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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                                 memmove(s + precision - i, s, i);\
    00313                                 memset(s, padding ? padding : ' ', precision - i); \
    00314                                 s += precision; \
    00315                         }\
    00316                         else s += i; \
    00317                 } while (0)
    00318 #define FMTV(def_pad, def_prec, fmt, val) \
    00319                 do { \
    00320                         VALUE tmp = (val); \
    00321                         if (FIXNUM_P(tmp)) { \
    00322                                 FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
    00323                         } \
    00324                         else { \
    00325                                 VALUE args[2], result; \
    00326                                 size_t l; \
    00327                                 if (precision <= 0) precision = (def_prec); \
    00328                                 if (flags & BIT_OF(LEFT)) precision = 1; \
    00329                                 args[0] = INT2FIX(precision); \
    00330                                 args[1] = val; \
    00331                                 if (padding == '0' || (!padding && def_pad == '0')) \
    00332                                         result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \
    00333                                 else \
    00334                                         result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \
    00335                                 l = strlcpy(s, StringValueCStr(result), endp-s); \
    00336                                 if ((size_t)(endp-s) <= l) \
    00337                                         goto err; \
    00338                                 s += l; \
    00339                         } \
    00340                 } while (0)
    00341
    00342                 if (*format != '%') {
    00343                         *s++ = *format;
    00344                         continue;
    00345                 }
    00346                 tp = tbuf;
    00347                 sp = format;
    00348                 precision = -1;
    00349                 flags = 0;
    00350                 padding = 0;
    00351         again:
    00352                 switch (*++format) {
    00353                 case '\0':
    00354                         format--;
    00355                         goto unknown;
    00356
    00357                 case '%':
    00358                         FILL_PADDING(1);
    00359                         *s++ = '%';
    00360                         continue;
    00361
    00362                 case 'a':       /* abbreviated weekday name */
    00363                         if (flags & BIT_OF(CHCASE)) {
    00364                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
    00365                                 flags |= BIT_OF(UPPER);
    00366                         }
    00367                         if (vtm->wday < 0 || vtm->wday > 6)
    00368                                 i = 1, tp = "?";
    00369                         else
    00370                                 i = 3, tp = days_l[vtm->wday];
    00371                         break;
    00372
    00373                 case 'A':       /* full weekday name */
    00374                         if (flags & BIT_OF(CHCASE)) {
    00375                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
    00376                                 flags |= BIT_OF(UPPER);
    00377                         }
    00378                         if (vtm->wday < 0 || vtm->wday > 6)
    00379                                 i = 1, tp = "?";
    00380                         else
    00381                                 i = strlen(tp = days_l[vtm->wday]);
    00382                         break;
    00383
    00384 #ifdef SYSV_EXT
    00385                 case 'h':       /* abbreviated month name */
    00386 #endif
    00387                 case 'b':       /* abbreviated month name */
    00388                         if (flags & BIT_OF(CHCASE)) {
    00389                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
    00390                                 flags |= BIT_OF(UPPER);
    00391                         }
    00392                         if (vtm->mon < 1 || vtm->mon > 12)
    00393                                 i = 1, tp = "?";
    00394                         else
    00395                                 i = 3, tp = months_l[vtm->mon-1];
    00396                         break;
    00397
    00398                 case 'B':       /* full month name */
    00399                         if (flags & BIT_OF(CHCASE)) {
    00400                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
    00401                                 flags |= BIT_OF(UPPER);
    00402                         }
    00403                         if (vtm->mon < 1 || vtm->mon > 12)
    00404                                 i = 1, tp = "?";
    00405                         else
    00406                                 i = strlen(tp = months_l[vtm->mon-1]);
    00407                         break;
    00408
    00409                 case 'c':       /* appropriate date and time representation */
    00410                         STRFTIME("%a %b %e %H:%M:%S %Y");
    00411                         continue;
    00412
    00413                 case 'd':       /* day of the month, 01 - 31 */
    00414                         i = range(1, vtm->mday, 31);
    00415                         FMT('0', 2, "d", (int)i);
    00416                         continue;
    00417
    00418                 case 'H':       /* hour, 24-hour clock, 00 - 23 */
    00419                         i = range(0, vtm->hour, 23);
    00420                         FMT('0', 2, "d", (int)i);
