whom.c: Don't call rename(2) with source that's uninitialised.

The intent is that two rename(2)s take place: to move a file to a
backup and then return it.  The first test controlled the generation of
the destination in the char array `backup' and calling the first
rename().  The second test used that same array for the restoring
rename(), but used a different test and so could run when the first
rename hadn't, and with an uninitialised array for the source filename.

The initialisation of `backup' and the first rename needed both
environment variables `mhdist' and `mhaltmsg' to be non-empty, and the
former to have a non-zero atoi(3) value.  The second rename ignored
`mhaltmsg'.  Bug pre-dates git.

diff --git a/uip/whom.c b/uip/whom.c
index f0eee7e..00af980 100644 (file)
--- a/uip/whom.c
+++ b/uip/whom.c
@@ -59,7 +59,8 @@ main (int argc, char **argv)
 {
     pid_t child_id = OK;
     int status, isdf = 0;
-    int distsw = 0, vecp = 0;
+    int vecp = 0;
+    bool distsw;
     char *cp, *dfolder = NULL, *dmsg = NULL;
     char *msg = NULL, **ap, **argp, backup[BUFSIZ];
     char buf[BUFSIZ], **arguments, *vec[MAXARGS];
@@ -166,11 +167,10 @@ main (int argc, char **argv)
            cp  = getcpy (m_draft (dfolder, dmsg, 1, &isdf));
        msg = vec[vecp++] = cp;
     }
-    if ((cp = getenv ("mhdist"))
-           && *cp
-           && (distsw = atoi (cp))
-           && (cp = getenv ("mhaltmsg"))
-           && *cp) {
+
+    distsw = (cp = getenv("mhdist")) && *cp && atoi(cp) &&
+        (cp = getenv("mhaltmsg")) && *cp;
+    if (distsw) {
        if (distout (msg, cp, backup) == NOTOK)
            done (1);
        vec[vecp++] = "-dist";