wcsftime.c raw

   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);
  72