Ruby: ext/date/date_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 "date_tmx.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 0
00101 #if !defined __STDC__ && !defined _WIN32
00102 #define const   
00103 static int weeknumber();
00104 adddecl(static int iso8601wknum();)
00105 static int weeknumber_v();
00106 adddecl(static int iso8601wknum_v();)
00107 #else
00108 static int weeknumber(const struct tm *timeptr, int firstweekday);
00109 adddecl(static int iso8601wknum(const struct tm *timeptr);)
00110 static int weeknumber_v(const struct tmx *tmx, int firstweekday);
00111 adddecl(static int iso8601wknum_v(const struct tmx *tmx);)
00112 #endif
00113 #endif
00114 
00115 #ifdef STDC_HEADERS
00116 #include <stdlib.h>
00117 #include <string.h>
00118 #else
00119 extern void *malloc();
00120 extern void *realloc();
00121 extern char *getenv();
00122 extern char *strchr();
00123 #endif
00124 
00125 #define range(low, item, hi)    max((low), min((item), (hi)))
00126 
00127 #undef min      /* just in case */
00128 
00129 /* min --- return minimum of two numbers */
00130 
00131 #ifndef __STDC__
00132 static inline int
00133 min(a, b)
00134 int a, b;
00135 #else
00136 static inline int
00137 min(int a, int b)
00138 #endif
00139 {
00140         return (a < b ? a : b);
00141 }
00142 
00143 #undef max      /* also, just in case */
00144 
00145 /* max --- return maximum of two numbers */
00146 
00147 #ifndef __STDC__
00148 static inline int
00149 max(a, b)
00150 int a, b;
00151 #else
00152 static inline int
00153 max(int a, int b)
00154 #endif
00155 {
00156         return (a > b ? a : b);
00157 }
00158 
00159 #ifdef NO_STRING_LITERAL_CONCATENATION
00160 #error No string literal concatenation
00161 #endif
00162 
00163 #define add(x,y) (rb_funcall((x), '+', 1, (y)))
00164 #define sub(x,y) (rb_funcall((x), '-', 1, (y)))
00165 #define mul(x,y) (rb_funcall((x), '*', 1, (y)))
00166 #define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y)))
00167 #define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y)))
00168 #define mod(x,y) (rb_funcall((x), '%', 1, (y)))
00169 
00170 /* strftime --- produce formatted time */
00171 
00172 static size_t
00173 date_strftime_with_tmx(char *s, size_t maxsize, const char *format,
00174                        const struct tmx *tmx)
00175 {
00176         char *endp = s + maxsize;
00177         char *start = s;
00178         const char *sp, *tp;
00179         auto char tbuf[100];
00180         long off;
00181         ptrdiff_t i;
00182         int w;
00183         int precision, flags, colons;
00184         char padding;
00185         enum {LEFT, CHCASE, LOWER, UPPER, LOCALE_O, LOCALE_E};
00186 #define BIT_OF(n) (1U<<(n))
00187 
00188         /* various tables, useful in North America */
00189         static const char days_l[][10] = {
00190                 "Sunday", "Monday", "Tuesday", "Wednesday",
00191                 "Thursday", "Friday", "Saturday",
00192         };
00193         static const char months_l[][10] = {
00194                 "January", "February", "March", "April",
00195                 "May", "June", "July", "August", "September",
00196                 "October", "November", "December",
00197         };
00198         static const char ampm[][3] = { "AM", "PM", };
00199 
00200         if (s == NULL || format == NULL || tmx == NULL || maxsize == 0)
00201                 return 0;
00202 
00203         /* quick check if we even need to bother */
00204         if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) {
00205         err:
00206                 errno = ERANGE;
00207                 return 0;
00208         }
00209 
00210         for (; *format && s < endp - 1; format++) {
00211 #define FLAG_FOUND() do { \
00212                         if (precision > 0 || flags & (BIT_OF(LOCALE_E)|BIT_OF(LOCALE_O))) \
00213                                 goto unknown; \
00214                 } while (0)
00215 #define NEEDS(n) do if (s >= endp || (n) >= endp - s - 1) goto err; while (0)
00216 #define FILL_PADDING(i) do { \
00217         if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \
00218                 NEEDS(precision); \
00219                 memset(s, padding ? padding : ' ', precision - (i)); \
00220                 s += precision - (i); \
00221         } \
00222         else { \
00223                 NEEDS(i); \
00224         } \
00225 } while (0);
00226 #define FMT(def_pad, def_prec, fmt, val) \
00227                 do { \
00228                         int l; \
00229                         if (precision <= 0) precision = (def_prec); \
00230                         if (flags & BIT_OF(LEFT)) precision = 1; \
00231                         l = snprintf(s, endp - s, \
00232                                      ((padding == '0' || (!padding && (def_pad) == '0')) ? "%0*"fmt : "%*"fmt), \
00233                                      precision, (val)); \
00234                         if (l < 0) goto err; \
00235                         s += l; \
00236                 } while (0)
00237 #define STRFTIME(fmt) \
00238                 do { \
00239                         i = date_strftime_with_tmx(s, endp - s, (fmt), tmx); \
00240                         if (!i) return 0; \
00241                         if (precision > i) {\
00242                                 if (start + maxsize < s + precision) { \
00243                                         errno = ERANGE; \
00244                                         return 0; \
00245                                 } \
00246                                 memmove(s + precision - i, s, i);\
00247                                 memset(s, padding ? padding : ' ', precision - i); \
00248                                 s += precision; \
00249                         }\
00250                         else s += i; \
00251                 } while (0)
