/* -*- c-file-style: "linux" -*- */ /* * strftime.c * * Public-domain implementation of ANSI C library routine. * * It's written in old-style C for maximal portability. * However, since I'm used to prototypes, I've included them too. * * If you want stuff in the System V ascftime routine, add the SYSV_EXT define. * For extensions from SunOS, add SUNOS_EXT. * For stuff needed to implement the P1003.2 date command, add POSIX2_DATE. * For VMS dates, add VMS_EXT. * For a an RFC822 time format, add MAILHEADER_EXT. * For ISO week years, add ISO_DATE_EXT. * For complete POSIX semantics, add POSIX_SEMANTICS. * * The code for %c, %x, and %X now follows the 1003.2 specification for * the POSIX locale. * This version ignores LOCALE information. * It also doesn't worry about multi-byte characters. * So there. * * This file is also shipped with GAWK (GNU Awk), gawk specific bits of * code are included if GAWK is defined. * * Arnold Robbins * January, February, March, 1991 * Updated March, April 1992 * Updated April, 1993 * Updated February, 1994 * Updated May, 1994 * Updated January, 1995 * Updated September, 1995 * Updated January, 1996 * * Fixes from ado@elsie.nci.nih.gov * February 1991, May 1992 * Fixes from Tor Lillqvist tml@tik.vtt.fi * May, 1993 * Further fixes from ado@elsie.nci.nih.gov * February 1994 * %z code from chip@chinacat.unicom.com * Applied September 1995 * %V code fixed (again) and %G, %g added, * January 1996 */ #include "ruby/ruby.h" #include "ruby/encoding.h" #include "timev.h" #ifndef GAWK #include #include #include #include #include #include #endif #if defined(TM_IN_SYS_TIME) || !defined(GAWK) #include #if HAVE_SYS_TIME_H #include #endif #endif #include /* defaults: season to taste */ #define SYSV_EXT 1 /* stuff in System V ascftime routine */ #define SUNOS_EXT 1 /* stuff in SunOS strftime routine */ #define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */ #define VMS_EXT 1 /* include %v for VMS date format */ #define MAILHEADER_EXT 1 /* add %z for HHMM format */ #define ISO_DATE_EXT 1 /* %G and %g for year of ISO week */ #if defined(ISO_DATE_EXT) #if ! defined(POSIX2_DATE) #define POSIX2_DATE 1 #endif #endif #if defined(POSIX2_DATE) #if ! defined(SYSV_EXT) #define SYSV_EXT 1 #endif #if ! defined(SUNOS_EXT) #define SUNOS_EXT 1 #endif #endif #if defined(POSIX2_DATE) #define adddecl(stuff) stuff #else #define adddecl(stuff) #endif #undef strchr /* avoid AIX weirdness */ #if !defined __STDC__ && !defined _WIN32 #define const /**/ static int weeknumber(); adddecl(static int iso8601wknum();) static int weeknumber_v(); adddecl(static int iso8601wknum_v();) #else static int weeknumber(const struct tm *timeptr, int firstweekday); adddecl(static int iso8601wknum(const struct tm *timeptr);) static int weeknumber_v(const struct vtm *vtm, int firstweekday); adddecl(static int iso8601wknum_v(const struct vtm *vtm);) #endif #ifdef STDC_HEADERS #include #include #else extern void *malloc(); extern void *realloc(); extern char *getenv(); extern char *strchr(); #endif #define range(low, item, hi) max((low), min((item), (hi))) #undef min /* just in case */ /* min --- return minimum of two numbers */ static inline int min(int a, int b) { return (a < b ? a : b); } #undef max /* also, just in case */ /* max --- return maximum of two numbers */ static inline int max(int a, int b) { return (a > b ? a : b); } #ifdef NO_STRING_LITERAL_CONCATENATION #error No string literal concatenation #endif #define add(x,y) (rb_funcall((x), '+', 1, (y))) #define