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strftime.c

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00001 /* -*- c-file-style: "linux" -*- */
00002 
00003 /*
00004  * strftime.c
00005  *
00006  * Public-domain implementation of ANSI C library routine.
00007  *
00008  * It's written in old-style C for maximal portability.
00009  * However, since I'm used to prototypes, I've included them too.
00010  *
00011  * If you want stuff in the System V ascftime routine, add the SYSV_EXT define.
00012  * For extensions from SunOS, add SUNOS_EXT.
00013  * For stuff needed to implement the P1003.2 date command, add POSIX2_DATE.
00014  * For VMS dates, add VMS_EXT.
00015  * For a an RFC822 time format, add MAILHEADER_EXT.
00016  * For ISO week years, add ISO_DATE_EXT.
00017  * For complete POSIX semantics, add POSIX_SEMANTICS.
00018  *
00019  * The code for %c, %x, and %X now follows the 1003.2 specification for
00020  * the POSIX locale.
00021  * This version ignores LOCALE information.
00022  * It also doesn't worry about multi-byte characters.
00023  * So there.
00024  *
00025  * This file is also shipped with GAWK (GNU Awk), gawk specific bits of
00026  * code are included if GAWK is defined.
00027  *
00028  * Arnold Robbins
00029  * January, February, March, 1991
00030  * Updated March, April 1992
00031  * Updated April, 1993
00032  * Updated February, 1994
00033  * Updated May, 1994
00034  * Updated January, 1995
00035  * Updated September, 1995
00036  * Updated January, 1996
00037  *
00038  * Fixes from ado@elsie.nci.nih.gov
00039  * February 1991, May 1992
00040  * Fixes from Tor Lillqvist tml@tik.vtt.fi
00041  * May, 1993
00042  * Further fixes from ado@elsie.nci.nih.gov
00043  * February 1994
00044  * %z code from chip@chinacat.unicom.com
00045  * Applied September 1995
00046  * %V code fixed (again) and %G, %g added,
00047  * January 1996
00048  */
00049 
00050 #include "ruby/ruby.h"
00051 #include "timev.h"
00052 
00053 #ifndef GAWK
00054 #include <stdio.h>
00055 #include <ctype.h>
00056 #include <string.h>
00057 #include <time.h>
00058 #include <sys/types.h>
00059 #include <errno.h>
00060 #endif
00061 #if defined(TM_IN_SYS_TIME) || !defined(GAWK)
00062 #include <sys/types.h>
00063 #if HAVE_SYS_TIME_H
00064 #include <sys/time.h>
00065 #endif
00066 #endif
00067 #include <math.h>
00068 
00069 /* defaults: season to taste */
00070 #define SYSV_EXT        1       /* stuff in System V ascftime routine */
00071 #define SUNOS_EXT       1       /* stuff in SunOS strftime routine */
00072 #define POSIX2_DATE     1       /* stuff in Posix 1003.2 date command */
00073 #define VMS_EXT         1       /* include %v for VMS date format */
00074 #define MAILHEADER_EXT  1       /* add %z for HHMM format */
00075 #define ISO_DATE_EXT    1       /* %G and %g for year of ISO week */
00076 #ifndef GAWK
00077 #define POSIX_SEMANTICS 1       /* call tzset() if TZ changes */
00078 #endif
00079 
00080 #if defined(ISO_DATE_EXT)
00081 #if ! defined(POSIX2_DATE)
00082 #define POSIX2_DATE     1
00083 #endif
00084 #endif
00085 
00086 #if defined(POSIX2_DATE)
00087 #if ! defined(SYSV_EXT)
00088 #define SYSV_EXT        1
00089 #endif
00090 #if ! defined(SUNOS_EXT)
00091 #define SUNOS_EXT       1
00092 #endif
00093 #endif
00094 
00095 #if defined(POSIX2_DATE)
00096 #define adddecl(stuff)  stuff
00097 #else
00098 #define adddecl(stuff)
00099 #endif
00100 
00101 #undef strchr   /* avoid AIX weirdness */
00102 
00103 #if !defined __STDC__ && !defined _WIN32
00104 #define const   
00105 static int weeknumber();
00106 adddecl(static int iso8601wknum();)
00107 static int weeknumber_v();
00108 adddecl(static int iso8601wknum_v();)
00109 #else
00110 static int weeknumber(const struct tm *timeptr, int firstweekday);
00111 adddecl(static int iso8601wknum(const struct tm *timeptr);)
00112 static int weeknumber_v(const struct vtm *vtm, int firstweekday);
00113 adddecl(static int iso8601wknum_v(const struct vtm *vtm);)
00114 #endif
00115 
00116 #ifdef STDC_HEADERS
00117 #include <stdlib.h>
00118 #include <string.h>
00119 #else
00120 extern void *malloc();
00121 extern void *realloc();
00122 extern char *getenv();
00123 extern char *strchr();
00124 #endif
00125 
00126 #define range(low, item, hi)    max(low, min(item, hi))
00127 
00128 #if defined __WIN32__ || defined _WIN32
00129 #define DLL_IMPORT __declspec(dllimport)
00130 #endif
00131 #ifndef DLL_IMPORT
00132 #define DLL_IMPORT
00133 #endif
00134 #if !defined(OS2) && defined(HAVE_TZNAME)
00135 extern DLL_IMPORT char *tzname[2];
00136 #ifdef HAVE_DAYLIGHT
00137 extern DLL_IMPORT int daylight;
00138 #endif
00139 #ifdef HAVE_VAR_TIMEZONE
00140 extern DLL_IMPORT TYPEOF_VAR_TIMEZONE timezone;
00141 #endif
00142 #ifdef HAVE_VAR_ALTZONE
00143 extern DLL_IMPORT TYPEOF_VAR_ALTZONE altzone;
00144 #endif
00145 #endif
00146 
00147 #undef min      /* just in case */
00148 
00149 /* min --- return minimum of two numbers */
00150 
00151 #ifndef __STDC__
00152 static inline int
00153 min(a, b)
00154 int a, b;
00155 #else
00156 static inline int
00157 min(int a, int b)
00158 #endif
00159 {
00160         return (a < b ? a : b);
00161 }
00162 
00163 #undef max      /* also, just in case */
00164 
00165 /* max --- return maximum of two numbers */
00166 
00167 #ifndef __STDC__
00168 static inline int
00169 max(a, b)
00170 int a, b;
00171 #else
00172 static inline int
00173 max(int a, int b)
00174 #endif
00175 {
00176         return (a > b ? a : b);
00177 }
00178 
00179 #ifdef NO_STRING_LITERAL_CONCATENATION
00180 #error No string literal concatenation
00181 #endif
00182 
00183 #define add(x,y) (rb_funcall((x), '+', 1, (y)))
00184 #define sub(x,y) (rb_funcall((x), '-', 1, (y)))
00185 #define mul(x,y) (rb_funcall((x), '*', 1, (y)))
00186 #define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y)))