00252 #define FMTV(def_pad, def_prec, fmt, val) \
00253                 do { \
00254                         VALUE tmp = (val); \
00255                         if (FIXNUM_P(tmp)) { \
00256                                 FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
00257                         } \
00258                         else { \
00259                                 VALUE args[2], result; \
00260                                 size_t l; \
00261                                 if (precision <= 0) precision = (def_prec); \
00262                                 if (flags & BIT_OF(LEFT)) precision = 1; \
00263                                 args[0] = INT2FIX(precision); \
00264                                 args[1] = (val); \
00265                                 if (padding == '0' || (!padding && (def_pad) == '0')) \
00266                                         result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \
00267                                 else \
00268                                         result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \
00269                                 l = strlcpy(s, StringValueCStr(result), endp-s); \
00270                                 if ((size_t)(endp-s) <= l) \
00271                                         goto err; \
00272                                 s += l; \
00273                         } \
00274                 } while (0)
00275 
00276                 if (*format != '%') {
00277                         *s++ = *format;
00278                         continue;
00279                 }
00280                 tp = tbuf;
00281                 sp = format;
00282                 precision = -1;
00283                 flags = 0;
00284                 padding = 0;
00285                 colons = 0;
00286         again:
00287                 switch (*++format) {
00288                 case '\0':
00289                         format--;
00290                         goto unknown;
00291 
00292                 case '%':
00293                         FILL_PADDING(1);
00294                         *s++ = '%';
00295                         continue;
00296 
00297                 case 'a':       /* abbreviated weekday name */
00298                         if (flags & BIT_OF(CHCASE)) {
00299                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00300                                 flags |= BIT_OF(UPPER);
00301                         }
00302                         {
00303                                 int wday = tmx_wday;
00304                                 if (wday < 0 || wday > 6)
00305                                         i = 1, tp = "?";
00306                                 else
00307                                         i = 3, tp = days_l[wday];
00308                         }
00309                         break;
00310 
00311                 case 'A':       /* full weekday name */
00312                         if (flags & BIT_OF(CHCASE)) {
00313                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00314                                 flags |= BIT_OF(UPPER);
00315                         }
00316                         {
00317                                 int wday = tmx_wday;
00318                                 if (wday < 0 || wday > 6)
00319                                         i = 1, tp = "?";
00320                                 else
00321                                         i = strlen(tp = days_l[wday]);
00322                         }
00323                         break;
00324 
00325 #ifdef SYSV_EXT
00326                 case 'h':       /* abbreviated month name */
00327 #endif
00328                 case 'b':       /* abbreviated month name */
00329                         if (flags & BIT_OF(CHCASE)) {
00330                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00331                                 flags |= BIT_OF(UPPER);
00332                         }
00333                         {
00334                                 int mon = tmx_mon;
00335                                 if (mon < 1 || mon > 12)
00336                                         i = 1, tp = "?";
00337                                 else
00338                                         i = 3, tp = months_l[mon-1];
00339                         }
00340                         break;
00341 
00342                 case 'B':       /* full month name */
00343                         if (flags & BIT_OF(CHCASE)) {
00344                                 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
00345                                 flags |= BIT_OF(UPPER);
00346                         }
00347                         {
00348                                 int mon = tmx_mon;
00349                                 if (mon < 1 || mon > 12)
00350                                         i = 1, tp = "?";
00351                                 else
00352                                         i = strlen(tp = months_l[mon-1]);
00353                         }
00354                         break;
00355 
00356                 case 'c':       /* appropriate date and time representation */
00357                         STRFTIME("%a %b %e %H:%M:%S %Y");
00358                         continue;
00359 
00360                 case 'd':       /* day of the month, 01 - 31 */
00361                         i = range(1, tmx_mday, 31);
00362                         FMT('0', 2, "d", (int)i);
00363                         continue;
00364 
00365                 case 'H':       /* hour, 24-hour clock, 00 - 23 */
00366                         i = range(0, tmx_hour, 23);
00367                         FMT('0', 2, "d", (int)i);
00368                         continue;
00369 
00370                 case 'I':       /* hour, 12-hour clock, 01 - 12 */
00371                         i = range(0, tmx_hour, 23);
