[Toybox] [PATCH] tar: fix extracting long file paths

[William Djupström]

sscanf does not increment it's return value when matching "%n".
'long_path.tar' contains a file 'long_file_name_..._TRAILING' and 
without this
patch, tar will omit the 'TRAILING' part.

//William

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From 23c7598d8de3f1866368bbc2ca4379d0aeaace9c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?William=20Djupstr=C3=B6m?= <william at deepztream.com>
Date: Mon, 8 Jun 2020 13:38:33 +0200
Subject: [PATCH] tar: fix extracting long file paths

---
 toys/posix/tar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/toys/posix/tar.c b/toys/posix/tar.c
index 9642fbe6..77dd6fe9 100644
--- a/toys/posix/tar.c
+++ b/toys/posix/tar.c
@@ -590,7 +590,7 @@ static void unpack_tar(char *first)
       else if (tar.type == 'L') alloread(&TT.hdr.name, TT.hdr.size);
       else if (tar.type == 'x') {
         char *p, *buf = 0;
-        int i, len, n;
+        int i, len, n = 0;
 
         // Posix extended record "LEN NAME=VALUE\n" format
         alloread(&buf, TT.hdr.size);
@@ -601,7 +601,7 @@ static void unpack_tar(char *first)
             break;
           }
           p[len-1] = 0;
-          if (i == 2) {
+          if (n) {
             TT.hdr.name = xstrdup(p+n);
             break;
           }
-- 
2.20.1

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