vsprintf: Recursive vsnprintf: Add "%pV", struct va_format

[sfrench/cifs-2.6.git] / lib / vsprintf.c

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b8a2f549ab0ef5db70ecae07de8ea3be4d67a06d..4ee19d0d3910b36ad15f88688db46d5d1249fa61 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -980,6 +980,11 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
  *             [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
  *           little endian output byte order is:
  *             [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
+ * - 'V' For a struct va_format which contains a format string * and va_list *,
+ *       call vsnprintf(->format, *->va_list).
+ *       Implements a "recursive vsnprintf".
+ *       Do not use this feature without some mechanism to verify the
+ *       correctness of the format string and va_list arguments.
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
@@ -1025,6 +1030,10 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                break;
        case 'U':
                return uuid_string(buf, end, ptr, spec, fmt);
+       case 'V':
+               return buf + vsnprintf(buf, end - buf,
+                                      ((struct va_format *)ptr)->fmt,
+                                      *(((struct va_format *)ptr)->va));
        }
        spec.flags |= SMALL;
        if (spec.field_width == -1) {