00372                         if (i == 0)
00373                                 i = 12;
00374                         else if (i > 12)
00375                                 i -= 12;
00376                         FMT('0', 2, "d", (int)i);
00377                         continue;
00378 
00379                 case 'j':       /* day of the year, 001 - 366 */
00380                         FMT('0', 3, "d", tmx_yday);
00381                         continue;
00382 
00383                 case 'm':       /* month, 01 - 12 */
00384                         i = range(1, tmx_mon, 12);
00385                         FMT('0', 2, "d", (int)i);
00386                         continue;
00387 
00388                 case 'M':       /* minute, 00 - 59 */
00389                         i = range(0, tmx_min, 59);
00390                         FMT('0', 2, "d", (int)i);
00391                         continue;
00392 
00393                 case 'p':       /* AM or PM based on 12-hour clock */
00394                 case 'P':       /* am or pm based on 12-hour clock */
00395                         if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
00396                             (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
00397                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
00398                                 flags |= BIT_OF(LOWER);
00399                         }
00400                         i = range(0, tmx_hour, 23);
00401                         if (i < 12)
00402                                 tp = ampm[0];
00403                         else
00404                                 tp = ampm[1];
00405                         i = 2;
00406                         break;
00407 
00408                 case 's':
00409                         FMTV('0', 1, "d", tmx_secs);
00410                         continue;
00411 
00412                 case 'Q':
00413                         FMTV('0', 1, "d", tmx_msecs);
00414                         continue;
00415 
00416                 case 'S':       /* second, 00 - 59 */
00417                         i = range(0, tmx_sec, 59);
00418                         FMT('0', 2, "d", (int)i);
00419                         continue;
00420 
00421                 case 'U':       /* week of year, Sunday is first day of week */
00422                         FMT('0', 2, "d", tmx_wnum0);
00423                         continue;
00424 
00425                 case 'w':       /* weekday, Sunday == 0, 0 - 6 */
00426                         i = range(0, tmx_wday, 6);
00427                         FMT('0', 1, "d", (int)i);
00428                         continue;
00429 
00430                 case 'W':       /* week of year, Monday is first day of week */
00431                         FMT('0', 2, "d", tmx_wnum1);
00432                         continue;
00433 
00434                 case 'x':       /* appropriate date representation */
00435                         STRFTIME("%m/%d/%y");
00436                         continue;
00437 
00438                 case 'X':       /* appropriate time representation */
00439                         STRFTIME("%H:%M:%S");
00440                         continue;
00441 
00442                 case 'y':       /* year without a century, 00 - 99 */
00443                         i = NUM2INT(mod(tmx_year, INT2FIX(100)));
00444                         FMT('0', 2, "d", (int)i);
00445                         continue;
00446 
00447                 case 'Y':       /* year with century */
00448                         {
00449                                 VALUE year = tmx_year;
00450                                 if (FIXNUM_P(year)) {
00451                                         long y = FIX2LONG(year);
00452                                         FMT('0', 0 <= y ? 4 : 5, "ld", y);
00453                                 }
00454                                 else {
00455                                         FMTV('0', 4, "d", year);
00456                                 }
00457                         }
00458                         continue;
00459 
00460 #ifdef MAILHEADER_EXT
00461                 case 'z':       /* time zone offset east of GMT e.g. -0600 */
00462                         {
00463                                 long aoff;
00464                                 int hl, hw;
00465 
00466                                 off = NUM2LONG(rb_funcall(tmx_offset, rb_intern("round"), 0));
00467 
00468                                 aoff = off;
00469                                 if (aoff < 0)
00470                                         aoff = -off;
00471 
00472                                 if ((aoff / 3600) < 10)
00473                                         hl = 1;
00474                                 else
00475                                         hl = 2;
00476                                 hw = 2;
00477                                 if (flags & BIT_OF(LEFT) && hl == 1)
00478                                         hw = 1;
00479 
00480                                 switch (colons) {
00481                                 case 0: /* %z -> +hhmm */
00482                                         precision = precision <= (3 + hw) ? hw : precision-3;
00483                                         NEEDS(precision + 3);
00484                                         break;
00485 
00486                                 case 1: /* %:z -> +hh:mm */
00487                                         precision = precision <= (4 + hw) ? hw : precision-4;
00488                                         NEEDS(precision + 4);
00489                                         break;
00490 
00491                                 case 2: /* %::z -> +hh:mm:ss */
00492                                         precision = precision <= (7 + hw) ? hw : precision-7;
00493                                         NEEDS(precision + 7);
