proc/devname.c: Never write more than "chop" (part 2).

"chop" is the maximum offset where the null-byte should be written;
respect this even if about to write just one (non-null) character.

diff --git a/proc/devname.c b/proc/devname.c
index 08ed131d88d960e3a923e2513589a7af72ebebfa..368548a959ba394ed5d092056240e76e6d39e808 100644 (file)
--- a/proc/devname.c
+++ b/proc/devname.c
@@ -341,7 +341,7 @@ unsigned dev_to_tty(char *restrict ret, unsigned chop, dev_t dev_t_dev, int pid,
   if(  link_name(tmp, MAJOR_OF(dev), MINOR_OF(dev), pid, "fd/255")) goto abbrev;
   // fall through if unable to find a device file
 no_tty:
-  strcpy(ret, "?");
+  strcpy(ret, chop >= 1 ? "?" : "");
   return 1;
 abbrev:
   if((flags&ABBREV_DEV) && !strncmp(tmp,"/dev/",5) && tmp[5]) tmp += 5;