sub(x,y) (rb_funcall((x), '-', 1, (y))) #define mul(x,y) (rb_funcall((x), '*', 1, (y))) #define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y))) #define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y))) #define mod(x,y) (rb_funcall((x), '%', 1, (y))) /* strftime --- produce formatted time */ /* * enc is the encoding of the format. It is used as the encoding of resulted * string, but the name of the month and weekday are always US-ASCII. So it * is only used for the timezone name on Windows. */ static size_t rb_strftime_with_timespec(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, VALUE timev, struct timespec *ts, int gmt) { const char *const endp = s + maxsize; const char *const start = s; const char *sp, *tp; #define TBUFSIZE 100 auto char tbuf[TBUFSIZE]; long off; ptrdiff_t i; int w; long y; int precision, flags, colons; char padding; enum {LEFT, CHCASE, LOWER, UPPER}; #define BIT_OF(n) (1U<<(n)) #ifdef MAILHEADER_EXT int sign; #endif /* various tables, useful in North America */ static const char days_l[][10] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", }; static const char months_l[][10] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December", }; static const char ampm[][3] = { "AM", "PM", }; if (s == NULL || format == NULL || vtm == NULL || maxsize == 0) return 0; /* quick check if we even need to bother */ if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) { err: errno = ERANGE; return 0; } if (enc && (enc == rb_usascii_encoding() || enc == rb_ascii8bit_encoding() || enc == rb_locale_encoding())) { enc = NULL; } for (; *format && s < endp - 1; format++) { #define FLAG_FOUND() do { \ if (precision > 0) \ goto unknown; \ } while (0) #define NEEDS(n) do if (s >= endp || (n) >= endp - s - 1) goto err; while (0) #define FILL_PADDING(i) do { \ if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \ NEEDS(precision); \ memset(s, padding ? padding : ' ', precision - (i)); \ s += precision - (i); \ } \ else { \ NEEDS(i); \ } \ } while (0); #define FMT(def_pad, def_prec, fmt, val) \ do { \ int l; \ if (precision <= 0) precision = (def_prec); \ if (flags & BIT_OF(LEFT)) precision = 1; \ l = snprintf(s, endp - s, \ ((padding == '0' || (!padding && (def_pad) == '0')) ? "%0*"fmt : "%*"fmt), \ precision, (val)); \ if (l < 0) goto err; \ s += l; \ } while (0) #define STRFTIME(fmt) \ do { \ i = rb_strftime_with_timespec(s, endp - s, (fmt), enc, vtm, timev, ts, gmt); \ if (!i) return 0; \ if (precision > i) {\ NEEDS(precision); \ memmove(s + precision - i, s, i);\ memset(s, padding ? padding : ' ', precision - i); \ s += precision; \ }\ else s += i; \ } while (0) #define FMTV(def_pad, def_prec, fmt, val) \ do { \ VALUE tmp = (val); \ if (FIXNUM_P(tmp)) { \ FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \ } \ else { \ VALUE args[2], result; \ size_t l; \ if (precision <= 0) precision = (def_prec); \ if (flags & BIT_OF(LEFT)) precision = 1; \ args[0] = INT2FIX(precision); \ args[1] = (val); \ if (padding == '0' || (!padding && (def_pad) == '0')) \ result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \ else \ result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \ l = strlcpy(s, StringValueCStr(result), endp-s); \ if ((size_t)(endp-s) <= l) \ goto err; \ s += l; \ } \ } while (0) if (*format != '%') { *s++ = *format; continue; } tp = tbuf; sp = format; precision = -1; flags = 0; padding = 0; colons = 0; again: switch (*++format) { case '\0': format--; goto unknown; case '%': FILL_PADDING(1); *s++ = '%'; continue; case 'a': /* abbreviated weekday name */ if (flags & BIT_OF(CHCASE)) { flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE)); flags |= BIT_OF(UPPER); } if (vtm->wday < 0 || vtm->wday > 6) i = 1, tp = "?"; else i = 3, tp = days_l[vtm->wday]; break; case 'A': /* full weekday name */ if (flags & BIT_OF(CHCASE)) { flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE)); flags |= BIT_OF(UPPER); } if (vtm->wday < 0 || vtm->wday > 6) i = 1, tp = "?"; else i = strlen(tp = days_l[vtm->wday]); break; #ifdef SYSV_EXT case 'h': /* abbreviated month name */ #endif case 'b': /* abbreviated month name */ if (flags & BIT_OF(CHCASE)) { flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE)); flags |= BIT_OF(UPPER); } if (vtm->mon < 1 || vtm->mon > 12) i = 1, tp = "?"; else i = 3, tp = months_l[vtm->mon-1]; break; case 'B': /* full month name */ if (flags & BIT_OF(CHCASE)) { flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE)); flags |= BIT_OF(UPPER); } if (vtm->mon < 1 || vtm->mon > 12) i = 1, tp = "?"; else i = strlen(tp = months_l[vtm->mon-1]); break; case 'c': /* appropriate date and time representation */ STRFTIME("%a %b %e %H:%M:%S %Y"); continue; case 'd': /* day of the month, 01 - 31 */ i = range(1, vtm->mday, 31); FMT('0', 2, "d", (int)i); continue; case 'H': /* hour, 24-hour clock, 00 - 23 */ i = range(0, vtm->hour, 23); FMT('0', 2, "d", (int)i); continue; case 'I': /* hour, 12-hour clock, 01 - 12 */ i = range(0, vtm->hour, 23); if (i == 0) i = 12; else if (i > 12) i -= 12; FMT('0', 2, "d", (int)i); continue; case 'j': /* day of the year, 001 - 366 */ i = range(1, vtm->yday, 366); FMT('0', 3, "d", (int)i); continue; case 'm': /* month, 01 - 12 */ i = range(1, vtm->mon, 12); FMT('0', 2, "d", (int)i); continue; case 'M': /* minute, 00 - 59 */ i = range(0, vtm->min, 59); FMT('0', 2, "d", (int)i); continue; case 'p': /* AM or PM based on 12-hour clock */ case 'P': /* am or pm based on 12-hour clock */ if ((*format == 'p' && (flags & BIT_OF(CHCASE))) || (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) { flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE)); flags |= BIT_OF(LOWER); } i = range(0, vtm->hour, 23); if (i < 12) tp = ampm[0]; else tp = ampm[1]; i = 2; break; case 's': if (ts) { time_t sec = ts->tv_sec; if (~(time_t)0 <= 0) FMT('0', 1, PRI_TIMET_PREFIX"d", sec); else FMT('0', 1, PRI_TIMET_PREFIX"u", sec); } else { VALUE sec = div(timev, INT2FIX(1)); FMTV('0', 1, "d", sec); } continue; case 'S': /* second, 00 - 60 */ i = range(0, vtm->sec, 60); FMT('0', 2, "d", (int)i); continue; case 'U': /* week of year, Sunday is first day of week */ FMT('0', 2, "d", weeknumber_v(vtm, 0)); continue; case 'w': /* weekday, Sunday == 0, 0 - 6 */ i = range(0, vtm->wday, 6); FMT('0', 1, "d", (int)i); continue; case 'W': /* week of year, Monday is first day of week */ FMT('0', 2, "d", weeknumber_v(vtm, 1)); continue; case 'x': /* appropriate date representation */ STRFTIME("%m/%d/%y"); continue; case 'X': /* appropriate time representation */ STRFTIME("%H:%M:%S"); continue; case 'y': /* year without a century, 00 - 99 */ i = NUM2INT(mod(vtm->year, INT2FIX(100))); FMT('0', 2, "d", (int)i); continue; case 'Y': /* year with century */ if (FIXNUM_P(vtm->year)) { long y = FIX2LONG(vtm->year); FMT('0', 0 <= y ? 4 : 5, "ld", y); } else { FMTV('0', 4, "d", vtm->year); } continue; #ifdef MAILHEADER_EXT case 'z': /* time zone offset east of GMT e.g. -0600 */ if (gmt) { off = 0; } else { off = NUM2LONG(rb_funcall(vtm->utc_offset, rb_intern("round"), 0)); } if (off < 0) { off = -off; sign = -1; } else { sign = +1; } switch (colons) { case 0: /* %z -> +hhmm */ precision = precision <= 5 ? 