| /* strftime - formatted time and date to a string */ |
| /* |
| * Modified slightly by Chet Ramey for inclusion in Bash |
| */ |
| /* |
| * strftime.c |
| * |
| * Public-domain implementation of ISO C library routine. |
| * |
| * If you can't do prototypes, get GCC. |
| * |
| * The C99 standard now specifies just about all of the formats |
| * that were additional in the earlier versions of this file. |
| * |
| * For extensions from SunOS, add SUNOS_EXT. |
| * For extensions from HP/UX, add HPUX_EXT. |
| * For VMS dates, add VMS_EXT. |
| * For complete POSIX semantics, add POSIX_SEMANTICS. |
| * |
| * The code for %c, %x, and %X follows the C99 specification for |
| * the "C" locale. |
| * |
| * This version ignores LOCALE information. |
| * It also doesn't worry about multi-byte characters. |
| * So there. |
| * |
| * Arnold Robbins |
| * January, February, March, 1991 |
| * Updated March, April 1992 |
| * Updated April, 1993 |
| * Updated February, 1994 |
| * Updated May, 1994 |
| * Updated January, 1995 |
| * Updated September, 1995 |
| * Updated January, 1996 |
| * Updated July, 1997 |
| * Updated October, 1999 |
| * Updated September, 2000 |
| * Updated December, 2001 |
| * Updated January, 2011 |
| * |
| * Fixes from ado@elsie.nci.nih.gov, |
| * February 1991, May 1992 |
| * Fixes from Tor Lillqvist tml@tik.vtt.fi, |
| * May 1993 |
| * Further fixes from ado@elsie.nci.nih.gov, |
| * February 1994 |
| * %z code from chip@chinacat.unicom.com, |
| * Applied September 1995 |
| * %V code fixed (again) and %G, %g added, |
| * January 1996 |
| * %v code fixed, better configuration, |
| * July 1997 |
| * Moved to C99 specification. |
| * September 2000 |
| * Fixes from Tanaka Akira <akr@m17n.org> |
| * December 2001 |
| */ |
| #include <config.h> |
| |
| #include <stdio.h> |
| #include <ctype.h> |
| #include <time.h> |
| |
| #if defined(TM_IN_SYS_TIME) |
| #include <sys/types.h> |
| #include <sys/time.h> |
| #endif |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /* defaults: season to taste */ |
| #define SUNOS_EXT 1 /* stuff in SunOS strftime routine */ |
| #define VMS_EXT 1 /* include %v for VMS date format */ |
| #define HPUX_EXT 1 /* non-conflicting stuff in HP-UX date */ |
| #define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */ |
| |
| #undef strchr /* avoid AIX weirdness */ |
| |
| #if defined (SHELL) |
| extern char *get_string_value (const char *); |
| #endif |
| |
| extern void tzset(void); |
| static int weeknumber(const struct tm *timeptr, int firstweekday); |
| static int iso8601wknum(const struct tm *timeptr); |
| |
| #ifndef inline |
| #ifdef __GNUC__ |
| #define inline __inline__ |
| #else |
| #define inline /**/ |
| #endif |
| #endif |
| |
| #define range(low, item, hi) max(low, min(item, hi)) |
| |
| #if !defined(OS2) && !defined(MSDOS) && defined(HAVE_TZNAME) |
| extern char *tzname[2]; |
| extern int daylight; |
| #if defined(SOLARIS) || defined(mips) || defined (M_UNIX) |
| extern long int timezone, altzone; |
| #else |
| # if defined (HPUX) |
| extern long int timezone; |
| # else |
| extern int timezone, altzone; |
| # endif /* !HPUX */ |
| #endif /* !SOLARIS && !mips && !M_UNIX */ |
| #endif |
| |
| #undef min /* just in case */ |
| |
| /* format for %+ -- currently unused */ |
| #ifndef NATIONAL_FORMAT |
