GRASS Programmer's Manual 6.4.1(2011)
clicker.c
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00001 
00002 /*-
00003  * G_clicker()
00004  * 
00005  * Print a clock hand (one of '|', '/', '-', '\') to stderr.
00006  * Used in place of G_percent for unknown number of iterations
00007  * 
00008  */
00009 #include <stdio.h>
00010 
00011 static int G_clicker_prev = 0;
00012 
00013 int G_clicker(void)
00014 {
00015     int x;
00016     static char clicks[] = "|/-\\";
00017 
00018     if (G_clicker_prev == -1 || G_clicker_prev == 3)
00019         x = 0;
00020 
00021     else
00022         x = G_clicker_prev + 1;
00023 
00024     fprintf(stderr, "%1c\b", clicks[x]);
00025     fflush(stderr);
00026     G_clicker_prev = x;
00027 
00028     return 0;
00029 }
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