2 : precision-3; NEEDS(precision + 3); break; case 1: /* %:z -> +hh:mm */ precision = precision <= 6 ? 2 : precision-4; NEEDS(precision + 4); break; case 2: /* %::z -> +hh:mm:ss */ precision = precision <= 9 ? 2 : precision-7; NEEDS(precision + 7); break; case 3: /* %:::z -> +hh[:mm[:ss]] */ if (off % 3600 == 0) { precision = precision <= 3 ? 2 : precision-1; NEEDS(precision + 3); } else if (off % 60 == 0) { precision = precision <= 6 ? 2 : precision-4; NEEDS(precision + 4); } else { precision = precision <= 9 ? 2 : precision-7; NEEDS(precision + 9); } break; default: format--; goto unknown; } i = snprintf(s, endp - s, (padding == ' ' ? "%+*ld" : "%+.*ld"), precision + 1, sign * (off / 3600)); if (i < 0) goto err; if (sign < 0 && off < 3600) { *(padding == ' ' ? s + i - 2 : s) = '-'; } s += i; off = off % 3600; if (colons == 3 && off == 0) continue; if (1 <= colons) *s++ = ':'; i = snprintf(s, endp - s, "%02d", (int)(off / 60)); if (i < 0) goto err; s += i; off = off % 60; if (colons == 3 && off == 0) continue; if (2 <= colons) { *s++ = ':'; i = snprintf(s, endp - s, "%02d", (int)off); if (i < 0) goto err; s += i; } continue; #endif /* MAILHEADER_EXT */ case 'Z': /* time zone name or abbreviation */ if (flags & BIT_OF(CHCASE)) { flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE)); flags |= BIT_OF(LOWER); } if (gmt) { i = 3; tp = "UTC"; break; } if (vtm->zone == NULL) { i = 0; } else { tp = vtm->zone; if (enc) { for (i = 0; i < TBUFSIZE && tp[i]; i++) { if ((unsigned char)tp[i] > 0x7F) { VALUE str = rb_str_conv_enc_opts(rb_str_new_cstr(tp), rb_locale_encoding(), enc, ECONV_UNDEF_REPLACE|ECONV_INVALID_REPLACE, Qnil); i = strlcpy(tbuf, RSTRING_PTR(str), TBUFSIZE); tp = tbuf; break; } } } else i = strlen(tp); } break; #ifdef SYSV_EXT case 'n': /* same as \n */ FILL_PADDING(1); *s++ = '\n'; continue; case 't': /* same as \t */ FILL_PADDING(1); *s++ = '\t'; continue; case 'D': /* date as %m/%d/%y */ STRFTIME("%m/%d/%y"); continue; case 'e': /* day of month, blank padded */ FMT(' ', 2, "d", range(1, vtm->mday, 31)); continue; case 'r': /* time as %I:%M:%S %p */ STRFTIME("%I:%M:%S %p"); continue; case 'R': /* time as %H:%M */ STRFTIME("%H:%M"); continue; case 'T': /* time as %H:%M:%S */ STRFTIME("%H:%M:%S"); continue; #endif #ifdef SUNOS_EXT case 'k': /* hour, 24-hour clock, blank pad */ i = range(0, vtm->hour, 23); FMT(' ', 2, "d", (int)i); continue; case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */ i = range(0, vtm->hour, 23); if (i == 0) i = 12; else if (i > 12) i -= 12; FMT(' ', 2, "d", (int)i); continue; #endif #ifdef VMS_EXT case 'v': /* date as dd-bbb-YYYY */ STRFTIME("%e-%^b-%4Y"); continue; #endif #ifdef POSIX2_DATE case 'C': FMTV('0', 2, "d", div(vtm->year, INT2FIX(100))); continue; case 'E': /* POSIX locale extensions, ignored for now */ if (!format[1] || !strchr("cCxXyY", format[1])) goto unknown; goto again; case 'O': /* POSIX locale extensions, ignored for now */ if (!format[1] || !strchr("deHkIlmMSuUVwWy", format[1])) goto unknown; goto again; case 'V': /* week of year according ISO 8601 */ FMT('0', 2, "d", iso8601wknum_v(vtm)); continue; case 'u': /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */ FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday); continue; #endif /* POSIX2_DATE */ #ifdef ISO_DATE_EXT case 'G': case 'g': /* * Year of ISO week. * * If it's December but the ISO week number is one, * that week is in next year. * If it's January but the ISO week number is 52 or * 53, that week is in last year. * Otherwise, it's this year. */ { VALUE yv = vtm->year; w = iso8601wknum_v(vtm); if (vtm->mon == 12 && w == 1) yv = add(yv, INT2FIX(1)); else if (vtm->mon == 1 && w >= 52) yv = sub(yv, INT2FIX(1)); if (*format == 'G') { if (FIXNUM_P(yv)) { const long y = FIX2LONG(yv); FMT('0', 0 <= y ? 