00187 #define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y)))
00188 #define mod(x,y) (rb_funcall((x), '%', 1, (y)))
00189 
00190 /* strftime --- produce formatted time */
00191 
00192 static size_t
00193 rb_strftime_with_timespec(char *s, size_t maxsize, const char *format, const struct vtm *vtm, VALUE timev, struct timespec *ts, int gmt)
00194 {
00195         char *endp = s + maxsize;
00196         char *start = s;
00197         const char *sp, *tp;
00198         auto char tbuf[100];
00199         long off;
00200         ptrdiff_t i;
00201         int w;
00202         long y;
00203         static short first = 1;
00204 #ifdef POSIX_SEMANTICS
00205         static char *savetz = NULL;
00206         static size_t savetzlen = 0;
00207         char *tz;
00208 #endif /* POSIX_SEMANTICS */
00209 #ifndef HAVE_TM_ZONE
00210 #ifndef HAVE_TM_NAME
00211 #if ((defined(MAILHEADER_EXT) && !HAVE_VAR_TIMEZONE && HAVE_GETTIMEOFDAY) || \
00212      (!HAVE_TZNAME && HAVE_TIMEZONE))
00213         struct timeval tv;
00214         struct timezone zone;
00215 #endif
00216 #endif /* HAVE_TM_NAME */
00217 #endif /* HAVE_TM_ZONE */
00218         int precision, flags;
00219         char padding;
00220         enum {LEFT, CHCASE, LOWER, UPPER, LOCALE_O, LOCALE_E};
00221 #define BIT_OF(n) (1U<<(n))
00222 
00223         /* various tables, useful in North America */
00224         static const char days_l[][10] = {
00225                 "Sunday", "Monday", "Tuesday", "Wednesday",
00226                 "Thursday", "Friday", "Saturday",
00227         };
00228         static const char months_l[][10] = {
00229                 "January", "February", "March", "April",
00230                 "May", "June", "July", "August", "September",
00231                 "October", "November", "December",
00232         };
00233         static const char ampm[][3] = { "AM", "PM", };
00234 
00235         if (s == NULL || format == NULL || vtm == NULL || maxsize == 0)
00236                 return 0;
00237 
00238         /* quick check if we even need to bother */
00239         if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) {
00240         err:
00241                 errno = ERANGE;
00242                 return 0;
00243         }
00244 
00245 #ifndef POSIX_SEMANTICS
00246         if (first) {
00247                 tzset();
00248                 first = 0;
00249         }
00250 #else   /* POSIX_SEMANTICS */
00251         tz = getenv("TZ");
00252         if (first) {
00253                 if (tz != NULL) {
00254                         size_t tzlen = strlen(tz);
00255 
00256                         savetz = (char *) malloc(tzlen + 1);
00257                         if (savetz != NULL) {
00258                                 savetzlen = tzlen + 1;
00259                                 memcpy(savetz, tz, savetzlen);
00260                         }
00261                 }
00262                 tzset();
00263                 first = 0;
00264         }
00265         /* if we have a saved TZ, and it is different, recapture and reset */
00266         if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) {
00267                 size_t i = strlen(tz) + 1;
00268                 if (i > savetzlen) {
00269                         savetz = (char *) realloc(savetz, i);
00270                         if (savetz) {
00271                                 savetzlen = i;
00272                                 memcpy(savetz, tz, i);
00273                         }
00274                 } else
00275                         memcpy(savetz, tz, i);
00276                 tzset();
00277         }
00278 #endif  /* POSIX_SEMANTICS */
00279 
00280         for (; *format && s < endp - 1; format++) {
00281 #define FLAG_FOUND() do { \
00282                         if (precision > 0 || flags & (BIT_OF(LOCALE_E)|BIT_OF(LOCALE_O))) \
00283                                 goto unknown; \
00284                 } while (0)
00285 #define NEEDS(n) do if (s + (n) >= endp - 1) goto err; while (0)
00286 #define FILL_PADDING(i) do { \
00287         if (!(flags & BIT_OF(LEFT)) && precision > i) { \
00288                 NEEDS(precision); \
00289                 memset(s, padding ? padding : ' ', precision - i); \
00290                 s += precision - i; \
00291         } \
00292         else { \
00293                 NEEDS(i); \
00294         } \
00295 } while (0);
00296 #define FMT(def_pad, def_prec, fmt, val) \
00297                 do { \
00298                         int l; \
00299                         if (precision <= 0) precision = (def_prec); \
00300                         if (flags & BIT_OF(LEFT)) precision = 1; \
00301                         l = snprintf(s, endp - s, \
00302                                      ((padding == '0' || (!padding && def_pad == '0')) ? "%0*"fmt : "%*"fmt), \
00303                                      precision, val); \
00304                         if (l < 0) goto err; \
00305                         s += l; \
00306                 } while (0)
00307 #define STRFTIME(fmt) \
00308                 do { \
00309                         i = rb_strftime_with_timespec(s, endp - s, fmt, vtm, timev, ts, gmt); \
00310                         if (!i) return 0; \
00311                         if (precision > i) {\
00312                                 NEEDS(precision); \
00313                                 memmove(s + precision - i, s, i);\
00314                                 memset(s, padding ? padding : ' ', precision - i); \
00315                                 s += precision; \
00316                         }\
00317                         else s += i; \
00318                 } while (0)
00319 #define FMTV(def_pad, def_prec, fmt, val) \
00320                 do { \
00321                         VALUE tmp = (val); \
00322                         if (FIXNUM_P(tmp)) { \
