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snprintf(): If size is zero, then snprintf() should return the size of the required buffer without writing anyting. From Sami Pelkonen

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Gregory Nutt 2014-05-30 08:53:55 -06:00
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@ -7382,3 +7382,6 @@
* arch/arm/src/stm32/stm32_rtcc.c: Add retry logic to RTC initialization.
It sometimes takes longer for the RTC to initialize, at least as noted
on an F2 part. From dlsitzer (2014-5-27).
* libc/stdio/lib_snprintf.c: If the size passed to snprintf() is zero,
then snprintf() must write nothing, but instead return the size of the
buffer needed to hold the entire string. From Sami Pelkonen (2014-5-30).