    00421                         continue;
    00422
    00423                 case 'I':       /* hour, 12-hour clock, 01 - 12 */
    00424                         i = range(0, vtm->hour, 23);
    00425                         if (i == 0)
    00426                                 i = 12;
    00427                         else if (i > 12)
    00428                                 i -= 12;
    00429                         FMT('0', 2, "d", (int)i);
    00430                         continue;
    00431
    00432                 case 'j':       /* day of the year, 001 - 366 */
    00433                         FMT('0', 3, "d", vtm->yday);
    00434                         continue;
    00435
    00436                 case 'm':       /* month, 01 - 12 */
    00437                         i = range(1, vtm->mon, 12);
    00438                         FMT('0', 2, "d", (int)i);
    00439                         continue;
    00440
    00441                 case 'M':       /* minute, 00 - 59 */
    00442                         i = range(0, vtm->min, 59);
    00443                         FMT('0', 2, "d", (int)i);
    00444                         continue;
    00445
    00446                 case 'p':       /* AM or PM based on 12-hour clock */
    00447                 case 'P':       /* am or pm based on 12-hour clock */
    00448                         if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
    00449                             (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
    00450                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
    00451                                 flags |= BIT_OF(LOWER);
    00452                         }
    00453                         i = range(0, vtm->hour, 23);
    00454                         if (i < 12)
    00455                                 tp = ampm[0];
    00456                         else
    00457                                 tp = ampm[1];
    00458                         i = 2;
    00459                         break;
    00460
    00461                 case 's':
    00462                         if (ts) {
    00463                                 time_t sec = ts->tv_sec;
    00464                                 if (~(time_t)0 <= 0)
    00465                                     FMT('0', 1, PRI_TIMET_PREFIX"d", sec);
    00466                                 else
    00467                                     FMT('0', 1, PRI_TIMET_PREFIX"u", sec);
    00468                         }
    00469                         else {
    00470                                 VALUE sec = div(timev, INT2FIX(1));
    00471                                 FMTV('0', 1, "d", sec);
    00472                         }
    00473                         continue;
    00474
    00475                 case 'S':       /* second, 00 - 60 */
    00476                         i = range(0, vtm->sec, 60);
    00477                         FMT('0', 2, "d", (int)i);
    00478                         continue;
    00479
    00480                 case 'U':       /* week of year, Sunday is first day of week */
    00481                         FMT('0', 2, "d", weeknumber_v(vtm, 0));
    00482                         continue;
    00483
    00484                 case 'w':       /* weekday, Sunday == 0, 0 - 6 */
    00485                         i = range(0, vtm->wday, 6);
    00486                         FMT('0', 1, "d", (int)i);
    00487                         continue;
    00488
    00489                 case 'W':       /* week of year, Monday is first day of week */
    00490                         FMT('0', 2, "d", weeknumber_v(vtm, 1));
    00491                         continue;
    00492
    00493                 case 'x':       /* appropriate date representation */
    00494                         STRFTIME("%m/%d/%y");
    00495                         continue;
    00496
    00497                 case 'X':       /* appropriate time representation */
    00498                         STRFTIME("%H:%M:%S");
    00499                         continue;
    00500
    00501                 case 'y':       /* year without a century, 00 - 99 */
    00502                         i = NUM2INT(mod(vtm->year, INT2FIX(100)));
    00503                         FMT('0', 2, "d", (int)i);
    00504                         continue;
    00505
    00506                 case 'Y':       /* year with century */
    00507                         if (FIXNUM_P(vtm->year)) {
    00508                             long y = FIX2LONG(vtm->year);
    00509                             FMT('0', 0 <= y ? 4 : 5, "ld", y);
    00510                         }
    00511                         else {
    00512                             FMTV('0', 4, "d", vtm->year);
    00513                         }
    00514                         continue;
    00515
    00516 #ifdef MAILHEADER_EXT
    00517                 /*
    00518                  * From: Chip Rosenthal <chip@chinacat.unicom.com>
    00519                  * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST)
    00520                  *
    00521                  * Warning: the %z [code] is implemented by inspecting the
    00522                  * timezone name conditional compile settings, and
    00523                  * inferring a method to get timezone offsets. I've tried
    00524                  * this code on a couple of machines, but I don't doubt
    00525                  * there is some system out there that won't like it.
    00526                  * Maybe the easiest thing to do would be to bracket this
    00527                  * with an #ifdef that can turn it off. The %z feature
    00528                  * would be an admittedly obscure one that most folks can
    00529                  * live without, but it would be a great help to those of
    00530                  * us that muck around with various message processors.
