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[libc] Introduce asctime, asctime_r to LLVM libc

Authored by rtenneti on Mar 31 2021, 1:56 PM.

Description

[libc] Introduce asctime, asctime_r to LLVM libc

[libc] Introduce asctime, asctime_r to LLVM libc

asctime and asctime_r share the same common code. They call asctime_internal
a static inline function.

asctime uses snprintf to return the string representation in a buffer.
It uses the following format (26 characters is the buffer size) as per
7.27.3.1 section in http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2478.pdf.
The buf parameter for asctime_r shall point to a buffer of at least 26 bytes.

snprintf(buf, 26, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",...)

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D99686

Details

Committed
rtennetiMay 3 2021, 5:15 PM
Reviewer
sivachandra
Differential Revision
D99686: [libc] Introduce asctime, asctime_r to LLVM libc
Parents
rG47ee47e1e891: [gn build] Port 7310403e3cdf
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