diplodocus.org Git - nmh/blob - sbr/context_read.c

   1 /*
   2  * context_read.c -- find and read profile and context files
   3  *
   4  * $Id$
   5  *
   6  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   7  * COPYRIGHT file in the root directory of the nmh distribution for
   8  * complete copyright information.
   9  *
  10  *      This function must be called early on in any nmh utility, and
  11  *      may only be called once.  It does the following:
  12  *
  13  *       o  Sets the global variable "mypath" to the home directory path.
  14  *
  15  *       o  Sets the global variable "defpath" to the absolute path of
  16  *          the profile file.
  17  *
  18  *       o  Reads in the profile file.  Bails out if it can't.
  19  *
  20  *       o  Makes sure that the mail directory exists, prompting for
  21  *          creation if it doesn't.
  22  *
  23  *       o  Reads the context file either as set by the MHCONTEXT
  24  *          environment variable or by the profile.
  25  */
  26
  27 #include <h/mh.h>                               /* mh internals */
  28 #include <errno.h>                              /* system call errors */
  29 #include <pwd.h>                                /* structure for getpwuid() results */
  30
  31 extern  int     errno;                          /* system call error number */
  32
  33 void
  34 context_read (void)
  35 {
  36     char                        buf[BUFSIZ];    /* path name buffer */
  37     char                        *cp;            /* miscellaneous pointer */
  38     char                        *nd;            /* nmh directory pointer */
  39     struct      stat            st;             /* stat() results */
  40     register    struct  passwd  *pw;            /* getpwuid() results */
  41     register    FILE            *ib;            /* profile and context file pointer */
  42
  43     /*
  44      *  Find user's home directory.  Try the HOME environment variable first,
  45      *  the home directory field in the password file if that's not found.
  46      */
  47
  48     if ((mypath = getenv("HOME")) == (char *)0) {
  49         if ((pw = getpwuid(getuid())) == (struct passwd *)0 || *pw->pw_dir == '\0')
  50             adios(NULL, "cannot determine your home directory");
  51         else
  52             mypath = pw->pw_dir;
  53     }
  54
  55     /*
  56      *  Find and read user's profile.  Check for the existence of an MH environment
  57      *  variable first with non-empty contents.  Convert any relative path name
  58      *  found there to an absolute one.  Look for the profile in the user's home
  59      *  directory if the MH environment variable isn't set.
  60      */
  61
  62     if ((cp = getenv("MH")) && *cp != '\0') {
  63         defpath = path(cp, TFILE);
  64
  65         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  66                 adios((char *)0, "`%s' specified by your MH environment variable is not a normal file", cp);
  67
  68         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  69             adios((char *)0, "unable to read the `%s' profile specified by your MH environment variable", defpath);
  70     }
  71     else {
  72         defpath = concat(mypath, "/", mh_profile, NULL);
  73
  74         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  75             adios((char *)0, "Doesn't look like nmh is installed.  Run install-mh to do so.");
  76
  77         cp = mh_profile;
  78     }
  79
  80     readconfig (&m_defs, ib, cp, 0);
  81     fclose (ib);
  82
  83     /*
  84      *  Find the user's nmh directory, which is specified by the "path" profile component.
  85      *  Convert a relative path name to an absolute one rooted in the home directory.
  86      */
  87
  88     if ((cp = context_find ("path")) == (char *)0)
  89         adios(NULL, "Your %s file does not contain a path entry.", defpath);
  90
  91     if (*cp == '\0')
  92         adios(NULL, "Your `%s' profile file does not contain a valid path entry.", defpath);
  93
  94     if (*cp != '/')
  95         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
  96     else
  97         nd = cp;
  98
  99     if (stat(nd, &st) == -1) {
 100         if (errno != ENOENT)
 101             adios (nd, "error opening");
 102
 103         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 104
 105         if (!getanswer(cp))
 106             adios (NULL, "unable to access MH-directory \"%s\"", nd);
 107
 108         free (cp);
 109
 110         if (!makedir (nd))
 111             adios (NULL, "unable to create", nd);
 112     }
 113
 114     else if ((st.st_mode & S_IFDIR) == 0)
 115         adios ((char *)0, "`%s' is not a directory", nd);
 116
 117     /*
 118      *  Open and read user's context file.  The name of the context file comes from the
 119      *  profile unless overridden by the MHCONTEXT environment variable.
 120      */
 121
 122     if ((cp = getenv ("MHCONTEXT")) == (char *)0 || *cp == '\0')
 123         cp = context;
 124
 125     ctxpath = getcpy (m_maildir (cp));
 126
 127     if ((ib = lkfopen (ctxpath, "r"))) {
 128         readconfig ((struct node **) 0, ib, cp, 1);
 129         lkfclose (ib, ctxpath);
 130     }
 131
 132     return;
 133 }