00323                                 FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
00324                         } \
00325                         else { \
00326                                 VALUE args[2], result; \
00327                                 size_t l; \
00328                                 if (precision <= 0) precision = (def_prec); \
00329                                 if (flags & BIT_OF(LEFT)) precision = 1; \
00330                                 args[0] = INT2FIX(precision); \
00331                                 args[1] = val; \
00332                                 if (padding == '0' || (!padding && def_pad == '0')) \
00333                                         result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \
00334                                 else \
00335                                         result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \
00336                                 l = strlcpy(s, StringValueCStr(result), endp-s); \
00337                                 if ((size_t)(endp-s) <= l) \
00338                                         goto err; \
00339                                 s += l; \
00340                         } \
00341                 } while (0)
00342 
00343                 if (*format != '%') {
00344                         *s++ = *format;
00345                         continue;
00346                 }
00347                 tp = tbuf;
00348                 sp = format;
00349                 precision = -1;
00350                 flags = 0;
00351                 padding = 0;
00352         again:
00353                 switch (*++format) {
00354                 case '\0':
00355                         format--;
00356                         goto unknown;
00357 
00358                 case '%':
00359                         FILL_PADDING(1);
00360                         *s++ = '%';
00361                         continue;
00362 
00363                 case 'a':       /* abbreviated weekday name */
00364                         if (flags & BIT_OF(CHCASE)) {
00365                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00366                                 flags |= BIT_OF(UPPER);
00367                         }
00368                         if (vtm->wday < 0 || vtm->wday > 6)
00369                                 i = 1, tp = "?";
00370                         else
00371                                 i = 3, tp = days_l[vtm->wday];
00372                         break;
00373 
00374                 case 'A':       /* full weekday name */
00375                         if (flags & BIT_OF(CHCASE)) {
00376                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00377                                 flags |= BIT_OF(UPPER);
00378                         }
00379                         if (vtm->wday < 0 || vtm->wday > 6)
00380                                 i = 1, tp = "?";
00381                         else
00382                                 i = strlen(tp = days_l[vtm->wday]);
00383                         break;
00384 
00385 #ifdef SYSV_EXT
00386                 case 'h':       /* abbreviated month name */
00387 #endif
00388                 case 'b':       /* abbreviated month name */
00389                         if (flags & BIT_OF(CHCASE)) {
00390                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00391                                 flags |= BIT_OF(UPPER);
00392                         }
00393                         if (vtm->mon < 1 || vtm->mon > 12)
00394                                 i = 1, tp = "?";
00395                         else
00396                                 i = 3, tp = months_l[vtm->mon-1];
00397                         break;
00398 
00399                 case 'B':       /* full month name */
00400                         if (flags & BIT_OF(CHCASE)) {
00401                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00402                                 flags |= BIT_OF(UPPER);
00403                         }
00404                         if (vtm->mon < 1 || vtm->mon > 12)
00405                                 i = 1, tp = "?";
00406                         else
00407                                 i = strlen(tp = months_l[vtm->mon-1]);
00408                         break;
00409 
00410                 case 'c':       /* appropriate date and time representation */
00411                         STRFTIME("%a %b %e %H:%M:%S %Y");
00412                         continue;
00413 
00414                 case 'd':       /* day of the month, 01 - 31 */
00415                         i = range(1, vtm->mday, 31);
00416                         FMT('0', 2, "d", (int)i);
00417                         continue;
00418 
00419                 case 'H':       /* hour, 24-hour clock, 00 - 23 */
00420                         i = range(0, vtm->hour, 23);
00421                         FMT('0', 2, "d", (int)i);
00422                         continue;
00423 
00424                 case 'I':       /* hour, 12-hour clock, 01 - 12 */
00425                         i = range(0, vtm->hour, 23);
00426                         if (i == 0)
00427                                 i = 12;
00428                         else if (i > 12)
00429                                 i -= 12;
00430                         FMT('0', 2, "d", (int)i);
00431                         continue;
00432 
00433                 case 'j':       /* day of the year, 001 - 366 */
00434                         FMT('0', 3, "d", vtm->yday);
00435                         continue;
00436 
00437                 case 'm':       /* month, 01 - 12 */
00438                         i = range(1, vtm->mon, 12);
00439                         FMT('0', 2, "d", (int)i);
00440                         continue;
00441 
