diff options
Diffstat (limited to 'lib/libc/stdtime/strftime.c')
| -rw-r--r-- | lib/libc/stdtime/strftime.c | 592 |
1 files changed, 592 insertions, 0 deletions
diff --git a/lib/libc/stdtime/strftime.c b/lib/libc/stdtime/strftime.c new file mode 100644 index 0000000..3f66ea2 --- /dev/null +++ b/lib/libc/stdtime/strftime.c @@ -0,0 +1,592 @@ +/* + * Copyright (c) 1989 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by the University of California, Berkeley. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifndef lint +#ifndef NOID +static const char elsieid[] = "@(#)strftime.c 7.64"; +/* +** Based on the UCB version with the ID appearing below. +** This is ANSIish only when "multibyte character == plain character". +*/ +#endif /* !defined NOID */ +#endif /* !defined lint */ + +#include "namespace.h" +#include "private.h" + +#if defined(LIBC_SCCS) && !defined(lint) +static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "tzfile.h" +#include <fcntl.h> +#include <sys/stat.h> +#include "un-namespace.h" +#include "timelocal.h" + +static char * _add(const char *, char *, const char *); +static char * _conv(int, const char *, char *, const char *); +static char * _fmt(const char *, const struct tm *, char *, const char *, int *); + +size_t strftime(char * __restrict, size_t, const char * __restrict, + const struct tm * __restrict); + +extern char * tzname[]; + +#ifndef YEAR_2000_NAME +#define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" +#endif /* !defined YEAR_2000_NAME */ + + +#define IN_NONE 0 +#define IN_SOME 1 +#define IN_THIS 2 +#define IN_ALL 3 + +#define PAD_DEFAULT 0 +#define PAD_LESS 1 +#define PAD_SPACE 2 +#define PAD_ZERO 3 + +static const char* fmt_padding[][4] = { + /* DEFAULT, LESS, SPACE, ZERO */ +#define PAD_FMT_MONTHDAY 0 +#define PAD_FMT_HMS 0 +#define PAD_FMT_CENTURY 0 +#define PAD_FMT_SHORTYEAR 0 +#define PAD_FMT_MONTH 0 +#define PAD_FMT_WEEKOFYEAR 0 +#define PAD_FMT_DAYOFMONTH 0 + { "%02d", "%d", "%2d", "%02d" }, +#define PAD_FMT_SDAYOFMONTH 1 +#define PAD_FMT_SHMS 1 + { "%2d", "%d", "%2d", "%02d" }, +#define PAD_FMT_DAYOFYEAR 2 + { "%03d", "%d", "%3d", "%03d" }, +#define PAD_FMT_YEAR 3 + { "%04d", "%d", "%4d", "%04d" } +}; + +size_t +strftime(char * __restrict s, size_t maxsize, const char * __restrict format, + const struct tm * __restrict t) +{ + char * p; + int warn; + + tzset(); + warn = IN_NONE; + p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn); +#ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU + if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { + (void) fprintf(stderr, "\n"); + if (format == NULL) + (void) fprintf(stderr, "NULL strftime format "); + else (void) fprintf(stderr, "strftime format \"%s\" ", + format); + (void) fprintf(stderr, "yields only two digits of years in "); + if (warn == IN_SOME) + (void) fprintf(stderr, "some locales"); + else if (warn == IN_THIS) + (void) fprintf(stderr, "the current locale"); + else (void) fprintf(stderr, "all locales"); + (void) fprintf(stderr, "\n"); + } +#endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ + if (p == s + maxsize) + return 0; + *p = '\0'; + return p - s; +} + +static char * +_fmt(format, t, pt, ptlim, warnp) +const char * format; +const struct tm * const t; +char * pt; +const char * const ptlim; +int * warnp; +{ + int Ealternative, Oalternative, PadIndex; + struct lc_time_T *tptr = __get_current_time_locale(); + + for ( ; *format; ++format) { + if (*format == '%') { + Ealternative = 0; + Oalternative = 0; + PadIndex = PAD_DEFAULT; +label: + switch (*++format) { + case '\0': + --format; + break; + case 'A': + pt = _add((t->tm_wday < 0 || + t->tm_wday >= DAYSPERWEEK) ? + "?" : tptr->weekday[t->tm_wday], + pt, ptlim); + continue; + case 'a': + pt = _add((t->tm_wday < 0 || + t->tm_wday >= DAYSPERWEEK) ? + "?" : tptr->wday[t->tm_wday], + pt, ptlim); + continue; + case 'B': + pt = _add((t->tm_mon < 0 || + t->tm_mon >= MONSPERYEAR) ? + "?" : (Oalternative ? tptr->alt_month : + tptr->month)[t->tm_mon], + pt, ptlim); + continue; + case 'b': + case 'h': + pt = _add((t->tm_mon < 0 || + t->tm_mon >= MONSPERYEAR) ? + "?" : tptr->mon[t->tm_mon], + pt, ptlim); + continue; + case 'C': + /* + ** %C used to do a... + ** _fmt("%a %b %e %X %Y", t); + ** ...whereas now POSIX 1003.2 calls for + ** something completely different. + ** (ado, 1993-05-24) + */ + pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, + fmt_padding[PAD_FMT_CENTURY][PadIndex], pt, ptlim); + continue; + case 'c': + { + int warn2 = IN_SOME; + + pt = _fmt(tptr->c_fmt, t, pt, ptlim, warnp); + if (warn2 == IN_ALL) + warn2 = IN_THIS; + if (warn2 > *warnp) + *warnp = warn2; + } + continue; + case 'D': + pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp); + continue; + case 'd': + pt = _conv(t->tm_mday, fmt_padding[PAD_FMT_DAYOFMONTH][PadIndex], + pt, ptlim); + continue; + case 'E': + if (Ealternative || Oalternative) + break; + Ealternative++; + goto label; + case 'O': + /* + ** C99 locale modifiers. + ** The sequences + ** %Ec %EC %Ex %EX %Ey %EY + ** %Od %oe %OH %OI %Om %OM + ** %OS %Ou %OU %OV %Ow %OW %Oy + ** are supposed to provide alternate + ** representations. + ** + ** FreeBSD extension + ** %OB + */ + if (Ealternative || Oalternative) + break; + Oalternative++; + goto label; + case 'e': + pt = _conv(t->tm_mday, + fmt_padding[PAD_FMT_SDAYOFMONTH][PadIndex], pt, ptlim); + continue; + case 'F': + pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp); + continue; + case 'H': + pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_HMS][PadIndex], + pt, ptlim); + continue; + case 'I': + pt = _conv((t->tm_hour % 12) ? + (t->tm_hour % 12) : 12, + fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim); + continue; + case 'j': + pt = _conv(t->tm_yday + 1, + fmt_padding[PAD_FMT_DAYOFYEAR][PadIndex], pt, ptlim); + continue; + case 'k': + /* + ** This used to be... + ** _conv(t->tm_hour % 12 ? + ** t->tm_hour % 12 : 12, 2, ' '); + ** ...and has been changed to the below to + ** match SunOS 4.1.1 and Arnold Robbins' + ** strftime version 3.0. That is, "%k" and + ** "%l" have been swapped. + ** (ado, 1993-05-24) + */ + pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_SHMS][PadIndex], + pt, ptlim); + continue; +#ifdef KITCHEN_SINK + case 'K': + /* + ** After all this time, still unclaimed! + */ + pt = _add("kitchen sink", pt, ptlim); + continue; +#endif /* defined KITCHEN_SINK */ + case 'l': + /* + ** This used to be... + ** _conv(t->tm_hour, 2, ' '); + ** ...and has been changed to the below to + ** match SunOS 4.1.1 and Arnold Robbin's + ** strftime version 3.0. That is, "%k" and + ** "%l" have been swapped. + ** (ado, 1993-05-24) + */ + pt = _conv((t->tm_hour % 12) ? + (t->tm_hour % 12) : 12, + fmt_padding[PAD_FMT_SHMS][PadIndex], pt, ptlim); + continue; + case 'M': + pt = _conv(t->tm_min, fmt_padding[PAD_FMT_HMS][PadIndex], + pt, ptlim); + continue; + case 'm': + pt = _conv(t->tm_mon + 1, + fmt_padding[PAD_FMT_MONTH][PadIndex], pt, ptlim); + continue; + case 'n': + pt = _add("\n", pt, ptlim); + continue; + case 'p': + pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? + tptr->pm : + tptr->am, + pt, ptlim); + continue; + case 'R': + pt = _fmt("%H:%M", t, pt, ptlim, warnp); + continue; + case 'r': + pt = _fmt(tptr->ampm_fmt, t, pt, ptlim, + warnp); + continue; + case 'S': + pt = _conv(t->tm_sec, fmt_padding[PAD_FMT_HMS][PadIndex], + pt, ptlim); + continue; + case 's': + { + struct tm tm; + char buf[INT_STRLEN_MAXIMUM( + time_t) + 1]; + time_t mkt; + + tm = *t; + mkt = mktime(&tm); + if (TYPE_SIGNED(time_t)) + (void) sprintf(buf, "%ld", + (long) mkt); + else (void) sprintf(buf, "%lu", + (unsigned long) mkt); + pt = _add(buf, pt, ptlim); + } + continue; + case 'T': + pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp); + continue; + case 't': + pt = _add("\t", pt, ptlim); + continue; + case 'U': + pt = _conv((t->tm_yday + DAYSPERWEEK - + t->tm_wday) / DAYSPERWEEK, + fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim); + continue; + case 'u': + /* + ** From Arnold Robbins' strftime version 3.0: + ** "ISO 8601: Weekday as a decimal number + ** [1 (Monday) - 7]" + ** (ado, 1993-05-24) + */ + pt = _conv((t->tm_wday == 0) ? + DAYSPERWEEK : t->tm_wday, + "%d", pt, ptlim); + continue; + case 'V': /* ISO 8601 week number */ + case 'G': /* ISO 8601 year (four digits) */ + case 'g': /* ISO 8601 year (two digits) */ +/* +** From Arnold Robbins' strftime version 3.0: "the week number of the +** year (the first Monday as the first day of week 1) as a decimal number +** (01-53)." +** (ado, 1993-05-24) +** +** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: +** "Week 01 of a year is per definition the first week which has the +** Thursday in this year, which is equivalent to the week which contains +** the fourth day of January. In other words, the first week of a new year +** is the week which has the majority of its days in the new year. Week 01 +** might also contain days from the previous year and the week before week +** 01 of a year is the last week (52 or 53) of the previous year even if +** it contains days from the new year. A week starts with Monday (day 1) +** and ends with Sunday (day 7). For example, the first week of the year +** 1997 lasts from 1996-12-30 to 1997-01-05..." +** (ado, 1996-01-02) +*/ + { + int year; + int yday; + int wday; + int w; + + year = t->tm_year + TM_YEAR_BASE; + yday = t->tm_yday; + wday = t->tm_wday; + for ( ; ; ) { + int len; + int bot; + int top; + + len = isleap(year) ? + DAYSPERLYEAR : + DAYSPERNYEAR; + /* + ** What yday (-3 ... 3) does + ** the ISO year begin on? + */ + bot = ((yday + 11 - wday) % + DAYSPERWEEK) - 3; + /* + ** What yday does the NEXT + ** ISO year begin on? + */ + top = bot - + (len % DAYSPERWEEK); + if (top < -3) + top += DAYSPERWEEK; + top += len; + if (yday >= top) { + ++year; + w = 1; + break; + } + if (yday >= bot) { + w = 1 + ((yday - bot) / + DAYSPERWEEK); + break; + } + --year; + yday += isleap(year) ? + DAYSPERLYEAR : + DAYSPERNYEAR; + } +#ifdef XPG4_1994_04_09 + if ((w == 52 + && t->tm_mon == TM_JANUARY) + || (w == 1 + && t->tm_mon == TM_DECEMBER)) + w = 53; +#endif /* defined XPG4_1994_04_09 */ + if (*format == 'V') + pt = _conv(w, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], + pt, ptlim); + else if (*format == 'g') { + *warnp = IN_ALL; + pt = _conv(year % 100, fmt_padding[PAD_FMT_SHORTYEAR][PadIndex], + pt, ptlim); + } else pt = _conv(year, fmt_padding[PAD_FMT_YEAR][PadIndex], + pt, ptlim); + } + continue; + case 'v': + /* + ** From Arnold Robbins' strftime version 3.0: + ** "date as dd-bbb-YYYY" + ** (ado, 1993-05-24) + */ + pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp); + continue; + case 'W': + pt = _conv((t->tm_yday + DAYSPERWEEK - + (t->tm_wday ? + (t->tm_wday - 1) : + (DAYSPERWEEK - 1))) / DAYSPERWEEK, + fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim); + continue; + case 'w': + pt = _conv(t->tm_wday, "%d", pt, ptlim); + continue; + case 'X': + pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp); + continue; + case 'x': + { + int warn2 = IN_SOME; + + pt = _fmt(tptr->x_fmt, t, pt, ptlim, &warn2); + if (warn2 == IN_ALL) + warn2 = IN_THIS; + if (warn2 > *warnp) + *warnp = warn2; + } + continue; + case 'y': + *warnp = IN_ALL; + pt = _conv((t->tm_year + TM_YEAR_BASE) % 100, + fmt_padding[PAD_FMT_SHORTYEAR][PadIndex], pt, ptlim); + continue; + case 'Y': + pt = _conv(t->tm_year + TM_YEAR_BASE, + fmt_padding[PAD_FMT_YEAR][PadIndex], + pt, ptlim); + continue; + case 'Z': +#ifdef TM_ZONE + if (t->TM_ZONE != NULL) + pt = _add(t->TM_ZONE, pt, ptlim); + else +#endif /* defined TM_ZONE */ + if (t->tm_isdst >= 0) + pt = _add(tzname[t->tm_isdst != 0], + pt, ptlim); + /* + ** C99 says that %Z must be replaced by the + ** empty string if the time zone is not + ** determinable. + */ + continue; + case 'z': + { + int diff; + char const * sign; + + if (t->tm_isdst < 0) + continue; +#ifdef TM_GMTOFF + diff = t->TM_GMTOFF; +#else /* !defined TM_GMTOFF */ + /* + ** C99 says that the UTC offset must + ** be computed by looking only at + ** tm_isdst. This requirement is + ** incorrect, since it means the code + ** must rely on magic (in this case + ** altzone and timezone), and the + ** magic might not have the correct + ** offset. Doing things correctly is + ** tricky and requires disobeying C99; + ** see GNU C strftime for details. + ** For now, punt and conform to the + ** standard, even though it's incorrect. + ** + ** C99 says that %z must be replaced by the + ** empty string if the time zone is not + ** determinable, so output nothing if the + ** appropriate variables are not available. + */ + if (t->tm_isdst == 0) +#ifdef USG_COMPAT + diff = -timezone; +#else /* !defined USG_COMPAT */ + continue; +#endif /* !defined USG_COMPAT */ + else +#ifdef ALTZONE + diff = -altzone; +#else /* !defined ALTZONE */ + continue; +#endif /* !defined ALTZONE */ +#endif /* !defined TM_GMTOFF */ + if (diff < 0) { + sign = "-"; + diff = -diff; + } else sign = "+"; + pt = _add(sign, pt, ptlim); + diff /= 60; + pt = _conv((diff/60)*100 + diff%60, + fmt_padding[PAD_FMT_YEAR][PadIndex], pt, ptlim); + } + continue; + case '+': + pt = _fmt(tptr->date_fmt, t, pt, ptlim, + warnp); + continue; + case '-': + if (PadIndex != PAD_DEFAULT) + break; + PadIndex = PAD_LESS; + goto label; + case '_': + if (PadIndex != PAD_DEFAULT) + break; + PadIndex = PAD_SPACE; + goto label; + case '0': + if (PadIndex != PAD_DEFAULT) + break; + PadIndex = PAD_ZERO; + goto label; + case '%': + /* + ** X311J/88-090 (4.12.3.5): if conversion char is + ** undefined, behavior is undefined. Print out the + ** character itself as printf(3) also does. + */ + default: + break; + } + } + if (pt == ptlim) + break; + *pt++ = *format; + } + return pt; +} + +static char * +_conv(n, format, pt, ptlim) +const int n; +const char * const format; +char * const pt; +const char * const ptlim; +{ + char buf[INT_STRLEN_MAXIMUM(int) + 1]; + + (void) sprintf(buf, format, n); + return _add(buf, pt, ptlim); +} + +static char * +_add(str, pt, ptlim) +const char * str; +char * pt; +const char * const ptlim; +{ + while (pt < ptlim && (*pt = *str++) != '\0') + ++pt; + return pt; +} |
