diff options
Diffstat (limited to 'lib/libc/stdtime/strftime.c')
| -rw-r--r-- | lib/libc/stdtime/strftime.c | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/lib/libc/stdtime/strftime.c b/lib/libc/stdtime/strftime.c new file mode 100644 index 0000000..821bc79 --- /dev/null +++ b/lib/libc/stdtime/strftime.c @@ -0,0 +1,393 @@ +#ifndef lint +#ifndef NOID +static char elsieid[] = "@(#)strftime.c 7.19"; +/* +** Based on the UCB version with the ID appearing below. +** This is ANSIish only when time is treated identically in all locales and +** when "multibyte character == plain character". +*/ +#endif /* !defined NOID */ +#endif /* !defined lint */ + +#include "private.h" + +/* + * 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 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" + +static const char afmt[][4] = { + "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" +}; +static const char Afmt[][10] = { + "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", + "Saturday" +}; +static const char bfmt[][4] = { + "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", + "Oct", "Nov", "Dec" +}; +static const char Bfmt[][10] = { + "January", "February", "March", "April", "May", "June", "July", + "August", "September", "October", "November", "December" +}; + +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 *s; + size_t maxsize; + const char *format; + const struct tm *t; +{ + char *p; + + p = _fmt(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 *t; + char *pt; + const char *ptlim; +{ + for (; *format; ++format) { + if (*format == '%') { +label: + switch(*++format) { + case '\0': + --format; + break; + case 'A': + pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? + "?" : Afmt[t->tm_wday], pt, ptlim); + continue; + case 'a': + pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? + "?" : afmt[t->tm_wday], pt, ptlim); + continue; + case 'B': + pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? + "?" : Bfmt[t->tm_mon], pt, ptlim); + continue; + case 'b': + case 'h': + pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? + "?" : bfmt[t->tm_mon], pt, ptlim); + continue; + case 'c': + pt = _fmt("%D %X", t, 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 'D': + pt = _fmt("%m/%d/%y", t, pt, ptlim); + continue; + case 'x': + /* + ** Version 3.0 of strftime from Arnold Robbins + ** (arnold@skeeve.atl.ga.us) does the + ** equivalent of... + ** _fmt("%a %b %e %Y"); + ** ...for %x; since the X3J11 C language + ** standard calls for "date, using locale's + ** date format," anything goes. Using just + ** numbers (as here) makes Quakers happier. + ** Word from Paul Eggert (eggert@twinsun.com) + ** is that %Y-%m-%d is the ISO standard date + ** format, specified in ISO 2014 and later + ** ISO 8601:1988, with a summary available in + ** pub/doc/ISO/english/ISO8601.ps.Z on + ** ftp.uni-erlangen.de. + ** (ado, 5/30/93) + */ + pt = _fmt("%m/%d/%y", t, pt, ptlim); + continue; + case 'd': + pt = _conv(t->tm_mday, "%02d", pt, ptlim); + continue; + case 'E': + case 'O': + /* + ** POSIX locale extensions, a la + ** Arnold Robbins' strftime version 3.0. + ** The sequences + ** %Ec %EC %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) + */ + goto label; + case 'e': + pt = _conv(t->tm_mday, "%2d", 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 ? "PM" : "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 'T': + case 'X': + 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': + /* + ** 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). The method for + ** determining the week number is as specified + ** by ISO 8601 (to wit: if the week containing + ** January 1 has four or more days in the new + ** year, then it is week 1, otherwise it is + ** week 53 of the previous year and the next + ** week is week 1)." + ** (ado, 5/24/93) + */ + /* + ** XXX--If January 1 falls on a Friday, + ** January 1-3 are part of week 53 of the + ** previous year. By analogy, if January + ** 1 falls on a Thursday, are December 29-31 + ** of the PREVIOUS year part of week 1??? + ** (ado 5/24/93) + ** + ** You are understood not to expect this. + */ + { + int i; + + i = (t->tm_yday + 10 - (t->tm_wday ? + (t->tm_wday - 1) : 6)) / 7; + if (i == 0) { + /* + ** What day of the week does + ** January 1 fall on? + */ + i = t->tm_wday - + (t->tm_yday - 1); + /* + ** Fri Jan 1: 53 + ** Sun Jan 1: 52 + ** Sat Jan 1: 53 if previous + ** year a leap + ** year, else 52 + */ + if (i == TM_FRIDAY) + i = 53; + else if (i == TM_SUNDAY) + i = 52; + else i = isleap(t->tm_year + + TM_YEAR_BASE) ? + 53 : 52; +#ifdef XPG4_1994_04_09 + /* + ** As of 4/9/94, though, + ** XPG4 calls for 53 + ** unconditionally. + */ + i = 53; +#endif /* defined XPG4_1994_04_09 */ + } + pt = _conv(i, "%02d", 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 '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': +#ifdef TM_ZONE + if (t->TM_ZONE) + pt = _add(t->TM_ZONE, pt, ptlim); + else +#endif /* defined TM_ZONE */ + if (t->tm_isdst == 0 || t->tm_isdst == 1) { + pt = _add(tzname[t->tm_isdst], + pt, ptlim); + } else pt = _add("?", 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) + int n; + const char *format; + char *pt; + const char *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 *ptlim; +{ + while (pt < ptlim && (*pt = *str++) != '\0') + ++pt; + return pt; +} |
