I just re-checked with ltrace, and yes you're right, it does in fact call snprintf() and frexp() to format floats.

I had done a similar check some time ago, and was surprised to not find any libc calls related to Perl's s/printf()  (which is why I posted) — but that must have been without a float format specifier being used... (rather only integer formatting like %d, %u etc.)   As to the creation of floats, however, I don't see any calls to libc or libm. Any idea what function that would be (just out of curiosity)?

In reply to Re^4: sprintf values by almut
in thread sprintf values by daptal

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