| #define NATIONAL_FORMAT "%a %b %e %H:%M:%S %Z %Y" |
| #endif |
| |
| /* min --- return minimum of two numbers */ |
| |
| static inline int |
| min(int a, int b) |
| { |
| return (a < b ? a : b); |
| } |
| |
| #undef max /* also, just in case */ |
| |
| /* max --- return maximum of two numbers */ |
| |
| static inline int |
| max(int a, int b) |
| { |
| return (a > b ? a : b); |
| } |
| |
| /* strftime --- produce formatted time */ |
| |
| size_t |
| strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr) |
| { |
| char *endp = s + maxsize; |
| char *start = s; |
| auto char tbuf[100]; |
| long off; |
| int i, w; |
| long y; |
| static short first = 1; |
| #ifdef POSIX_SEMANTICS |
| static char *savetz = NULL; |
| static int savetzlen = 0; |
| char *tz; |
| #endif /* POSIX_SEMANTICS */ |
| #ifndef HAVE_TM_ZONE |
| #ifndef HAVE_TM_NAME |
| #ifndef HAVE_TZNAME |
| extern char *timezone(); |
| struct timeval tv; |
| struct timezone zone; |
| #endif /* HAVE_TZNAME */ |
| #endif /* HAVE_TM_NAME */ |
| #endif /* HAVE_TM_ZONE */ |
| |
| /* various tables, useful in North America */ |
| static const char *days_a[] = { |
| "Sun", "Mon", "Tue", "Wed", |
| "Thu", "Fri", "Sat", |
| }; |
| static const char *days_l[] = { |
| "Sunday", "Monday", "Tuesday", "Wednesday", |
| "Thursday", "Friday", "Saturday", |
| }; |
| static const char *months_a[] = { |
| "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", |
| }; |
| static const char *months_l[] = { |
| "January", "February", "March", "April", |
| "May", "June", "July", "August", "September", |
| "October", "November", "December", |
| }; |
| static const char *ampm[] = { "AM", "PM", }; |
| |
| if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0) |
| return 0; |
| |
| /* quick check if we even need to bother */ |
| if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) |
| return 0; |
| |
| #ifndef POSIX_SEMANTICS |
| if (first) { |
| tzset(); |
| first = 0; |
| } |
| #else /* POSIX_SEMANTICS */ |
| #if defined (SHELL) |
| tz = get_string_value ("TZ"); |
| #else |
| tz = getenv("TZ"); |
| #endif |
| if (first) { |
| if (tz != NULL) { |
| int tzlen = strlen(tz); |
| |
| savetz = (char *) malloc(tzlen + 1); |
| if (savetz != NULL) { |
| savetzlen = tzlen + 1; |
| strcpy(savetz, tz); |
| } |
| } |
| tzset(); |
| first = 0; |
| } |
| /* if we have a saved TZ, and it is different, recapture and reset */ |
| if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) { |
| i = strlen(tz) + 1; |
| if (i > savetzlen) { |
| savetz = (char *) realloc(savetz, i); |
| if (savetz) { |
| savetzlen = i; |
| strcpy(savetz, tz); |
| } |
| } else |
| strcpy(savetz, tz); |
| tzset(); |
| } |
| #endif /* POSIX_SEMANTICS */ |
| |
| for (; *format && s < endp - 1; format++) { |
| tbuf[0] = '\0'; |
| if (*format != '%') { |
| *s++ = *format; |
| continue; |
| } |
| again: |
| switch (*++format) { |
| case '\0': |
| *s++ = '%'; |
| goto out; |
| |
| case '%': |
| *s++ = '%'; |
| continue; |
| |
| case 'a': /* abbreviated weekday name */ |
| if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) |
| strcpy(tbuf, "?"); |
| else |
| strcpy(tbuf, days_a[timeptr->tm_wday]); |
| break; |
| |
| case 'A': /* full weekday name */ |
| if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) |
| strcpy(tbuf, "?"); |
| else |
| strcpy(tbuf, days_l[timeptr->tm_wday]); |
