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-rw-r--r--src/time/strftime.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/src/time/strftime.c b/src/time/strftime.c
new file mode 100644
index 00000000..f1b94631
--- /dev/null
+++ b/src/time/strftime.c
@@ -0,0 +1,172 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <langinfo.h>
+#include <time.h>
+#include "__time.h"
+
+// FIXME: integer overflows
+
+const char *__langinfo(nl_item);
+
+size_t strftime(char *s, size_t n, const char *f, const struct tm *tm)
+{
+ nl_item item;
+ int val;
+ const char *fmt;
+ size_t l;
+ for (l=0; *f && l<n; f++) {
+ if (*f == '%') {
+do_fmt:
+ switch (*++f) {
+ case '%':
+ goto literal;
+ case 'E':
+ case 'O':
+ goto do_fmt;
+ case 'a':
+ item = ABDAY_1 + tm->tm_wday;
+ goto nl_strcat;
+ case 'A':
+ item = DAY_1 + tm->tm_wday;
+ goto nl_strcat;
+ case 'h':
+ case 'b':
+ item = ABMON_1 + tm->tm_mon;
+ goto nl_strcat;
+ case 'B':
+ item = MON_1 + tm->tm_mon;
+ goto nl_strcat;
+ case 'c':
+ item = D_T_FMT;
+ goto nl_strftime;
+ case 'C':
+ val = (1900+tm->tm_year) / 100;
+ fmt = "%02d";
+ goto number;
+ case 'd':
+ val = tm->tm_mday;
+ fmt = "%02d";
+ goto number;
+ case 'D':
+ fmt = "%m/%d/%y";
+ goto recu_strftime;
+ case 'e':
+ val = tm->tm_mday;
+ fmt = "%2d";
+ goto number;
+ case 'F':
+ fmt = "%Y-%m-%d";
+ goto recu_strftime;
+ case 'g':
+ // FIXME
+ val = 0; //week_based_year(tm)%100;
+ fmt = "%02d";
+ goto number;
+ case 'G':
+ // FIXME
+ val = 0; //week_based_year(tm);
+ fmt = "%04d";
+ goto number;
+ case 'H':
+ val = tm->tm_hour;
+ fmt = "%02d";
+ goto number;
+ case 'I':
+ val = tm->tm_hour;
+ if (!val) val = 12;
+ else if (val > 12) val -= 12;
+ fmt = "%02d";
+ goto number;
+ case 'j':
+ val = tm->tm_yday+1;
+ fmt = "%03d";
+ goto number;
+ case 'm':
+ val = tm->tm_mon+1;
+ fmt = "%02d";
+ goto number;
+ case 'M':
+ val = tm->tm_min;
+ fmt = "%02d";
+ goto number;
+ case 'n':
+ s[l++] = '\n';
+ continue;
+ case 'p':
+ item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
+ goto nl_strcat;
+ case 'r':
+ item = T_FMT_AMPM;
+ goto nl_strftime;
+ case 'R':
+ fmt = "%H:%M";
+ goto recu_strftime;
+ case 'S':
+ val = tm->tm_sec;
+ fmt = "%02d";
+ goto number;
+ case 't':
+ s[l++] = '\t';
+ continue;
+ case 'T':
+ fmt = "%H:%M:%S";
+ goto recu_strftime;
+ case 'u':
+ val = tm->tm_wday ? tm->tm_wday : 7;
+ fmt = "%d";
+ goto number;
+ case 'U':
+ case 'V':
+ case 'W':
+ // FIXME: week number mess..
+ continue;
+ case 'w':
+ val = tm->tm_wday;
+ fmt = "%d";
+ goto number;
+ case 'x':
+ item = D_FMT;
+ goto nl_strftime;
+ case 'X':
+ item = T_FMT;
+ goto nl_strftime;
+ case 'y':
+ val = tm->tm_year % 100;
+ fmt = "%02d";
+ goto number;
+ case 'Y':
+ val = tm->tm_year + 1900;
+ fmt = "%04d";
+ goto number;
+ case 'z':
+ if (tm->tm_isdst < 0) continue;
+ val = -__timezone - (tm->tm_isdst ? __dst_offset : 0);
+ l += snprintf(s+l, n-l, "%+.2d%.2d", val/3600, abs(val%3600)/60);
+ continue;
+ case 'Z':
+ if (tm->tm_isdst < 0 || !__tzname[0] || !__tzname[0][0])
+ continue;
+ l += snprintf(s+l, n-l, "%s", __tzname[!!tm->tm_isdst]);
+ continue;
+ default:
+ return 0;
+ }
+ }
+literal:
+ s[l++] = *f;
+ continue;
+number:
+ l += snprintf(s+l, n-l, fmt, val);
+ continue;
+nl_strcat:
+ l += snprintf(s+l, n-l, "%s", __langinfo(item));
+ continue;
+nl_strftime:
+ fmt = __langinfo(item);
+recu_strftime:
+ l += strftime(s+l, n-l, fmt, tm);
+ }
+ if (l >= n) return 0;
+ s[l] = 0;
+ return l;
+}