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313 lines
6.9 KiB
313 lines
6.9 KiB
/*
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* strftime.c
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*
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* Public-domain relatively quick-and-dirty implemenation of
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* ANSI library routine for System V Unix systems.
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*
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* If you want stuff in the System V ascftime routine, add the SYSV_EXT define.
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* For stuff needed to implement the P1003.2 date command, add POSIX2_DATE.
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*
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* The code for %c, %x, and %X is my best guess as to what's "appropriate".
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* This version ignores LOCALE information.
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* It also doesn't worry about multi-byte characters.
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* So there.
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*
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* Arnold Robbins
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* January, February, March, 1991
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*
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* Fixes from ado@elsie.nci.nih.gov
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* February 1991
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*/
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <time.h>
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#include <sys/types.h>
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static int weeknumber(const struct tm *timeptr, int firstweekday);
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static char *tzname[2] = {"",""};
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int daylight = 1;
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#define SYSV_EXT 1 /* stuff in System V ascftime routine */
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#define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */
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#define VMS_EXT 1 /* include %V for VMS date format */
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#if defined(POSIX2_DATE) && ! defined(SYSV_EXT)
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#define SYSV_EXT 1
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#endif
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/* strftime --- produce formatted time */
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size_t strftime(char *s, size_t maxsize, const char *format,
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const struct tm *timeptr)
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{
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char *endp = s + maxsize;
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char *start = s;
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char tbuf[100];
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int i;
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static short first = 1;
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/* various tables, useful in North America */
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static char *days_a[] = {
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"Sun", "Mon", "Tue", "Wed",
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"Thu", "Fri", "Sat",
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};
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static char *days_l[] = {
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"Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday",
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};
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static char *months_a[] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
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};
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static char *months_l[] = {
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"January", "February", "March", "April",
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"May", "June", "July", "August", "September",
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"October", "November", "December",
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};
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static char *ampm[] = { "AM", "PM", };
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if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0)
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return 0;
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if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize)
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return 0;
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if (first) {
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tzset();
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first = 0;
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}
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for (; *format && s < endp - 1; format++) {
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tbuf[0] = '\0';
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if (*format != '%') {
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*s++ = *format;
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continue;
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}
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again:
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switch (*++format) {
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case '\0':
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*s++ = '%';
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goto out;
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case '%':
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*s++ = '%';
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continue;
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case 'a': /* abbreviated weekday name */
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if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
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strcpy(tbuf, "?");
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else
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strcpy(tbuf, days_a[timeptr->tm_wday]);
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break;
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case 'A': /* full weekday name */
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if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
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strcpy(tbuf, "?");
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else
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strcpy(tbuf, days_l[timeptr->tm_wday]);
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break;
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#ifdef SYSV_EXT
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case 'h': /* abbreviated month name */
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#endif
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case 'b': /* abbreviated month name */
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if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
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strcpy(tbuf, "?");
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else
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strcpy(tbuf, months_a[timeptr->tm_mon]);
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break;
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case 'B': /* full month name */
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if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
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strcpy(tbuf, "?");
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else
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strcpy(tbuf, months_l[timeptr->tm_mon]);
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break;
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case 'c': /* appropriate date and time representation */
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sprintf(tbuf, "%s %s %2d %02d:%02d:%02d %d",
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days_a[timeptr->tm_wday],
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months_a[timeptr->tm_mon],
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timeptr->tm_mday,
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timeptr->tm_hour,
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timeptr->tm_min,
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timeptr->tm_sec,
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timeptr->tm_year + 1900);
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break;
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case 'd': /* day of the month, 01 - 31 */
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sprintf(tbuf, "%02d", timeptr->tm_mday);
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break;
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case 'H': /* hour, 24-hour clock, 00 - 23 */
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sprintf(tbuf, "%02d", timeptr->tm_hour);
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break;
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case 'I': /* hour, 12-hour clock, 01 - 12 */
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i = timeptr->tm_hour;
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if (i == 0)
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i = 12;
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else if (i > 12)