00442                 case 'M':       /* minute, 00 - 59 */
00443                         i = range(0, vtm->min, 59);
00444                         FMT('0', 2, "d", (int)i);
00445                         continue;
00446 
00447                 case 'p':       /* AM or PM based on 12-hour clock */
00448                 case 'P':       /* am or pm based on 12-hour clock */
00449                         if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
00450                             (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
00451                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
00452                                 flags |= BIT_OF(LOWER);
00453                         }
00454                         i = range(0, vtm->hour, 23);
00455                         if (i < 12)
00456                                 tp = ampm[0];
00457                         else
00458                                 tp = ampm[1];
00459                         i = 2;
00460                         break;
00461 
00462                 case 's':
00463                         if (ts) {
00464                                 time_t sec = ts->tv_sec;
00465                                 if (~(time_t)0 <= 0)
00466                                     FMT('0', 1, PRI_TIMET_PREFIX"d", sec);
00467                                 else
00468                                     FMT('0', 1, PRI_TIMET_PREFIX"u", sec);
00469                         }
00470                         else {
00471                                 VALUE sec = div(timev, INT2FIX(1));
00472                                 FMTV('0', 1, "d", sec);
00473                         }
00474                         continue;
00475 
00476                 case 'S':       /* second, 00 - 60 */
00477                         i = range(0, vtm->sec, 60);
00478                         FMT('0', 2, "d", (int)i);
00479                         continue;
00480 
00481                 case 'U':       /* week of year, Sunday is first day of week */
00482                         FMT('0', 2, "d", weeknumber_v(vtm, 0));
00483                         continue;
00484 
00485                 case 'w':       /* weekday, Sunday == 0, 0 - 6 */
00486                         i = range(0, vtm->wday, 6);
00487                         FMT('0', 1, "d", (int)i);
00488                         continue;
00489 
00490                 case 'W':       /* week of year, Monday is first day of week */
00491                         FMT('0', 2, "d", weeknumber_v(vtm, 1));
00492                         continue;
00493 
00494                 case 'x':       /* appropriate date representation */
00495                         STRFTIME("%m/%d/%y");
00496                         continue;
00497 
00498                 case 'X':       /* appropriate time representation */
00499                         STRFTIME("%H:%M:%S");
00500                         continue;
00501 
00502                 case 'y':       /* year without a century, 00 - 99 */
00503                         i = NUM2INT(mod(vtm->year, INT2FIX(100)));
00504                         FMT('0', 2, "d", (int)i);
00505                         continue;
00506 
00507                 case 'Y':       /* year with century */
00508                         if (FIXNUM_P(vtm->year)) {
00509                             long y = FIX2LONG(vtm->year);
00510                             FMT('0', 0 <= y ? 4 : 5, "ld", y);
00511                         }
00512                         else {
00513                             FMTV('0', 4, "d", vtm->year);
00514                         }
00515                         continue;
00516 
00517 #ifdef MAILHEADER_EXT
00518                 /*
00519                  * From: Chip Rosenthal <chip@chinacat.unicom.com>
00520                  * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST)
00521                  *
00522                  * Warning: the %z [code] is implemented by inspecting the
00523                  * timezone name conditional compile settings, and
00524                  * inferring a method to get timezone offsets. I've tried
00525                  * this code on a couple of machines, but I don't doubt
00526                  * there is some system out there that won't like it.
00527                  * Maybe the easiest thing to do would be to bracket this
00528                  * with an #ifdef that can turn it off. The %z feature
00529                  * would be an admittedly obscure one that most folks can
00530                  * live without, but it would be a great help to those of
00531                  * us that muck around with various message processors.
00532                  */
00533                 case 'z':       /* time zone offset east of GMT e.g. -0600 */
00534                         if (precision < 4) precision = 4;
00535                         NEEDS(precision + 1);
00536                         if (gmt) {
00537                                 off = 0;
00538                         }
00539                         else {
00540                                 off = NUM2LONG(rb_funcall(quo(vtm->utc_offset, INT2FIX(60)), rb_intern("round"), 0));
00541 #if 0
00542 #ifdef HAVE_TM_NAME
00543                                 /*
00544                                  * Systems with tm_name probably have tm_tzadj as
00545                                  * secs west of GMT.  Convert to mins east of GMT.
00546                                  */
00547                                 off = -timeptr->tm_tzadj / 60;
00548 #else /* !HAVE_TM_NAME */
00549 #ifdef HAVE_TM_ZONE
00550                                 /*
00551                                  * Systems with tm_zone probably have tm_gmtoff as
00552                                  * secs east of GMT.  Convert to mins east of GMT.
