added extra strftime.[ch] which supports ISO 8601 week numbers, together with instruc...

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2@383 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/NT-BUILD-TIPS.txt b/program/NT-BUILD-TIPS.txt
index 5fa5e7f5688c1eabda293552500a4f25a8b2f24b..d2f7213407b6ca4d30f9c11ea58ed880d515bb03 100644 (file)
--- a/program/NT-BUILD-TIPS.txt
+++ b/program/NT-BUILD-TIPS.txt
@@ -1,5 +1,12 @@
 Compiling RRDtool 1.1.x on Win32 with Microsoft Visual C++:
 ---------------------------------------------------------------
+4/10/05 Tobi
+The windows implementation of strftime does not seem to support
+the ISO 8601 week number (%V) I have therfore included the file
+strftime.[ch] which provides strftime_ ... if you compile rrdtool
+with -Dstrftime=_strftime and link strftime.o then you will
+get propper support for %V.
+
 7/29/04 Jake Brutlag
 
 As of Jan 2004, code for libraries utilized by rrdtool 

diff --git a/program/confignt/config.h b/program/confignt/config.h
index 7b9d68cda6f84c7dd498dc224756a17c28fd0120..62ebc5466b02b5b4f04e5e08dc3135d582e7b2dc 100644 (file)
--- a/program/confignt/config.h
+++ b/program/confignt/config.h
@@ -27,3 +27,4 @@
 #define RRDGRAPH_YLEGEND_ANGLE 90.0
 
