diff options
Diffstat (limited to 'lib/libc/stdtime/strftime.c')
| -rw-r--r-- | lib/libc/stdtime/strftime.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/lib/libc/stdtime/strftime.c b/lib/libc/stdtime/strftime.c new file mode 100644 index 0000000..9aa891f --- /dev/null +++ b/lib/libc/stdtime/strftime.c @@ -0,0 +1,442 @@ +/* + * 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. + */ + +#ifdef LIBC_RCS +static const char rcsid[] = + "$FreeBSD$"; +#endif + +#ifndef lint +#ifndef NOID +static const char elsieid[] = "@(#)strftime.c 7.38"; +/* +** 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 "private.h" + +#ifndef LIBC_SCCS +#ifndef lint +static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; +#endif /* !defined lint */ +#endif /* !defined LIBC_SCCS */ + +#include "tzfile.h" +#include <fcntl.h> +#include <sys/stat.h> +#include "timelocal.h" + +static char * _add P((const char *, char *, const char *)); +static char * _conv P((int, const char *, char *, const char *)); +static char * _fmt P((const char *, const struct tm *, char *, const char *)); + +size_t strftime P((char *, size_t, const char *, const struct tm *)); + +extern char * tzname[]; + +size_t +strftime(s, maxsize, format, t) + char *const s; + const size_t maxsize; + const char *const format; + const struct tm *const t; +{ + char *p; + + tzset(); + p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); + if (p == s + maxsize) + return 0; + *p = '\0'; + return p - s; +} + +static char * +_fmt(format, t, pt, ptlim) + const char *format; + const struct tm *const t; + char *pt; + const char *const ptlim; +{ + int Ealternative, Oalternative; + + for ( ; *format; ++format) { + if (*format == '%') { + Ealternative = 0; + Oalternative = 0; +label: + switch (*++format) { + case '\0': + --format; + break; + case 'A': + pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? + "?" : Locale->weekday[t->tm_wday], + pt, ptlim); + continue; + case 'a': + pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? + "?" : Locale->wday[t->tm_wday], + pt, ptlim); + continue; + case 'B': + pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? + "?" : (Oalternative ? Locale->alt_month : + Locale->month)[t->tm_mon], + pt, ptlim); + continue; + case 'b': + case 'h': + pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? + "?" : Locale->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, 5/24/93) + */ + pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, + "%02d", pt, ptlim); + continue; + case 'c': + pt = _fmt(Locale->c_fmt, t, pt, ptlim); + continue; + case 'D': + pt = _fmt("%m/%d/%y", t, pt, ptlim); + continue; + case 'd': + pt = _conv(t->tm_mday, "%02d", pt, ptlim); + continue; + case 'E': + if (Ealternative || Oalternative) + break; + Ealternative++; + goto label; + case 'O': + /* + ** POSIX locale extensions, a la + ** Arnold Robbins' strftime version 3.0. + ** 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. + ** (ado, 5/24/93) + ** + ** FreeBSD extensions + ** %OB %Ef %EF + */ + if (Ealternative || Oalternative) + break; + Oalternative++; + goto label; + case 'e': + pt = _conv(t->tm_mday, "%2d", pt, ptlim); + continue; + case 'f': + if (!Ealternative) + break; + pt = _fmt(Locale->Ef_fmt, t, pt, ptlim); + continue; + case 'F': + if (!Ealternative) + break; + pt = _fmt(Locale->EF_fmt, t, pt, ptlim); + continue; + case 'H': + pt = _conv(t->tm_hour, "%02d", pt, ptlim); + continue; + case 'I': + pt = _conv((t->tm_hour % 12) ? + (t->tm_hour % 12) : 12, + "%02d", pt, ptlim); + continue; + case 'j': + pt = _conv(t->tm_yday + 1, "%03d", 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, 5/24/93) + */ + pt = _conv(t->tm_hour, "%2d", 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, 5/24/93) + */ + pt = _conv((t->tm_hour % 12) ? + (t->tm_hour % 12) : 12, + "%2d", pt, ptlim); + continue; + case 'M': + pt = _conv(t->tm_min, "%02d", pt, ptlim); + continue; + case 'm': + pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); + continue; + case 'n': + pt = _add("\n", pt, ptlim); + continue; + case 'p': + pt = _add((t->tm_hour >= 12) ? + Locale->pm : + Locale->am, + pt, ptlim); + continue; + case 'R': + pt = _fmt("%H:%M", t, pt, ptlim); + continue; + case 'r': + pt = _fmt("%I:%M:%S %p", t, pt, ptlim); + continue; + case 'S': + pt = _conv(t->tm_sec, "%02d", 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); + continue; + case 't': + pt = _add("\t", pt, ptlim); + continue; + case 'U': + pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7, + "%02d", pt, ptlim); + continue; + case 'u': + /* + ** From Arnold Robbins' strftime version 3.0: + ** "ISO 8601: Weekday as a decimal number + ** [1 (Monday) - 7]" + ** (ado, 5/24/93) + */ + pt = _conv((t->tm_wday == 0) ? 7 : 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, "%02d", + pt, ptlim); + else if (*format == 'g') { + pt = _conv(year % 100, "%02d", + pt, ptlim); + } else pt = _conv(year, "%04d", + pt, ptlim); + } + continue; + case 'v': + /* + ** From Arnold Robbins' strftime version 3.0: + ** "date as dd-bbb-YYYY" + ** (ado, 5/24/93) + */ + pt = _fmt("%e-%b-%Y", t, pt, ptlim); + continue; + case 'W': + pt = _conv((t->tm_yday + 7 - + (t->tm_wday ? + (t->tm_wday - 1) : 6)) / 7, + "%02d", pt, ptlim); + continue; + case 'w': + pt = _conv(t->tm_wday, "%d", pt, ptlim); + continue; + case 'X': + pt = _fmt(Locale->X_fmt, t, pt, ptlim); + continue; + case 'x': + pt = _fmt(Locale->x_fmt, t, pt, ptlim); + continue; + case 'y': + pt = _conv((t->tm_year + TM_YEAR_BASE) % 100, + "%02d", pt, ptlim); + continue; + case 'Y': + pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d", + pt, ptlim); + continue; + case 'Z': + if (t->tm_zone != NULL) + pt = _add(t->tm_zone, pt, ptlim); + else + if (t->tm_isdst == 0 || t->tm_isdst == 1) { + pt = _add(tzname[t->tm_isdst], + pt, ptlim); + } else pt = _add("?", pt, ptlim); + continue; + case '+': + pt = _fmt(Locale->date_fmt, t, pt, ptlim); + continue; + 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; +} |