| break; |
| |
| case 'b': /* abbreviated month name */ |
| short_month: |
| if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) |
| strcpy(tbuf, "?"); |
| else |
| strcpy(tbuf, months_a[timeptr->tm_mon]); |
| break; |
| |
| case 'B': /* full month name */ |
| if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) |
| strcpy(tbuf, "?"); |
| else |
| strcpy(tbuf, months_l[timeptr->tm_mon]); |
| break; |
| |
| case 'c': /* appropriate date and time representation */ |
| /* |
| * This used to be: |
| * |
| * strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr); |
| * |
| * Now, per the ISO 1999 C standard, it this: |
| */ |
| strftime(tbuf, sizeof tbuf, "%A %B %d %T %Y", timeptr); |
| break; |
| |
| case 'C': |
| century: |
| sprintf(tbuf, "%02ld", (timeptr->tm_year + 1900L) / 100); |
| break; |
| |
| case 'd': /* day of the month, 01 - 31 */ |
| i = range(1, timeptr->tm_mday, 31); |
| sprintf(tbuf, "%02d", i); |
| break; |
| |
| case 'D': /* date as %m/%d/%y */ |
| strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr); |
| break; |
| |
| case 'e': /* day of month, blank padded */ |
| sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31)); |
| break; |
| |
| case 'E': |
| /* POSIX (now C99) locale extensions, ignored for now */ |
| goto again; |
| |
| case 'F': /* ISO 8601 date representation */ |
| strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr); |
| break; |
| |
| case 'g': |
| case 'G': |
| /* |
| * Year of ISO week. |
| * |
| * If it's December but the ISO week number is one, |
| * that week is in next year. |
| * If it's January but the ISO week number is 52 or |
| * 53, that week is in last year. |
| * Otherwise, it's this year. |
| */ |
| w = iso8601wknum(timeptr); |
| if (timeptr->tm_mon == 11 && w == 1) |
| y = 1900L + timeptr->tm_year + 1; |
| else if (timeptr->tm_mon == 0 && w >= 52) |
| y = 1900L + timeptr->tm_year - 1; |
| else |
| y = 1900L + timeptr->tm_year; |
| |
| if (*format == 'G') |
| sprintf(tbuf, "%ld", y); |
| else |
| sprintf(tbuf, "%02ld", y % 100); |
| break; |
| |
| case 'h': /* abbreviated month name */ |
| goto short_month; |
| |
| case 'H': /* hour, 24-hour clock, 00 - 23 */ |
| i = range(0, timeptr->tm_hour, 23); |
| sprintf(tbuf, "%02d", i); |
| break; |
| |
| case 'I': /* hour, 12-hour clock, 01 - 12 */ |
| i = range(0, timeptr->tm_hour, 23); |
| if (i == 0) |
| i = 12; |
| else if (i > 12) |
| i -= 12; |
| sprintf(tbuf, "%02d", i); |
| break; |
| |
| case 'j': /* day of the year, 001 - 366 */ |
| sprintf(tbuf, "%03d", timeptr->tm_yday + 1); |
| break; |
| |
| case 'm': /* month, 01 - 12 */ |
| i = range(0, timeptr->tm_mon, 11); |
| sprintf(tbuf, "%02d", i + 1); |
| break; |
| |
| case 'M': /* minute, 00 - 59 */ |
| i = range(0, timeptr->tm_min, 59); |
| sprintf(tbuf, "%02d", i); |
| break; |
| |
| case 'n': /* same as \n */ |
| tbuf[0] = '\n'; |
| tbuf[1] = '\0'; |
| break; |
| |
| case 'O': |
| /* POSIX (now C99) locale extensions, ignored for now */ |
| goto again; |
| |
| case 'p': /* am or pm based on 12-hour clock */ |
| i = range(0, timeptr->tm_hour, 23); |
| if (i < 12) |
| strcpy(tbuf, ampm[0]); |
| else |
| strcpy(tbuf, ampm[1]); |
| break; |
| |
| case 'r': /* time as %I:%M:%S %p */ |
| strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr); |
| break; |
| |
