src/time/wcsftime.c

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