diff options
Diffstat (limited to 'usr/src/lib/libc/port/locale/strftime.c')
| -rw-r--r-- | usr/src/lib/libc/port/locale/strftime.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/usr/src/lib/libc/port/locale/strftime.c b/usr/src/lib/libc/port/locale/strftime.c new file mode 100644 index 0000000000..9e7e30f17c --- /dev/null +++ b/usr/src/lib/libc/port/locale/strftime.c @@ -0,0 +1,527 @@ +/* + * 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. + */ + +/* + * Copyright 2010 Nexenta Systems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#include "lint.h" +#include "tzfile.h" +#include <fcntl.h> +#include <sys/stat.h> +#include <string.h> +#include <stdio.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 * const); +static char *_yconv(int, int, int, int, char *, const char *); + +extern char *tzname[]; + +#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_KYWD s, size_t maxsize, + const char *_RESTRICT_KYWD format, const struct tm *_RESTRICT_KYWD 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(const char *format, const struct tm *t, char *pt, const char * const ptlim) +{ + int Ealternative, Oalternative, PadIndex; + struct lc_time_T *tptr = __get_current_time_locale(); + +#define PADDING(x) fmt_padding[x][PadIndex] + + 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) ? + "?" : (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 = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, + pt, ptlim); + continue; + case 'c': + pt = _fmt(tptr->c_fmt, t, pt, ptlim); + continue; + case 'D': + pt = _fmt("%m/%d/%y", t, pt, ptlim); + continue; + case 'd': + pt = _conv(t->tm_mday, + PADDING(PAD_FMT_DAYOFMONTH), 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. + */ + if (Ealternative || Oalternative) + break; + Oalternative++; + goto label; + case 'e': + pt = _conv(t->tm_mday, + PADDING(PAD_FMT_SDAYOFMONTH), pt, ptlim); + continue; + case 'F': + pt = _fmt("%Y-%m-%d", t, pt, ptlim); + continue; + case 'H': + pt = _conv(t->tm_hour, PADDING(PAD_FMT_HMS), + pt, ptlim); + continue; + case 'I': + pt = _conv((t->tm_hour % 12) ? + (t->tm_hour % 12) : 12, + PADDING(PAD_FMT_HMS), pt, ptlim); + continue; + case 'j': + pt = _conv(t->tm_yday + 1, + PADDING(PAD_FMT_DAYOFYEAR), 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, + PADDING(PAD_FMT_SHMS), pt, ptlim); + continue; + 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, + PADDING(PAD_FMT_SHMS), pt, ptlim); + continue; + case 'M': + pt = _conv(t->tm_min, PADDING(PAD_FMT_HMS), + pt, ptlim); + continue; + case 'm': + pt = _conv(t->tm_mon + 1, + PADDING(PAD_FMT_MONTH), + 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); + continue; + case 'r': + pt = _fmt(tptr->ampm_fmt, t, pt, ptlim); + continue; + case 'S': + pt = _conv(t->tm_sec, PADDING(PAD_FMT_HMS), + pt, ptlim); + continue; + + /* + * Note: 's' for seconds since epoch was removed. + * While FreeBSD and Linux appear to support this, + * Sun Solaris does not. Furthermore, the FreeBSD + * implementation was not correct for _LP64. + */ + + 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 + DAYSPERWEEK - + t->tm_wday) / DAYSPERWEEK, + PADDING(PAD_FMT_WEEKOFYEAR), + 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 base; + int yday; + int wday; + int w; + + year = t->tm_year; + base = TM_YEAR_BASE; + yday = t->tm_yday; + wday = t->tm_wday; + for (;;) { + int len; + int bot; + int top; + + len = isleap_sum(year, base) ? + 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) { + ++base; + w = 1; + break; + } + if (yday >= bot) { + w = 1 + ((yday - bot) / + DAYSPERWEEK); + break; + } + --base; + yday += isleap_sum(year, base) ? + 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, + PADDING(PAD_FMT_WEEKOFYEAR), + pt, ptlim); + else if (*format == 'g') { + pt = _yconv(year, base, 0, 1, + pt, ptlim); + } else + pt = _yconv(year, base, 1, 1, + 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); + continue; + case 'W': + pt = _conv((t->tm_yday + DAYSPERWEEK - + (t->tm_wday ? + (t->tm_wday - 1) : + (DAYSPERWEEK - 1))) / DAYSPERWEEK, + PADDING(PAD_FMT_WEEKOFYEAR), + pt, ptlim); + continue; + case 'w': + pt = _conv(t->tm_wday, "%d", pt, ptlim); + continue; + case 'X': + pt = _fmt(tptr->X_fmt, t, pt, ptlim); + continue; + case 'x': + pt = _fmt(tptr->x_fmt, t, pt, ptlim); + continue; + case 'y': + pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, + pt, ptlim); + continue; + case 'Y': + pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, + pt, ptlim); + continue; + case 'Z': + 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; + /* + * 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) + diff = -timezone; + else + diff = -altzone; + if (diff < 0) { + sign = "-"; + diff = -diff; + } else + sign = "+"; + pt = _add(sign, pt, ptlim); + diff /= SECSPERMIN; + diff = (diff / MINSPERHOUR) * 100 + + (diff % MINSPERHOUR); + pt = _conv(diff, PADDING(PAD_FMT_YEAR), + pt, ptlim); + } + continue; + case '+': + pt = _fmt(tptr->date_fmt, t, pt, ptlim); + 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(const int n, const char *format, char *const pt, + const char *const ptlim) +{ + char buf[12]; + + (void) sprintf(buf, format, n); + return (_add(buf, pt, ptlim)); +} + +static char * +_add(const char *str, char *pt, const char *const ptlim) +{ + while (pt < ptlim && (*pt = *str++) != '\0') + ++pt; + return (pt); +} + +/* + * POSIX and the C Standard are unclear or inconsistent about + * what %C and %y do if the year is negative or exceeds 9999. + * Use the convention that %C concatenated with %y yields the + * same output as %Y, and that %Y contains at least 4 bytes, + * with more only if necessary. + */ + +static char * +_yconv(const int a, const int b, const int convert_top, const int convert_yy, + char *pt, const char * const ptlim) +{ + register int lead; + register int trail; + +#define DIVISOR 100 + trail = a % DIVISOR + b % DIVISOR; + lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; + trail %= DIVISOR; + if (trail < 0 && lead > 0) { + trail += DIVISOR; + --lead; + } else if (lead < 0 && trail > 0) { + trail -= DIVISOR; + ++lead; + } + if (convert_top) { + if (lead == 0 && trail < 0) + pt = _add("-0", pt, ptlim); + else pt = _conv(lead, "%02d", pt, ptlim); + } + if (convert_yy) + pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); + return (pt); +} |