00494                                         break;
00495 
00496                                 case 3: /* %:::z -> +hh[:mm[:ss]] */
00497                                 {
00498                                         if (aoff % 3600 == 0) {
00499                                                 precision = precision <= (1 + hw) ? hw : precision-1;
00500                                                 NEEDS(precision + 3);
00501                                         }
00502                                         else if (aoff % 60 == 0) {
00503                                                 precision = precision <= (4 + hw) ? hw : precision-4;
00504                                                 NEEDS(precision + 4);
00505                                         }
00506                                         else {
00507                                                 precision = precision <= (7 + hw) ? hw : precision-7;
00508                                                 NEEDS(precision + 7);
00509                                         }
00510                                 }
00511                                 break;
00512 
00513                                 default:
00514                                         format--;
00515                                         goto unknown;
00516                                 }
00517                                 if (padding == ' ' && precision > hl) {
00518                                         i = snprintf(s, endp - s, "%*s", precision - hl, "");
00519                                         precision = hl;
00520                                         if (i < 0) goto err;
00521                                         s += i;
00522                                 }
00523                                 if (off < 0) {
00524                                         off = -off;
00525                                         *s++ = '-';
00526                                 } else {
00527                                         *s++ = '+';
00528                                 }
00529                                 i = snprintf(s, endp - s, "%.*ld", precision, off / 3600);
00530                                 if (i < 0) goto err;
00531                                 s += i;
00532                                 off = off % 3600;
00533                                 if (colons == 3 && off == 0)
00534                                         continue;
00535                                 if (1 <= colons)
00536                                         *s++ = ':';
00537                                 i = snprintf(s, endp - s, "%02d", (int)(off / 60));
00538                                 if (i < 0) goto err;
00539                                 s += i;
00540                                 off = off % 60;
00541                                 if (colons == 3 && off == 0)
00542                                         continue;
00543                                 if (2 <= colons) {
00544                                         *s++ = ':';
00545                                         i = snprintf(s, endp - s, "%02d", (int)off);
00546                                         if (i < 0) goto err;
00547                                         s += i;
00548                                 }
00549                         }
00550                         continue;
00551 #endif /* MAILHEADER_EXT */
00552 
00553                 case 'Z':       /* time zone name or abbreviation */
00554                         if (flags & BIT_OF(CHCASE)) {
00555                                 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
00556                                 flags |= BIT_OF(LOWER);
00557                         }
00558                         {
00559                                 char *zone = tmx_zone;
00560                                 if (zone == NULL)
00561                                         tp = "";
00562                                 else
00563                                         tp = zone;
00564                                 i = strlen(tp);
00565                         }
00566                         break;
00567 
00568 #ifdef SYSV_EXT
00569                 case 'n':       /* same as \n */
00570                         FILL_PADDING(1);
00571                         *s++ = '\n';
00572                         continue;
00573 
00574                 case 't':       /* same as \t */
00575                         FILL_PADDING(1);
00576                         *s++ = '\t';
00577                         continue;
00578 
00579                 case 'D':       /* date as %m/%d/%y */
00580                         STRFTIME("%m/%d/%y");
00581                         continue;
00582 
00583                 case 'e':       /* day of month, blank padded */
00584                         FMT(' ', 2, "d", range(1, tmx_mday, 31));
00585                         continue;
00586 
00587                 case 'r':       /* time as %I:%M:%S %p */
00588                         STRFTIME("%I:%M:%S %p");
00589                         continue;
00590 
00591                 case 'R':       /* time as %H:%M */
00592                         STRFTIME("%H:%M");
00593                         continue;
00594 
00595                 case 'T':       /* time as %H:%M:%S */
00596                         STRFTIME("%H:%M:%S");
00597                         continue;
00598 #endif
00599 
00600 #ifdef SUNOS_EXT
00601                 case 'k':       /* hour, 24-hour clock, blank pad */
00602                         i = range(0, tmx_hour, 23);
00603                         FMT(' ', 2, "d", (int)i);
00604                         continue;
00605 
00606                 case 'l':       /* hour, 12-hour clock, 1 - 12, blank pad */
00607                         i = range(0, tmx_hour, 23);
