在 2022-01-16 22:44, Pali Rohár 写道:
diff --git a/mingw-w64-crt/stdio/scanf2-argcount-template.c b/mingw-w64-crt/stdio/scanf2-argcount-template.c new file mode 100644 index 000000000000..c07e11797c39 --- /dev/null +++ b/mingw-w64-crt/stdio/scanf2-argcount-template.c @@ -0,0 +1,22 @@ +/** + * This file has no copyright assigned and is placed in the Public Domain. + * This file is part of the mingw-w64 runtime package. + * No warranty is given; refer to the file DISCLAIMER.PD within this package. + */ + +#include <stddef.h> + +size_t FUNC(const TYPE *format); +size_t FUNC(const TYPE *format) +{ + size_t count = 0; + for (; *format; format++) { + if (*format != (TYPE)'%') + continue; + format++; + if (*format == (TYPE)'%' || *format == (TYPE)'*') + continue; + count++; + } + return count; +}
I am afraid there are two issues about this function:One is that it may read pass the end of the format string if it contains a stray `%` at the end (which however is undefined behavior) but I don't think it is a good idea to not handle it properly.
The other is that `%` does not necessarily start an argument specifier. For example `"abc%[01%]"` contains only one specifier for one argument, and this function produces a wrong result.
-- Best regards, LIU Hao
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