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document riscv64 support in INSTALL document
[android-x86/external-musl-libc.git] / 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
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);