| case 'R': /* time as %H:%M */ |
| strftime(tbuf, sizeof tbuf, "%H:%M", timeptr); |
| break; |
| |
| #if defined(HAVE_MKTIME) |
| case 's': /* time as seconds since the Epoch */ |
| { |
| struct tm non_const_timeptr; |
| |
| non_const_timeptr = *timeptr; |
| sprintf(tbuf, "%ld", mktime(& non_const_timeptr)); |
| break; |
| } |
| #endif /* defined(HAVE_MKTIME) */ |
| |
| case 'S': /* second, 00 - 60 */ |
| i = range(0, timeptr->tm_sec, 60); |
| sprintf(tbuf, "%02d", i); |
| break; |
| |
| case 't': /* same as \t */ |
| tbuf[0] = '\t'; |
| tbuf[1] = '\0'; |
| break; |
| |
| case 'T': /* time as %H:%M:%S */ |
| the_time: |
| strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr); |
| break; |
| |
| case 'u': |
| /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */ |
| sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 : |
| timeptr->tm_wday); |
| break; |
| |
| case 'U': /* week of year, Sunday is first day of week */ |
| sprintf(tbuf, "%02d", weeknumber(timeptr, 0)); |
| break; |
| |
| case 'V': /* week of year according ISO 8601 */ |
| sprintf(tbuf, "%02d", iso8601wknum(timeptr)); |
| break; |
| |
| case 'w': /* weekday, Sunday == 0, 0 - 6 */ |
| i = range(0, timeptr->tm_wday, 6); |
| sprintf(tbuf, "%d", i); |
| break; |
| |
| case 'W': /* week of year, Monday is first day of week */ |
| sprintf(tbuf, "%02d", weeknumber(timeptr, 1)); |
| break; |
| |
| case 'x': /* appropriate date representation */ |
| strftime(tbuf, sizeof tbuf, "%A %B %d %Y", timeptr); |
| break; |
| |
| case 'X': /* appropriate time representation */ |
| goto the_time; |
| break; |
| |
| case 'y': /* year without a century, 00 - 99 */ |
| year: |
| i = timeptr->tm_year % 100; |
| sprintf(tbuf, "%02d", i); |
| break; |
| |
| case 'Y': /* year with century */ |
| fullyear: |
| sprintf(tbuf, "%ld", 1900L + timeptr->tm_year); |
| break; |
| |
| /* |
| * From: Chip Rosenthal <chip@chinacat.unicom.com> |
| * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST) |
| * |
| * Warning: the %z [code] is implemented by inspecting the |
| * timezone name conditional compile settings, and |
| * inferring a method to get timezone offsets. I've tried |
| * this code on a couple of machines, but I don't doubt |
| * there is some system out there that won't like it. |
| * Maybe the easiest thing to do would be to bracket this |
| * with an #ifdef that can turn it off. The %z feature |
| * would be an admittedly obscure one that most folks can |
| * live without, but it would be a great help to those of |
| * us that muck around with various message processors. |
| */ |
| case 'z': /* time zone offset east of GMT e.g. -0600 */ |
| if (timeptr->tm_isdst < 0) |
| break; |
| #ifdef HAVE_TM_NAME |
| /* |
| * Systems with tm_name probably have tm_tzadj as |
| * secs west of GMT. Convert to mins east of GMT. |
| */ |
| off = -timeptr->tm_tzadj / 60; |
| #else /* !HAVE_TM_NAME */ |
| #ifdef HAVE_TM_ZONE |
| /* |
| * Systems with tm_zone probably have tm_gmtoff as |
| * secs east of GMT. Convert to mins east of GMT. |
| */ |
| off = timeptr->tm_gmtoff / 60; |
| #else /* !HAVE_TM_ZONE */ |
| #if HAVE_TZNAME |
| /* |
| * Systems with tzname[] probably have timezone as |
| * secs west of GMT. Convert to mins east of GMT. |
| */ |
| # ifdef HPUX |
| off = -timezone / 60; |
| # else |
| /* ADR: 4 August 2001, fixed this per gazelle@interaccess.com */ |
