X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Ftime%2Fstrftime.c;h=708875eeae52fc69be10418cd9fbdaa0e3e33a00;hb=ebd8ef50d5012733d86ed4a6834ca6d776b069ae;hp=d90b690a2bb0d02401219382b1d192a11ba6237e;hpb=45849d3dcb886b7dff236c3905fa3e101e85ed71;p=musl diff --git a/src/time/strftime.c b/src/time/strftime.c index d90b690a..708875ee 100644 --- a/src/time/strftime.c +++ b/src/time/strftime.c @@ -1,12 +1,13 @@ #include #include +#include #include #include #include #include +#include "locale_impl.h" #include "libc.h" - -// FIXME: integer overflows +#include "time_impl.h" const char *__nl_langinfo_l(nl_item, locale_t); @@ -20,108 +21,103 @@ 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; } +const char *__tm_to_tzname(const struct tm *); size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t); -const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *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; + 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 = (1900+tm->tm_year) / 100; - fmt = "%02d"; + val = (1900LL+tm->tm_year) / 100; goto number; + case 'e': + def_pad = '_'; 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; + 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') { - fmt = "%02d"; - val %= 100; - } + if (f=='g') val %= 100; + else width = 4; 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"; + width = 3; 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': + *l = 1; return "\n"; case 'p': item = tm->tm_hour >= 12 ? PM_STR : AM_STR; @@ -132,34 +128,35 @@ const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *tm, locale_ 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; - fmt = "%02d"; 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; - fmt = "%d"; + width = 1; goto number; case 'U': - val = (tm->tm_yday + 7 - tm->tm_wday) / 7; - fmt = "%02d"; + val = (tm->tm_yday + 7U - tm->tm_wday) / 7; goto number; case 'W': - val = (tm->tm_yday + 7 - (tm->tm_wday+6)%7) / 7; - fmt = "%02d"; + val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7; goto number; case 'V': val = week_num(tm); - fmt = "%02d"; goto number; case 'w': val = tm->tm_wday; - fmt = "%d"; + width = 1; goto number; case 'x': item = D_FMT; @@ -168,34 +165,57 @@ const char *__strftime_fmt_1(char (*s)[100], int f, const struct tm *tm, locale_ item = T_FMT; goto nl_strftime; case 'y': - val = tm->tm_year % 100; - fmt = "%02d"; + val = (tm->tm_year + 1900LL) % 100; + if (val < 0) val = -val; goto number; case 'Y': - val = tm->tm_year + 1900; - fmt = "%04d"; + val = tm->tm_year + 1900LL; + if (val >= 10000) { + *l = snprintf(*s, sizeof *s, "+%lld", val); + return *s; + } + width = 4; goto number; case 'z': - val = -tm->__tm_gmtoff; - snprintf(*s, sizeof *s, "%+.2d%.2d", val/3600, abs(val%3600)/60); + if (tm->tm_isdst < 0) { + *l = 0; + return ""; + } + *l = snprintf(*s, sizeof *s, "%+.2d%.2d", + (tm->__tm_gmtoff)/3600, + abs(tm->__tm_gmtoff%3600)/60); return *s; case 'Z': - return tm->__tm_zone; + if (tm->tm_isdst < 0) { + *l = 0; + return ""; + } + fmt = __tm_to_tzname(tm); + goto string; case '%': + *l = 1; return "%"; default: return 0; } number: - snprintf(*s, sizeof *s, fmt, val); + 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: - return __nl_langinfo_l(item, loc); + fmt = __nl_langinfo_l(item, loc); +string: + *l = strlen(fmt); + return fmt; nl_strftime: fmt = __nl_langinfo_l(item, loc); recu_strftime: - l = __strftime_l(*s, sizeof *s, fmt, tm, loc); - if (!l) return 0; + *l = __strftime_l(*s, sizeof *s, fmt, tm, loc); + if (!*l) return 0; return *s; } @@ -203,8 +223,11 @@ size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const st { size_t l, k; char buf[100]; + char *p; const char *t; - for (l=0; l+1= n-l) - return 0; + 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; + } 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, 0); + return __strftime_l(s, n, f, tm, CURRENT_LOCALE); } weak_alias(__strftime_l, strftime_l);