Ruby: strftime.c Source File

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 
00077 #if defined(ISO_DATE_EXT)
00078 #if ! defined(POSIX2_DATE)
00079 #define POSIX2_DATE     1
00080 #endif
00081 #endif
00082 
00083 #if defined(POSIX2_DATE)
00084 #if ! defined(SYSV_EXT)
00085 #define SYSV_EXT        1
00086 #endif
00087 #if ! defined(SUNOS_EXT)
00088 #define SUNOS_EXT       1
00089 #endif
00090 #endif
00091 
00092 #if defined(POSIX2_DATE)
00093 #define adddecl(stuff)  stuff
00094 #else
00095 #define adddecl(stuff)
00096 #endif
00097 
00098 #undef strchr   /* avoid AIX weirdness */
00099 
00100 #if !defined __STDC__ && !defined _WIN32
00101 #define const   
00102 static int weeknumber();
00103 adddecl(static int iso8601wknum();)
00104 static int weeknumber_v();
00105 adddecl(static int iso8601wknum_v();)
00106 #else
00107 static int weeknumber(const struct tm *timeptr, int firstweekday);
00108 adddecl(static int iso8601wknum(const struct tm *timeptr);)
00109 static int weeknumber_v(const struct vtm *vtm, int firstweekday);
00110 adddecl(static int iso8601wknum_v(const struct vtm *vtm);)
00111 #endif
00112 
00113 #ifdef STDC_HEADERS
00114 #include <stdlib.h>
00115 #include <string.h>
00116 #else
00117 extern void *malloc();
00118 extern void *realloc();
00119 extern char *getenv();
00120 extern char *strchr();
00121 #endif
00122 
00123 #define range(low, item, hi)    max((low), min((item), (hi)))
00124 
00125 #undef min      /* just in case */
00126 
00127 /* min --- return minimum of two numbers */
00128 
00129 #ifndef __STDC__
00130 static inline int
00131 min(a, b)
00132 int a, b;
00133 #else
00134 static inline int
00135 min(int a, int b)
00136 #endif
00137 {
00138         return (a < b ? a : b);
00139 }
00140 
00141 #undef max      /* also, just in case */
00142 
00143 /* max --- return maximum of two numbers */
00144 
00145 #ifndef __STDC__
00146 static inline int
00147 max(a, b)
00148 int a, b;
00149 #else
00150 static inline int
00151 max(int a, int b)
00152 #endif
00153 {
00154         return (a > b ? a : b);
00155 }
00156 
00157 #ifdef NO_STRING_LITERAL_CONCATENATION
00158 #error No string literal concatenation
00159 #endif
00160 
00161 #define add(x,y) (rb_funcall((x), '+', 1, (y)))
00162 #define sub(x,y) (rb_funcall((x), '-', 1, (y)))
00163 #define mul(x,y) (rb_funcall((x), '*', 1, (y)))
00164 #define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y)))
00165 #define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y)))
00166 #define mod(x,y) (rb_funcall((x), '%', 1, (y)))
00167 
00168 /* strftime --- produce formatted time */
00169 
00170 static size_t
00171 rb_strftime_with_timespec(char *s, size_t maxsize, const char *format, const struct vtm *vtm, VALUE timev, struct timespec *ts, int gmt)
00172 {
00173         const char *const endp = s + maxsize;
00174         const char *const start = s;
00175         const char *sp, *tp;
00176         auto char tbuf[100];
00177         long off;
00178         ptrdiff_t i;
00179         int w;
00180         long y;
00181         int precision, flags, colons;
00182         char padding;
00183         enum {LEFT, CHCASE, LOWER, UPPER, LOCALE_O, LOCALE_E};
00184 #define BIT_OF(n) (1U<<(n))
00185 
00186         /* various tables, useful in North America */
00187         static const char days_l[][10] = {
00188                 "Sunday", "Monday", "Tuesday", "Wednesday",
00189                 "Thursday", "Friday", "Saturday",
00190         };
00191         static const char months_l[][10] = {
00192                 "January", "February", "March", "April",
00193                 "May", "June", "July", "August", "September",
00194                 "October", "November", "December",
00195         };
00196         static const char ampm[][3] = { "AM", "PM", };
00197 
00198         if (s == NULL || format == NULL || vtm == NULL || maxsize == 0)
00199                 return 0;
00200 
00201         /* quick check if we even need to bother */
00202         if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) {
00203         err:
00204                 errno = ERANGE;
00205                 return 0;
00206         }
00207 
00208         for (; *format && s < endp - 1; format++) {
00209 #define FLAG_FOUND() do { \
00210                         if (precision > 0 || flags & (BIT_OF(LOCALE_E)|BIT_OF(LOCALE_O))) \
00211                                 goto unknown; \
00212                 } while (0)
00213 #define NEEDS(n) do if (s >= endp || (n) >= endp - s - 1) goto err; while (0)
00214 #define FILL_PADDING(i) do { \
00215         if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \
00216                 NEEDS(precision); \
00217                 memset(s, padding ? padding : ' ', precision - (i)); \
00218                 s += precision - (i); \
00219         } \
00220         else { \
00221                 NEEDS(i); \
00222         } \
00223 } while (0);
00224 #define FMT(def_pad, def_prec, fmt, val) \
00225                 do { \
00226                         int l; \
00227                         if (precision <= 0) precision = (def_prec); \
00228                         if (flags & BIT_OF(LEFT)) precision = 1; \
00229                         l = snprintf(s, endp - s, \
00230                                      ((padding == '0' || (!padding && (def_pad) == '0')) ? "%0*"fmt : "%*"fmt), \
00231                                      precision, (val)); \
00232                         if (l < 0) goto err; \
00233                         s += l; \
00234                 } while (0)
00235 #define STRFTIME(fmt) \
00236                 do { \
00237                         i = rb_strftime_with_timespec(s, endp - s, (fmt), vtm, timev, ts, gmt); \
