libc/stdio: add total_len back #7770
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"The number of characters written if successful or negative value if an error occurred. If the resulting string gets truncated due to buf_size limit, function returns the total number of characters (not including the terminating null-byte) which would have been written, if the limit was not imposed." --- https://en.cppreference.com/w/c/io/vfprintf Signed-off-by: jihandong <jihandong@xiaomi.com>
xiaoxiang781216
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pkarashchenko
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Dec 4, 2022
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Summary
"The number of characters written if successful or negative value if an error occurred. If the resulting string gets truncated due to buf_size limit, function returns the total number of characters (not including the terminating null-byte) which would have been written, if the limit was not imposed." --- https://en.cppreference.com/w/c/io/vfprintf
Regression in #7700
Impact
vprint api behavior change.
Testing