00553                                  */
00554                                 off = timeptr->tm_gmtoff / 60;
00555 #else /* !HAVE_TM_ZONE */
00556 #if HAVE_VAR_TIMEZONE
00557 #if HAVE_VAR_ALTZONE
00558                                 off = -(daylight ? timezone : altzone) / 60;
00559 #else
00560                                 off = -timezone / 60;
00561 #endif
00562 #else /* !HAVE_VAR_TIMEZONE */
00563 #ifdef HAVE_GETTIMEOFDAY
00564                                 gettimeofday(&tv, &zone);
00565                                 off = -zone.tz_minuteswest;
00566 #else
00567                                 /* no timezone info, then calc by myself */
00568                                 {
00569                                         struct tm utc;
00570                                         time_t now;
00571                                         time(&now);
00572                                         utc = *gmtime(&now);
00573                                         off = (long)((now - mktime(&utc)) / 60);
00574                                 }
00575 #endif
00576 #endif /* !HAVE_VAR_TIMEZONE */
00577 #endif /* !HAVE_TM_ZONE */
00578 #endif /* !HAVE_TM_NAME */
00579 #endif /* 0 */
00580                         }
00581                         if (off < 0) {
00582                                 off = -off;
00583                                 *s++ = '-';
00584                         } else {
00585                                 *s++ = '+';
00586                         }
00587                         off = off/60*100 + off%60;
00588                         i = snprintf(s, endp - s, (padding == ' ' ? "%*ld" : "%.*ld"),
00589                                      precision - (precision > 4), off);
00590                         if (i < 0) goto err;
00591                         s += i;
00592                         continue;
00593 #endif /* MAILHEADER_EXT */
00594 
00595                 case 'Z':       /* time zone name or abbreviation */
00596                         if (flags & BIT_OF(CHCASE)) {
00597                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
00598                                 flags |= BIT_OF(LOWER);
00599                         }
00600                         if (gmt) {
00601                                 i = 3;
00602                                 tp = "UTC";
00603                                 break;
00604                         }
00605 #if 0
00606 #ifdef HAVE_TZNAME
00607                         i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */
00608                         tp = tzname[i];
00609 #else
00610 #ifdef HAVE_TM_ZONE
00611                         tp = timeptr->tm_zone;
00612 #else
00613 #ifdef HAVE_TM_NAME
00614                         tp = timeptr->tm_name;
00615 #else
00616 #ifdef HAVE_TIMEZONE
00617                         gettimeofday(& tv, & zone);
00618 #ifdef TIMEZONE_VOID
00619                         tp = timezone();
00620 #else
00621                         tp = timezone(zone.tz_minuteswest, timeptr->tm_isdst > 0);
00622 #endif /* TIMEZONE_VOID */
00623 #endif /* HAVE_TIMEZONE */
00624 #endif /* HAVE_TM_NAME */
00625 #endif /* HAVE_TM_ZONE */
00626 #endif /* HAVE_TZNAME */
00627 #endif /* 0 */
00628                         if (vtm->zone == NULL)
00629                             tp = "";
00630                         else
00631                             tp = vtm->zone;
00632                         i = strlen(tp);
00633                         break;
00634 
00635 #ifdef SYSV_EXT
00636                 case 'n':       /* same as \n */
00637                         FILL_PADDING(1);
00638                         *s++ = '\n';
00639                         continue;
00640 
00641                 case 't':       /* same as \t */
00642                         FILL_PADDING(1);
00643                         *s++ = '\t';
00644                         continue;
00645 
00646                 case 'D':       /* date as %m/%d/%y */
00647                         STRFTIME("%m/%d/%y");
00648                         continue;
00649 
00650                 case 'e':       /* day of month, blank padded */
00651                         FMT(' ', 2, "d", range(1, vtm->mday, 31));
00652                         continue;
00653 
00654                 case 'r':       /* time as %I:%M:%S %p */
00655                         STRFTIME("%I:%M:%S %p");
00656                         continue;
00657 
00658                 case 'R':       /* time as %H:%M */
00659                         STRFTIME("%H:%M");
00660                         continue;
00661 
00662                 case 'T':       /* time as %H:%M:%S */
00663                         STRFTIME("%H:%M:%S");
00664                         continue;
00665 #endif
00666 
00667 #ifdef SUNOS_EXT
00668                 case 'k':       /* hour, 24-hour clock, blank pad */
00669                         i = range(0, vtm->hour, 23);
00670                         FMT(' ', 2, "d", (int)i);
00671                         continue;
00672 
00673                 case 'l':       /* hour, 12-hour clock, 1 - 12, blank pad */
00674                         i = range(0, vtm->hour, 23);
00675                         if (i == 0)
00676                                 i = 12;
00677                         else if (i > 12)
00678                                 i -= 12;
00679                         FMT(' ', 2, "d", (int)i);
00680                         continue;
00681 #endif
00682 
00683 
00684 #ifdef VMS_EXT
00685                 case 'v':       /* date as dd-bbb-YYYY */
00686                         STRFTIME("%e-%^b-%4Y");
00687                         continue;
00688 #endif
00689 
00690 
00691 #ifdef POSIX2_DATE
00692                 case 'C':
00693                         FMTV('0', 2, "d", div(vtm->year, INT2FIX(100)));
00694                         continue;
00695 
00696                 case 'E':
00697                         /* POSIX locale extensions, ignored for now */
00698                         flags |= BIT_OF(LOCALE_E);
00699                         goto again;
00700                 case 'O':
00701                         /* POSIX locale extensions, ignored for now */
00702                         flags |= BIT_OF(LOCALE_O);
00703                         goto again;
00704 
00705                 case 'V':       /* week of year according ISO 8601 */
00706                         FMT('0', 2, "d", iso8601wknum_v(vtm));
00707                         continue;
00708 
00709                 case 'u':
00710                 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
00711                         FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday);
00712                         continue;
00713 #endif  /* POSIX2_DATE */
00714 
00715 #ifdef ISO_DATE_EXT
00716                 case 'G':
00717                 case 'g':
00718                         /*
00719                          * Year of ISO week.
00720                          *
00721                          * If it's December but the ISO week number is one,
00722                          * that week is in next year.
00723                          * If it's January but the ISO week number is 52 or
00724                          * 53, that week is in last year.
00725                          * Otherwise, it's this year.
00726                          */
00727                         {
00728                                 VALUE yv = vtm->year;
00729                                 w = iso8601wknum_v(vtm);
00730                                 if (vtm->mon == 12 && w == 1)
00731                                         yv = add(yv, INT2FIX(1));
00732                                 else if (vtm->mon == 1 && w >= 52)
00733                                         yv = sub(yv, INT2FIX(1));
00734 
00735                                 if (*format == 'G') {
00736                                         FMTV('0', 1, "d", yv);
00737                                 }
00738                                 else {
00739                                         yv = mod(yv, INT2FIX(100));
00740                                         y = FIX2LONG(yv);
00741                                         FMT('0', 2, "ld", y);
00742                                 }
00743                                 continue;
00744                         }
00745 
00746 #endif /* ISO_DATE_EXT */
00747 
00748 
00749                 case 'L':
00750                         w = 3;
00751                         goto subsec;
00752 
00753                 case 'N':
00754                         /*
00755                          * fractional second digits. default is 9 digits
00756                          * (nanosecond).