00238                         if (!i) return 0; \
00239                         if (precision > i) {\
00240                                 NEEDS(precision); \
00241                                 memmove(s + precision - i, s, i);\
00242                                 memset(s, padding ? padding : ' ', precision - i); \
00243                                 s += precision; \
00244                         }\
00245                         else s += i; \
00246                 } while (0)
00247 #define FMTV(def_pad, def_prec, fmt, val) \
00248                 do { \
00249                         VALUE tmp = (val); \
00250                         if (FIXNUM_P(tmp)) { \
00251                                 FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
00252                         } \
00253                         else { \
00254                                 VALUE args[2], result; \
00255                                 size_t l; \
00256                                 if (precision <= 0) precision = (def_prec); \
00257                                 if (flags & BIT_OF(LEFT)) precision = 1; \
00258                                 args[0] = INT2FIX(precision); \
00259                                 args[1] = (val); \
00260                                 if (padding == '0' || (!padding && (def_pad) == '0')) \
00261                                         result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \
00262                                 else \
00263                                         result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \
00264                                 l = strlcpy(s, StringValueCStr(result), endp-s); \
00265                                 if ((size_t)(endp-s) <= l) \
00266                                         goto err; \
00267                                 s += l; \
00268                         } \
00269                 } while (0)
00270 
00271                 if (*format != '%') {
00272                         *s++ = *format;
00273                         continue;
00274                 }
00275                 tp = tbuf;
00276                 sp = format;
00277                 precision = -1;
00278                 flags = 0;
00279                 padding = 0;
00280                 colons = 0;
00281         again:
00282                 switch (*++format) {
00283                 case '\0':
00284                         format--;
00285                         goto unknown;
00286 
00287                 case '%':
00288                         FILL_PADDING(1);
00289                         *s++ = '%';
00290                         continue;
00291 
00292                 case 'a':       /* abbreviated weekday name */
00293                         if (flags & BIT_OF(CHCASE)) {
00294                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00295                                 flags |= BIT_OF(UPPER);
00296                         }
00297                         if (vtm->wday < 0 || vtm->wday > 6)
00298                                 i = 1, tp = "?";
00299                         else
00300                                 i = 3, tp = days_l[vtm->wday];
00301                         break;
00302 
00303                 case 'A':       /* full weekday name */
00304                         if (flags & BIT_OF(CHCASE)) {
00305                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00306                                 flags |= BIT_OF(UPPER);
00307                         }
00308                         if (vtm->wday < 0 || vtm->wday > 6)
00309                                 i = 1, tp = "?";
00310                         else
00311                                 i = strlen(tp = days_l[vtm->wday]);
00312                         break;
00313 
00314 #ifdef SYSV_EXT
00315                 case 'h':       /* abbreviated month name */
00316 #endif
00317                 case 'b':       /* abbreviated month name */
00318                         if (flags & BIT_OF(CHCASE)) {
00319                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00320                                 flags |= BIT_OF(UPPER);
00321                         }
00322                         if (vtm->mon < 1 || vtm->mon > 12)
00323                                 i = 1, tp = "?";
00324                         else
00325                                 i = 3, tp = months_l[vtm->mon-1];
00326                         break;
00327 
00328                 case 'B':       /* full month name */
00329                         if (flags & BIT_OF(CHCASE)) {
00330                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00331                                 flags |= BIT_OF(UPPER);
00332                         }
00333                         if (vtm->mon < 1 || vtm->mon > 12)
00334                                 i = 1, tp = "?";
00335                         else
00336                                 i = strlen(tp = months_l[vtm->mon-1]);
00337                         break;
00338 
00339                 case 'c':       /* appropriate date and time representation */
00340                         STRFTIME("%a %b %e %H:%M:%S %Y");
00341                         continue;
00342 
00343                 case 'd':       /* day of the month, 01 - 31 */
00344                         i = range(1, vtm->mday, 31);
00345                         FMT('0', 2, "d", (int)i);
00346                         continue;
00347 
00348                 case 'H':       /* hour, 24-hour clock, 00 - 23 */
00349                         i = range(0, vtm->hour, 23);
00350                         FMT('0', 2, "d", (int)i);
