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 void
  32 context_read (void)
  33 {
  34     char                        buf[BUFSIZ];    /* path name buffer */
  35     char                        *cp;            /* miscellaneous pointer */
  36     char                        *nd;            /* nmh directory pointer */
  37     struct      stat            st;             /* stat() results */
  38     register    struct  passwd  *pw;            /* getpwuid() results */
  39     register    FILE            *ib;            /* profile and context file pointer */
  40
  41     /*
  42      *  Find user's home directory.  Try the HOME environment variable first,
  43      *  the home directory field in the password file if that's not found.
  44      */
  45
  46     if ((mypath = getenv("HOME")) == (char *)0) {
  47         if ((pw = getpwuid(getuid())) == (struct passwd *)0 || *pw->pw_dir == '\0')
  48             adios(NULL, "cannot determine your home directory");
  49         else
  50             mypath = pw->pw_dir;
  51     }
  52
  53     /*
  54      *  Find and read user's profile.  Check for the existence of an MH environment
  55      *  variable first with non-empty contents.  Convert any relative path name
  56      *  found there to an absolute one.  Look for the profile in the user's home
  57      *  directory if the MH environment variable isn't set.
  58      */
  59
  60     if ((cp = getenv("MH")) && *cp != '\0') {
  61         defpath = path(cp, TFILE);
  62
  63         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  64                 adios((char *)0, "`%s' specified by your MH environment variable is not a normal file", cp);
  65
  66         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  67             adios((char *)0, "unable to read the `%s' profile specified by your MH environment variable", defpath);
  68     }
  69     else {
  70         defpath = concat(mypath, "/", mh_profile, NULL);
  71
  72         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  73             adios((char *)0, "Doesn't look like nmh is installed.  Run install-mh to do so.");
  74
  75         cp = mh_profile;
  76     }
  77
  78     readconfig (&m_defs, ib, cp, 0);
  79     fclose (ib);
  80
  81     /*
  82      *  Find the user's nmh directory, which is specified by the "path" profile component.
  83      *  Convert a relative path name to an absolute one rooted in the home directory.
  84      */
  85
  86     if ((cp = context_find ("path")) == (char *)0)
  87         adios(NULL, "Your %s file does not contain a path entry.", defpath);
  88
  89     if (*cp == '\0')
  90         adios(NULL, "Your `%s' profile file does not contain a valid path entry.", defpath);
  91
  92     if (*cp != '/')
  93         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
  94     else
  95         nd = cp;
  96
  97     if (stat(nd, &st) == -1) {
  98         if (errno != ENOENT)
  99             adios (nd, "error opening");
 100
 101         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 102
 103         if (!getanswer(cp))
 104             adios (NULL, "unable to access MH-directory \"%s\"", nd);
 105
 106         free (cp);
 107
 108         if (!makedir (nd))
 109             adios (NULL, "unable to create", nd);
 110     }
 111
 112     else if ((st.st_mode & S_IFDIR) == 0)
 113         adios ((char *)0, "`%s' is not a directory", nd);
 114
 115     /*
 116      *  Open and read user's context file.  The name of the context file comes from the
 117      *  profile unless overridden by the MHCONTEXT environment variable.
 118      */
 119
 120     if ((cp = getenv ("MHCONTEXT")) == (char *)0 || *cp == '\0')
 121         cp = context;
 122
 123     ctxpath = getcpy (m_maildir (cp));
 124
 125     if ((ib = lkfopen (ctxpath, "r"))) {
 126         readconfig ((struct node **) 0, ib, cp, 1);
 127         lkfclose (ib, ctxpath);
 128     }
 129
 130     return;
 131 }