src/time/wcsftime.c

   1 #include <wchar.h>
   2 #include <time.h>
   3 #include <locale.h>
   4 #include "locale_impl.h"
   5 #include "libc.h"
   6
   7 const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc);
   8
   9 size_t __wcsftime_l(wchar_t *restrict s, size_t n, const wchar_t *restrict f, const struct tm *restrict tm, locale_t loc)
  10 {
  11         size_t l, k;
  12         char buf[100];
  13         wchar_t wbuf[100];
  14         wchar_t *p;
  15         const char *t_mb;
  16         const wchar_t *t;
  17         int plus;
  18         unsigned long width;
  19         for (l=0; l<n; f++) {
  20                 if (!*f) {
  21                         s[l] = 0;
  22                         return l;
  23                 }
  24                 if (*f != '%') {
  25                         s[l++] = *f;
  26                         continue;
  27                 }
  28                 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);
  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);