00608                         if (i == 0)
00609                                 i = 12;
00610                         else if (i > 12)
00611                                 i -= 12;
00612                         FMT(' ', 2, "d", (int)i);
00613                         continue;
00614 #endif
00615 
00616 #ifdef VMS_EXT
00617                 case 'v':       /* date as dd-bbb-YYYY */
00618                         STRFTIME("%e-%b-%Y");
00619                         continue;
00620 #endif
00621 
00622 #ifdef POSIX2_DATE
00623                 case 'C':
00624                         FMTV('0', 2, "d", div(tmx_year, INT2FIX(100)));
00625                         continue;
00626 
00627                 case 'E':
00628                         /* POSIX locale extensions, ignored for now */
00629                         flags |= BIT_OF(LOCALE_E);
00630                         if (*(format + 1) && strchr("cCxXyY", *(format + 1)))
00631                                 goto again;
00632                         goto unknown;
00633                 case 'O':
00634                         /* POSIX locale extensions, ignored for now */
00635                         flags |= BIT_OF(LOCALE_O);
00636                         if (*(format + 1) && strchr("deHImMSuUVwWy",
00637                                                     *(format + 1)))
00638                                 goto again;
00639                         goto unknown;
00640                 case 'V':       /* week of year according ISO 8601 */
00641                         FMT('0', 2, "d", tmx_cweek);
00642                         continue;
00643 
00644                 case 'u':
00645                 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
00646                         FMT('0', 1, "d", tmx_cwday);
00647                         continue;
00648 #endif  /* POSIX2_DATE */
00649 
00650 #ifdef ISO_DATE_EXT
00651                 case 'g':       /* year of ISO week without a century */
00652                         i = NUM2INT(mod(tmx_cwyear, INT2FIX(100)));
00653                         FMT('0', 2, "d", (int)i);
00654                         continue;
00655 
00656                 case 'G':       /* year of ISO week with century */
00657                         {
00658                                 VALUE year = tmx_cwyear;
00659                                 if (FIXNUM_P(year)) {
00660                                         long y = FIX2LONG(year);
00661                                         FMT('0', 0 <= y ? 4 : 5, "ld", y);
00662                                 }
00663                                 else {
00664                                         FMTV('0', 4, "d", year);
00665                                 }
00666                                 continue;
00667                         }
00668 
00669 #endif /* ISO_DATE_EXT */
00670 
00671                 case 'L':
00672                         w = 3;
00673                         goto subsec;
00674 
00675                 case 'N':
00676                         /*
00677                          * fractional second digits. default is 9 digits
00678                          * (nanosecond).
00679                          *
00680                          * %3N  millisecond (3 digits)
00681                          * %6N  microsecond (6 digits)
00682                          * %9N  nanosecond (9 digits)
00683                          */
00684                         w = 9;
00685                 subsec:
00686                         if (precision <= 0) {
00687                             precision = w;
00688                         }
00689                         NEEDS(precision);
00690 
00691                         {
00692                                 VALUE subsec = tmx_sec_fraction;
00693                                 int ww;
00694                                 long n;
00695 
00696                                 ww = precision;
00697                                 while (9 <= ww) {
00698                                         subsec = mul(subsec, INT2FIX(1000000000));
00699                                         ww -= 9;
00700                                 }
00701                                 n = 1;
00702                                 for (; 0 < ww; ww--)
00703                                         n *= 10;
00704                                 if (n != 1)
00705                                         subsec = mul(subsec, INT2FIX(n));
00706                                 subsec = div(subsec, INT2FIX(1));
00707 
00708                                 if (FIXNUM_P(subsec)) {
00709                                         (void)snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
00710                                         s += precision;
00711                                 }
00712                                 else {
00713                                         VALUE args[2], result;
00714                                         args[0] = INT2FIX(precision);
00715                                         args[1] = subsec;
00716                                         result = rb_str_format(2, args, rb_str_new2("%0*d"));
00717                                         (void)strlcpy(s, StringValueCStr(result), endp-s);
00718                                         s += precision;
00719                                 }
00720                         }
00721                         continue;
00722 
00723                 case 'F':       /*  Equivalent to %Y-%m-%d */
00724                         STRFTIME("%Y-%m-%d");
00725                         continue;
00726                 case '+':
00727                         STRFTIME("%a %b %e %H:%M:%S %Z %Y");
00728                         continue;
00729 
00730                 case '-':
00731                         FLAG_FOUND();
00732                         flags |= BIT_OF(LEFT);
