[musl] / src / time / wcsftime.c

#include <wchar.h>
#include <time.h>
#include <string.h>

size_t wcsftime(wchar_t *restrict wcs, size_t n, const wchar_t *restrict f, const struct tm *restrict tm)
{
        size_t k, n0=n;
        char out[100], in[4];
        while (*f) {
                if (!n) return 0;
                if (*f != '%') {
                        *wcs++ = *f++;
                        n--;
                        continue;
                }
                in[2] = in[3] = 0;
                in[0] = *f++;
                if (strchr("EO", (in[1]=*f++)))
                        in[2] = *f++;
                k = strftime(out, sizeof out, in, tm);
                if (!k) return 0;
                k = mbsrtowcs(wcs, (const char *[]){out}, n, 0);
                if (k==(size_t)-1) return 0;
                wcs += k;
                n -= k;
        }
        if (!n) return 0;
        *wcs++ = 0;
        return n0-n;
}