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Stop using MBEDTLS_PRINTF_SIZET

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Since Mbed TLS 3.6.0, all officially supported versions of Visual Studio
a printf function family that is sufficiently compliant to C99 for our
purposes, in particular supporting `%zu` for `size_t`. The only platform
without `%zu` that we semi-officially support is older versions of MinGW,
still used in our CI. MinGW provides either a Windows legacy printf or a
standards-compliant printf depending on the value of
`__USE_MINGW_ANSI_STDIO` when compiling each C file. Force the use of the
compliant version. Don't rely on `MBEDTLS_PRINTF_SIZET`, which is defined in
`<mbedtls/debug.h>` and no longer considers the Windows legacy version in
Mbed TLS >= 4.1.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2026-02-20 17:54:06 +01:00
parent cdf3b0a535
commit 64ff7fc1dc
5 changed files with 32 additions and 10 deletions
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11
programs/ssl/ssl_test_lib.h
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@@ -8,6 +8,17 @@
#ifndef MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H
#define MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H
/* On Mingw-w64, force the use of a C99-compliant printf() and friends.
* This is necessary on older versions of Mingw and/or Windows runtimes
* where snprintf does not always zero-terminate the buffer, and does
* not support formats such as "%zu" for size_t and "%lld" for long long.
*/
#if !defined(__USE_MINGW_ANSI_STDIO)
#define __USE_MINGW_ANSI_STDIO 1
#endif
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
#include "mbedtls/private/pk_private.h"
#include "mbedtls/build_info.h"