00757                          *
00758                          * %3N  millisecond (3 digits)
00759                          * %6N  microsecond (6 digits)
00760                          * %9N  nanosecond (9 digits)
00761                          */
00762                         w = 9;
00763                 subsec:
00764                         if (precision <= 0) {
00765                             precision = w;
00766                         }
00767                         NEEDS(precision);
00768 
00769                         if (ts) {
00770                                 long subsec = ts->tv_nsec;
00771                                 if (9 < precision) {
00772                                         snprintf(s, endp - s, "%09ld", subsec);
00773                                         memset(s+9, '0', precision-9);
00774                                         s += precision;
00775                                 }
00776                                 else {
00777                                         int i;
00778                                         for (i = 0; i < 9-precision; i++)
00779                                                 subsec /= 10;
00780                                         snprintf(s, endp - s, "%0*ld", precision, subsec);
00781                                         s += precision;
00782                                 }
00783                         }
00784                         else {
00785                                 VALUE subsec = mod(timev, INT2FIX(1));
00786                                 int ww;
00787                                 long n;
00788 
00789                                 ww = precision;
00790                                 while (9 <= ww) {
00791                                         subsec = mul(subsec, INT2FIX(1000000000));
00792                                         ww -= 9;
00793                                 }
00794                                 n = 1;
00795                                 for (; 0 < ww; ww--)
00796                                         n *= 10;
00797                                 if (n != 1)
00798                                         subsec = mul(subsec, INT2FIX(n));
00799                                 subsec = div(subsec, INT2FIX(1));
00800 
00801                                 if (FIXNUM_P(subsec)) {
00802                                         int l;
00803                                         l = snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
00804                                         s += precision;
00805                                 }
00806                                 else {
00807                                         VALUE args[2], result;
00808                                         size_t l;
00809                                         args[0] = INT2FIX(precision);
00810                                         args[1] = subsec;
00811                                         result = rb_str_format(2, args, rb_str_new2("%0*d"));
00812                                         l = strlcpy(s, StringValueCStr(result), endp-s);
00813                                         s += precision;
00814                                 }
00815                         }
00816                         continue;
00817 
00818                 case 'F':       /*  Equivalent to %Y-%m-%d */
00819                         STRFTIME("%Y-%m-%d");
00820                         continue;
00821 
00822                 case '-':
00823                         FLAG_FOUND();
00824                         flags |= BIT_OF(LEFT);
00825                         padding = precision = 0;
00826                         goto again;
00827 
00828                 case '^':
00829                         FLAG_FOUND();
00830                         flags |= BIT_OF(UPPER);
00831                         goto again;
00832 
00833                 case '#':
00834                         FLAG_FOUND();
00835                         flags |= BIT_OF(CHCASE);
00836                         goto again;
00837 
00838                 case '_':
00839                         FLAG_FOUND();
00840                         padding = ' ';
00841                         goto again;
00842 
00843                 case '0':
00844                         padding = '0';
00845                 case '1':  case '2': case '3': case '4':
00846                 case '5': case '6':  case '7': case '8': case '9':
00847                         {
00848                                 char *e;
00849                                 precision = (int)strtoul(format, &e, 10);
00850                                 format = e - 1;
00851                                 goto again;
00852                         }
00853 
00854                 default:
00855                 unknown:
00856                         i = format - sp + 1;
00857                         tp = sp;
00858                         precision = -1;
00859                         flags = 0;
00860                         padding = 0;
00861                         break;
00862                 }
00863                 if (i) {
00864                         FILL_PADDING(i);
00865                         memcpy(s, tp, i);
00866                         switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
00867                         case BIT_OF(UPPER):
00868                                 do {
00869                                         if (ISLOWER(*s)) *s = TOUPPER(*s);
00870                                 } while (s++, --i);
00871                                 break;
00872                         case BIT_OF(LOWER):
00873                                 do {
00874                                         if (ISUPPER(*s)) *s = TOLOWER(*s);
00875                                 } while (s++, --i);
00876                                 break;
00877                         default:
00878                                 s += i;
00879                                 break;
00880                         }
00881                 }
00882         }
00883         if (s >= endp) {
00884                 goto err;
00885         }
00886         if (*format == '\0') {
00887                 *s = '\0';
00888                 return (s - start);
00889         } else
00890                 return 0;
00891 }
00892 
00893 size_t
00894 rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm, VALUE timev, int gmt)
00895 {
00896     return rb_strftime_with_timespec(s, maxsize, format, vtm, timev, NULL, gmt);
00897 }
00898 
00899 size_t
00900 rb_strftime_timespec(char *s, size_t maxsize, const char *format, const struct vtm *vtm, struct timespec *ts, int gmt)
00901 {
00902     return rb_strftime_with_timespec(s, maxsize, format, vtm, Qnil, ts, gmt);
00903 }
00904 
00905 /* isleap --- is a year a leap year? */
00906 
00907 #ifndef __STDC__
00908 static int
00909 isleap(year)
00910 long year;
00911 #else
00912 static int
00913 isleap(long year)
00914 #endif
00915 {
00916         return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
00917 }
00918 
00919 
00920 static void
00921 vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
00922 {
00923     struct tm tm;
00924 
00925     /* for isleap() in iso8601wknum.  +100 is -1900 (mod 400). */
00926     tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100;
00927 
00928     tm.tm_mon = vtm->mon-1;
00929     tm.tm_mday = vtm->mday;
00930     tm.tm_hour = vtm->hour;
00931     tm.tm_min = vtm->min;
00932     tm.tm_sec = vtm->sec;
00933     tm.tm_wday = vtm->wday;
00934     tm.tm_yday = vtm->yday-1;
00935     tm.tm_isdst = vtm->isdst;
00936 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
00937     tm.tm_gmtoff = NUM2LONG(vtm->utc_offset);
00938 #endif
00939 #if defined(HAVE_TM_ZONE)
00940     tm.tm_zone = (char *)vtm->zone;
00941 #endif
00942     *result = tm;
00943 }
00944 
00945 #ifdef POSIX2_DATE
00946 /* iso8601wknum --- compute week number according to ISO 8601 */
00947 
00948 #ifndef __STDC__
00949 static int
00950 iso8601wknum(timeptr)
00951 const struct tm *timeptr;
00952 #else
00953 static int
00954 iso8601wknum(const struct tm *timeptr)
00955 #endif
00956 {
00957         /*
00958          * From 1003.2:
00959          *      If the week (Monday to Sunday) containing January 1
00960          *      has four or more days in the new year, then it is week 1;
00961          *      otherwise it is the highest numbered week of the previous
00962          *      year (52 or 53), and the next week is week 1.
