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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:38:56 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:38:56 +0000 |
commit | 6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321 (patch) | |
tree | f63ce19d57fad3ac4a15bc26dbfbfa2b834111b5 /lib/sh/strftime.c | |
parent | Initial commit. (diff) | |
download | bash-upstream/5.2.15.tar.xz bash-upstream/5.2.15.zip |
Adding upstream version 5.2.15.upstream/5.2.15upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/sh/strftime.c')
-rw-r--r-- | lib/sh/strftime.c | 1012 |
1 files changed, 1012 insertions, 0 deletions
diff --git a/lib/sh/strftime.c b/lib/sh/strftime.c new file mode 100644 index 0000000..60bee79 --- /dev/null +++ b/lib/sh/strftime.c @@ -0,0 +1,1012 @@ +/* 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 + * Updated April, 2012 + * + * 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 <sys/types.h> + +#include <stdio.h> +#include <ctype.h> +#include <posixtime.h> +#include <errno.h> + +#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 */ +#define POSIX_2008 1 /* flag and fw for C, F, G, Y formats */ + +#undef strchr /* avoid AIX weirdness */ + +#if !defined (errno) +extern int errno; +#endif + +#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)) + +/* Whew! This stuff is a mess. */ +#if !defined(OS2) && !defined(MSDOS) && !defined(__CYGWIN__) && 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) || defined(__hpux) +extern long int timezone; +# else +# if !defined(__CYGWIN__) +extern int timezone, altzone; +# endif +# endif +#endif +#endif + +#undef min /* just in case */ + +/* 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); +} + +#ifdef POSIX_2008 +/* iso_8601_2000_year --- format a year per ISO 8601:2000 as in 1003.1 */ + +static void +iso_8601_2000_year(char *buf, int year, size_t fw) +{ + int extra; + char sign = '\0'; + + if (year >= -9999 && year <= 9999) { + sprintf(buf, "%0*d", (int) fw, year); + return; + } + + /* now things get weird */ + if (year > 9999) { + sign = '+'; + } else { + sign = '-'; + year = -year; + } + + extra = year / 10000; + year %= 10000; + sprintf(buf, "%c_%04d_%d", sign, extra, year); +} +#endif /* POSIX_2008 */ + +/* 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, oerrno; + 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 +#ifndef __CYGWIN__ + extern char *timezone(); + struct timeval tv; + struct timezone zone; +#endif /* __CYGWIN__ */ +#endif /* HAVE_TZNAME */ +#endif /* HAVE_TM_NAME */ +#endif /* HAVE_TM_ZONE */ +#ifdef POSIX_2008 + int pad; + size_t fw; + char flag; +#endif /* POSIX_2008 */ + + /* 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", }; + + oerrno = errno; + + 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; + } +#ifdef POSIX_2008 + pad = '\0'; + fw = 0; + flag = '\0'; + switch (*++format) { + case '+': + flag = '+'; + /* fall through */ + case '0': + pad = '0'; + format++; + break; + + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + break; + + default: + format--; + goto again; + } + for (; isdigit(*format); format++) { + fw = fw * 10 + (*format - '0'); + } + format--; +#endif /* POSIX_2008 */ + + 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': +#ifdef POSIX_2008 + if (pad != '\0' && fw > 0) { + size_t min_fw = (flag ? 3 : 2); + + fw = max(fw, min_fw); + sprintf(tbuf, flag + ? "%+0*ld" + : "%0*ld", (int) fw, + (timeptr->tm_year + 1900L) / 100); + } else +#endif /* POSIX_2008 */ + 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 */ + { +#ifdef POSIX_2008 + /* + * Field width for %F is for the whole thing. + * It must be at least 10. + */ + char m_d[10]; + strftime(m_d, sizeof m_d, "-%m-%d", timeptr); + size_t min_fw = 10; + + if (pad != '\0' && fw > 0) { + fw = max(fw, min_fw); + } else { + fw = min_fw; + } + + fw -= 6; /* -XX-XX at end are invariant */ + + iso_8601_2000_year(tbuf, timeptr->tm_year + 1900, fw); + strcat(tbuf, m_d); +#else + strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr); +#endif /* POSIX_2008 */ + } + 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') { +#ifdef POSIX_2008 + if (pad != '\0' && fw > 0) { + size_t min_fw = 4; + + fw = max(fw, min_fw); + sprintf(tbuf, flag + ? "%+0*ld" + : "%0*ld", (int) fw, + y); + } else +#endif /* POSIX_2008 */ + 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 */ +#ifdef POSIX_2008 + if (pad != '\0' && fw > 0) { + size_t min_fw = 4; + + fw = max(fw, min_fw); + sprintf(tbuf, flag + ? "%+0*ld" + : "%0*ld", (int) fw, + 1900L + timeptr->tm_year); + } else +#endif /* POSIX_2008 */ + 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. + */ +# if defined(__hpux) || defined (HPUX) || defined(__CYGWIN__) + off = -timezone / 60; +# else + /* ADR: 4 August 2001, fixed this per gazelle@interaccess.com */ + off = -(daylight ? altzone : timezone) / 60; +# endif +#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 abbreviation */ +#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'; + if (s == start) + errno = oerrno; + 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) Emperor/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) Emperor/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 */ |