4 : 5, "ld", y); } else { FMTV('0', 4, "d", yv); } } else { yv = mod(yv, INT2FIX(100)); y = FIX2LONG(yv); FMT('0', 2, "ld", y); } continue; } #endif /* ISO_DATE_EXT */ case 'L': w = 3; goto subsec; case 'N': /* * fractional second digits. default is 9 digits * (nanosecond). * * %3N millisecond (3 digits) * %6N microsecond (6 digits) * %9N nanosecond (9 digits) */ w = 9; subsec: if (precision <= 0) { precision = w; } NEEDS(precision); if (ts) { long subsec = ts->tv_nsec; if (9 < precision) { snprintf(s, endp - s, "%09ld", subsec); memset(s+9, '0', precision-9); s += precision; } else { int i; for (i = 0; i < 9-precision; i++) subsec /= 10; snprintf(s, endp - s, "%0*ld", precision, subsec); s += precision; } } else { VALUE subsec = mod(timev, INT2FIX(1)); int ww; long n; ww = precision; while (9 <= ww) { subsec = mul(subsec, INT2FIX(1000000000)); ww -= 9; } n = 1; for (; 0 < ww; ww--) n *= 10; if (n != 1) subsec = mul(subsec, INT2FIX(n)); subsec = div(subsec, INT2FIX(1)); if (FIXNUM_P(subsec)) { (void)snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec)); s += precision; } else { VALUE args[2], result; args[0] = INT2FIX(precision); args[1] = subsec; result = rb_str_format(2, args, rb_str_new2("%0*d")); (void)strlcpy(s, StringValueCStr(result), endp-s); s += precision; } } continue; case 'F': /* Equivalent to %Y-%m-%d */ STRFTIME("%Y-%m-%d"); continue; case '-': FLAG_FOUND(); flags |= BIT_OF(LEFT); padding = precision = 0; goto again; case '^': FLAG_FOUND(); flags |= BIT_OF(UPPER); goto again; case '#': FLAG_FOUND(); flags |= BIT_OF(CHCASE); goto again; case '_': FLAG_FOUND(); padding = ' '; goto again; case ':': { size_t l = strspn(format, ":"); if (l > 3 || format[l] != 'z') goto unknown; colons = (int)l; format += l - 1; } goto again; case '0': padding = '0'; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { char *e; precision = (int)strtoul(format, &e, 10); format = e - 1; goto again; } default: unknown: i = format - sp + 1; tp = sp; precision = -1; flags = 0; padding = 0; colons = 0; break; } if (i) { FILL_PADDING(i); memcpy(s, tp, i); switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) { case BIT_OF(UPPER): do { if (ISLOWER(*s)) *s = TOUPPER(*s); } while (s++, --i); break; case BIT_OF(LOWER): do { if (ISUPPER(*s)) *s = TOLOWER(*s); } while (s++, --i); break; default: s += i; break; } } } if (s >= endp) { goto err; } if (*format == '\0') { *s = '\0'; return (s - start); } else return 0; } size_t rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, VALUE timev, int gmt) { return rb_strftime_with_timespec(s, maxsize, format, enc, vtm, timev, NULL, gmt); } size_t rb_strftime_timespec(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, struct timespec *ts, int gmt) { return rb_strftime_with_timespec(s, maxsize, format, enc, vtm, Qnil, ts, gmt); } /* isleap --- is a year a leap year? */ static int isleap(long year) { return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0); } static void vtm2tm_noyear(const struct vtm *vtm, struct tm *result) { struct tm tm; /* for