Re: [PATCH 1/2] system_data_types.7: Document size_t

Paul Eggert
2020-09-18T17:52:14Z

On 9/18/20 7:34 AM, Florian Weimer via Libc-alpha wrote:
> the length modifier for printf and scanf is z, commently used as
> %zu or %zx (%zd is for ssize_t).

While %zd works for ssize_t in glibc, POSIX doesn't guarantee that it'll work,
as ssize_t might not have the same width as size_t. (If memory serves this goes
back to the bad old days when size_t was 64 bits and ssize_t 32 bits on some
platforms.) So if we document %zd we should say it's a GNU extension to POSIX,
or something like that.