    00531                  */
    00532                 case 'z':       /* time zone offset east of GMT e.g. -0600 */
    00533                         if (precision < 4) precision = 4;
    00534                         NEEDS(precision + 1);
    00535                         if (gmt) {
    00536                                 off = 0;
    00537                         }
    00538                         else {
    00539                                 off = NUM2LONG(rb_funcall(quo(vtm->utc_offset, INT2FIX(60)), rb_intern("round"), 0));
    00540 #if 0
    00541 #ifdef HAVE_TM_NAME
    00542                                 /*
    00543                                  * Systems with tm_name probably have tm_tzadj as
    00544                                  * secs west of GMT.  Convert to mins east of GMT.
    00545                                  */
    00546                                 off = -timeptr->tm_tzadj / 60;
    00547 #else /* !HAVE_TM_NAME */
    00548 #ifdef HAVE_TM_ZONE
    00549                                 /*
    00550                                  * Systems with tm_zone probably have tm_gmtoff as
    00551                                  * secs east of GMT.  Convert to mins east of GMT.
    00552                                  */
    00553                                 off = timeptr->tm_gmtoff / 60;
    00554 #else /* !HAVE_TM_ZONE */
    00555 #if HAVE_VAR_TIMEZONE
    00556 #if HAVE_VAR_ALTZONE
    00557                                 off = -(daylight ? timezone : altzone) / 60;
    00558 #else
    00559                                 off = -timezone / 60;
    00560 #endif
    00561 #else /* !HAVE_VAR_TIMEZONE */
    00562 #ifdef HAVE_GETTIMEOFDAY
    00563                                 gettimeofday(&tv, &zone);
    00564                                 off = -zone.tz_minuteswest;
    00565 #else
    00566                                 /* no timezone info, then calc by myself */
    00567                                 {
    00568                                         struct tm utc;
    00569                                         time_t now;
    00570                                         time(&now);
    00571                                         utc = *gmtime(&now);
    00572                                         off = (long)((now - mktime(&utc)) / 60);
    00573                                 }
    00574 #endif
    00575 #endif /* !HAVE_VAR_TIMEZONE */
    00576 #endif /* !HAVE_TM_ZONE */
    00577 #endif /* !HAVE_TM_NAME */
    00578 #endif /* 0 */
    00579                         }
    00580                         if (off < 0) {
    00581                                 off = -off;
    00582                                 *s++ = '-';
    00583                         } else {
    00584                                 *s++ = '+';
    00585                         }
    00586                         off = off/60*100 + off%60;
    00587                         i = snprintf(s, endp - s, (padding == ' ' ? "%*ld" : "%.*ld"),
    00588                                      precision - (precision > 4), off);
    00589                         if (i < 0) goto err;
    00590                         s += i;
    00591                         continue;
    00592 #endif /* MAILHEADER_EXT */
    00593
    00594                 case 'Z':       /* time zone name or abbreviation */
    00595                         if (flags & BIT_OF(CHCASE)) {
    00596                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
    00597                                 flags |= BIT_OF(LOWER);
    00598                         }
    00599                         if (gmt) {
    00600                                 i = 3;
    00601                                 tp = "UTC";
    00602                                 break;
    00603                         }
    00604 #if 0
    00605 #ifdef HAVE_TZNAME
    00606                         i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */
    00607                         tp = tzname[i];
    00608 #else
    00609 #ifdef HAVE_TM_ZONE
    00610                         tp = timeptr->tm_zone;
    00611 #else
    00612 #ifdef HAVE_TM_NAME
    00613                         tp = timeptr->tm_name;
    00614 #else
    00615 #ifdef HAVE_TIMEZONE
    00616                         gettimeofday(& tv, & zone);
    00617 #ifdef TIMEZONE_VOID
    00618                         tp = timezone();
    00619 #else
    00620                         tp = timezone(zone.tz_minuteswest, timeptr->tm_isdst > 0);
    00621 #endif /* TIMEZONE_VOID */
    00622 #endif /* HAVE_TIMEZONE */
    00623 #endif /* HAVE_TM_NAME */
    00624 #endif /* HAVE_TM_ZONE */
    00625 #endif /* HAVE_TZNAME */
    00626 #endif /* 0 */
    00627                         if (vtm->zone == NULL)
    00628                             tp = "";
    00629                         else
    00630                             tp = vtm->zone;
    00631                         i = strlen(tp);
    00632                         break;
    00633
    00634 #ifdef SYSV_EXT
    00635                 case 'n':       /* same as \n */
    00636                         FILL_PADDING(1);
    00637                         *s++ = '\n';
    00638                         continue;
    00639
    00640                 case 't':       /* same as \t */
