diff options
Diffstat (limited to 'reference/C/CONTRIB/SNIP/clock.c')
| -rwxr-xr-x | reference/C/CONTRIB/SNIP/clock.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/SNIP/clock.c b/reference/C/CONTRIB/SNIP/clock.c new file mode 100755 index 0000000..4b0b52a --- /dev/null +++ b/reference/C/CONTRIB/SNIP/clock.c @@ -0,0 +1,200 @@ +/* CLOCK.H: prototypes/defines for the CLOCK.C file */
+/*
+ This file written in 1990 Jonathan R. Guthrie and placed in the
+ public domain
+*/
+
+int far startclock(int x, int y, int attr);
+void far stopclock(void);
+
+#define CLOCK_OK 0 /* Clock was installed properly */
+#define CLOCK_ERR_INST -1 /* Clock is already installed */
+#define CLOCK_ERR_OOS -2 /* Clock would be off the screen */
+
+
+/* CLOCK.C: An on-screen clock generator */
+/*
+ This file written in 1990 Jonathan R. Guthrie and placed in the
+ public domain
+*/
+
+#include <stdlib.h>
+#include <conio.h>
+#include <time.h>
+#include <dos.h>
+#include "clock.h"
+
+#define CLOCK 0x1c
+#define TRUE 1
+#define FALSE 0
+
+/* Now, the stuff needed for the for the on-screen clock */
+
+static void interrupt (*oldvector)(void);
+static void interrupt do_clock(void);
+static void setstr(char *, int, size_t);
+
+static char timestuff[22], hours, oddfives, ticks, ticklimit;
+
+static int clockx, clocky, clockattr, installed = FALSE;
+
+int far startclock(int x, int y, int attr)
+{
+ time_t temptime;
+ struct tm *struct_time;
+ int bigx;
+ struct text_info r;
+
+ /* The clock starting routine */
+
+ /* First, see if it's already installed */
+
+ if(installed)
+ return CLOCK_ERR_INST;
+ else installed = TRUE;
+
+ /* Now, set assorted important module constants */
+
+ clockx = x;
+ clocky = y;
+ clockattr = attr;
+
+ gettextinfo(&r);
+
+ if((clockx < 0) || (clockx > r.screenwidth - 10) ||
+ (clocky < 0) || (clocky > r.screenheight))
+ {
+ installed = FALSE;
+ return CLOCK_ERR_OOS;
+ }
+
+ /* Now, set the program's clock */
+
+ setstr(timestuff, clockattr, 22);
+
+ time(&temptime);
+ struct_time = localtime(&temptime);
+
+ oddfives = 0;
+ ticklimit = 17;
+ hours = (struct_time->tm_hour + 11) % 12 + 1;
+ timestuff[0] = (hours > 9) ? '1' : ' ';
+ timestuff[2] = '0' + hours % 10;
+ timestuff[4] = ':';
+ timestuff[6] = '0' + struct_time->tm_min / 10;
+ timestuff[8] = '0' + struct_time->tm_min % 10;
+ timestuff[10] = ':';
+ timestuff[12] = '0' + struct_time->tm_sec / 10;
+ timestuff[14] = '0' + struct_time->tm_sec % 10;
+ timestuff[16] = ' ';
+ timestuff[18] = (struct_time->tm_hour > 11) ? 'P' : 'A';
+ timestuff[20] = 'M';
+
+ /* Now, initialize the clock as displayed on the screen */
+
+ puttext(clockx, clocky, clockx+10, clocky, timestuff);
+
+ /* Finally, set the vector to point to the clock routine */
+
+ disable();
+ oldvector = getvect(CLOCK);
+ setvect(CLOCK, do_clock);
+ enable();
+ return CLOCK_OK;
+}
+
+static void interrupt do_clock(void)
+{
+ ++ticks;
+ if(ticks > ticklimit) /* Then, it's time to update the seconds */
+ {
+ ticks = 0;
+
+ /* First, handle the fractional Hz part */
+
+ ++oddfives;
+ if (5 == oddfives)
+ {
+ oddfives = 0;
+ ticklimit = 18;
+ }
+ else
+ {
+ ticklimit = 17;
+ }
+
+ /* Now, handle the seconds count */
+
+ ++timestuff[14];
+
+ if (timestuff[14] > '9')
+ {
+ timestuff[14] = '0';
+
+ /* Now, handle the tens of seconds count */
+
+ ++timestuff[12];
+ if (timestuff[12] > '5')
+ {
+ timestuff[12] = '0';
+
+ /* Now, handle the minutes count */
+
+ ++timestuff[8];
+ if (timestuff[8] > '9')
+ {
+ timestuff[8] = '0';
+
+ /* Now, handle the ten minutes count */
+
+ ++timestuff[6];
+ if (timestuff[6] > '5')
+ {
+ timestuff[6] = '0';
+
+ /* Now, handle the hours count */
+
+ ++hours;
+ if(12 == hours)
+ if ('P' == timestuff[18])
+ timestuff[18] = 'A';
+ else timestuff[18] = 'P';
+
+ if(hours > 12)
+ hours = 1;
+
+ timestuff[0] = (hours > 9) ? '1' : ' ';
+ timestuff[2] = '0' + hours % 10;
+ }
+ }
+ }
+ }
+
+ /* Now, update the display */
+
+ puttext(clockx, clocky, clockx+10, clocky, timestuff);
+ }
+}
+
+void far stopclock(void)
+{
+ if(installed)
+ {
+ disable();
+ setvect(CLOCK, oldvector);
+ enable();
+ installed = FALSE;
+ }
+}
+
+static void setstr(char *s, int ch, size_t n)
+{
+ size_t i;
+
+ for(i=0 ; i<n ; ++i)
+ {
+ s[i] = ch;
+ }
+
+ s[i] = '\0';
+}
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