00351                         continue;
00352 
00353                 case 'I':       /* hour, 12-hour clock, 01 - 12 */
00354                         i = range(0, vtm->hour, 23);
00355                         if (i == 0)
00356                                 i = 12;
00357                         else if (i > 12)
00358                                 i -= 12;
00359                         FMT('0', 2, "d", (int)i);
00360                         continue;
00361 
00362                 case 'j':       /* day of the year, 001 - 366 */
00363                         FMT('0', 3, "d", vtm->yday);
00364                         continue;
00365 
00366                 case 'm':       /* month, 01 - 12 */
00367                         i = range(1, vtm->mon, 12);
00368                         FMT('0', 2, "d", (int)i);
00369                         continue;
00370 
00371                 case 'M':       /* minute, 00 - 59 */
00372                         i = range(0, vtm->min, 59);
00373                         FMT('0', 2, "d", (int)i);
00374                         continue;
00375 
00376                 case 'p':       /* AM or PM based on 12-hour clock */
00377                 case 'P':       /* am or pm based on 12-hour clock */
00378                         if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
00379                             (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
00380                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
00381                                 flags |= BIT_OF(LOWER);
00382                         }
00383                         i = range(0, vtm->hour, 23);
00384                         if (i < 12)
00385                                 tp = ampm[0];
00386                         else
00387                                 tp = ampm[1];
00388                         i = 2;
00389                         break;
00390 
00391                 case 's':
00392                         if (ts) {
00393                                 time_t sec = ts->tv_sec;
00394                                 if (~(time_t)0 <= 0)
00395                                     FMT('0', 1, PRI_TIMET_PREFIX"d", sec);
00396                                 else
00397                                     FMT('0', 1, PRI_TIMET_PREFIX"u", sec);
00398                         }
00399                         else {
00400                                 VALUE sec = div(timev, INT2FIX(1));
00401                                 FMTV('0', 1, "d", sec);
00402                         }
00403                         continue;
00404 
00405                 case 'S':       /* second, 00 - 60 */
00406                         i = range(0, vtm->sec, 60);
00407                         FMT('0', 2, "d", (int)i);
00408                         continue;
00409 
00410                 case 'U':       /* week of year, Sunday is first day of week */
00411                         FMT('0', 2, "d", weeknumber_v(vtm, 0));
00412                         continue;
00413 
00414                 case 'w':       /* weekday, Sunday == 0, 0 - 6 */
00415                         i = range(0, vtm->wday, 6);
00416                         FMT('0', 1, "d", (int)i);
00417                         continue;
00418 
00419                 case 'W':       /* week of year, Monday is first day of week */
00420                         FMT('0', 2, "d", weeknumber_v(vtm, 1));
00421                         continue;
00422 
00423                 case 'x':       /* appropriate date representation */
00424                         STRFTIME("%m/%d/%y");
00425                         continue;
00426 
00427                 case 'X':       /* appropriate time representation */
00428                         STRFTIME("%H:%M:%S");
00429                         continue;
00430 
00431                 case 'y':       /* year without a century, 00 - 99 */
00432                         i = NUM2INT(mod(vtm->year, INT2FIX(100)));
00433                         FMT('0', 2, "d", (int)i);
00434                         continue;
00435 
00436                 case 'Y':       /* year with century */
00437                         if (FIXNUM_P(vtm->year)) {
00438                             long y = FIX2LONG(vtm->year);
00439                             FMT('0', 0 <= y ? 4 : 5, "ld", y);
00440                         }
00441                         else {
00442                             FMTV('0', 4, "d", vtm->year);
00443                         }
00444                         continue;
00445 
00446 #ifdef MAILHEADER_EXT
00447                 case 'z':       /* time zone offset east of GMT e.g. -0600 */
00448                         switch (colons) {
00449                           case 0: /* %z -> +hhmm */
00450                             precision = precision <= 5 ? 2 : precision-3;
00451                             NEEDS(precision + 3);
00452                             break;
00453 
00454                           case 1: /* %:z -> +hh:mm */
00455                             precision = precision <= 6 ? 2 : precision-4;
00456                             NEEDS(precision + 4);
00457                             break;
00458 
00459                           case 2: /* %::z -> +hh:mm:ss */
00460                             precision = precision <= 9 ? 2 : precision-7;
00461                             NEEDS(precision + 7);
00462                             break;
00463 
00464                           default:
00465                             format--;
00466                             goto unknown;
00467                         }
00468                         if (gmt) {
