From c5617592223e886304eabe087e57a87dc5fadb97 Mon Sep 17 00:00:00 2001
From: Heng Li <lh3@me.com>
Date: Fri, 12 Dec 2014 16:56:54 -0500
Subject: [PATCH] r1027: segfault caused by the last commit

---
 bwa.c  | 10 ++++++----
 main.c |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/bwa.c b/bwa.c
index 6739edd..f9ce6a1 100644
--- a/bwa.c
+++ b/bwa.c
@@ -370,11 +370,13 @@ int bwa_idx2mem(bwaidx_t *idx)
 void bwa_print_sam_hdr(const bntseq_t *bns, const char *hdr_line)
 {
 	int i, n_SQ = 0;
-	const char *p = hdr_line;
 	extern char *bwa_pg;
-	while ((p = strstr(p, "@SQ\t")) != 0) {
-		if (p == hdr_line || *(p-1) == '\n') ++n_SQ;
-		p += 4;
+	if (hdr_line) {
+		const char *p = hdr_line;
+		while ((p = strstr(p, "@SQ\t")) != 0) {
+			if (p == hdr_line || *(p-1) == '\n') ++n_SQ;
+			p += 4;
+		}
 	}
 	if (n_SQ == 0) {
 		for (i = 0; i < bns->n_seqs; ++i)
diff --git a/main.c b/main.c
index 2a0118c..887ea28 100644
--- a/main.c
+++ b/main.c
@@ -4,7 +4,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.10-r1025-dirty"
+#define PACKAGE_VERSION "0.7.10-r1027-dirty"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);