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apps/rehash.c: avoid printf format warning [-Wformat]
The `aarch64-linux-android33-clang` cross-compiler (v14.0.6) complains twice about an unsupported '%n' format specifier, preventing a successful `--strict-warnings` build: error: '%n' specifier not supported on this platform [-Werror,-Wformat] BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d", This is a false positive, because BIO_snprintf() implements its own format parsing (which is implemented in the _dopr() function). This commit fixes the problem by rewriting the code to dispense with the dubious '%n' format specifier. As a side-effect, the code becomes a little bit more comprehensible and self-explaining. Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from #22511)
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