00469                                 off = 0;
00470                         }
00471                         else {
00472                                 off = NUM2LONG(rb_funcall(vtm->utc_offset, rb_intern("round"), 0));
00473                         }
00474                         if (off < 0) {
00475                                 off = -off;
00476                                 *s++ = '-';
00477                         } else {
00478                                 *s++ = '+';
00479                         }
00480                         i = snprintf(s, endp - s, (padding == ' ' ? "%*ld" : "%.*ld"), precision, off / 3600);
00481                         if (i < 0) goto err;
00482                         s += i;
00483                         off = off % 3600;
00484                         if (1 <= colons)
00485                             *s++ = ':';
00486                         i = snprintf(s, endp - s, "%02d", (int)(off / 60));
00487                         if (i < 0) goto err;
00488                         s += i;
00489                         off = off % 60;
00490                         if (2 <= colons) {
00491                             *s++ = ':';
00492                             i = snprintf(s, endp - s, "%02d", (int)off);
00493                             if (i < 0) goto err;
00494                             s += i;
00495                         }
00496                         continue;
00497 #endif /* MAILHEADER_EXT */
00498 
00499                 case 'Z':       /* time zone name or abbreviation */
00500                         if (flags & BIT_OF(CHCASE)) {
00501                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
00502                                 flags |= BIT_OF(LOWER);
00503                         }
00504                         if (gmt) {
00505                                 i = 3;
00506                                 tp = "UTC";
00507                                 break;
00508                         }
00509                         if (vtm->zone == NULL)
00510                             tp = "";
00511                         else
00512                             tp = vtm->zone;
00513                         i = strlen(tp);
00514                         break;
00515 
00516 #ifdef SYSV_EXT
00517                 case 'n':       /* same as \n */
00518                         FILL_PADDING(1);
00519                         *s++ = '\n';
00520                         continue;
00521 
00522                 case 't':       /* same as \t */
00523                         FILL_PADDING(1);
00524                         *s++ = '\t';
00525                         continue;
00526 
00527                 case 'D':       /* date as %m/%d/%y */
00528                         STRFTIME("%m/%d/%y");
00529                         continue;
00530 
00531                 case 'e':       /* day of month, blank padded */
00532                         FMT(' ', 2, "d", range(1, vtm->mday, 31));
00533                         continue;
00534 
00535                 case 'r':       /* time as %I:%M:%S %p */
00536                         STRFTIME("%I:%M:%S %p");
00537                         continue;
00538 
00539                 case 'R':       /* time as %H:%M */
00540                         STRFTIME("%H:%M");
00541                         continue;
00542 
00543                 case 'T':       /* time as %H:%M:%S */
00544                         STRFTIME("%H:%M:%S");
00545                         continue;
00546 #endif
00547 
00548 #ifdef SUNOS_EXT
00549                 case 'k':       /* hour, 24-hour clock, blank pad */
00550                         i = range(0, vtm->hour, 23);
00551                         FMT(' ', 2, "d", (int)i);
00552                         continue;
00553 
00554                 case 'l':       /* hour, 12-hour clock, 1 - 12, blank pad */
00555                         i = range(0, vtm->hour, 23);
00556                         if (i == 0)
00557                                 i = 12;
00558                         else if (i > 12)
00559                                 i -= 12;
00560                         FMT(' ', 2, "d", (int)i);
00561                         continue;
00562 #endif
00563 
00564 
00565 #ifdef VMS_EXT
00566                 case 'v':       /* date as dd-bbb-YYYY */
00567                         STRFTIME("%e-%^b-%4Y");
00568                         continue;
00569 #endif
00570 
00571 
00572 #ifdef POSIX2_DATE
00573                 case 'C':
00574                         FMTV('0', 2, "d", div(vtm->year, INT2FIX(100)));
00575                         continue;
00576 
00577                 case 'E':
00578                         /* POSIX locale extensions, ignored for now */
00579                         flags |= BIT_OF(LOCALE_E);
00580                         goto again;
00581                 case 'O':
00582                         /* POSIX locale extensions, ignored for now */
00583                         flags |= BIT_OF(LOCALE_O);
00584                         goto again;
00585 
00586                 case 'V':       /* week of year according ISO 8601 */
00587                         FMT('0', 2, "d", iso8601wknum_v(vtm));
00588                         continue;
00589 
00590                 case 'u':
00591                 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
00592                         FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday);
00593                         continue;
00594 #endif  /* POSIX2_DATE */
00595 
00596 #ifdef ISO_DATE_EXT
00597                 case 'G':
00598                 case 'g':
00599                         /*
00600                          * Year of ISO week.
