From eddda371449ba925d91d04c615d084adf1b43a33 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Thu, 24 Sep 2015 17:08:26 -0400
Subject: convert strncpy to memcpy

strncpy is known to be a confusing function because of its
termination semantics.  These calls are all correct, but it
takes some examination to see why. In particular, every one
of them expects to copy up to the length limit, and then
makes some arrangement for terminating the result.

We can just use memcpy, along with noting explicitly how the
result is terminated (if it is not already obvious). That
should make it more clear to a reader that we are doing the
right thing.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/help.c b/builtin/help.c
index e1650ab..1cd0c1e 100644
--- a/builtin/help.c
+++ b/builtin/help.c
@@ -176,7 +176,7 @@ static void add_man_viewer(const char *name)
 	while (*p)
 		p = &((*p)->next);
 	*p = xcalloc(1, (sizeof(**p) + len + 1));
-	strncpy((*p)->name, name, len);
+	memcpy((*p)->name, name, len); /* NUL-terminated by xcalloc */
 }
 
 static int supported_man_viewer(const char *name, size_t len)
@@ -192,7 +192,7 @@ static void do_add_man_viewer_info(const char *name,
 {
 	struct man_viewer_info_list *new = xcalloc(1, sizeof(*new) + len + 1);
 
-	strncpy(new->name, name, len);
+	memcpy(new->name, name, len); /* NUL-terminated by xcalloc */
 	new->info = xstrdup(value);
 	new->next = man_viewer_info_list;
 	man_viewer_info_list = new;
diff --git a/fast-import.c b/fast-import.c
index cf6d8bc..4d01efc 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -703,7 +703,7 @@ static struct atom_str *to_atom(const char *s, unsigned short len)
 
 	c = pool_alloc(sizeof(struct atom_str) + len + 1);
 	c->str_len = len;
-	strncpy(c->str_dat, s, len);
+	memcpy(c->str_dat, s, len);
 	c->str_dat[len] = 0;
 	c->next_atom = atom_table[hc];
 	atom_table[hc] = c;
diff --git a/tag.c b/tag.c
index 5b0ac62..5b2a06d 100644
--- a/tag.c
+++ b/tag.c
@@ -82,7 +82,7 @@ int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 	nl = memchr(bufptr, '\n', tail - bufptr);
 	if (!nl || sizeof(type) <= (nl - bufptr))
 		return -1;
-	strncpy(type, bufptr, nl - bufptr);
+	memcpy(type, bufptr, nl - bufptr);
 	type[nl - bufptr] = '\0';
 	bufptr = nl + 1;
 
-- 
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