#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <langinfo.h>
#include <locale.h>
#include <time.h>
#include <limits.h>
-#include "libc.h"
-
-// FIXME: integer overflows
-
-const char *__langinfo(nl_item);
+#include "locale_impl.h"
+#include "time_impl.h"
static int is_leap(int y)
{
static int week_num(const struct tm *tm)
{
- int val = (tm->tm_yday + 7 - (tm->tm_wday+6)%7) / 7;
+ int val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
/* If 1 Jan is just 1-3 days past Monday,
* the previous week is also in this year. */
- if ((tm->tm_wday - tm->tm_yday - 2 + 371) % 7 <= 2)
+ if ((tm->tm_wday + 371U - tm->tm_yday - 2) % 7 <= 2)
val++;
if (!val) {
val = 52;
/* If 31 December of prev year a Thursday,
* or Friday of a leap year, then the
* prev year has 53 weeks. */
- int dec31 = (tm->tm_wday - tm->tm_yday - 1 + 7) % 7;
+ int dec31 = (tm->tm_wday + 7U - tm->tm_yday - 1) % 7;
if (dec31 == 4 || (dec31 == 5 && is_leap(tm->tm_year%400-1)))
val++;
} else if (val == 53) {
/* If 1 January is not a Thursday, and not
* a Wednesday of a leap year, then this
* year has only 52 weeks. */
- int jan1 = (tm->tm_wday - tm->tm_yday + 371) % 7;
+ int jan1 = (tm->tm_wday + 371U - tm->tm_yday) % 7;
if (jan1 != 4 && (jan1 != 3 || !is_leap(tm->tm_year)))
val = 1;
}
return val;
}
-size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
+const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc, int pad)
{
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':
- case 'G':
- fmt = "%04d";
- val = tm->tm_year + 1900;
- if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
- else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
- if (*f=='g') {
- fmt = "%02d";
- val %= 100;
- }
- 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':
- val = (tm->tm_yday + 7 - tm->tm_wday) / 7;
- fmt = "%02d";
- goto number;
- case 'W':
- val = (tm->tm_yday + 7 - (tm->tm_wday+6)%7) / 7;
- fmt = "%02d";
- goto number;
- case 'V':
- val = week_num(tm);
- fmt = "%02d";
- goto number;
- 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':
- val = -tm->__tm_gmtoff;
- l += snprintf(s+l, n-l, "%+.2d%.2d", val/3600, abs(val%3600)/60);
- continue;
- case 'Z':
- l += snprintf(s+l, n-l, "%s", tm->__tm_zone);
- continue;
- default:
- return 0;
+ long long val;
+ const char *fmt = "-";
+ int width = 2, def_pad = '0';
+
+ switch (f) {
+ case 'a':
+ if (tm->tm_wday > 6U) goto string;
+ item = ABDAY_1 + tm->tm_wday;
+ goto nl_strcat;
+ case 'A':
+ if (tm->tm_wday > 6U) goto string;
+ item = DAY_1 + tm->tm_wday;
+ goto nl_strcat;
+ case 'h':
+ case 'b':
+ if (tm->tm_mon > 11U) goto string;
+ item = ABMON_1 + tm->tm_mon;
+ goto nl_strcat;
+ case 'B':
+ if (tm->tm_mon > 11U) goto string;
+ item = MON_1 + tm->tm_mon;
+ goto nl_strcat;
+ case 'c':
+ item = D_T_FMT;
+ goto nl_strftime;
+ case 'C':
+ val = (1900LL+tm->tm_year) / 100;
+ goto number;
+ case 'e':
+ def_pad = '_';
+ case 'd':
+ val = tm->tm_mday;
+ goto number;
+ case 'D':
+ fmt = "%m/%d/%y";
+ goto recu_strftime;
+ case 'F':
+ fmt = "%Y-%m-%d";
+ goto recu_strftime;
+ case 'g':
+ case 'G':
+ val = tm->tm_year + 1900LL;
+ if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
+ else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
+ if (f=='g') val %= 100;
+ else width = 4;
+ goto number;
+ case 'H':
+ val = tm->tm_hour;
+ goto number;
+ case 'I':
+ val = tm->tm_hour;
+ if (!val) val = 12;
+ else if (val > 12) val -= 12;
+ goto number;
+ case 'j':
+ val = tm->tm_yday+1;
+ width = 3;
+ goto number;
+ case 'm':
+ val = tm->tm_mon+1;
+ goto number;
+ case 'M':
+ val = tm->tm_min;
+ goto number;
+ case 'n':
