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#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <time.h>


void prtime() {
        time_t rawtime;
        struct tm * timeinfo;
        char *s;

        signal(SIGALRM, prtime);

        time ( &rawtime );
        timeinfo = localtime ( &rawtime );

        alarm (1) ; //printf("Time\n");
        printf ( "\033[s\033[6;45H %s \033[u", asctime (timeinfo) );
}

int main()
{
        signal(SIGALRM, prtime);
        alarm(1);
        printf("continue instructions\n");
        while (1) {
                pause();
                printf("continue instructions\n");
        }
}

I just try to write the clock at a specific position in terminal, but I want to save the cursor position before writing the clock, and then restore that position after writing the clock.

but the \033[s & \033[u doesn't work.

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closed as off topic by manatwork, Renan, rahmu, Gilles, jasonwryan Feb 22 '13 at 18:58

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1 Answer 1

up vote 2 down vote accepted

You are using commands CSI s and CSI u which have incompatible interpretations depending on the implementation.

The first one can be either "Save cursor position" or "Reset terminal emulator", the latter being a Solaris private interface.

You should use a library like ncurses to achieve portable screen handling but if you still want to hardcode the escape sequences, this might do what you expect:

printf ( "\0337\033[6;45H %s \0338", asctime (timeinfo) );
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