00733                         padding = precision = 0;
00734                         goto again;
00735 
00736                 case '^':
00737                         FLAG_FOUND();
00738                         flags |= BIT_OF(UPPER);
00739                         goto again;
00740 
00741                 case '#':
00742                         FLAG_FOUND();
00743                         flags |= BIT_OF(CHCASE);
00744                         goto again;
00745 
00746                 case '_':
00747                         FLAG_FOUND();
00748                         padding = ' ';
00749                         goto again;
00750 
00751                 case ':':
00752                         colons++;
00753                         goto again;
00754 
00755                 case '0':
00756                         padding = '0';
00757                 case '1':  case '2': case '3': case '4':
00758                 case '5': case '6':  case '7': case '8': case '9':
00759                         {
00760                                 char *e;
00761                                 precision = (int)strtoul(format, &e, 10);
00762                                 format = e - 1;
00763                                 goto again;
00764                         }
00765 
00766                 default:
00767                 unknown:
00768                         i = format - sp + 1;
00769                         tp = sp;
00770                         precision = -1;
00771                         flags = 0;
00772                         padding = 0;
00773                         colons = 0;
00774                         break;
00775                 }
00776                 if (i) {
00777                         FILL_PADDING(i);
00778                         memcpy(s, tp, i);
00779                         switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
00780                         case BIT_OF(UPPER):
00781                                 do {
00782                                         if (ISLOWER(*s)) *s = TOUPPER(*s);
00783                                 } while (s++, --i);
00784                                 break;
00785                         case BIT_OF(LOWER):
00786                                 do {
00787                                         if (ISUPPER(*s)) *s = TOLOWER(*s);
00788                                 } while (s++, --i);
00789                                 break;
00790                         default:
00791                                 s += i;
00792                                 break;
00793                         }
00794                 }
00795         }
00796         if (s >= endp) {
00797                 goto err;
00798         }
00799         if (*format == '\0') {
00800                 *s = '\0';
00801                 return (s - start);
00802         } else
00803                 return 0;
00804 }
00805 
00806 size_t
00807 date_strftime(char *s, size_t maxsize, const char *format,
00808               const struct tmx *tmx)
00809 {
00810         return date_strftime_with_tmx(s, maxsize, format, tmx);
00811 }
00812 
00813 #if 0
00814 /* isleap --- is a year a leap year? */
00815 
00816 #ifndef __STDC__
00817 static int
00818 isleap(year)
00819 long year;
00820 #else
00821 static int
00822 isleap(long year)
00823 #endif
00824 {
00825         return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
00826 }
00827 
00828 static void
00829 tmx2tm_noyear(const struct tmx *tmx, struct tm *result)
00830 {
00831     struct tm tm;
00832 
00833     /* for isleap() in iso8601wknum.  +100 is -1900 (mod 400). */
00834     tm.tm_year = FIX2INT(mod(tmx_year, INT2FIX(400))) + 100;
00835 
00836     tm.tm_mon = tmx_mon-1;
00837     tm.tm_mday = tmx_mday;
00838     tm.tm_hour = tmx_hour;
00839     tm.tm_min = tmx_min;
00840     tm.tm_sec = tmx_sec;
00841     tm.tm_wday = tmx_wday;
00842     tm.tm_yday = tmx_yday-1;
00843     tm.tm_isdst = 0;
00844 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
00845     tm.tm_gmtoff = NUM2LONG(tmx_offset);
00846 #endif
00847 #if defined(HAVE_TM_ZONE)
00848     tm.tm_zone = (char *)tmx_zone;
00849 #endif
00850     *result = tm;
00851 }
00852 
00853 #ifdef POSIX2_DATE
00854 /* iso8601wknum --- compute week number according to ISO 8601 */
00855 
00856 #ifndef __STDC__
00857 static int
00858 iso8601wknum(timeptr)
00859 const struct tm *timeptr;
00860 #else
00861 static int
00862 iso8601wknum(const struct tm *timeptr)
00863 #endif
00864 {
00865         /*
00866          * From 1003.2:
00867          *      If the week (Monday to Sunday) containing January 1
00868          *      has four or more days in the new year, then it is week 1;
00869          *      otherwise it is the highest numbered week of the previous
00870          *      year (52 or 53), and the next week is week 1.
00871          *
00872          * ADR: This means if Jan 1 was Monday through Thursday,
00873          *      it was week 1, otherwise week 52 or 53.
00874          *
00875          * XPG4 erroneously included POSIX.2 rationale text in the
00876          * main body of the standard. Thus it requires week 53.
00877          */
00878 
00879         int weeknum, jan1day;
00880 
00881         /* get week number, Monday as first day of the week */
00882         weeknum = weeknumber(timeptr, 1);
00883 
00884         /*
00885          * With thanks and tip of the hatlo to tml@tik.vtt.fi
00886          *
00887          * What day of the week does January 1 fall on?
00888          * We know that
00889          *      (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
00890          *              (timeptr->tm_wday - jan1.tm_wday) MOD 7
00891          * and that
00892          *      jan1.tm_yday == 0
00893          * and that
00894          *      timeptr->tm_wday MOD 7 == timeptr->tm_wday
00895          * from which it follows that. . .
