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