    00641                         FILL_PADDING(1);
    00642                         *s++ = '\t';
    00643                         continue;
    00644
    00645                 case 'D':       /* date as %m/%d/%y */
    00646                         STRFTIME("%m/%d/%y");
    00647                         continue;
    00648
    00649                 case 'e':       /* day of month, blank padded */
    00650                         FMT(' ', 2, "d", range(1, vtm->mday, 31));
    00651                         continue;
    00652
    00653                 case 'r':       /* time as %I:%M:%S %p */
    00654                         STRFTIME("%I:%M:%S %p");
    00655                         continue;
    00656
    00657                 case 'R':       /* time as %H:%M */
    00658                         STRFTIME("%H:%M");
    00659                         continue;
    00660
    00661                 case 'T':       /* time as %H:%M:%S */
    00662                         STRFTIME("%H:%M:%S");
    00663                         continue;
    00664 #endif
    00665
    00666 #ifdef SUNOS_EXT
    00667                 case 'k':       /* hour, 24-hour clock, blank pad */
    00668                         i = range(0, vtm->hour, 23);
    00669                         FMT(' ', 2, "d", (int)i);
    00670                         continue;
    00671
    00672                 case 'l':       /* hour, 12-hour clock, 1 - 12, blank pad */
    00673                         i = range(0, vtm->hour, 23);
    00674                         if (i == 0)
    00675                                 i = 12;
    00676                         else if (i > 12)
    00677                                 i -= 12;
    00678                         FMT(' ', 2, "d", (int)i);
    00679                         continue;
    00680 #endif
    00681
    00682
    00683 #ifdef VMS_EXT
    00684                 case 'v':       /* date as dd-bbb-YYYY */
    00685                         STRFTIME("%e-%^b-%4Y");
    00686                         continue;
    00687 #endif
    00688
    00689
    00690 #ifdef POSIX2_DATE
    00691                 case 'C':
    00692                         FMTV('0', 2, "d", div(vtm->year, INT2FIX(100)));
    00693                         continue;
    00694
    00695                 case 'E':
    00696                         /* POSIX locale extensions, ignored for now */
    00697                         flags |= BIT_OF(LOCALE_E);
    00698                         goto again;
    00699                 case 'O':
    00700                         /* POSIX locale extensions, ignored for now */
    00701                         flags |= BIT_OF(LOCALE_O);
    00702                         goto again;
    00703
    00704                 case 'V':       /* week of year according ISO 8601 */
    00705                         FMT('0', 2, "d", iso8601wknum_v(vtm));
    00706                         continue;
    00707
    00708                 case 'u':
    00709                 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
    00710                         FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday);
    00711                         continue;
    00712 #endif  /* POSIX2_DATE */
    00713
    00714 #ifdef ISO_DATE_EXT
    00715                 case 'G':
    00716                 case 'g':
    00717                         /*
    00718                          * Year of ISO week.
    00719                          *
    00720                          * If it's December but the ISO week number is one,
    00721                          * that week is in next year.
    00722                          * If it's January but the ISO week number is 52 or
    00723                          * 53, that week is in last year.
    00724                          * Otherwise, it's this year.
    00725                          */
    00726                         {
    00727                                 VALUE yv = vtm->year;
    00728                                 w = iso8601wknum_v(vtm);
    00729                                 if (vtm->mon == 12 && w == 1)
    00730                                         yv = add(yv, INT2FIX(1));
    00731                                 else if (vtm->mon == 1 && w >= 52)
    00732                                         yv = sub(yv, INT2FIX(1));
    00733
    00734                                 if (*format == 'G') {
    00735                                         FMTV('0', 1, "d", yv);
    00736                                 }
    00737                                 else {
    00738                                         yv = mod(yv, INT2FIX(100));
    00739                                         y = FIX2LONG(yv);
    00740                                         FMT('0', 2, "ld", y);
    00741                                 }
    00742                                 continue;
    00743                         }
    00744
    00745 #endif /* ISO_DATE_EXT */
    00746
    00747
    00748                 case 'L':
    00749                         w = 3;
    00750                         goto subsec;
    00751
    00752                 case 'N':
    00753                         /*
    00754                          * fractional second digits. default is 9 digits
    00755                          * (nanosecond).
