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Subject[PATCH 2.6] 1/7 create kstrdup library function

This patch creates the kstrdup library function so that it doesn't have to be
reimplemented (or even EXPORT'ed) by every user that needs it.

Signed-off-by: Paulo Marques <pmarques@grupopie.com>

--
Paulo Marques - www.grupopie.com

All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke (1729 - 1797)
diff -buprN -X dontdiff vanilla-2.6.11-rc2-bk9/include/linux/string.h linux-2.6.11-rc2-bk9/include/linux/string.h
--- vanilla-2.6.11-rc2-bk9/include/linux/string.h 2004-12-24 21:34:31.000000000 +0000
+++ linux-2.6.11-rc2-bk9/include/linux/string.h 2005-01-31 19:31:12.000000000 +0000
@@ -88,6 +88,8 @@ extern int memcmp(const void *,const voi
extern void * memchr(const void *,int,__kernel_size_t);
#endif

+extern char *kstrdup(const char *s, int gfp);
+
#ifdef __cplusplus
}
#endif
diff -buprN -X dontdiff vanilla-2.6.11-rc2-bk9/lib/string.c linux-2.6.11-rc2-bk9/lib/string.c
--- vanilla-2.6.11-rc2-bk9/lib/string.c 2005-01-31 20:05:37.000000000 +0000
+++ linux-2.6.11-rc2-bk9/lib/string.c 2005-01-31 20:00:31.000000000 +0000
@@ -599,3 +599,23 @@ void *memchr(const void *s, int c, size_
}
EXPORT_SYMBOL(memchr);
#endif
+
+/*
+ * 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
+ */
+char *kstrdup(const char *s, int gfp)
+{
+ int len;
+ char *buf;
+
+ if (!s) return NULL;
+
+ len = strlen(s) + 1;
+ buf = kmalloc(len, gfp);
+ if (buf)
+ memcpy(buf, s, len);
+ return buf;
+}
+
+EXPORT_SYMBOL(kstrdup);
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