From e905914f96e11862b130dd229f73045dad9a34e8 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Sun, 25 Jun 2006 05:49:17 -0700 Subject: [PATCH] [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 Signed-off-by: Chris Wright Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/kernel.h | 2 ++ lib/vsprintf.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 8c21aaa248..3c5e4c2e51 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 f5959476e5..797428afd1 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); -- 2.39.5