| off = -(daylight ? altzone : timezone) / 60; |
| # endif /* !HPUX */ |
| #else /* !HAVE_TZNAME */ |
| gettimeofday(& tv, & zone); |
| off = -zone.tz_minuteswest; |
| #endif /* !HAVE_TZNAME */ |
| #endif /* !HAVE_TM_ZONE */ |
| #endif /* !HAVE_TM_NAME */ |
| if (off < 0) { |
| tbuf[0] = '-'; |
| off = -off; |
| } else { |
| tbuf[0] = '+'; |
| } |
| sprintf(tbuf+1, "%02ld%02ld", off/60, off%60); |
| break; |
| |
| case 'Z': /* time zone name or abbrevation */ |
| #ifdef HAVE_TZNAME |
| i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */ |
| strcpy(tbuf, tzname[i]); |
| #else |
| #ifdef HAVE_TM_ZONE |
| strcpy(tbuf, timeptr->tm_zone); |
| #else |
| #ifdef HAVE_TM_NAME |
| strcpy(tbuf, timeptr->tm_name); |
| #else |
| gettimeofday(& tv, & zone); |
| strcpy(tbuf, timezone(zone.tz_minuteswest, |
| timeptr->tm_isdst > 0)); |
| #endif /* HAVE_TM_NAME */ |
| #endif /* HAVE_TM_ZONE */ |
| #endif /* HAVE_TZNAME */ |
| break; |
| |
| #ifdef SUNOS_EXT |
| case 'k': /* hour, 24-hour clock, blank pad */ |
| sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23)); |
| break; |
| |
| case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */ |
| i = range(0, timeptr->tm_hour, 23); |
| if (i == 0) |
| i = 12; |
| else if (i > 12) |
| i -= 12; |
| sprintf(tbuf, "%2d", i); |
| break; |
| #endif |
| |
| #ifdef HPUX_EXT |
| case 'N': /* Emperor/Era name */ |
| /* this is essentially the same as the century */ |
| goto century; /* %C */ |
| |
| case 'o': /* Emperor/Era year */ |
| goto year; /* %y */ |
| #endif /* HPUX_EXT */ |
| |
| |
| #ifdef VMS_EXT |
| case 'v': /* date as dd-bbb-YYYY */ |
| sprintf(tbuf, "%2d-%3.3s-%4ld", |
| range(1, timeptr->tm_mday, 31), |
| months_a[range(0, timeptr->tm_mon, 11)], |
| timeptr->tm_year + 1900L); |
| for (i = 3; i < 6; i++) |
| if (islower(tbuf[i])) |
| tbuf[i] = toupper(tbuf[i]); |
| break; |
| #endif |
| |
| default: |
| tbuf[0] = '%'; |
| tbuf[1] = *format; |
| tbuf[2] = '\0'; |
| break; |
| } |
| i = strlen(tbuf); |
| if (i) { |
| if (s + i < endp - 1) { |
| strcpy(s, tbuf); |
| s += i; |
| } else |
| return 0; |
| } |
| } |
| out: |
| if (s < endp && *format == '\0') { |
| *s = '\0'; |
| return (s - start); |
| } else |
| return 0; |
| } |
| |
| /* isleap --- is a year a leap year? */ |
| |
| static int |
| isleap(long year) |
| { |
| return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0); |
| } |
| |
| |
| /* iso8601wknum --- compute week number according to ISO 8601 */ |
| |
| static int |
| iso8601wknum(const struct tm *timeptr) |
| { |
| /* |
| * From 1003.2: |
| * If the week (Monday to Sunday) containing January 1 |
| * has four or more days in the new year, then it is week 1; |
| * otherwise it is the highest numbered week of the previous |
| * year (52 or 53), and the next week is week 1. |
| * |
| * ADR: This means if Jan 1 was Monday through Thursday, |
| * it was week 1, otherwise week 52 or 53. |
| * |
| * XPG4 erroneously included POSIX.2 rationale text in the |
| * main body of the standard. Thus it requires week 53. |
| */ |
| |
| int weeknum, jan1day, diff; |
| |
| /* get week number, Monday as first day of the week */ |
| weeknum = weeknumber(timeptr, 1); |
| |
| /* |
| * With thanks and tip of the hatlo to tml@tik.vtt.fi |
| * |
| * What day of the week does January 1 fall on? |