isleap() in iso8601wknum. +100 is -1900 (mod 400). */ tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100; tm.tm_mon = vtm->mon-1; tm.tm_mday = vtm->mday; tm.tm_hour = vtm->hour; tm.tm_min = vtm->min; tm.tm_sec = vtm->sec; tm.tm_wday = vtm->wday; tm.tm_yday = vtm->yday-1; tm.tm_isdst = vtm->isdst; #if defined(HAVE_STRUCT_TM_TM_GMTOFF) tm.tm_gmtoff = NUM2LONG(vtm->utc_offset); #endif #if defined(HAVE_TM_ZONE) tm.tm_zone = (char *)vtm->zone; #endif *result = tm; } #ifdef POSIX2_DATE /* iso8601wknum --- compute week number according to ISO 8601 */ static int iso8601wknum(const struct tm *timeptr) { /* * From 1003.2: * If the week (Monday to Sunday) containing January 1 * has four or more days in the new year, then it is week 1; * otherwise it is the highest numbered week of the previous * year (52 or 53), and the next week is week 1. * * ADR: This means if Jan 1 was Monday through Thursday, * it was week 1, otherwise week 52 or 53. * * XPG4 erroneously included POSIX.2 rationale text in the * main body of the standard. Thus it requires week 53. */ int weeknum, jan1day; /* get week number, Monday as first day of the week */ weeknum = weeknumber(timeptr, 1); /* * With thanks and tip of the hatlo to tml@tik.vtt.fi * * What day of the week does January 1 fall on? * We know that * (timeptr->tm_yday - jan1.tm_yday) MOD 7 == * (timeptr->tm_wday - jan1.tm_wday) MOD 7 * and that * jan1.tm_yday == 0 * and that * timeptr->tm_wday MOD 7 == timeptr->tm_wday * from which it follows that. . . */ jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7); if (jan1day < 0) jan1day += 7; /* * If Jan 1 was a Monday through Thursday, it was in * week 1. Otherwise it was last year's highest week, which is * this year's week 0. * * What does that mean? * If Jan 1 was Monday, the week number is exactly right, it can * never be 0. * If it was Tuesday through Thursday, the weeknumber is one * less than it should be, so we add one. * Otherwise, Friday, Saturday or Sunday, the week number is * OK, but if it is 0, it needs to be 52 or 53. */ switch (jan1day) { case 1: /* Monday */ break; case 2: /* Tuesday */ case 3: /* Wednesday */ case 4: /* Thursday */ weeknum++; break; case 5: /* Friday */ case 6: /* Saturday */ case 0: /* Sunday */ if (weeknum == 0) { #ifdef USE_BROKEN_XPG4 /* XPG4 (as of March 1994) says 53 unconditionally */ weeknum = 53; #else /* get week number of last week of last year */ struct tm dec31ly; /* 12/31 last year */ dec31ly = *timeptr; dec31ly.tm_year--; dec31ly.tm_mon = 11; dec31ly.tm_mday = 31; dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1; dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L); weeknum = iso8601wknum(& dec31ly); #endif } break; } if (timeptr->tm_mon == 11) { /* * The last week of the year * can be in week 1 of next year. * Sigh. * * This can only happen if * M T W * 29 30 31 * 30 31 * 31 */ int wday, mday; wday = timeptr->tm_wday; mday = timeptr->tm_mday; if ( (wday == 1 && (mday >= 29 && mday <= 31)) || (wday == 2 && (mday == 30 || mday == 31)) || (wday == 3 && mday == 31)) weeknum = 1; } return weeknum; } static int iso8601wknum_v(const struct vtm *vtm) { struct tm tm; vtm2tm_noyear(vtm, &tm); return iso8601wknum(&tm); } #endif /* weeknumber --- figure how many weeks into the year */ /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */ static int weeknumber(const struct tm *timeptr, int firstweekday) { int wday = timeptr->tm_wday; int ret; if (firstweekday == 1) { if (wday == 0) /* sunday */ wday = 6; else