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libs/libc/strftime: add modifier character support to strftime

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1. make the ltp/open_posix_testsuite/strftime 2-1.c case
2. the modification are referred to https://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html

Signed-off-by: guoshichao <guoshichao@xiaomi.com>
This commit is contained in:
guoshichao 2023-07-14 20:42:22 +08:00 committed by Xiang Xiao
parent dffb472ad9
commit 714926e6ea
1 changed files with 19 additions and 0 deletions
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19
libs/libc/time/lib_strftime.c
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@ -292,6 +292,7 @@ size_t strftime(FAR char *s, size_t max, FAR const char *format,
format++;
len = 0;
process_next:
switch (*format++)
{
/* %a: A three-letter abbreviation for the day of the week. */
@ -366,6 +367,24 @@ size_t strftime(FAR char *s, size_t max, FAR const char *format,
}
break;
/* The 'E' or 'O' are modifier characters to indicate that an
* alternative format or specification should be used rather than
* the one normally used by unmodified conversion specifier.
* the following are the supported format:
* %Ec %EC %Ex %EX %Ey %EY
* %Od %oe %OH %OI %Om %OM
* %OS %Ou %OU %OV %Ow %OW %Oy
* If the alternative format or specification does not exist for
* current locale, then the behavior shall be same as the
* unmodified conversion specification, i.e the %Ec is same as %c
*/
case 'E':
case 'O':
{
goto process_next;
}
/* %e: Like %d, the day of the month as a decimal number, but
* a leading zero is replaced by a space.
*/