* be generated for the given input, excluding the trailing
* '\0', as per ISO C99. If you want to have the exact
* number of characters written into @buf as return value
- * (not including the trailing '\0'), use vscnprintf. If the
+ * (not including the trailing '\0'), use vscnprintf(). If the
* return is greater than or equal to @size, the resulting
* string is truncated.
*
* Call this function if you are already dealing with a va_list.
- * You probably want snprintf instead.
+ * You probably want snprintf() instead.
*/
int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
* returns 0.
*
* Call this function if you are already dealing with a va_list.
- * You probably want scnprintf instead.
+ * You probably want scnprintf() instead.
*/
int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
* @...: Arguments for the format string
*
* The return value is the number of characters written into @buf not including
- * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is
- * greater than or equal to @size, the resulting string is truncated.
+ * the trailing '\0'. If @size is <= 0 the function returns 0.
*/
int scnprintf(char * buf, size_t size, const char *fmt, ...)
* @args: Arguments for the format string
*
* The function returns the number of characters written
- * into @buf. Use vsnprintf or vscnprintf in order to avoid
+ * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
* buffer overflows.
*
* Call this function if you are already dealing with a va_list.
- * You probably want sprintf instead.
+ * You probably want sprintf() instead.
*/
int vsprintf(char *buf, const char *fmt, va_list args)
{
* @...: Arguments for the format string
*
* The function returns the number of characters written
- * into @buf. Use snprintf or scnprintf in order to avoid
+ * into @buf. Use snprintf() or scnprintf() in order to avoid
* buffer overflows.
*/
int sprintf(char * buf, const char *fmt, ...)
break;
str = next;
}
+
+ /*
+ * Now we've come all the way through so either the input string or the
+ * format ended. In the former case, there can be a %n at the current
+ * position in the format that needs to be filled.
+ */
+ if (*fmt == '%' && *(fmt + 1) == 'n') {
+ int *p = (int *)va_arg(args, int *);
+ *p = str - buf;
+ }
+
return num;
}
/* Simplified asprintf. */
-char *kasprintf(gfp_t gfp, const char *fmt, ...)
+char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
{
- va_list ap;
unsigned int len;
char *p;
+ va_list aq;
- va_start(ap, fmt);
- len = vsnprintf(NULL, 0, fmt, ap);
- va_end(ap);
+ va_copy(aq, ap);
+ len = vsnprintf(NULL, 0, fmt, aq);
+ va_end(aq);
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(kvasprintf);
+char *kasprintf(gfp_t gfp, const char *fmt, ...)
+{
+ va_list ap;
+ char *p;
+
+ va_start(ap, fmt);
+ p = kvasprintf(gfp, fmt, ap);
+ va_end(ap);
+
+ return p;
+}
EXPORT_SYMBOL(kasprintf);