00601                          *
00602                          * If it's December but the ISO week number is one,
00603                          * that week is in next year.
00604                          * If it's January but the ISO week number is 52 or
00605                          * 53, that week is in last year.
00606                          * Otherwise, it's this year.
00607                          */
00608                         {
00609                                 VALUE yv = vtm->year;
00610                                 w = iso8601wknum_v(vtm);
00611                                 if (vtm->mon == 12 && w == 1)
00612                                         yv = add(yv, INT2FIX(1));
00613                                 else if (vtm->mon == 1 && w >= 52)
00614                                         yv = sub(yv, INT2FIX(1));
00615 
00616                                 if (*format == 'G') {
00617                                         if (FIXNUM_P(yv)) {
00618                                                 const long y = FIX2LONG(yv);
00619                                                 FMT('0', 0 <= y ? 4 : 5, "ld", y);
00620                                         }
00621                                         else {
00622                                                 FMTV('0', 4, "d", yv);
00623                                         }
00624                                 }
00625                                 else {
00626                                         yv = mod(yv, INT2FIX(100));
00627                                         y = FIX2LONG(yv);
00628                                         FMT('0', 2, "ld", y);
00629                                 }
00630                                 continue;
00631                         }
00632 
00633 #endif /* ISO_DATE_EXT */
00634 
00635 
00636                 case 'L':
00637                         w = 3;
00638                         goto subsec;
00639 
00640                 case 'N':
00641                         /*
00642                          * fractional second digits. default is 9 digits
00643                          * (nanosecond).
00644                          *
00645                          * %3N  millisecond (3 digits)
00646                          * %6N  microsecond (6 digits)
00647                          * %9N  nanosecond (9 digits)
00648                          */
00649                         w = 9;
00650                 subsec:
00651                         if (precision <= 0) {
00652                             precision = w;
00653                         }
00654                         NEEDS(precision);
00655 
00656                         if (ts) {
00657                                 long subsec = ts->tv_nsec;
00658                                 if (9 < precision) {
00659                                         snprintf(s, endp - s, "%09ld", subsec);
00660                                         memset(s+9, '0', precision-9);
00661                                         s += precision;
00662                                 }
00663                                 else {
00664                                         int i;
00665                                         for (i = 0; i < 9-precision; i++)
00666                                                 subsec /= 10;
00667                                         snprintf(s, endp - s, "%0*ld", precision, subsec);
00668                                         s += precision;
00669                                 }
00670                         }
00671                         else {
00672                                 VALUE subsec = mod(timev, INT2FIX(1));
00673                                 int ww;
00674                                 long n;
00675 
00676                                 ww = precision;
00677                                 while (9 <= ww) {
00678                                         subsec = mul(subsec, INT2FIX(1000000000));
00679                                         ww -= 9;
00680                                 }
00681                                 n = 1;
00682                                 for (; 0 < ww; ww--)
00683                                         n *= 10;
00684                                 if (n != 1)
00685                                         subsec = mul(subsec, INT2FIX(n));
00686                                 subsec = div(subsec, INT2FIX(1));
00687 
00688                                 if (FIXNUM_P(subsec)) {
00689                                         (void)snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
00690                                         s += precision;
00691                                 }
00692                                 else {
00693                                         VALUE args[2], result;
00694                                         args[0] = INT2FIX(precision);
00695                                         args[1] = subsec;
00696                                         result = rb_str_format(2, args, rb_str_new2("%0*d"));
00697                                         (void)strlcpy(s, StringValueCStr(result), endp-s);
00698                                         s += precision;
00699                                 }
00700                         }
00701                         continue;
00702 
00703                 case 'F':       /*  Equivalent to %Y-%m-%d */
00704                         STRFTIME("%Y-%m-%d");
00705                         continue;
00706 
00707                 case '-':
00708                         FLAG_FOUND();
00709                         flags |= BIT_OF(LEFT);
00710                         padding = precision = 0;
00711                         goto again;
00712 
00713                 case '^':
00714                         FLAG_FOUND();
00715                         flags |= BIT_OF(UPPER);
00716                         goto again;
