From 1c5aec60bb72ec932d68c71d91147e5516796196 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 29 Nov 1999 23:26:18 +0000
Subject: I finish devel. of Oracle compatible DateTime routines TO_CHAR(),
 TO_DATE() and PgSQL extension FROM_CHAR().

TO_CHAR() routine allow formating text output with a datetime values:

        SELECT TO_CHAR('now'::datetime, '"Now is: "HH24:MI:SS');
        to_char
        ----------------
        Now is: 21:04:10

FROM_CHAR() routine allow convert text to a datetime:

        SELECT FROM_CHAR('September 1999 10:20:30', 'FMMonth YYYY
HH:MI:SS');
        from_char
        -----------------------------
        Wed Sep 01 10:20:30 1999 CEST

TO_DATE() is equal with FROM_CHAR(), but output a Date only:

        SELECT TO_DATE('September 1999 10:20:30', 'FMMonth YYYY
HH:MI:SS');
        to_date
        ----------
        09-01-1999


In attache is compressed dir for the contrib. All is prepared, but I'am
not
sure if Makefile is good (probably yes).

Comments & suggestions ?


Thomas, thank you for your good advices.

                                                        Karel


------------------------------------------------------------------------------

Karel Zak <zakkr@zf.jcu.cz>
http://home.zf.jcu.cz/~zakkr/
---
 contrib/dateformat/test/rand_datetime.c | 71 +++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 contrib/dateformat/test/rand_datetime.c

(limited to 'contrib/dateformat/test/rand_datetime.c')

diff --git a/contrib/dateformat/test/rand_datetime.c b/contrib/dateformat/test/rand_datetime.c
new file mode 100644
index 00000000000..6a96776b9b7
--- /dev/null
+++ b/contrib/dateformat/test/rand_datetime.c
@@ -0,0 +1,71 @@
+
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+
+char	*month[]	= {
+	"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec",NULL        
+};
+
+char	*day[] = { "Sun","Mon","Tue","Wed","Thu","Fri","Sat", NULL };
+
+int num(FILE *f, int min, int max)
+{
+	int	x, y, one;
+	
+	one = x = fgetc(f);
+	
+	
+	if (x < min)
+		x = min;	
+	else if (x > max) {
+		while(x > max)
+			x /= 2;	 
+		return x;
+	}
+	
+	do {
+		y = fgetc(f);
+		if ((x+y) > max)
+			return x;
+		x += y;
+	} while(--one > 0);
+	
+	return x;	
+}
+
+int main(int argc, char **argv)
+{
+	FILE	*f; 
+	int	count;
+	
+	if (argc < 5) {
+		printf("\nUsage: %s <randfile> <num> <prefix> <postfix>\n", argv[0]);
+		printf("\n(C) Karel Zak - Zakkr 1999\n\n");
+		exit(1);
+	}
+	
+	if ((f = fopen(argv[1], "r")) == NULL) {
+		perror(argv[1]);
+		exit(1);
+	}
+
+	count = atoi(argv[2]);
+	
+	for(; count > 0; --count) {
+		fprintf(stdout, "%s%s %02d %s %02d:%02d:%02d %d%s\n",
+			argv[3],
+			day[ num(f, 0, 6) ],
+			num(f, 1, 28),
+			month[ num(f, 0, 11) ],	
+			num(f, 0, 23),
+			num(f, 0, 59),
+			num(f, 0, 59),
+			num(f, 0, 9999),
+			argv[4]
+		);	
+	}	
+	exit(0);
+}
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