97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
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/*
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* Copyright Gerd Knorr <kraxel@suse.de>, 2003
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*
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* small tool to figure whenever a tty runs in utf8 mode or not.
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* writes a utf-8 multibyte sequence and then checks how far the
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* cursor has been moved.
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*
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* return codes:
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* 0 - don't know (stdin isn't a terminal, timeout, some error, ...)
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* 1 - not in utf8
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* 2 - utf-8
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <termios.h>
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struct termios saved_attributes;
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int saved_fl;
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void
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tty_raw()
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{
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struct termios tattr;
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fcntl(0,F_GETFL,&saved_fl);
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tcgetattr (0, &saved_attributes);
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fcntl(0,F_SETFL,O_NONBLOCK);
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memcpy(&tattr,&saved_attributes,sizeof(struct termios));
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tattr.c_lflag &= ~(ICANON|ECHO);
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tattr.c_cc[VMIN] = 1;
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tattr.c_cc[VTIME] = 0;
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tcsetattr (0, TCSAFLUSH, &tattr);
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}
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void
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tty_restore()
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{
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fcntl(0,F_SETFL,saved_fl);
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tcsetattr (0, TCSANOW, &saved_attributes);
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}
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int
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select_wait()
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{
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struct timeval tv;
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fd_set se;
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FD_ZERO(&se);
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FD_SET(0,&se);
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tv.tv_sec = 3;
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tv.tv_usec = 0;
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return select(1,&se,NULL,NULL,&tv);
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}
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int
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main(int argc, char **argv)
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{
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static char *teststr = "\r\xc3\xb6";
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static char *cleanup = "\r \r";
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static char *getpos = "\033[6n";
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char retstr[16];
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int pos,rc,row,col,verbose;
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verbose = 0;
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if (argc > 1 && 0 == strcmp(argv[1],"-v"))
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verbose = 1;
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if (!isatty(0) || !isatty(1)) {
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if (verbose)
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fprintf(stderr,"Not a tty.\n");
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exit(0);
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}
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tty_raw();
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write(1,teststr,strlen(teststr));
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write(1,getpos,strlen(getpos));
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for (pos = 0; pos < sizeof(retstr)-1;) {
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if (0 == select_wait())
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break;
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if (-1 == (rc = read(0,retstr+pos,sizeof(retstr)-1-pos))) {
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perror("read");
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exit(0);
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}
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pos += rc;
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if (retstr[pos-1] == 'R')
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break;
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}
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retstr[pos] = 0;
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write(1,cleanup,strlen(cleanup));
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tty_restore();
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rc = sscanf(retstr,"\033[%d;%dR",&row,&col);
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if (2 == rc && 2 == col) {
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if (verbose)
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fprintf(stderr,"Terminal is in UTF-8 mode.\n");
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exit(2);
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} else {
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if (verbose)
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fprintf(stderr,"Terminal is in byte mode.\n");
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exit(1);
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}
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}
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