00717 
00718                 case '#':
00719                         FLAG_FOUND();
00720                         flags |= BIT_OF(CHCASE);
00721                         goto again;
00722 
00723                 case '_':
00724                         FLAG_FOUND();
00725                         padding = ' ';
00726                         goto again;
00727 
00728                 case ':':
00729                         FLAG_FOUND();
00730                         colons++;
00731                         goto again;
00732 
00733                 case '0':
00734                         padding = '0';
00735                 case '1':  case '2': case '3': case '4':
00736                 case '5': case '6':  case '7': case '8': case '9':
00737                         {
00738                                 char *e;
00739                                 precision = (int)strtoul(format, &e, 10);
00740                                 format = e - 1;
00741                                 goto again;
00742                         }
00743 
00744                 default:
00745                 unknown:
00746                         i = format - sp + 1;
00747                         tp = sp;
00748                         precision = -1;
00749                         flags = 0;
00750                         padding = 0;
00751                         colons = 0;
00752                         break;
00753                 }
00754                 if (i) {
00755                         FILL_PADDING(i);
00756                         memcpy(s, tp, i);
00757                         switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
00758                         case BIT_OF(UPPER):
00759                                 do {
00760                                         if (ISLOWER(*s)) *s = TOUPPER(*s);
00761                                 } while (s++, --i);
00762                                 break;
00763                         case BIT_OF(LOWER):
00764                                 do {
00765                                         if (ISUPPER(*s)) *s = TOLOWER(*s);
00766                                 } while (s++, --i);
00767                                 break;
00768                         default:
00769                                 s += i;
00770                                 break;
00771                         }
00772                 }
00773         }
00774         if (s >= endp) {
00775                 goto err;
00776         }
00777         if (*format == '\0') {
00778                 *s = '\0';
00779                 return (s - start);
00780         } else
00781                 return 0;
00782 }
00783 
00784 size_t
00785 rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm, VALUE timev, int gmt)
00786 {
00787     return rb_strftime_with_timespec(s, maxsize, format, vtm, timev, NULL, gmt);
00788 }
00789 
00790 size_t
00791 rb_strftime_timespec(char *s, size_t maxsize, const char *format, const struct vtm *vtm, struct timespec *ts, int gmt)
00792 {
00793     return rb_strftime_with_timespec(s, maxsize, format, vtm, Qnil, ts, gmt);
00794 }
00795 
00796 /* isleap --- is a year a leap year? */
00797 
00798 #ifndef __STDC__
00799 static int
00800 isleap(year)
00801 long year;
00802 #else
00803 static int
00804 isleap(long year)
00805 #endif
00806 {
00807         return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
00808 }
00809 
00810 
00811 static void
00812 vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
00813 {
00814     struct tm tm;
00815 
00816     /* for isleap() in iso8601wknum.  +100 is -1900 (mod 400). */
00817     tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100;
00818 
00819     tm.tm_mon = vtm->mon-1;
00820     tm.tm_mday = vtm->mday;
00821     tm.tm_hour = vtm->hour;
00822     tm.tm_min = vtm->min;
00823     tm.tm_sec = vtm->sec;
00824     tm.tm_wday = vtm->wday;
00825     tm.tm_yday = vtm->yday-1;
00826     tm.tm_isdst = vtm->isdst;
00827 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
00828     tm.tm_gmtoff = NUM2LONG(vtm->utc_offset);
00829 #endif
00830 #if defined(HAVE_TM_ZONE)
00831     tm.tm_zone = (char *)vtm->zone;
00832 #endif
00833     *result = tm;
00834 }
00835 
00836 #ifdef POSIX2_DATE
00837 /* iso8601wknum --- compute week number according to ISO 8601 */
00838 
00839 #ifndef __STDC__
00840 static int
00841 iso8601wknum(timeptr)
00842 const struct tm *timeptr;
00843 #else
00844 static int
00845 iso8601wknum(const struct tm *timeptr)
00846 #endif
00847 {
00848         /*
00849          * From 1003.2:
00850          *      If the week (Monday to Sunday) containing January 1
00851          *      has four or more days in the new year, then it is week 1;
00852          *      otherwise it is the highest numbered week of the previous
00853          *      year (52 or 53), and the next week is week 1.
00854          *
00855          * ADR: This means if Jan 1 was Monday through Thursday,
00856          *      it was week 1, otherwise week 52 or 53.
00857          *
00858          * XPG4 erroneously included POSIX.2 rationale text in the
00859          * main body of the standard. Thus it requires week 53.
00860          */
00861 
00862         int weeknum, jan1day;
00863 
00864         /* get week number, Monday as first day of the week */
00865         weeknum = weeknumber(timeptr, 1);
00866 
00867         /*
00868          * With thanks and tip of the hatlo to tml@tik.vtt.fi
00869          *
00870          * What day of the week does January 1 fall on?
00871          * We know that
00872          *      (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
00873          *              (timeptr->tm_wday - jan1.tm_wday) MOD 7
00874          * and that
00875          *      jan1.tm_yday == 0
00876          * and that
00877          *      timeptr->tm_wday MOD 7 == timeptr->tm_wday
00878          * from which it follows that. . .