    00756                          *
    00757                          * %3N  millisecond (3 digits)
    00758                          * %6N  microsecond (6 digits)
    00759                          * %9N  nanosecond (9 digits)
    00760                          */
    00761                         w = 9;
    00762                 subsec:
    00763                         if (precision <= 0) {
    00764                             precision = w;
    00765                         }
    00766                         NEEDS(precision);
    00767
    00768                         if (ts) {
    00769                                 long subsec = ts->tv_nsec;
    00770                                 if (9 < precision) {
    00771                                         snprintf(s, endp - s, "%09ld", subsec);
    00772                                         memset(s+9, '0', precision-9);
    00773                                         s += precision;
    00774                                 }
    00775                                 else {
    00776                                         int i;
    00777                                         for (i = 0; i < 9-precision; i++)
    00778                                                 subsec /= 10;
    00779                                         snprintf(s, endp - s, "%0*ld", precision, subsec);
    00780                                         s += precision;
    00781                                 }
    00782                         }
    00783                         else {
    00784                                 VALUE subsec = mod(timev, INT2FIX(1));
    00785                                 int ww;
    00786                                 long n;
    00787
    00788                                 ww = precision;
    00789                                 while (9 <= ww) {
    00790                                         subsec = mul(subsec, INT2FIX(1000000000));
    00791                                         ww -= 9;
    00792                                 }
    00793                                 n = 1;
    00794                                 for (; 0 < ww; ww--)
    00795                                         n *= 10;
    00796                                 if (n != 1)
    00797                                         subsec = mul(subsec, INT2FIX(n));
    00798                                 subsec = div(subsec, INT2FIX(1));
    00799
    00800                                 if (FIXNUM_P(subsec)) {
    00801                                         int l;
    00802                                         l = snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
    00803                                         s += precision;
    00804                                 }
    00805                                 else {
    00806                                         VALUE args[2], result;
    00807                                         size_t l;
    00808                                         args[0] = INT2FIX(precision);
    00809                                         args[1] = subsec;
    00810                                         result = rb_str_format(2, args, rb_str_new2("%0*d"));
    00811                                         l = strlcpy(s, StringValueCStr(result), endp-s);
    00812                                         s += precision;
    00813                                 }
    00814                         }
    00815                         continue;
    00816
    00817                 case 'F':       /*  Equivalent to %Y-%m-%d */
    00818                         STRFTIME("%Y-%m-%d");
    00819                         continue;
    00820
    00821                 case '-':
    00822                         FLAG_FOUND();
    00823                         flags |= BIT_OF(LEFT);
    00824                         padding = precision = 0;
    00825                         goto again;
    00826
    00827                 case '^':
    00828                         FLAG_FOUND();
    00829                         flags |= BIT_OF(UPPER);
    00830                         goto again;
    00831
    00832                 case '#':
    00833                         FLAG_FOUND();
    00834                         flags |= BIT_OF(CHCASE);
    00835                         goto again;
    00836
    00837                 case '_':
    00838                         FLAG_FOUND();
    00839                         padding = ' ';
    00840                         goto again;
    00841
    00842                 case '0':
    00843                         padding = '0';
    00844                 case '1':  case '2': case '3': case '4':
    00845                 case '5': case '6':  case '7': case '8': case '9':
    00846                         {
    00847                                 char *e;
    00848                                 precision = (int)strtoul(format, &e, 10);
    00849                                 format = e - 1;
    00850                                 goto again;
    00851                         }
    00852
    00853                 default:
    00854                 unknown:
    00855                         i = format - sp + 1;
    00856                         tp = sp;
    00857                         precision = -1;
    00858                         flags = 0;
    00859                         padding = 0;
    00860                         break;
    00861                 }
    00862                 if (i) {
    00863                         FILL_PADDING(i);
    00864                         memcpy(s, tp, i);