00963          *
00964          * ADR: This means if Jan 1 was Monday through Thursday,
00965          *      it was week 1, otherwise week 52 or 53.
00966          *
00967          * XPG4 erroneously included POSIX.2 rationale text in the
00968          * main body of the standard. Thus it requires week 53.
00969          */
00970 
00971         int weeknum, jan1day;
00972 
00973         /* get week number, Monday as first day of the week */
00974         weeknum = weeknumber(timeptr, 1);
00975 
00976         /*
00977          * With thanks and tip of the hatlo to tml@tik.vtt.fi
00978          *
00979          * What day of the week does January 1 fall on?
00980          * We know that
00981          *      (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
00982          *              (timeptr->tm_wday - jan1.tm_wday) MOD 7
00983          * and that
00984          *      jan1.tm_yday == 0
00985          * and that
00986          *      timeptr->tm_wday MOD 7 == timeptr->tm_wday
00987          * from which it follows that. . .
00988          */
00989         jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
00990         if (jan1day < 0)
00991                 jan1day += 7;
00992 
00993         /*
00994          * If Jan 1 was a Monday through Thursday, it was in
00995          * week 1.  Otherwise it was last year's highest week, which is
00996          * this year's week 0.
00997          *
00998          * What does that mean?
00999          * If Jan 1 was Monday, the week number is exactly right, it can
01000          *      never be 0.
01001          * If it was Tuesday through Thursday, the weeknumber is one
01002          *      less than it should be, so we add one.
01003          * Otherwise, Friday, Saturday or Sunday, the week number is
01004          * OK, but if it is 0, it needs to be 52 or 53.
01005          */
01006         switch (jan1day) {
01007         case 1:         /* Monday */
01008                 break;
01009         case 2:         /* Tuesday */
01010         case 3:         /* Wednesday */
01011         case 4:         /* Thursday */
01012                 weeknum++;
01013                 break;
01014         case 5:         /* Friday */
01015         case 6:         /* Saturday */
01016         case 0:         /* Sunday */
01017                 if (weeknum == 0) {
01018 #ifdef USE_BROKEN_XPG4
01019                         /* XPG4 (as of March 1994) says 53 unconditionally */
01020                         weeknum = 53;
01021 #else
01022                         /* get week number of last week of last year */
01023                         struct tm dec31ly;      /* 12/31 last year */
01024                         dec31ly = *timeptr;
01025                         dec31ly.tm_year--;
01026                         dec31ly.tm_mon = 11;
01027                         dec31ly.tm_mday = 31;
01028                         dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
01029                         dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
01030                         weeknum = iso8601wknum(& dec31ly);
01031 #endif
01032                 }
01033                 break;
01034         }
01035 
01036         if (timeptr->tm_mon == 11) {
01037                 /*
01038                  * The last week of the year
01039                  * can be in week 1 of next year.
01040                  * Sigh.
01041                  *
01042                  * This can only happen if
01043                  *      M   T  W
01044                  *      29  30 31
01045                  *      30  31
01046                  *      31
01047                  */
01048                 int wday, mday;
01049 
01050                 wday = timeptr->tm_wday;
01051                 mday = timeptr->tm_mday;
01052                 if (   (wday == 1 && (mday >= 29 && mday <= 31))
01053                     || (wday == 2 && (mday == 30 || mday == 31))
01054                     || (wday == 3 &&  mday == 31))
01055                         weeknum = 1;
01056         }
01057 
01058         return weeknum;
01059 }
01060 
01061 static int
01062 iso8601wknum_v(const struct vtm *vtm)
01063 {
01064         struct tm tm;
01065         vtm2tm_noyear(vtm, &tm);
01066         return iso8601wknum(&tm);
01067 }
01068 
01069 #endif
01070 
01071 /* weeknumber --- figure how many weeks into the year */
01072 
01073 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
01074 
01075 #ifndef __STDC__
01076 static int
01077 weeknumber(timeptr, firstweekday)
01078 const struct tm *timeptr;
01079 int firstweekday;
01080 #else
01081 static int
01082 weeknumber(const struct tm *timeptr, int firstweekday)
01083 #endif
01084 {
01085         int wday = timeptr->tm_wday;
01086         int ret;
01087 
01088         if (firstweekday == 1) {
01089                 if (wday == 0)  /* sunday */
01090                         wday = 6;
01091                 else
01092                         wday--;
01093         }
01094         ret = ((timeptr->tm_yday + 7 - wday) / 7);
01095         if (ret < 0)
01096                 ret = 0;
01097         return ret;
01098 }
01099 
01100 static int
01101 weeknumber_v(const struct vtm *vtm, int firstweekday)
01102 {
01103         struct tm tm;
01104         vtm2tm_noyear(vtm, &tm);
01105         return weeknumber(&tm, firstweekday);
01106 }
01107 
01108 #if 0
01109 /* ADR --- I'm loathe to mess with ado's code ... */
01110 
01111 Date:         Wed, 24 Apr 91 20:54:08 MDT
01112 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
01113 To: arnold@audiofax.com
01114 
01115 Hi Arnold,
01116 in a process of fixing of strftime() in libraries on Atari ST I grabbed
01117 some pieces of code from your own strftime.  When doing that it came
01118 to mind that your weeknumber() function compiles a little bit nicer
01119 in the following form:
01120 /*
01121  * firstweekday is 0 if starting in Sunday, non-zero if in Monday
01122  */
01123 {
01124     return (timeptr->tm_yday - timeptr->tm_wday +
01125             (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
01126 }
01127 How nicer it depends on a compiler, of course, but always a tiny bit.
01128 
01129    Cheers,
01130    Michal
01131    ntomczak@vm.ucs.ualberta.ca
01132 #endif
01133 
01134 #ifdef  TEST_STRFTIME
01135 
01136 /*
01137  * NAME:
01138  *      tst
01139  *
01140  * SYNOPSIS:
01141  *      tst
01142  *
01143  * DESCRIPTION:
01144  *      "tst" is a test driver for the function "strftime".
01145  *
01146  * OPTIONS:
01147  *      None.
01148  *
01149  * AUTHOR:
01150  *      Karl Vogel
01151  *      Control Data Systems, Inc.
01152  *      vogelke@c-17igp.wpafb.af.mil
01153  *
01154  * BUGS:
01155  *      None noticed yet.
01156  *
01157  * COMPILE:
01158  *      cc -o tst -DTEST_STRFTIME strftime.c
01159  */
01160 
01161 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
01162 
01163 #ifndef NULL
01164 #include        <stdio.h>
01165 #endif
01166 #include        <sys/time.h>
01167 #include        <string.h>
01168 
01169 #define         MAXTIME         132
01170 
01171 /*
01172  * Array of time formats.
01173  */
01174 
01175 static char *array[] =
01176 {
01177         "(%%A)      full weekday name, var length (Sunday..Saturday)  %A",
01178         "(%%B)       full month name, var length (January..December)  %B",
01179         "(%%C)                                               Century  %C",
01180         "(%%D)                                       date (%%m/%%d/%%y)  %D",
01181         "(%%E)                           Locale extensions (ignored)  %E",
01182         "(%%H)                          hour (24-hour clock, 00..23)  %H",
01183         "(%%I)                          hour (12-hour clock, 01..12)  %I",
01184         "(%%M)                                       minute (00..59)  %M",
01185         "(%%O)                           Locale extensions (ignored)  %O",
01186         "(%%R)                                 time, 24-hour (%%H:%%M)  %R",
01187         "(%%S)                                       second (00..60)  %S",
01188         "(%%T)                              time, 24-hour (%%H:%%M:%%S)  %T",
01189         "(%%U)    week of year, Sunday as first day of week (00..53)  %U",
01190         "(%%V)                    week of year according to ISO 8601  %V",
01191         "(%%W)    week of year, Monday as first day of week (00..53)  %W",
01192         "(%%X)     appropriate locale time representation (%H:%M:%S)  %X",
01193         "(%%Y)                           year with century (1970...)  %Y",
01194         "(%%Z) timezone (EDT), or blank if timezone not determinable  %Z",
01195         "(%%a)          locale's abbreviated weekday name (Sun..Sat)  %a",
01196         "(%%b)            locale's abbreviated month name (Jan..Dec)  %b",
01197         "(%%c)           full date (Sat Nov  4 12:02:33 1989)%n%t%t%t  %c",
01198         "(%%d)                             day of the month (01..31)  %d",
01199         "(%%e)               day of the month, blank-padded ( 1..31)  %e",
01200         "(%%h)                                should be same as (%%b)  %h",
01201         "(%%j)                            day of the year (001..366)  %j",
01202         "(%%k)               hour, 24-hour clock, blank pad ( 0..23)  %k",
01203         "(%%l)               hour, 12-hour clock, blank pad ( 1..12)  %l",
01204         "(%%m)                                        month (01..12)  %m",
01205         "(%%p)              locale's AM or PM based on 12-hour clock  %p",
01206         "(%%r)                   time, 12-hour (same as %%I:%%M:%%S %%p)  %r",
01207         "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7]   %u",
01208         "(%%v)                                VMS date (dd-bbb-YYYY)  %v",
01209         "(%%w)                       day of week (0..6, Sunday == 0)  %w",
01210         "(%%x)                appropriate locale date representation  %x",
01211         "(%%y)                      last two digits of year (00..99)  %y",
01212         "(%%z)      timezone offset east of GMT as HHMM (e.g. -0500)  %z",
01213         (char *) NULL
01214 };
01215 
01216 /* main routine. */
01217 
01218 int
01219 main(argc, argv)
01220 int argc;
01221 char **argv;
01222 {
01223         long time();
01224 
01225         char *next;
01226         char string[MAXTIME];
01227 
01228         int k;
01229         int length;
01230 
01231         struct tm *tm;
01232 
01233         long clock;
01234 
01235         /* Call the function. */
01236 
01237         clock = time((long *) 0);
01238         tm = localtime(&clock);
01239 
01240         for (k = 0; next = array[k]; k++) {
01241                 length = strftime(string, MAXTIME, next, tm);
01242                 printf("%s\n", string);
01243         }
01244 
01245         exit(0);
01246 }
01247 #endif  /* TEST_STRFTIME */
01248 

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