00879          */
00880         jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
00881         if (jan1day < 0)
00882                 jan1day += 7;
00883 
00884         /*
00885          * If Jan 1 was a Monday through Thursday, it was in
00886          * week 1.  Otherwise it was last year's highest week, which is
00887          * this year's week 0.
00888          *
00889          * What does that mean?
00890          * If Jan 1 was Monday, the week number is exactly right, it can
00891          *      never be 0.
00892          * If it was Tuesday through Thursday, the weeknumber is one
00893          *      less than it should be, so we add one.
00894          * Otherwise, Friday, Saturday or Sunday, the week number is
00895          * OK, but if it is 0, it needs to be 52 or 53.
00896          */
00897         switch (jan1day) {
00898         case 1:         /* Monday */
00899                 break;
00900         case 2:         /* Tuesday */
00901         case 3:         /* Wednesday */
00902         case 4:         /* Thursday */
00903                 weeknum++;
00904                 break;
00905         case 5:         /* Friday */
00906         case 6:         /* Saturday */
00907         case 0:         /* Sunday */
00908                 if (weeknum == 0) {
00909 #ifdef USE_BROKEN_XPG4
00910                         /* XPG4 (as of March 1994) says 53 unconditionally */
00911                         weeknum = 53;
00912 #else
00913                         /* get week number of last week of last year */
00914                         struct tm dec31ly;      /* 12/31 last year */
00915                         dec31ly = *timeptr;
00916                         dec31ly.tm_year--;
00917                         dec31ly.tm_mon = 11;
00918                         dec31ly.tm_mday = 31;
00919                         dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
00920                         dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
00921                         weeknum = iso8601wknum(& dec31ly);
00922 #endif
00923                 }
00924                 break;
00925         }
00926 
00927         if (timeptr->tm_mon == 11) {
00928                 /*
00929                  * The last week of the year
00930                  * can be in week 1 of next year.
00931                  * Sigh.
00932                  *
00933                  * This can only happen if
00934                  *      M   T  W
00935                  *      29  30 31
00936                  *      30  31
00937                  *      31
00938                  */
00939                 int wday, mday;
00940 
00941                 wday = timeptr->tm_wday;
00942                 mday = timeptr->tm_mday;
00943                 if (   (wday == 1 && (mday >= 29 && mday <= 31))
00944                     || (wday == 2 && (mday == 30 || mday == 31))
00945                     || (wday == 3 &&  mday == 31))
00946                         weeknum = 1;
00947         }
00948 
00949         return weeknum;
00950 }
00951 
00952 static int
00953 iso8601wknum_v(const struct vtm *vtm)
00954 {
00955         struct tm tm;
00956         vtm2tm_noyear(vtm, &tm);
00957         return iso8601wknum(&tm);
00958 }
00959 
00960 #endif
00961 
00962 /* weeknumber --- figure how many weeks into the year */
00963 
00964 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
00965 
00966 #ifndef __STDC__
00967 static int
00968 weeknumber(timeptr, firstweekday)
00969 const struct tm *timeptr;
00970 int firstweekday;
00971 #else
00972 static int
00973 weeknumber(const struct tm *timeptr, int firstweekday)
00974 #endif
00975 {
00976         int wday = timeptr->tm_wday;
00977         int ret;
00978 
00979         if (firstweekday == 1) {
00980                 if (wday == 0)  /* sunday */
00981                         wday = 6;
00982                 else
00983                         wday--;
00984         }
00985         ret = ((timeptr->tm_yday + 7 - wday) / 7);
00986         if (ret < 0)
00987                 ret = 0;
00988         return ret;
00989 }
00990 
00991 static int
00992 weeknumber_v(const struct vtm *vtm, int firstweekday)
00993 {
00994         struct tm tm;
00995         vtm2tm_noyear(vtm, &tm);
00996         return weeknumber(&tm, firstweekday);
00997 }
00998 
00999 #if 0
01000 /* ADR --- I'm loathe to mess with ado's code ... */
01001 
01002 Date:         Wed, 24 Apr 91 20:54:08 MDT
01003 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
01004 To: arnold@audiofax.com
01005 
01006 Hi Arnold,
01007 in a process of fixing of strftime() in libraries on Atari ST I grabbed
01008 some pieces of code from your own strftime.  When doing that it came
01009 to mind that your weeknumber() function compiles a little bit nicer
01010 in the following form:
01011 /*
01012  * firstweekday is 0 if starting in Sunday, non-zero if in Monday
01013  */
01014 {
01015     return (timeptr->tm_yday - timeptr->tm_wday +
01016             (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
01017 }
01018 How nicer it depends on a compiler, of course, but always a tiny bit.
01019 
01020    Cheers,
01021    Michal
01022    ntomczak@vm.ucs.ualberta.ca
01023 #endif
01024 
01025 #ifdef  TEST_STRFTIME
01026 
01027 /*
01028  * NAME:
01029  *      tst
01030  *
01031  * SYNOPSIS:
01032  *      tst
01033  *
01034  * DESCRIPTION:
01035  *      "tst" is a test driver for the function "strftime".