    00865                         switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
    00866                         case BIT_OF(UPPER):
    00867                                 do {
    00868                                         if (ISLOWER(*s)) *s = TOUPPER(*s);
    00869                                 } while (s++, --i);
    00870                                 break;
    00871                         case BIT_OF(LOWER):
    00872                                 do {
    00873                                         if (ISUPPER(*s)) *s = TOLOWER(*s);
    00874                                 } while (s++, --i);
    00875                                 break;
    00876                         default:
    00877                                 s += i;
    00878                                 break;
    00879                         }
    00880                 }
    00881         }
    00882         if (s >= endp) {
    00883                 goto err;
    00884         }
    00885         if (*format == '\0') {
    00886                 *s = '\0';
    00887                 return (s - start);
    00888         } else
    00889                 return 0;
    00890 }
    00891
    00892 size_t
    00893 rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm, VALUE timev, int gmt)
    00894 {
    00895     return rb_strftime_with_timespec(s, maxsize, format, vtm, timev, NULL, gmt);
    00896 }
    00897
    00898 size_t
    00899 rb_strftime_timespec(char *s, size_t maxsize, const char *format, const struct vtm *vtm, struct timespec *ts, int gmt)
    00900 {
    00901     return rb_strftime_with_timespec(s, maxsize, format, vtm, Qnil, ts, gmt);
    00902 }
    00903
    00904 /* isleap --- is a year a leap year? */
    00905
    00906 #ifndef __STDC__
    00907 static int
    00908 isleap(year)
    00909 long year;
    00910 #else
    00911 static int
    00912 isleap(long year)
    00913 #endif
    00914 {
    00915         return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
    00916 }
    00917
    00918
    00919 static void
    00920 vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
    00921 {
    00922     struct tm tm;
    00923
    00924     /* for isleap() in iso8601wknum.  +100 is -1900 (mod 400). */
    00925     tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100;
    00926
    00927     tm.tm_mon = vtm->mon-1;
    00928     tm.tm_mday = vtm->mday;
    00929     tm.tm_hour = vtm->hour;
    00930     tm.tm_min = vtm->min;
    00931     tm.tm_sec = vtm->sec;
    00932     tm.tm_wday = vtm->wday;
    00933     tm.tm_yday = vtm->yday-1;
    00934     tm.tm_isdst = vtm->isdst;
    00935 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
    00936     tm.tm_gmtoff = NUM2LONG(vtm->utc_offset);
    00937 #endif
    00938 #if defined(HAVE_TM_ZONE)
    00939     tm.tm_zone = (char *)vtm->zone;
    00940 #endif
    00941     *result = tm;
    00942 }
    00943
    00944 #ifdef POSIX2_DATE
    00945 /* iso8601wknum --- compute week number according to ISO 8601 */
    00946
    00947 #ifndef __STDC__
    00948 static int
    00949 iso8601wknum(timeptr)
    00950 const struct tm *timeptr;
    00951 #else
    00952 static int
    00953 iso8601wknum(const struct tm *timeptr)
    00954 #endif
    00955 {
    00956         /*
    00957          * From 1003.2:
    00958          *      If the week (Monday to Sunday) containing January 1
    00959          *      has four or more days in the new year, then it is week 1;
    00960          *      otherwise it is the highest numbered week of the previous
    00961          *      year (52 or 53), and the next week is week 1.
    00962          *
    00963          * ADR: This means if Jan 1 was Monday through Thursday,
    00964          *      it was week 1, otherwise week 52 or 53.
    00965          *
    00966          * XPG4 erroneously included POSIX.2 rationale text in the
    00967          * main body of the standard. Thus it requires week 53.
    00968          */
    00969
    00970         int weeknum, jan1day;
    00971
    00972         /* get week number, Monday as first day of the week */
    00973         weeknum = weeknumber(timeptr, 1);
    00974
    00975         /*
    00976          * With thanks and tip of the hatlo to tml@tik.vtt.fi
    00977          *
    00978          * What day of the week does January 1 fall on?
    00979          * We know that
    00980          *      (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
    00981          *              (timeptr->tm_wday - jan1.tm_wday) MOD 7
    00982          * and that
    00983          *      jan1.tm_yday == 0
    00984          * and that
    00985          *      timeptr->tm_wday MOD 7 == timeptr->tm_wday
    00986          * from which it follows that. . .
    00987          */
    00988         jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
    00989         if (jan1day < 0)
    00990                 jan1day += 7;
    00991
    00992         /*
    00993          * If Jan 1 was a Monday through Thursday, it was in
    00994          * week 1.  Otherwise it was last year's highest week, which is
    00995          * this year's week 0.
    00996          *
    00997          * What does that mean?
    00998          * If Jan 1 was Monday, the week number is exactly right, it can
    00999          *      never be 0.
    01000          * If it was Tuesday through Thursday, the weeknumber is one
    01001          *      less than it should be, so we add one.
    01002          * Otherwise, Friday, Saturday or Sunday, the week number is
    01003          * OK, but if it is 0, it needs to be 52 or 53.
