 if (q[-1] != '/')
  95                         abort();
  96                 q[-1] = '\0';                   /* delete trailing '/' */
  97 #ifdef notdef /* this is what the System V shell claims to do (it lies) */
  98                 if (stat(p, &statb) < 0)
  99                         statb.st_mtime = 0;
 100                 if (statb.st_mtime > mailtime[i] && ! silent) {
 101                         out2str(pathopt? pathopt : "you have mail");
 102                         out2c('\n');
 103                 }
 104                 mailtime[i] = statb.st_mtime;
 105 #else /* this is what it should do */
 106                 if (stat(p, &statb) < 0)
 107                         statb.st_size = 0;
 108                 if (statb.st_size > mailtime[i] && ! silent) {
 109                         out2str(pathopt? pathopt : "you have mail");
 110                         out2c('\n');
 111                 }
 112                 mailtime[i] = statb.st_size;
 113 #endif
 114         }
 115         nmboxes = i;
 116         popstackmark(&smark);
 117 }