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authorJeremy Fitzhardinge <jeremy@xensource.com>2007-07-17 18:37:02 -0700
committerJeremy Fitzhardinge <jeremy@goop.org>2007-07-18 08:47:39 -0700
commit1e66df3ee301209f4a38df097d7cc5cb9b367a3f (patch)
tree55beb2a342dbe08c0404f749e02808e3f09023ac /mm/util.c
parent8b4a40809e5330c9da5d20107d693d92d73b31dc (diff)
downloadlinux-1e66df3ee301209f4a38df097d7cc5cb9b367a3f.tar.gz
add kstrndup
Add a kstrndup function, modelled on strndup. Like strndup this returns a string copied into its own allocated memory, but it copies no more than the specified number of bytes from the source. Remove private strndup() from irda code. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@mandriva.com> Cc: Al Viro <viro@ftp.linux.org.uk> Cc: Panagiotis Issaris <takis@issaris.org> Cc: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c26
1 files changed, 24 insertions, 2 deletions
diff --git a/mm/util.c b/mm/util.c
index 78f3783bdcc..bf340d80686 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -6,7 +6,6 @@
/**
* kstrdup - allocate space for and copy an existing string
- *
* @s: the string to duplicate
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*/
@@ -27,6 +26,30 @@ char *kstrdup(const char *s, gfp_t gfp)
EXPORT_SYMBOL(kstrdup);
/**
+ * kstrndup - allocate space for and copy an existing string
+ * @s: the string to duplicate
+ * @max: read at most @max chars from @s
+ * @gfp: the GFP mask used in the kmalloc() call when allocating memory
+ */
+char *kstrndup(const char *s, size_t max, gfp_t gfp)
+{
+ size_t len;
+ char *buf;
+
+ if (!s)
+ return NULL;
+
+ len = strnlen(s, max);
+ buf = kmalloc_track_caller(len+1, gfp);
+ if (buf) {
+ memcpy(buf, s, len);
+ buf[len] = '\0';
+ }
+ return buf;
+}
+EXPORT_SYMBOL(kstrndup);
+
+/**
* kmemdup - duplicate region of memory
*
* @src: memory region to duplicate
@@ -80,7 +103,6 @@ EXPORT_SYMBOL(krealloc);
/*
* strndup_user - duplicate an existing string from user space
- *
* @s: The string to duplicate
* @n: Maximum number of bytes to copy, including the trailing NUL.
*/