    01004          */
    01005         switch (jan1day) {
    01006         case 1:         /* Monday */
    01007                 break;
    01008         case 2:         /* Tuesday */
    01009         case 3:         /* Wednesday */
    01010         case 4:         /* Thursday */
    01011                 weeknum++;
    01012                 break;
    01013         case 5:         /* Friday */
    01014         case 6:         /* Saturday */
    01015         case 0:         /* Sunday */
    01016                 if (weeknum == 0) {
    01017 #ifdef USE_BROKEN_XPG4
    01018                         /* XPG4 (as of March 1994) says 53 unconditionally */
    01019                         weeknum = 53;
    01020 #else
    01021                         /* get week number of last week of last year */
    01022                         struct tm dec31ly;      /* 12/31 last year */
    01023                         dec31ly = *timeptr;
    01024                         dec31ly.tm_year--;
    01025                         dec31ly.tm_mon = 11;
    01026                         dec31ly.tm_mday = 31;
    01027                         dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
    01028                         dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
    01029                         weeknum = iso8601wknum(& dec31ly);
    01030 #endif
    01031                 }
    01032                 break;
    01033         }
    01034
    01035         if (timeptr->tm_mon == 11) {
    01036                 /*
    01037                  * The last week of the year
    01038                  * can be in week 1 of next year.
    01039                  * Sigh.
    01040                  *
    01041                  * This can only happen if
    01042                  *      M   T  W
    01043                  *      29  30 31
    01044                  *      30  31
    01045                  *      31
    01046                  */
    01047                 int wday, mday;
    01048
    01049                 wday = timeptr->tm_wday;
    01050                 mday = timeptr->tm_mday;
    01051                 if (   (wday == 1 && (mday >= 29 && mday <= 31))
    01052                     || (wday == 2 && (mday == 30 || mday == 31))
    01053                     || (wday == 3 &&  mday == 31))
    01054                         weeknum = 1;
    01055         }
    01056
    01057         return weeknum;
    01058 }
    01059
    01060 static int
    01061 iso8601wknum_v(const struct vtm *vtm)
    01062 {
    01063         struct tm tm;
    01064         vtm2tm_noyear(vtm, &tm);
    01065         return iso8601wknum(&tm);
    01066 }
    01067
    01068 #endif
    01069
    01070 /* weeknumber --- figure how many weeks into the year */
    01071
    01072 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
    01073
    01074 #ifndef __STDC__
    01075 static int
    01076 weeknumber(timeptr, firstweekday)
    01077 const struct tm *timeptr;
    01078 int firstweekday;
    01079 #else
    01080 static int
    01081 weeknumber(const struct tm *timeptr, int firstweekday)
    01082 #endif
    01083 {
    01084         int wday = timeptr->tm_wday;
    01085         int ret;
    01086
    01087         if (firstweekday == 1) {
    01088                 if (wday == 0)  /* sunday */
    01089                         wday = 6;
    01090                 else
    01091                         wday--;
    01092         }
    01093         ret = ((timeptr->tm_yday + 7 - wday) / 7);
    01094         if (ret < 0)
    01095                 ret = 0;
    01096         return ret;
    01097 }
    01098
    01099 static int
    01100 weeknumber_v(const struct vtm *vtm, int firstweekday)
    01101 {
    01102         struct tm tm;
    01103         vtm2tm_noyear(vtm, &tm);
    01104         return weeknumber(&tm, firstweekday);
    01105 }
    01106
    01107 #if 0
    01108 /* ADR --- I'm loathe to mess with ado's code ... */
    01109
    01110 Date:         Wed, 24 Apr 91 20:54:08 MDT
    01111 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
    01112 To: arnold@audiofax.com
    01113
    01114 Hi Arnold,
    01115 in a process of fixing of strftime() in libraries on Atari ST I grabbed
    01116 some pieces of code from your own strftime.  When doing that it came
    01117 to mind that your weeknumber() function compiles a little bit nicer
    01118 in the following form:
    01119 /*
    01120  * firstweekday is 0 if starting in Sunday, non-zero if in Monday
    01121  */
    01122 {
    01123     return (timeptr->tm_yday - timeptr->tm_wday +
    01124             (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
    01125 }
    01126 How nicer it depends on a compiler, of course, but always a tiny bit.
    01127
    01128    Cheers,
    01129    Michal
    01130    ntomczak@vm.ucs.ualberta.ca
    01131 #endif
    01132
    01133 #ifdef  TEST_STRFTIME
    01134
    01135 /*
    01136  * NAME:
    01137  *      tst
    01138  *
    01139  * SYNOPSIS:
    01140  *      tst
    01141  *
    01142  * DESCRIPTION:
    01143  *      "tst" is a test driver for the function "strftime".
    01144  *
    01145  * OPTIONS:
    01146  *      None.