+ *l = 1;
+ return "\n";
+ 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_to_secs(tm) - tm->__tm_gmtoff;
+ width = 1;
+ goto number;
+ case 'S':
+ val = tm->tm_sec;
+ goto number;
+ case 't':
+ *l = 1;
+ return "\t";
+ case 'T':
+ fmt = "%H:%M:%S";
+ goto recu_strftime;
+ case 'u':
+ val = tm->tm_wday ? tm->tm_wday : 7;
+ width = 1;
+ goto number;
+ case 'U':
+ val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
+ goto number;
+ case 'W':
+ val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
+ goto number;
+ case 'V':
+ val = week_num(tm);
+ goto number;
+ case 'w':
+ val = tm->tm_wday;
+ width = 1;
+ goto number;
+ case 'x':
+ item = D_FMT;
+ goto nl_strftime;
+ case 'X':
+ item = T_FMT;
+ goto nl_strftime;
+ case 'y':
+ val = (tm->tm_year + 1900LL) % 100;
+ if (val < 0) val = -val;
+ goto number;
+ case 'Y':
+ val = tm->tm_year + 1900LL;
+ if (val >= 10000) {
+ *l = snprintf(*s, sizeof *s, "+%lld", val);
+ return *s;
}
+ width = 4;
+ goto number;
+ case 'z':
+ if (tm->tm_isdst < 0) {
+ *l = 0;
+ return "";
}
-literal:
- s[l++] = *f;
- continue;
+ *l = snprintf(*s, sizeof *s, "%+.4ld",
+ tm->__tm_gmtoff/3600*100 + tm->__tm_gmtoff%3600/60);
+ return *s;
+ case 'Z':
+ if (tm->tm_isdst < 0) {
+ *l = 0;
+ return "";
+ }
+ fmt = __tm_to_tzname(tm);
+ goto string;
+ case '%':
+ *l = 1;
+ return "%";
+ default:
+ return 0;
+ }
number:
- l += snprintf(s+l, n-l, fmt, val);
- continue;
+ switch (pad ? pad : def_pad) {
+ case '-': *l = snprintf(*s, sizeof *s, "%lld", val); break;
+ case '_': *l = snprintf(*s, sizeof *s, "%*lld", width, val); break;
+ case '0':
+ default: *l = snprintf(*s, sizeof *s, "%0*lld", width, val); break;
+ }
+ return *s;
nl_strcat:
- l += snprintf(s+l, n-l, "%s", __langinfo(item));
- continue;
+ fmt = __nl_langinfo_l(item, loc);
+string:
+ *l = strlen(fmt);
+ return fmt;
nl_strftime:
- fmt = __langinfo(item);
+ fmt = __nl_langinfo_l(item, loc);
recu_strftime:
- l += strftime(s+l, n-l, fmt, tm);
+ *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
+ if (!*l) return 0;
+ return *s;
+}
+
+size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
+{
+ size_t l, k;
+ char buf[100];
+ char *p;
+ const char *t;
+ int pad, plus;
+ unsigned long width;
+ for (l=0; l<n; f++) {
+ if (!*f) {
+ s[l] = 0;
+ return l;
+ }
+ if (*f != '%') {
+ s[l++] = *f;
+ continue;
+ }
+ f++;
+ pad = 0;
+ if (*f == '-' || *f == '_' || *f == '0') pad = *f++;
+ if ((plus = (*f == '+'))) f++;
+ width = strtoul(f, &p, 10);
+ if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
+ if (!width && p!=f) width = 1;
+ } else {
+ width = 0;
+ }
+ f = p;
+ if (*f == 'E' || *f == 'O') f++;
+ t = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
+ if (!t) break;
+ if (width) {
+ /* Trim off any sign and leading zeros, then
+ * count remaining digits to determine behavior
+ * for the + flag. */
+ if (*t=='+' || *t=='-') t++, k--;
+ for (; *t=='0' && t[1]-'0'<10U; t++, k--);
+ if (width < k) width = k;
+ size_t d;
+ for (d=0; t[d]-'0'<10U; d++);
+ if (tm->tm_year < -1900) {
+ s[l++] = '-';
+ width--;
+ } else if (plus && d+(width-k) >= (*p=='C'?3:5)) {
+ s[l++] = '+';
+ width--;
+ }
+ for (; width > k && l < n; width--)
+ s[l++] = '0';
+ }
+ if (k > n-l) k = n-l;
+ memcpy(s+l, t, k);
+ l += k;
+ }
+ if (n) {
+ if (l==n) l=n-1;
+ s[l] = 0;
}
- if (l >= n) return 0;
- s[l] = 0;
- return l;
+ return 0;
}
size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
{
- return __strftime_l(s, n, f, tm, LC_GLOBAL_LOCALE);
+ return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
}
weak_alias(__strftime_l, strftime_l);
projects / musl / blobdiff