From: Jeremy Fitzhardinge 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 --- include/linux/kernel.h | 2 ++ lib/vsprintf.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff -puN include/linux/kernel.h~implement-kasprintf include/linux/kernel.h --- 25/include/linux/kernel.h~implement-kasprintf Tue Jun 20 17:54:53 2006 +++ 25-akpm/include/linux/kernel.h Tue Jun 20 17:54:53 2006 @@ -119,6 +119,8 @@ extern int scnprintf(char * buf, size_t __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 -puN lib/vsprintf.c~implement-kasprintf lib/vsprintf.c --- 25/lib/vsprintf.c~implement-kasprintf Tue Jun 20 17:54:53 2006 +++ 25-akpm/lib/vsprintf.c Tue Jun 20 17:54:53 2006 @@ -849,3 +849,26 @@ int sscanf(const char * buf, const char } 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); _