/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)strftime.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include #include /* ** 302 / 1000 is log10(2.0) rounded up. ** Subtract one for the sign bit; ** add one for integer division truncation; ** add one more for a minus sign. */ #define INT_STRLEN_MAXIMUM(type) \ ((sizeof(type) * CHAR_BIT - 1) * 302 / 1000 + 2) /* ** Based on elsieid[] = "@(#)strftime.c 7.15" ** ** This is ANSIish only when time is treated identically in all locales and ** when "multibyte character == plain character". */ 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 *_secs __P((const struct tm *, char *, const char *)); static char *_fmt __P((const char *, const struct tm *, char *, const char *)); 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 's': pt = _secs(t, 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; pt = _conv((i == 0) ? 53 : i, "%02d", pt, ptlim); } continue; #ifdef notdef /* Not in POSIX date(1), System V or ANSI C. */ 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; #endif 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) does. */ default: break; } } if (pt == ptlim) break; *pt++ = *format; } return (pt); } static char * _secs(t, pt, ptlim) const struct tm *t; char *pt; const char *ptlim; { struct tm tmp; time_t s; tmp = *t; s = mktime(&tmp); return (_conv((int)s, "%d", pt, ptlim)); } 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); }