 #define HAVE_STRING_H 1
+

diff --git a/program/src/strftime.c b/program/src/strftime.c
new file mode 100644 (file)
index 0000000..f349bbf
--- /dev/null
+++ b/program/src/strftime.c
@@ -0,0 +1,351 @@
+/**
+ *
+ * strftime.c
+ *
+ * implements the ansi c function strftime()
+ *
+ * written 6 september 1989 by jim nutt
+ * released into the public domain by jim nutt
+ *
+ * modified 21-Oct-89 by Rob Duff
+ *
+ * modified 08-Dec-04 by Tobi Oetiker (added %V)
+**/
+
+#include <stddef.h>     /* for size_t */
+#include <stdarg.h>     /* for va_arg */
+#include <time.h>       /* for struct tm */
+#include "strftime.h"
+
+static char *aday[] = {
+    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+};
+
+static char *day[] = {
+    "Sunday", "Monday", "Tuesday", "Wednesday",
+    "Thursday", "Friday", "Saturday"
+};
+
+static char *amonth[] = {
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static char *month[] = {
+    "January", "February", "March", "April", "May", "June",
+    "July", "August", "September", "October", "November", "December"
+};
+
+char *tzname_[2] = {"CST", "CDT"};        /* Add your own defaults here */
+
+static char buf[26];
+
+static void strfmt(char *str, const char *fmt, ...);
+
+/**
+ *
+ * size_t strftime_(char *str,
+ *                  size_t maxs,
+ *                  const char *fmt,
+ *                  const struct tm *t)
+ *
+ *      this functions acts much like a sprintf for time/date output.
+ *      given a pointer to an output buffer, a format string and a
+ *      time, it copies the time to the output buffer formatted in
+ *      accordance with the format string.  the parameters are used
+ *      as follows:
+ *
+ *          str is a pointer to the output buffer, there should
+ *          be at least maxs characters available at the address
+ *          pointed to by str.
+ *
+ *          maxs is the maximum number of characters to be copied
+ *          into the output buffer, included the '\0' terminator
+ *
+ *          fmt is the format string.  a percent sign (%) is used
+ *          to indicate that the following character is a special
+ *          format character.  the following are valid format
+ *          characters:
+ *
+ *              %A      full weekday name (Monday)
+ *              %a      abbreviated weekday name (Mon)
+ *              %B      full month name (January)
+ *              %b      abbreviated month name (Jan)
+ *              %c      standard date and time representation
+ *              %d      day-of-month (01-31)
+ *              %H      hour (24 hour clock) (00-23)
+ *              %I      hour (12 hour clock) (01-12)
+ *              %j      day-of-year (001-366)
+ *              %M      minute (00-59)
+ *              %m      month (01-12)
+ *              %p      local equivalent of AM or PM
+ *              %S      second (00-59)
+ *              %U      week-of-year, first day sunday (00-53)
+ *              %W      week-of-year, first day monday (00-53)
+ *              %V      ISO 8601 Week number 
+ *              %w      weekday (0-6, sunday is 0)
+ *              %X      standard time representation
+ *              %x      standard date representation
+ *              %Y      year with century
+ *              %y      year without century (00-99)
+ *              %Z      timezone name
+ *              %%      percent sign
+ *
+ *      the standard date string is equivalent to:
+ *
+ *          %a %b %d %Y
+ *
+ *      the standard time string is equivalent to:
+ *
+ *          %H:%M:%S
+ *
+ *      the standard date and time string is equivalent to:
+ *
+ *          %a %b %d %H:%M:%S %Y
+ *
+ *      strftime_() returns the number of characters placed in the
+ *      buffer, not including the terminating \0, or zero if more
+ *      than maxs characters were produced.
+ *
+**/
+
+size_t strftime_(char *s, size_t maxs, const char *f, const struct tm *t)
+{
+      int w,d;
+      char *p, *q, *r;
+
+      p = s;
+      q = s + maxs - 1;
+      while ((*f != '\0'))
+      {
+            if (*f++ == '%')
+            {
+                  r = buf;
+                  switch (*f++)
+                  {
+                  case '%' :
+                        r = "%";
+                        break;
+
+                  case 'a' :
+                        r = aday[t->tm_wday];
+                        break;
+
+                  case 'A' :
+                        r = day[t->tm_wday];
+                        break;
+
+                  case 'b' :
+                        r = amonth[t->tm_mon];
+                        break;
+
+                  case 'B' :
+                        r = month[t->tm_mon];
+                        break;
+
+                  case 'c' :
+                        strfmt(r, "%0 %0 %2 %2:%2:%2 %4",
+                              aday[t->tm_wday], amonth[t->tm_mon],
+                              t->tm_mday,t->tm_hour, t->tm_min,
+                              t->tm_sec, t->tm_year+1900);
+                        break;
+
+                  case 'd' :
+                        strfmt(r,"%2",t->tm_mday);
+                        break;
+
+                  case 'H' :
+                        strfmt(r,"%2",t->tm_hour);
+                        break;
+
+                  case 'I' :
+                        strfmt(r,"%2",(t->tm_hour%12)?t->tm_hour%12:12);
+                        break;
+
+                  case 'j' :
+                        strfmt(r,"%3",t->tm_yday+1);
+                        break;
+
+                  case 'm' :
+                        strfmt(r,"%2",t->tm_mon+1);
+                        break;
+
+                  case 'M' :
+                        strfmt(r,"%2",t->tm_min);
+                        break;
+
