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/*
* safetitle sets the title of the terminal window to the given string,
* if and only if the terminal is recognized via its device attributes.
*
* If multiple terminals are attached to the same GNU screen session,
* the title is not set. It is theoretically possible to check every
* terminal too see if it is recognized and, if so, set the title --
* but that would make the code more complex.
*/
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <termios.h>
#include <unistd.h>
#define XTERM_DA (char[]){27,91,62,52,49,59,51,51,48,59,48,99,0}
#define SCREEN_DA (char[]){27,91,62,56,51,59,52,48,56,48,48,59,48,99,0}
int
da(int fd, char *buf, int real)
{
char c;
fd_set fds;
int i, r, responses;
struct timeval timeout;
FD_ZERO(&fds);
FD_SET(fd, &fds);
timeout.tv_sec = 0;
timeout.tv_usec = 0;
responses = 0;
i = 0;
if(real) write(fd, "\033P\033[>c\033\\", 8);
else write(fd, "\033[>c", 4);
read:
while(r = read(fd, &c, 1)){
if(r==-1){
warn("read");
return -1;
}
buf[i++] = c;
if(c==99) break;
}
buf[i] = '\0';
responses++;
/* ensure there is only one real terminal */
if(real && select(fd+1, &fds, NULL, NULL, &timeout)>0)
goto read;
if(responses>1)
buf[0] = '\0';
return i;
}
int
main(int argc, char *argv[])
{
char *ap, *buf;
int debug, r, screen, ttyfd;
struct termios term, restore;
r = 1;
/* parse arguments */
debug = 0;
if(argc==2)
ap = argv[1];
else if(argc==3){
ap = argv[2];
if(strcmp(argv[1], "-d")==0) debug = 1;
else goto usage;
}
else goto usage;
if((ttyfd = open("/dev/tty", O_RDWR))==-1)
err(1, "open");
if((buf = malloc(200*sizeof(char)))==NULL)
err(1, "malloc");
/* enter "raw" terminal mode */
tcgetattr(ttyfd, &restore);
tcgetattr(ttyfd, &term);
term.c_lflag &= ~(ICANON|ECHO);
tcsetattr(ttyfd, TCSANOW, &term);
/* get device attributes for real terminal */
if(da(ttyfd, buf, 0)==-1) goto end;
if(strcmp(buf, SCREEN_DA)==0)
screen = 1;
else
screen = 0;
if(da(ttyfd, buf, screen)==-1) goto end;
/* set title */
if(strcmp(buf, XTERM_DA)==0){
if(screen) dprintf(ttyfd, "\033P\033]2;%s\007\033\\", ap);
else dprintf(ttyfd, "\033]2;%s\007", ap);
}
else{
if(debug) fprintf(stderr, "wrong type of terminal\n");
r = 2;
goto end;
}
r = 0;
end:
tcsetattr(ttyfd, TCSANOW, &restore);
return r;
usage:
fprintf(stderr, "usage: %s [-d] title\n", argv[0]);
return 1;
}
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