    01147  *
    01148  * AUTHOR:
    01149  *      Karl Vogel
    01150  *      Control Data Systems, Inc.
    01151  *      vogelke@c-17igp.wpafb.af.mil
    01152  *
    01153  * BUGS:
    01154  *      None noticed yet.
    01155  *
    01156  * COMPILE:
    01157  *      cc -o tst -DTEST_STRFTIME strftime.c
    01158  */
    01159
    01160 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
    01161
    01162 #ifndef NULL
    01163 #include        <stdio.h>
    01164 #endif
    01165 #include        <sys/time.h>
    01166 #include        <string.h>
    01167
    01168 #define         MAXTIME         132
    01169
    01170 /*
    01171  * Array of time formats.
    01172  */
    01173
    01174 static char *array[] =
    01175 {
    01176         "(%%A)      full weekday name, var length (Sunday..Saturday)  %A",
    01177         "(%%B)       full month name, var length (January..December)  %B",
    01178         "(%%C)                                               Century  %C",
    01179         "(%%D)                                       date (%%m/%%d/%%y)  %D",
    01180         "(%%E)                           Locale extensions (ignored)  %E",
    01181         "(%%H)                          hour (24-hour clock, 00..23)  %H",
    01182         "(%%I)                          hour (12-hour clock, 01..12)  %I",
    01183         "(%%M)                                       minute (00..59)  %M",
    01184         "(%%O)                           Locale extensions (ignored)  %O",
    01185         "(%%R)                                 time, 24-hour (%%H:%%M)  %R",
    01186         "(%%S)                                       second (00..60)  %S",
    01187         "(%%T)                              time, 24-hour (%%H:%%M:%%S)  %T",
    01188         "(%%U)    week of year, Sunday as first day of week (00..53)  %U",
    01189         "(%%V)                    week of year according to ISO 8601  %V",
    01190         "(%%W)    week of year, Monday as first day of week (00..53)  %W",
    01191         "(%%X)     appropriate locale time representation (%H:%M:%S)  %X",
    01192         "(%%Y)                           year with century (1970...)  %Y",
    01193         "(%%Z) timezone (EDT), or blank if timezone not determinable  %Z",
    01194         "(%%a)          locale's abbreviated weekday name (Sun..Sat)  %a",
    01195         "(%%b)            locale's abbreviated month name (Jan..Dec)  %b",
    01196         "(%%c)           full date (Sat Nov  4 12:02:33 1989)%n%t%t%t  %c",
    01197         "(%%d)                             day of the month (01..31)  %d",
    01198         "(%%e)               day of the month, blank-padded ( 1..31)  %e",
    01199         "(%%h)                                should be same as (%%b)  %h",
    01200         "(%%j)                            day of the year (001..366)  %j",
    01201         "(%%k)               hour, 24-hour clock, blank pad ( 0..23)  %k",
    01202         "(%%l)               hour, 12-hour clock, blank pad ( 1..12)  %l",
    01203         "(%%m)                                        month (01..12)  %m",
    01204         "(%%p)              locale's AM or PM based on 12-hour clock  %p",
    01205         "(%%r)                   time, 12-hour (same as %%I:%%M:%%S %%p)  %r",
    01206         "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7]   %u",
    01207         "(%%v)                                VMS date (dd-bbb-YYYY)  %v",
    01208         "(%%w)                       day of week (0..6, Sunday == 0)  %w",
    01209         "(%%x)                appropriate locale date representation  %x",
    01210         "(%%y)                      last two digits of year (00..99)  %y",
    01211         "(%%z)      timezone offset east of GMT as HHMM (e.g. -0500)  %z",
    01212         (char *) NULL
    01213 };
    01214
    01215 /* main routine. */
    01216
    01217 int
    01218 main(argc, argv)
    01219 int argc;
    01220 char **argv;
    01221 {
    01222         long time();
    01223
    01224         char *next;
    01225         char string[MAXTIME];
    01226
    01227         int k;
    01228         int length;
    01229
    01230         struct tm *tm;
    01231
    01232         long clock;
    01233
    01234         /* Call the function. */
    01235
    01236         clock = time((long *) 0);
    01237         tm = localtime(&clock);
    01238
    01239         for (k = 0; next = array[k]; k++) {
    01240                 length = strftime(string, MAXTIME, next, tm);
    01241                 printf("%s\n", string);
    01242         }
    01243
    01244         exit(0);
    01245 }
    01246 #endif  /* TEST_STRFTIME */
    01247