| * We know that |
| * (timeptr->tm_yday - jan1.tm_yday) MOD 7 == |
| * (timeptr->tm_wday - jan1.tm_wday) MOD 7 |
| * and that |
| * jan1.tm_yday == 0 |
| * and that |
| * timeptr->tm_wday MOD 7 == timeptr->tm_wday |
| * from which it follows that. . . |
| */ |
| jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7); |
| if (jan1day < 0) |
| jan1day += 7; |
| |
| /* |
| * If Jan 1 was a Monday through Thursday, it was in |
| * week 1. Otherwise it was last year's highest week, which is |
| * this year's week 0. |
| * |
| * What does that mean? |
| * If Jan 1 was Monday, the week number is exactly right, it can |
| * never be 0. |
| * If it was Tuesday through Thursday, the weeknumber is one |
| * less than it should be, so we add one. |
| * Otherwise, Friday, Saturday or Sunday, the week number is |
| * OK, but if it is 0, it needs to be 52 or 53. |
| */ |
| switch (jan1day) { |
| case 1: /* Monday */ |
| break; |
| case 2: /* Tuesday */ |
| case 3: /* Wednesday */ |
| case 4: /* Thursday */ |
| weeknum++; |
| break; |
| case 5: /* Friday */ |
| case 6: /* Saturday */ |
| case 0: /* Sunday */ |
| if (weeknum == 0) { |
| #ifdef USE_BROKEN_XPG4 |
| /* XPG4 (as of March 1994) says 53 unconditionally */ |
| weeknum = 53; |
| #else |
| /* get week number of last week of last year */ |
| struct tm dec31ly; /* 12/31 last year */ |
| dec31ly = *timeptr; |
| dec31ly.tm_year--; |
| dec31ly.tm_mon = 11; |
| dec31ly.tm_mday = 31; |
| dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1; |
| dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L); |
| weeknum = iso8601wknum(& dec31ly); |
| #endif |
| } |
| break; |
| } |
| |
| if (timeptr->tm_mon == 11) { |
| /* |
| * The last week of the year |
| * can be in week 1 of next year. |
| * Sigh. |
| * |
| * This can only happen if |
| * M T W |
| * 29 30 31 |
| * 30 31 |
| * 31 |
| */ |
| int wday, mday; |
| |
| wday = timeptr->tm_wday; |
| mday = timeptr->tm_mday; |
| if ( (wday == 1 && (mday >= 29 && mday <= 31)) |
| || (wday == 2 && (mday == 30 || mday == 31)) |
| || (wday == 3 && mday == 31)) |
| weeknum = 1; |
| } |
| |
| return weeknum; |
| } |
| |
| /* weeknumber --- figure how many weeks into the year */ |
| |
| /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */ |
| |
| static int |
| weeknumber(const struct tm *timeptr, int firstweekday) |
| { |
| int wday = timeptr->tm_wday; |
| int ret; |
| |
| if (firstweekday == 1) { |
| if (wday == 0) /* sunday */ |
| wday = 6; |
| else |
| wday--; |
| } |
| ret = ((timeptr->tm_yday + 7 - wday) / 7); |
| if (ret < 0) |
| ret = 0; |
| return ret; |
| } |
| |
| #if 0 |
| /* ADR --- I'm loathe to mess with ado's code ... */ |
| |
| Date: Wed, 24 Apr 91 20:54:08 MDT |
| From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK> |
| To: arnold@audiofax.com |
| |
| Hi Arnold, |
| in a process of fixing of strftime() in libraries on Atari ST I grabbed |
| some pieces of code from your own strftime. When doing that it came |
| to mind that your weeknumber() function compiles a little bit nicer |
| in the following form: |
| /* |
| * firstweekday is 0 if starting in Sunday, non-zero if in Monday |
| */ |
| { |
| return (timeptr->tm_yday - timeptr->tm_wday + |
| (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7; |
| } |
| How nicer it depends on a compiler, of course, but always a tiny bit. |
