printing the same spot in the terminal

[Jacob Kjaergaard]

Hi!

Im looking for a (relatively) easy way to print at the same spot on the
terminal. Like i.e wget does when showing the progressbar and the
percentage of the download.

if been looking in the source code to wget, but it seems very
comprehensive.

printf normally "scrolls" this is what I want to control.

i've tried manipulating the stdout stream with lseek() and fseek() to
rewind, but this doesn't seem to work. the fileposition ftell() returns -1

anyone, any ideas?

/Jacob

 

[Martin Dickopp]

Im looking for a (relatively) easy way to print at the same spot on the
terminal. Like i.e wget does when showing the progressbar and the
percentage of the download.

If you're writing to a display device (like a terminal), you can use the
'\b' and '\r' control characters, which are intended to return to the
previous writing position and the beginning of the line, respectively.


#include <stdio.h>

int main (void)
{
int i;
for (i = 1; i <= 100; ++i)
{
/* do 1/100th of something */
printf ("\r%3d%% completed...", i);
fflush (stdout);
}
putchar ('\n');
return 0;
}


Martin

 

[Richard Bos]

Im looking for a (relatively) easy way to print at the same spot on the
terminal.

Then you need to study the ancient and now sadly almost lost art of
FAQ-reading.

In fact, you should've done so to begin with.

<http://www.eskimo.com/~scs/C-faq/q19.4.html>.

Richard