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authorJeremy Fitzhardinge <jeremy@xensource.com>2006-06-25 05:49:17 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:01:23 -0700
commite905914f96e11862b130dd229f73045dad9a34e8 (patch)
tree0e7cff381970e2439de521c3d42ded8c49f69354
parentf796937a062c7aeb44cd0e75e1586c8543634a7d (diff)
[PATCH] Implement kasprintf
Implement kasprintf, a kernel version of asprintf. This allocates the memory required for the formatted string, including the trailing '\0'. Returns NULL on allocation failure. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/kernel.h2
-rw-r--r--lib/vsprintf.c23
2 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 8c21aaa248b..3c5e4c2e517 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -117,6 +117,8 @@ extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
__attribute__ ((format (printf, 3, 4)));
extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
__attribute__ ((format (printf, 3, 0)));
+extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
extern int sscanf(const char *, const char *, ...)
__attribute__ ((format (scanf, 2, 3)));
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index f5959476e53..797428afd11 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -849,3 +849,26 @@ int sscanf(const char * buf, const char * fmt, ...)
}
EXPORT_SYMBOL(sscanf);
+
+
+/* Simplified asprintf. */
+char *kasprintf(gfp_t gfp, const char *fmt, ...)
+{
+ va_list ap;
+ unsigned int len;
+ char *p;
+
+ va_start(ap, fmt);
+ len = vsnprintf(NULL, 0, fmt, ap);
+ va_end(ap);
+
+ p = kmalloc(len+1, gfp);
+ if (!p)
+ return NULL;
+ va_start(ap, fmt);
+ vsnprintf(p, len+1, fmt, ap);
+ va_end(ap);
+ return p;
+}
+
+EXPORT_SYMBOL(kasprintf);