wday--; } ret = ((timeptr->tm_yday + 7 - wday) / 7); if (ret < 0) ret = 0; return ret; } static int weeknumber_v(const struct vtm *vtm, int firstweekday) { struct tm tm; vtm2tm_noyear(vtm, &tm); return weeknumber(&tm, firstweekday); } #if 0 /* ADR --- I'm loathe to mess with ado's code ... */ Date: Wed, 24 Apr 91 20:54:08 MDT From: Michal Jaegermann To: arnold@audiofax.com Hi Arnold, in a process of fixing of strftime() in libraries on Atari ST I grabbed some pieces of code from your own strftime. When doing that it came to mind that your weeknumber() function compiles a little bit nicer in the following form: /* * firstweekday is 0 if starting in Sunday, non-zero if in Monday */ { return (timeptr->tm_yday - timeptr->tm_wday + (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7; } How nicer it depends on a compiler, of course, but always a tiny bit. Cheers, Michal ntomczak@vm.ucs.ualberta.ca #endif #ifdef TEST_STRFTIME /* * NAME: * tst * * SYNOPSIS: * tst * * DESCRIPTION: * "tst" is a test driver for the function "strftime". * * OPTIONS: * None. * * AUTHOR: * Karl Vogel * Control Data Systems, Inc. * vogelke@c-17igp.wpafb.af.mil * * BUGS: * None noticed yet. * * COMPILE: * cc -o tst -DTEST_STRFTIME strftime.c */ /* ADR: I reformatted this to my liking, and deleted some unneeded code. */ #ifndef NULL #include #endif #include #include #define MAXTIME 132 /* * Array of time formats. */ static char *array[] = { "(%%A) full weekday name, var length (Sunday..Saturday) %A", "(%%B) full month name, var length (January..December) %B", "(%%C) Century %C", "(%%D) date (%%m/%%d/%%y) %D", "(%%E) Locale extensions (ignored) %E", "(%%H) hour (24-hour clock, 00..23) %H", "(%%I) hour (12-hour clock, 01..12) %I", "(%%M) minute (00..59) %M", "(%%O) Locale extensions (ignored) %O", "(%%R) time, 24-hour (%%H:%%M) %R", "(%%S) second (00..60) %S", "(%%T) time, 24-hour (%%H:%%M:%%S) %T", "(%%U) week of year, Sunday as first day of week (00..53) %U", "(%%V) week of year according to ISO 8601 %V", "(%%W) week of year, Monday as first day of week (00..53) %W", "(%%X) appropriate locale time representation (%H:%M:%S) %X", "(%%Y) year with century (1970...) %Y", "(%%Z) timezone (EDT), or blank if timezone not determinable %Z", "(%%a) locale's abbreviated weekday name (Sun..Sat) %a", "(%%b) locale's abbreviated month name (Jan..Dec) %b", "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c", "(%%d) day of the month (01..31) %d", "(%%e) day of the month, blank-padded ( 1..31) %e", "(%%h) should be same as (%%b) %h", "(%%j) day of the year (001..366) %j", "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k", "(%%l) hour, 12-hour clock, blank pad ( 1..12) %l", "(%%m) month (01..12) %m", "(%%p) locale's AM or PM based on 12-hour clock %p", "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r", "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u", "(%%v) VMS date (dd-bbb-YYYY) %v", "(%%w) day of week (0..6, Sunday == 0) %w", "(%%x) appropriate locale date representation %x", "(%%y) last two digits of year (00..99) %y", "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z", (char *) NULL }; /* main routine. */ int main(int argc, char **argv) { long time(); char *next; char string[MAXTIME]; int k; int length; struct tm *tm; long clock; /* Call the function. */ clock = time((long *) 0); tm = localtime(&clock); for (k = 0; next = array[k]; k++) { length = strftime(string, MAXTIME, next, tm); printf("%s\n", string); } exit(0); } #endif /* TEST_STRFTIME */