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libc/wchar: Implement vswprintf 

Implement vswprintf and let swprintf based on it.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi 2023-06-01 11:23:12 +08:00 committed by Xiang Xiao
parent 6b35a49f6e
commit 5606e77ee0
1 changed files with 19 additions and 6 deletions
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25
libs/libc/wchar/lib_swprintf.c
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@ -35,14 +35,13 @@
****************************************************************************/
/****************************************************************************
* swprintf
* vswprintf
****************************************************************************/
int swprintf(FAR wchar_t *buf, size_t maxlen, FAR const wchar_t *fmt, ...)
int vswprintf(FAR wchar_t *buf, size_t maxlen, FAR const wchar_t *fmt,
va_list ap)
{
struct lib_memoutstream_s memoutstream;
va_list ap;
int n;
/* Initialize a memory stream to write to the buffer */
@ -51,9 +50,23 @@ int swprintf(FAR wchar_t *buf, size_t maxlen, FAR const wchar_t *fmt, ...)
/* Then let lib_vsprintf do the real work */
return lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public,
(FAR const char *)fmt, ap);
}
/****************************************************************************
* swprintf
****************************************************************************/
int swprintf(FAR wchar_t *buf, size_t maxlen, FAR const wchar_t *fmt, ...)
{
va_list ap;
int n;
/* Then let vswprintf do the real work */
va_start(ap, fmt);
n = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public,
(FAR const char *)fmt, ap);
n = vswprintf(buf, maxlen, fmt, ap);
va_end(ap);
return n;