From 09d95477765d3941aacb61c97f76ee94301b8faa Mon Sep 17 00:00:00 2001
From: Elliott Hughes <enh@google.com>
Date: Fri, 12 Feb 2016 08:13:06 -0800
Subject: Fix wc -c optimization.

Check the fstat(2) return value rather than read uninitialized memory if
it failed, and add a special case for files that claim to be zero-length
but aren't (as is common in /proc on Linux).
---
 toys/posix/wc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'toys/posix/wc.c')

diff --git a/toys/posix/wc.c b/toys/posix/wc.c
index 62d1f7a0..e7afc813 100644
--- a/toys/posix/wc.c
+++ b/toys/posix/wc.c
@@ -53,8 +53,8 @@ static void do_wc(int fd, char *name)
   if (toys.optflags == FLAG_c) {
     struct stat st;
 
-    fstat(fd, &st);
-    if (S_ISREG(st.st_mode)) {
+    // On Linux, files in /proc often report their size as 0.
+    if (!fstat(fd, &st) && S_ISREG(st.st_mode) && st.st_size > 0) {
       lengths[2] = st.st_size;
       goto show;
     }
-- 
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