github.com/afumu/libc@v0.0.6/musl/src/time/wcsftime.c (about)

     1  #include <wchar.h>
     2  #include <time.h>
     3  #include <locale.h>
     4  #include "locale_impl.h"
     5  #include "time_impl.h"
     6  
     7  size_t __wcsftime_l(wchar_t *restrict s, size_t n, const wchar_t *restrict f, const struct tm *restrict tm, locale_t loc)
     8  {
     9  	size_t l, k;
    10  	char buf[100];
    11  	wchar_t wbuf[100];
    12  	wchar_t *p;
    13  	const char *t_mb;
    14  	const wchar_t *t;
    15  	int pad, plus;
    16  	unsigned long width;
    17  	for (l=0; l<n; f++) {
    18  		if (!*f) {
    19  			s[l] = 0;
    20  			return l;
    21  		}
    22  		if (*f != '%') {
    23  			s[l++] = *f;
    24  			continue;
    25  		}
    26  		f++;
    27  		pad = 0;
    28  		if (*f == '-' || *f == '_' || *f == '0') pad = *f++;
    29  		if ((plus = (*f == '+'))) f++;
    30  		width = wcstoul(f, &p, 10);
    31  		if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
    32  			if (!width && p!=f) width = 1;
    33  		} else {
    34  			width = 0;
    35  		}
    36  		f = p;
    37  		if (*f == 'E' || *f == 'O') f++;
    38  		t_mb = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
    39  		if (!t_mb) break;
    40  		k = mbstowcs(wbuf, t_mb, sizeof wbuf / sizeof *wbuf);
    41  		if (k == (size_t)-1) return 0;
    42  		t = wbuf;
    43  		if (width) {
    44  			for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--);
    45  			width--;
    46  			if (plus && tm->tm_year >= 10000-1900)
    47  				s[l++] = '+';
    48  			else if (tm->tm_year < -1900)
    49  				s[l++] = '-';
    50  			else
    51  				width++;
    52  			for (; width > k && l < n; width--)
    53  				s[l++] = '0';
    54  		}
    55  		if (k >= n-l) k = n-l;
    56  		wmemcpy(s+l, t, k);
    57  		l += k;
    58  	}
    59  	if (n) {
    60  		if (l==n) l=n-1;
    61  		s[l] = 0;
    62  	}
    63  	return 0;
    64  }
    65  
    66  size_t wcsftime(wchar_t *restrict wcs, size_t n, const wchar_t *restrict f, const struct tm *restrict tm)
    67  {
    68  	return __wcsftime_l(wcs, n, f, tm, CURRENT_LOCALE);
    69  }
    70  
    71  weak_alias(__wcsftime_l, wcsftime_l);