| |
| Cheers, |
| Michal |
| ntomczak@vm.ucs.ualberta.ca |
| #endif |
| |
| #ifdef TEST_STRFTIME |
| |
| /* |
| * NAME: |
| * tst |
| * |
| * SYNOPSIS: |
| * tst |
| * |
| * DESCRIPTION: |
| * "tst" is a test driver for the function "strftime". |
| * |
| * OPTIONS: |
| * None. |
| * |
| * AUTHOR: |
| * Karl Vogel |
| * Control Data Systems, Inc. |
| * vogelke@c-17igp.wpafb.af.mil |
| * |
| * BUGS: |
| * None noticed yet. |
| * |
| * COMPILE: |
| * cc -o tst -DTEST_STRFTIME strftime.c |
| */ |
| |
| /* ADR: I reformatted this to my liking, and deleted some unneeded code. */ |
| |
| #ifndef NULL |
| #include <stdio.h> |
| #endif |
| #include <sys/time.h> |
| #include <string.h> |
| |
| #define MAXTIME 132 |
| |
| /* |
| * Array of time formats. |
| */ |
| |
| static char *array[] = |
| { |
| "(%%A) full weekday name, var length (Sunday..Saturday) %A", |
| "(%%B) full month name, var length (January..December) %B", |
| "(%%C) Century %C", |
| "(%%D) date (%%m/%%d/%%y) %D", |
| "(%%E) Locale extensions (ignored) %E", |
| "(%%F) full month name, var length (January..December) %F", |
| "(%%H) hour (24-hour clock, 00..23) %H", |
| "(%%I) hour (12-hour clock, 01..12) %I", |
| "(%%M) minute (00..59) %M", |
| "(%%N) Emporer/Era Name %N", |
| "(%%O) Locale extensions (ignored) %O", |
| "(%%R) time, 24-hour (%%H:%%M) %R", |
| "(%%S) second (00..60) %S", |
| "(%%T) time, 24-hour (%%H:%%M:%%S) %T", |
| "(%%U) week of year, Sunday as first day of week (00..53) %U", |
| "(%%V) week of year according to ISO 8601 %V", |
| "(%%W) week of year, Monday as first day of week (00..53) %W", |
| "(%%X) appropriate locale time representation (%H:%M:%S) %X", |
| "(%%Y) year with century (1970...) %Y", |
| "(%%Z) timezone (EDT), or blank if timezone not determinable %Z", |
| "(%%a) locale's abbreviated weekday name (Sun..Sat) %a", |
| "(%%b) locale's abbreviated month name (Jan..Dec) %b", |
| "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c", |
| "(%%d) day of the month (01..31) %d", |
| "(%%e) day of the month, blank-padded ( 1..31) %e", |
| "(%%h) should be same as (%%b) %h", |
| "(%%j) day of the year (001..366) %j", |
| "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k", |
| "(%%l) hour, 12-hour clock, blank pad ( 0..12) %l", |
| "(%%m) month (01..12) %m", |
| "(%%o) Emporer/Era Year %o", |
| "(%%p) locale's AM or PM based on 12-hour clock %p", |
| "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r", |
| "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u", |
| "(%%v) VMS date (dd-bbb-YYYY) %v", |
| "(%%w) day of week (0..6, Sunday == 0) %w", |
| "(%%x) appropriate locale date representation %x", |
| "(%%y) last two digits of year (00..99) %y", |
| "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z", |
| (char *) NULL |
| }; |
| |
| /* main routine. */ |
| |
| int |
| main(argc, argv) |
| int argc; |
| char **argv; |
| { |
| long time(); |
| |
| char *next; |
| char string[MAXTIME]; |
| |
| int k; |
| int length; |
| |
| struct tm *tm; |
| |
| long clock; |
| |
| /* Call the function. */ |
| |
| clock = time((long *) 0); |
| tm = localtime(&clock); |
| |
| for (k = 0; next = array[k]; k++) { |
| length = strftime(string, MAXTIME, next, tm); |
| printf("%s\n", string); |
| } |
| |
| exit(0); |
| } |
| #endif /* TEST_STRFTIME */ |