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Viewing changes to src/asktty.c

  • Committer: Bazaar Package Importer
  • Author(s): Ivo Timmermans
  • Date: 2002-01-17 23:08:39 UTC
  • Revision ID: james.westby@ubuntu.com-20020117230839-s22xl5hew1z4s3r5
Tags: upstream-2.5
Import upstream version 2.5

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src/asktty.c
 
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#include <stdio.h>
 
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#include <stdarg.h>
 
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#include <string.h>
 
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#include <ctype.h>
 
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#include <stdlib.h>
 
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#include <unistd.h>
 
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#include <signal.h>
 
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#include <termios.h>
 
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#include <sys/ioctl.h>
 
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#include <sys/fcntl.h>
 
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#include "config.h"
 
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#include "intl.h"
 
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#include "asktty.h"
 
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#define READBUF 4096
 
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static struct termios *tty = NULL;
 
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static void (*old_sighandler)(int) = NULL;
 
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void tty_restore(void) {
 
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        if(tty)
 
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                tcsetattr(STDIN_FILENO, TCSANOW, tty);
 
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}
 
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static void sighandler(int sig) {
 
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        tty_restore();
 
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        printf(_("Interrupted\n"));
 
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        if(old_sighandler)
 
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                old_sighandler(sig);
 
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        exit(128+sig);
 
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}
 
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void tty_init(void) {
 
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        static struct termios t;
 
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        void (*old_sig)(int);
 
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        if(!tcgetattr(STDIN_FILENO, &t)) {
 
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                tty = &t;
 
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                old_sig = signal(SIGINT, sighandler);
 
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                if(old_sig != SIG_ERR)
 
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                        old_sighandler = old_sig;
 
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        }
 
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}
 
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int tty_ask(char *choices, char *fmt, ...) {
 
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        va_list ap;
 
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        struct termios tmp;
 
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        int r;
 
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        unsigned char c[READBUF];
 
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        char *choice;
 
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        for(;;) {
 
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                va_start(ap, fmt);
 
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                vfprintf(stdout, fmt, ap);
 
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                va_end(ap);
 
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                fflush(stdout);
 
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                if(tty) {
 
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                        tmp = *tty;
 
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                        tmp.c_lflag &= ~ICANON;
 
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                        tmp.c_iflag &= ~ICRNL;
 
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                        tmp.c_lflag &= ~ECHO;
 
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                        tmp.c_cc[VTIME] = 0;
 
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                        tmp.c_cc[VMIN] = 1;
 
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                        tcsetattr(STDIN_FILENO, TCSANOW, &tmp);
 
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                }
 
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                r = read(STDIN_FILENO, c, READBUF);
 
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                tty_restore();
 
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                if(r < 0) {
 
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                        printf(_("Interrupted\n"));
 
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                        return -1;
 
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                }
 
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                if(!r || strchr(" \r", *c))
 
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                        *c = choices[0];
 
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                else
 
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                        *c = tolower(*c);
 
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                if(choice = strchr(choices, *c)) {
 
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                        printf("%c\n", toupper(*c));
 
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                        fflush(stdout);
 
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                        return choice - choices;
 
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                }
 
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                printf("\a\r\033[K");
 
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        }
 
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        return -1;
 
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}