mbx_default.c

shortcut for getenv(MAIL) etc ... to get the default mailbox.
And could serve as a hook to Jeff/Jakob idea of config file.

+#include <mailbox.h>
+#include <string.h>
+#include <stdlib.h>
+#include <paths.h>
+#include <errno.h>
+#include <stdio.h>
+
+#ifndef _PATH_MAILDIR
+# define _PATH_MAILDIR "/var/spool/mail"
+#endif
+
+int
+mailbox_create_default (mailbox_t *pmbox, const char *mail)
+{
+  const char *user = NULL;
+
+  if (pmbox == NULL)
+    return EINVAL;
+
+  if (mail == NULL)
+    mail = getenv ("MAIL");
+
+  if (mail)
+    {
+      /* is it a fullpath ? */
+      if (mail[0] != '/')
+	{
+	  /* is it a URL ? */
+	  if (strchr (mail, ':') == NULL)
+	    {
+	      /* a user name */
+	      user = mail;
+	      mail = NULL;
+	    }
+	}
+    }
+
+  if (mail == NULL)
+    {
+      int status;
+      char *mail0;
+      if (user == NULL)
+	{
+	  user = (getenv ("LOGNAME")) ? getenv ("LOGNAME") : getenv ("USER");
+	  if (user == NULL)
+	    {
+	      fprintf (stderr, "who am I?\n");
+	      return EINVAL;
+	    }
+	}
+      mail0 = malloc (strlen (user) + strlen (_PATH_MAILDIR) + 2);
+      if (mail0 == NULL)
+	return ENOMEM;
+      sprintf (mail0, "%s/%s", _PATH_MAILDIR, user);
+      status = mailbox_create (pmbox, mail0, 0);
+      free (mail0);
+      return status;
+    }
+  return  mailbox_create (pmbox, mail, 0);
+}