+                  case 'p' :
+                        r = (t->tm_hour>11)?"PM":"AM";
+                        break;
+
+                  case 'S' :
+                        strfmt(r,"%2",t->tm_sec);
+                        break;
+
+                  case 'U' :
+                        w = t->tm_yday/7;
+                        if (t->tm_yday%7 > t->tm_wday)
+                              w++;
+                        strfmt(r, "%2", w);
+                        break;
+
+                  case 'W' :
+                        w = t->tm_yday/7;
+                        if (t->tm_yday%7 > (t->tm_wday+6)%7)
+                              w++;
+                        strfmt(r, "%2", w);
+                        break;
+
+                  case 'V':
+
+                        /* ISO 8601 Week Of Year:
+                           If the week (Monday - Sunday) containing January 1 has four or more
+                           days in the new year, then it is week 1; otherwise it is week 53 of
+                           the previous year and the next week is week one. */
+
+                       w  =  (t->tm_yday + 7 - (t->tm_wday ? t->tm_wday - 1 : 6)) / 7;
+                        d  =  (t->tm_yday + 7 - (t->tm_wday ? t->tm_wday - 1 : 6)) % 7;
+
+                        if (d >= 4) { w++; } else if (w == 0) { w = 53; }
+                        strfmt(r, "%2", w);
+                        break;
+
+                  case 'w' :
+                        strfmt(r,"%1",t->tm_wday);
+                        break;
+
+                  case 'x' :
+                        strfmt(r, "%3s %3s %2 %4", aday[t->tm_wday],
+                              amonth[t->tm_mon], t->tm_mday, t->tm_year+1900);
+                        break;
+
+                  case 'X' :
+                        strfmt(r, "%2:%2:%2", t->tm_hour,
+                              t->tm_min, t->tm_sec);
+                        break;
+
+                  case 'y' :
+                        strfmt(r,"%2",t->tm_year%100);
+                        break;
+
+                  case 'Y' :
+                        strfmt(r,"%4",t->tm_year+1900);
+                        break;
+
+                  case 'Z' :
+                        r = (t->tm_isdst && tzname_[1][0]) ?
+                              tzname_[1] : tzname_[0];
+                        break;
+
+                  default:
+                        buf[0] = '%';     /* reconstruct the format */
+                        buf[1] = f[-1];
+                        buf[2] = '\0';
+                        if (buf[1] == 0)
+                              f--;        /* back up if at end of string */
+                  }
+                  while (*r)
+                  {
+                        if (p == q)
+                        {
+                              *q = '\0';
+                              return 0;
+                        }
+                        *p++ = *r++;
+                  }
+            }
+            else
+            {
+                  if (p == q)
+                  {
+                        *q = '\0';
+                        return 0;
+                  }
+                  *p++ = f[-1];
+            }
+      }
+      *p = '\0';
+      return p - s;
+}
+
+/*
+ *  stdarg.h
+ *
+typedef void *va_list;
+#define va_start(vp,v) (vp=((char*)&v)+sizeof(v))
+#define va_arg(vp,t) (*((t*)(vp))++)
+#define va_end(vp)
+ *
+ */
+
+static int pow[5] = { 1, 10, 100, 1000, 10000 };
+
+/**
+ * static void strfmt(char *str, char *fmt);
+ *
+ * simple sprintf for strftime
+ *
+ * each format descriptor is of the form %n
+ * where n goes from zero to four
+ *
+ * 0    -- string %s
+ * 1..4 -- int %?.?d
+ *
+**/
+
+static void strfmt(char *str, const char *fmt, ...)
+{
+      int ival, ilen;
+      char *sval;
+      va_list vp;
+
+      va_start(vp, fmt);
+      while (*fmt)
+      {
+            if (*fmt++ == '%')
+            {
+                  ilen = *fmt++ - '0';
+                  if (ilen == 0)                /* zero means string arg */
+                  {
+                        sval = va_arg(vp, char*);
+                        while (*sval)
+                              *str++ = *sval++;
+                  }
+                  else                          /* always leading zeros */
+                  {
+                        ival = va_arg(vp, int);
+                        while (ilen)
+                        {
+                              ival %= pow[ilen--];
+                              *str++ = (char)('0' + ival / pow[ilen]);
+                        }
+                  }
+            }
+            else  *str++ = fmt[-1];
+      }
+      *str = '\0';
+      va_end(vp);
+}
+
+#ifdef TEST
+
+#include <stdio.h>      /* for printf */
+#include <time.h>       /* for strftime */
+
+char test[80];
+
+int main(int argc, char *argv[])
+{
+      int len;
+      char *fmt;
+      time_t now;
+
+      time(&now);
+
+      fmt = (argc == 1) ? "%I:%M %p\n%c\n" : argv[1];
+      len = strftime_(test,sizeof test, fmt, localtime(&now));
+      printf("%d: %s\n", len, test);
+      return !len;
+}
+
+#endif /* TEST */

diff --git a/program/src/strftime.h b/program/src/strftime.h
new file mode 100644 (file)
index 0000000..44da0ea
--- /dev/null
+++ b/program/src/strftime.h
@@ -0,0 +1,18 @@
+/*
+**  STRFTIME.H - For older compilers which lack strftime()
+**
+**  Note: To avoid name collision with newer compilers, the function name
+**         strftime_() is used.
+*/
+
+#ifndef STRFTIME__H
+#define STRFTIME__H
+
+#include <stddef.h>     /* for size_t */
+#include <time.h>       /* for struct tm */
+
+size_t strftime_(char *s, size_t maxs, const char *f, const struct tm *t);
+
+extern char * tzname_[2];
+
+#endif /* STRFTIME__H */