[PATCH] 2.5.47: strdup()

[Olaf Dietsche <olaf.dietsche#list.linux-kernel@t-online.de>]

This *untested* patch adds strdup(). There are about five or six
different strdup() implementations in various parts of the kernel.

Regards, Olaf.

diff -urN a/include/linux/string.h b/include/linux/string.h
--- a/include/linux/string.h	Sat Oct  5 18:42:33 2002
+++ b/include/linux/string.h	Sat Nov 16 03:09:42 2002
@@ -15,7 +15,7 @@
 extern char * strpbrk(const char *,const char *);
 extern char * strsep(char **,const char *);
 extern __kernel_size_t strspn(const char *,const char *);
-
+extern char *strdup(const char *);
 
 /*
  * Include machine specific inline routines
diff -urN a/kernel/ksyms.c b/kernel/ksyms.c
--- a/kernel/ksyms.c	Tue Nov 12 17:56:02 2002
+++ b/kernel/ksyms.c	Sat Nov 16 06:53:09 2002
@@ -576,6 +576,7 @@
 EXPORT_SYMBOL(strnicmp);
 EXPORT_SYMBOL(strspn);
 EXPORT_SYMBOL(strsep);
+EXPORT_SYMBOL(strdup);
 
 /* software interrupts */
 EXPORT_SYMBOL(tasklet_init);
diff -urN a/lib/string.c b/lib/string.c
--- a/lib/string.c	Sat Oct  5 18:42:33 2002
+++ b/lib/string.c	Sat Nov 16 07:18:16 2002
@@ -22,6 +22,7 @@
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
+#include <linux/slab.h>
 
 #ifndef __HAVE_ARCH_STRNICMP
 /**
@@ -479,6 +480,20 @@
 		s1++;
 	}
 	return NULL;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRDUP
+/**
+ * strdup - allocate memory and duplicate a string
+ */
+char *strdup(const char *s)
+{
+	char *p = kmalloc(strlen(s) + 1, GFP_KERNEL);
+	if (p)
+		strcpy(p, s);
+
+	return p;
 }
 #endif