00896          */
00897         jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
00898         if (jan1day < 0)
00899                 jan1day += 7;
00900 
00901         /*
00902          * If Jan 1 was a Monday through Thursday, it was in
00903          * week 1.  Otherwise it was last year's highest week, which is
00904          * this year's week 0.
00905          *
00906          * What does that mean?
00907          * If Jan 1 was Monday, the week number is exactly right, it can
00908          *      never be 0.
00909          * If it was Tuesday through Thursday, the weeknumber is one
00910          *      less than it should be, so we add one.
00911          * Otherwise, Friday, Saturday or Sunday, the week number is
00912          * OK, but if it is 0, it needs to be 52 or 53.
00913          */
00914         switch (jan1day) {
00915         case 1:         /* Monday */
00916                 break;
00917         case 2:         /* Tuesday */
00918         case 3:         /* Wednesday */
00919         case 4:         /* Thursday */
00920                 weeknum++;
00921                 break;
00922         case 5:         /* Friday */
00923         case 6:         /* Saturday */
00924         case 0:         /* Sunday */
00925                 if (weeknum == 0) {
00926 #ifdef USE_BROKEN_XPG4
00927                         /* XPG4 (as of March 1994) says 53 unconditionally */
00928                         weeknum = 53;
00929 #else
00930                         /* get week number of last week of last year */
00931                         struct tm dec31ly;      /* 12/31 last year */
00932                         dec31ly = *timeptr;
00933                         dec31ly.tm_year--;
00934                         dec31ly.tm_mon = 11;
00935                         dec31ly.tm_mday = 31;
00936                         dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
00937                         dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
00938                         weeknum = iso8601wknum(& dec31ly);
00939 #endif
00940                 }
00941                 break;
00942         }
00943 
00944         if (timeptr->tm_mon == 11) {
00945                 /*
00946                  * The last week of the year
00947                  * can be in week 1 of next year.
00948                  * Sigh.
00949                  *
00950                  * This can only happen if
00951                  *      M   T  W
00952                  *      29  30 31
00953                  *      30  31
00954                  *      31
00955                  */
00956                 int wday, mday;
00957 
00958                 wday = timeptr->tm_wday;
00959                 mday = timeptr->tm_mday;
00960                 if (   (wday == 1 && (mday >= 29 && mday <= 31))
00961                     || (wday == 2 && (mday == 30 || mday == 31))
00962                     || (wday == 3 &&  mday == 31))
00963                         weeknum = 1;
00964         }
00965 
00966         return weeknum;
00967 }
00968 
00969 static int
00970 iso8601wknum_v(const struct tmx *tmx)
00971 {
00972         struct tm tm;
00973         tmx2tm_noyear(tmx, &tm);
00974         return iso8601wknum(&tm);
00975 }
00976 
00977 #endif
00978 
00979 /* weeknumber --- figure how many weeks into the year */
00980 
00981 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
00982 
00983 #ifndef __STDC__
00984 static int
00985 weeknumber(timeptr, firstweekday)
00986 const struct tm *timeptr;
00987 int firstweekday;
00988 #else
00989 static int
00990 weeknumber(const struct tm *timeptr, int firstweekday)
00991 #endif
00992 {
00993         int wday = timeptr->tm_wday;
00994         int ret;
00995 
00996         if (firstweekday == 1) {
00997                 if (wday == 0)  /* sunday */
00998                         wday = 6;
00999                 else
01000                         wday--;
01001         }
01002         ret = ((timeptr->tm_yday + 7 - wday) / 7);
01003         if (ret < 0)
01004                 ret = 0;
01005         return ret;
01006 }
01007 
01008 static int
01009 weeknumber_v(const struct tmx *tmx, int firstweekday)
01010 {
01011         struct tm tm;
01012         tmx2tm_noyear(tmx, &tm);
01013         return weeknumber(&tm, firstweekday);
01014 }
01015 #endif
01016 
01017 #if 0
01018 /* ADR --- I'm loathe to mess with ado's code ... */
01019 
01020 Date:         Wed, 24 Apr 91 20:54:08 MDT
01021 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
01022 To: arnold@audiofax.com
01023 
01024 Hi Arnold,
01025 in a process of fixing of strftime() in libraries on Atari ST I grabbed
01026 some pieces of code from your own strftime.  When doing that it came
01027 to mind that your weeknumber() function compiles a little bit nicer
01028 in the following form:
01029 /*
01030  * firstweekday is 0 if starting in Sunday, non-zero if in Monday
01031  */
01032 {
01033     return (timeptr->tm_yday - timeptr->tm_wday +
01034             (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
01035 }
01036 How nicer it depends on a compiler, of course, but always a tiny bit.
01037 
01038    Cheers,
01039    Michal
01040    ntomczak@vm.ucs.ualberta.ca
01041 #endif
01042 
01043 #ifdef  TEST_STRFTIME
01044 
01045 /*
01046  * NAME:
01047  *      tst
01048  *
01049  * SYNOPSIS:
01050  *      tst
01051  *
01052  * DESCRIPTION:
01053  *      "tst" is a test driver for the function "strftime".
