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sscanf(): fix %*s%n

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When using %*s, sscanf should honor conversion specifiers immediately
following the %*s.  For example, the following code should find the
position of the end of the string "hello".

  int end;
  char buf[] = "hello    world";
  sscanf(buf, "%*s%n", &end);
  printf("%d\n", end);

Ideally, sscanf would advance the fmt and str pointers the same as it
would without the *, but the code for that is rather complicated and is
not included in the patch.

Signed-off-by: Andy Spencer <andy753421@gmail.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Spencer 2009-10-01 15:44:27 -07:00 committed by Linus Torvalds
parent d41a4b515e
commit 8fccae2c95
1 changed files with 1 additions and 1 deletions
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2
lib/vsprintf.c
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@ -1771,7 +1771,7 @@ int vsscanf(const char * buf, const char * fmt, va_list args)
* advance both strings to next white space
*/
if (*fmt == '*') {
while (!isspace(*fmt) && *fmt)
while (!isspace(*fmt) && *fmt != '%' && *fmt)
fmt++;
while (!isspace(*str) && *str)
str++;