01036  *
01037  * OPTIONS:
01038  *      None.
01039  *
01040  * AUTHOR:
01041  *      Karl Vogel
01042  *      Control Data Systems, Inc.
01043  *      vogelke@c-17igp.wpafb.af.mil
01044  *
01045  * BUGS:
01046  *      None noticed yet.
01047  *
01048  * COMPILE:
01049  *      cc -o tst -DTEST_STRFTIME strftime.c
01050  */
01051 
01052 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
01053 
01054 #ifndef NULL
01055 #include        <stdio.h>
01056 #endif
01057 #include        <sys/time.h>
01058 #include        <string.h>
01059 
01060 #define         MAXTIME         132
01061 
01062 /*
01063  * Array of time formats.
01064  */
01065 
01066 static char *array[] =
01067 {
01068         "(%%A)      full weekday name, var length (Sunday..Saturday)  %A",
01069         "(%%B)       full month name, var length (January..December)  %B",
01070         "(%%C)                                               Century  %C",
01071         "(%%D)                                       date (%%m/%%d/%%y)  %D",
01072         "(%%E)                           Locale extensions (ignored)  %E",
01073         "(%%H)                          hour (24-hour clock, 00..23)  %H",
01074         "(%%I)                          hour (12-hour clock, 01..12)  %I",
01075         "(%%M)                                       minute (00..59)  %M",
01076         "(%%O)                           Locale extensions (ignored)  %O",
01077         "(%%R)                                 time, 24-hour (%%H:%%M)  %R",
01078         "(%%S)                                       second (00..60)  %S",
01079         "(%%T)                              time, 24-hour (%%H:%%M:%%S)  %T",
01080         "(%%U)    week of year, Sunday as first day of week (00..53)  %U",
01081         "(%%V)                    week of year according to ISO 8601  %V",
01082         "(%%W)    week of year, Monday as first day of week (00..53)  %W",
01083         "(%%X)     appropriate locale time representation (%H:%M:%S)  %X",
01084         "(%%Y)                           year with century (1970...)  %Y",
01085         "(%%Z) timezone (EDT), or blank if timezone not determinable  %Z",
01086         "(%%a)          locale's abbreviated weekday name (Sun..Sat)  %a",
01087         "(%%b)            locale's abbreviated month name (Jan..Dec)  %b",
01088         "(%%c)           full date (Sat Nov  4 12:02:33 1989)%n%t%t%t  %c",
01089         "(%%d)                             day of the month (01..31)  %d",
01090         "(%%e)               day of the month, blank-padded ( 1..31)  %e",
01091         "(%%h)                                should be same as (%%b)  %h",
01092         "(%%j)                            day of the year (001..366)  %j",
01093         "(%%k)               hour, 24-hour clock, blank pad ( 0..23)  %k",
01094         "(%%l)               hour, 12-hour clock, blank pad ( 1..12)  %l",
01095         "(%%m)                                        month (01..12)  %m",
01096         "(%%p)              locale's AM or PM based on 12-hour clock  %p",
01097         "(%%r)                   time, 12-hour (same as %%I:%%M:%%S %%p)  %r",
01098         "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7]   %u",
01099         "(%%v)                                VMS date (dd-bbb-YYYY)  %v",
01100         "(%%w)                       day of week (0..6, Sunday == 0)  %w",
01101         "(%%x)                appropriate locale date representation  %x",
01102         "(%%y)                      last two digits of year (00..99)  %y",
01103         "(%%z)      timezone offset east of GMT as HHMM (e.g. -0500)  %z",
01104         (char *) NULL
01105 };
01106 
01107 /* main routine. */
01108 
01109 int
01110 main(argc, argv)
01111 int argc;
01112 char **argv;
01113 {
01114         long time();
01115 
01116         char *next;
01117         char string[MAXTIME];
01118 
01119         int k;
01120         int length;
01121 
01122         struct tm *tm;
01123 
01124         long clock;
01125 
01126         /* Call the function. */
01127 
01128         clock = time((long *) 0);
01129         tm = localtime(&clock);
01130 
01131         for (k = 0; next = array[k]; k++) {
01132                 length = strftime(string, MAXTIME, next, tm);
01133                 printf("%s\n", string);
01134         }
01135 
01136         exit(0);
01137 }
01138 #endif  /* TEST_STRFTIME */
01139