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i -= 12;
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sprintf(tbuf, "%02d", i);
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break;
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case 'j': /* day of the year, 001 - 366 */
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sprintf(tbuf, "%03d", timeptr->tm_yday + 1);
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break;
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case 'm': /* month, 01 - 12 */
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sprintf(tbuf, "%02d", timeptr->tm_mon + 1);
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break;
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case 'M': /* minute, 00 - 59 */
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sprintf(tbuf, "%02d", timeptr->tm_min);
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break;
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case 'p': /* am or pm based on 12-hour clock */
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if (timeptr->tm_hour < 12)
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strcpy(tbuf, ampm[0]);
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else
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strcpy(tbuf, ampm[1]);
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break;
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case 'S': /* second, 00 - 61 */
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sprintf(tbuf, "%02d", timeptr->tm_sec);
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break;
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case 'U': /* week of year, Sunday is first day of week */
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sprintf(tbuf, "%d", weeknumber(timeptr, 0));
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break;
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case 'w': /* weekday, Sunday == 0, 0 - 6 */
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sprintf(tbuf, "%d", timeptr->tm_wday);
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break;
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case 'W': /* week of year, Monday is first day of week */
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sprintf(tbuf, "%d", weeknumber(timeptr, 1));
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break;
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case 'x': /* appropriate date representation */
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sprintf(tbuf, "%s %s %2d %d",
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days_a[timeptr->tm_wday],
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months_a[timeptr->tm_mon],
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timeptr->tm_mday,
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timeptr->tm_year + 1900);
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break;
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case 'X': /* appropriate time representation */
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sprintf(tbuf, "%02d:%02d:%02d",
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timeptr->tm_hour,
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timeptr->tm_min,
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timeptr->tm_sec);
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break;
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case 'y': /* year without a century, 00 - 99 */
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i = timeptr->tm_year % 100;
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sprintf(tbuf, "%d", i);
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break;
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case 'Y': /* year with century */
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sprintf(tbuf, "%d", 1900 + timeptr->tm_year);
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break;
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case 'Z': /* time zone name or abbrevation */
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i = 0;
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if (daylight && timeptr->tm_isdst)
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i = 1;
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strcpy(tbuf, tzname[i]);
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break;
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#ifdef SYSV_EXT
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case 'n': /* same as \n */
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tbuf[0] = '\n';
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tbuf[1] = '\0';
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break;
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case 't': /* same as \t */
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tbuf[0] = '\t';
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tbuf[1] = '\0';
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break;
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case 'D': /* date as %m/%d/%y */
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strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr);
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break;
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case 'e': /* day of month, blank padded */
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sprintf(tbuf, "%2d", timeptr->tm_mday);
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break;
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case 'r': /* time as %I:%M:%S %p */
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strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);
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break;
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case 'R': /* time as %H:%M */
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strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);
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break;
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case 'T': /* time as %H:%M:%S */
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strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);
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break;
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#endif
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#ifdef VMS_EXT
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case 'V': /* date as dd-bbb-YYYY */
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sprintf(tbuf, "%2d-%3.3s-%4d",
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timeptr->tm_mday,
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months_a[timeptr->tm_mon],
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timeptr->tm_year + 1900);
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for (i = 3; i < 6; i++)
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if (islower(tbuf[i]))
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tbuf[i] = toupper(tbuf[i]);
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break;
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#endif
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#ifdef POSIX2_DATE
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case 'C':
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sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100);
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break;
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case 'E':
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case 'O':
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/* POSIX locale extensions, ignored for now */
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goto again;
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#endif
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default:
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tbuf[0] = '%';
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tbuf[1] = *format;
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tbuf[2] = '\0';
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break;
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}
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i = strlen(tbuf);
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if (i)
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if (s + i < endp - 1) {
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strcpy(s, tbuf);
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s += i;
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} else
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return 0;
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}
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out:
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if (s < endp && *format == '\0') {
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*s = '\0';
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return (s - start);
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} else
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return 0;
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}
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/* weeknumber --- figure how many weeks into the year */
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static int weeknumber(const struct tm *timeptr, int firstweekday)
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{
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if (firstweekday == 0)
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return (timeptr->tm_yday + 7 - timeptr->tm_wday) / 7;
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else
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return (timeptr->tm_yday + 7 -
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(timeptr->tm_wday ? (timeptr->tm_wday - 1) : 6)) / 7;
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}
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