01054  *
01055  * OPTIONS:
01056  *      None.
01057  *
01058  * AUTHOR:
01059  *      Karl Vogel
01060  *      Control Data Systems, Inc.
01061  *      vogelke@c-17igp.wpafb.af.mil
01062  *
01063  * BUGS:
01064  *      None noticed yet.
01065  *
01066  * COMPILE:
01067  *      cc -o tst -DTEST_STRFTIME strftime.c
01068  */
01069 
01070 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
01071 
01072 #ifndef NULL
01073 #include        <stdio.h>
01074 #endif
01075 #include        <time.h>
01076 #include        <sys/time.h>
01077 #include        <string.h>
01078 
01079 #define         MAXTIME         132
01080 
01081 /*
01082  * Array of time formats.
01083  */
01084 
01085 static char *array[] =
01086 {
01087         "(%%A)      full weekday name, var length (Sunday..Saturday)  %A",
01088         "(%%B)       full month name, var length (January..December)  %B",
01089         "(%%C)                                               Century  %C",
01090         "(%%D)                                       date (%%m/%%d/%%y)  %D",
01091         "(%%E)                           Locale extensions (ignored)  %E",
01092         "(%%H)                          hour (24-hour clock, 00..23)  %H",
01093         "(%%I)                          hour (12-hour clock, 01..12)  %I",
01094         "(%%M)                                       minute (00..59)  %M",
01095         "(%%O)                           Locale extensions (ignored)  %O",
01096         "(%%R)                                 time, 24-hour (%%H:%%M)  %R",
01097         "(%%S)                                       second (00..60)  %S",
01098         "(%%T)                              time, 24-hour (%%H:%%M:%%S)  %T",
01099         "(%%U)    week of year, Sunday as first day of week (00..53)  %U",
01100         "(%%V)                    week of year according to ISO 8601  %V",
01101         "(%%W)    week of year, Monday as first day of week (00..53)  %W",
01102         "(%%X)     appropriate locale time representation (%H:%M:%S)  %X",
01103         "(%%Y)                           year with century (1970...)  %Y",
01104         "(%%Z) timezone (EDT), or blank if timezone not determinable  %Z",
01105         "(%%a)          locale's abbreviated weekday name (Sun..Sat)  %a",
01106         "(%%b)            locale's abbreviated month name (Jan..Dec)  %b",
01107         "(%%c)           full date (Sat Nov  4 12:02:33 1989)%n%t%t%t  %c",
01108         "(%%d)                             day of the month (01..31)  %d",
01109         "(%%e)               day of the month, blank-padded ( 1..31)  %e",
01110         "(%%h)                                should be same as (%%b)  %h",
01111         "(%%j)                            day of the year (001..366)  %j",
01112         "(%%k)               hour, 24-hour clock, blank pad ( 0..23)  %k",
01113         "(%%l)               hour, 12-hour clock, blank pad ( 1..12)  %l",
01114         "(%%m)                                        month (01..12)  %m",
01115         "(%%p)              locale's AM or PM based on 12-hour clock  %p",
01116         "(%%r)                   time, 12-hour (same as %%I:%%M:%%S %%p)  %r",
01117         "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7]   %u",
01118         "(%%v)                                VMS date (dd-bbb-YYYY)  %v",
01119         "(%%w)                       day of week (0..6, Sunday == 0)  %w",
01120         "(%%x)                appropriate locale date representation  %x",
01121         "(%%y)                      last two digits of year (00..99)  %y",
01122         "(%%z)      timezone offset east of GMT as HHMM (e.g. -0500)  %z",
01123         (char *) NULL
01124 };
01125 
01126 /* main routine. */
01127 
01128 int
01129 main(argc, argv)
01130 int argc;
01131 char **argv;
01132 {
01133         char *next;
01134         char string[MAXTIME];
01135 
01136         int k;
01137         int length;
01138 
01139         struct tm *tm;
01140 
01141         time_t clock;
01142 
01143         /* Call the function. */
01144 
01145         clock = time(NULL);
01146         tm = localtime(&clock);
01147 
01148         for (k = 0; next = array[k]; k++) {
01149                 length = strftime(string, MAXTIME, next, tm);
01150                 printf("%s\n", string);
01151         }
01152 
01153         exit(0);
01154 }
01155 #endif  /* TEST_STRFTIME */
01156