/* $NetBSD: strftime.c,v 1.4 1997/07/21 14:09:22 jtc Exp $ */ /* * Copyright (c) 1989 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. */ #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char *sccsid = "@(#)strftime.c 5.11 (Berkeley) 2/24/91"; #else __RCSID("$NetBSD: strftime.c,v 1.4 1997/07/21 14:09:22 jtc Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include #include #include #include #include static size_t gsize; static char *pt; static int _add __P((const char *)); static int _conv __P((int, int, char)); static int _secs __P((const struct tm *)); static size_t _fmt __P((const char *, const struct tm *)); size_t strftime(s, maxsize, format, t) char *s; size_t maxsize; const char *format; const struct tm *t; { tzset(); pt = s; if ((gsize = maxsize) < 1) return (0); if (_fmt(format, t)) { *pt = '\0'; return (maxsize - gsize); } return (0); } #define SUN_WEEK(t) (((t)->tm_yday + 7 - \ ((t)->tm_wday)) / 7) #define MON_WEEK(t) (((t)->tm_yday + 7 - \ ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) / 7) static size_t _fmt(format, t) register const char *format; const struct tm *t; { for (; *format; ++format) { if (*format == '%') { ++format; if (*format == 'E') { /* Alternate Era */ ++format; } else if (*format == 'O') { /* Alternate numeric symbols */ ++format; } switch (*format) { case '\0': --format; break; case 'A': if (t->tm_wday < 0 || t->tm_wday > 6) return (0); if (!_add(_CurrentTimeLocale->day[t->tm_wday])) return (0); continue; case 'a': if (t->tm_wday < 0 || t->tm_wday > 6) return (0); if (!_add(_CurrentTimeLocale->abday[t->tm_wday])) return (0); continue; case 'B': if (t->tm_mon < 0 || t->tm_mon > 11) return (0); if (!_add(_CurrentTimeLocale->mon[t->tm_mon])) return (0); continue; case 'b': case 'h': if (t->tm_mon < 0 || t->tm_mon > 11) return (0); if (!_add(_CurrentTimeLocale->abmon[t->tm_mon])) return (0); continue; case 'C': if (!_conv((t->tm_year + TM_YEAR_BASE) / 100, 2, '0')) return (0); continue; case 'c': if (!_fmt(_CurrentTimeLocale->d_t_fmt, t)) return (0); continue; case 'D': if (!_fmt("%m/%d/%y", t)) return (0); continue; case 'd': if (!_conv(t->tm_mday, 2, '0')) return (0); continue; case 'e': if (!_conv(t->tm_mday, 2, ' ')) return (0); continue; case 'H': if (!_conv(t->tm_hour, 2, '0')) return (0); continue; case 'I': if (!_conv(t->tm_hour % 12 ? t->tm_hour % 12 : 12, 2, '0')) return (0); continue; case 'j': if (!_conv(t->tm_yday + 1, 3, '0')) return (0); continue; case 'k': if (!_conv(t->tm_hour, 2, ' ')) return (0); continue; case 'l': if (!_conv(t->tm_hour % 12 ? t->tm_hour % 12: 12, 2, ' ')) return (0); continue; case 'M': if (!_conv(t->tm_min, 2, '0')) return (0); continue; case 'm': if (!_conv(t->tm_mon + 1, 2, '0')) return (0); continue; case 'n': if (!_add("\n")) return (0); continue; case 'p': if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour >= 12])) return (0); continue; case 'R': if (!_fmt("%H:%M", t)) return (0); continue; case 'r': if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t)) return (0); continue; case 'S': if (!_conv(t->tm_sec, 2, '0')) return (0); continue; case 's': if (!_secs(t)) return (0); continue; case 'T': if (!_fmt("%H:%M:%S", t)) return (0); continue; case 't': if (!_add("\t")) return (0); continue; case 'U': if (!_conv(SUN_WEEK(t), 2, '0')) return (0); continue; case 'u': if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0')) return (0); continue; case 'V': { /* ISO 8601 Week Of Year: * If the week (Monday - Sunday) 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 one. */ int week = MON_WEEK(t); int days = (((t)->tm_yday + 7 - ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) % 7); if (days >= 4) { week++; } else if (week == 0) { week = 53; } if (!_conv(week, 2, '0')) return (0); continue; } case 'W': if (!_conv(MON_WEEK(t), 2, '0')) return (0); continue; case 'w': if (!_conv(t->tm_wday, 1, '0')) return (0); continue; case 'x': if (!_fmt(_CurrentTimeLocale->d_fmt, t)) return (0); continue; case 'X': if (!_fmt(_CurrentTimeLocale->t_fmt, t)) return (0); continue; case 'y': if (!_conv((t->tm_year + TM_YEAR_BASE) % 100, 2, '0')) return (0); continue; case 'Y': if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0')) return (0); continue; case 'Z': if (tzname[t->tm_isdst ? 1 : 0] && !_add(tzname[t->tm_isdst ? 1 : 0])) return (0); 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 (!gsize--) return (0); *pt++ = *format; } return (gsize); } static int _secs(t) const struct tm *t; { static char buf[15]; register time_t s; register char *p; struct tm tmp; /* Make a copy, mktime(3) modifies the tm struct. */ tmp = *t; s = mktime(&tmp); for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10) *p-- = s % 10 + '0'; return (_add(++p)); } static int _conv(n, digits, pad) int n, digits; char pad; { static char buf[10]; register char *p; for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits) *p-- = n % 10 + '0'; while (p > buf && digits-- > 0) *p-- = pad; return (_add(++p)); } static int _add(str) register const char *str; { for (;; ++pt, --gsize) { if (!gsize) return (0); if (!(*pt = *str++)) return (1); } }