diff options
Diffstat (limited to 'follow.c')
| -rw-r--r-- | follow.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/follow.c b/follow.c new file mode 100644 index 0000000..fe75558 --- /dev/null +++ b/follow.c @@ -0,0 +1,166 @@ +/* + * follow.c -- interactively print an ASCII file. + * + * This file is placed in the public domain. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <signal.h> +#include <time.h> +#include <unistd.h> +#include <sys/time.h> +#include <sys/types.h> + +#ifndef USE_SGTTY +# ifdef APOLLO +# include "/sys5.3/usr/include/sys/termio.h" +# else +/* + * including both termio.h and termios.h might be an overkill, and gives + * many warnings, but seems to be necessary at times. works anyway. + */ +# include <termios.h> +# include <termio.h> +# endif +/* #else USE_SGTTY */ +#endif + +/* + * SunOS 4 doesn't have function headers and has the defs needed from + * ioctl.h in termios.h. Does it compile with USE_SGTTY? + */ +#if (defined(sun) && defined(sparc) && ! defined(__SVR4)) +extern int printf(); +#else +# include <sys/ioctl.h> +#endif + +#ifdef BSD_LIKE +# include <sys/ioctl_compat.h> +# define O_RAW RAW +# define O_ECHO ECHO +# define O_CBREAK CBREAK +#endif + +#if defined(TCSETS) || defined(TCSETATTR) +# ifndef TCSETS /* cc for HP-UX SHOULD define this... */ +# define TCSETS TCSETATTR +# define TCGETS TCGETATTR +# endif +typedef struct termios termiostruct; +#else +# define TCSETS TCSETA +# define TCGETS TCGETA +typedef struct termio termiostruct; +#endif + +#ifdef VSUSP +# define O_SUSP VSUSP +#else +# ifdef SWTCH +# define O_SUSP SWTCH +# else +# define O_SUSP SUSP +# endif +#endif + +/*int ioctl();*/ + +#ifdef USE_SGTTY +static struct sgttyb ttybsave; +static struct tchars tcsave; +static struct ltchars ltcsave; +#else /* not USE_SGTTY */ +static termiostruct ttybsave; +#endif /* USE_SGTTY */ + +/* + * Terminal handling routines: + * These are one big mess of left-justified chicken scratches. + * It should be handled more cleanly...but unix portability is what it is. + */ + +/* + * Set the terminal to character-at-a-time-without-echo mode, and save the + * original state in ttybsave + */ +void set_terminal() +{ +#ifdef USE_SGTTY + struct sgttyb ttyb; + struct ltchars ltc; + ioctl(0, TIOCGETP, &ttybsave); + ioctl(0, TIOCGETC, &tcsave); + ioctl(0, TIOCGLTC, <csave); + ttyb = ttybsave; + ttyb.sg_flags = (ttyb.sg_flags|O_CBREAK) & ~O_ECHO; + ioctl(tty_read_fd, TIOCSETP, &ttyb); + ltc = ltcsave; + ltc.t_suspc = -1; + ioctl(0, TIOCSLTC, <c); +#else /* not USE_SGTTY */ + termiostruct ttyb; + ioctl(0, TCGETS, &ttyb); + ttybsave = ttyb; + ttyb.c_lflag &= ~(ECHO|ICANON); + ttyb.c_cc[VTIME] = 0; + ttyb.c_cc[VMIN] = 1; + /* disable the special handling of the suspend key (handle it ourselves) */ + ttyb.c_cc[O_SUSP] = 0; + ioctl(0, TCSETS, &ttyb); +#endif /* USE_SGTTY */ +} + +/* + * Reset the terminal to its original state + */ +void reset_terminal() +{ +#ifdef USE_SGTTY + ioctl(0, TIOCSETP, &ttybsave); + ioctl(0, TIOCSETC, &tcsave); + ioctl(0, TIOCSLTC, <csave); +#else /* not USE_SGTTY */ + ioctl(0, TCSETS, &ttybsave); +#endif /* USE_SGTTY */ +} + +int main(int argc, char *argv[]) { + FILE *f; + char c = 0, buf[512]; + int d; + + if (argc < 2) { + fprintf(stderr, "needed a file name\n"); + exit(0); + } + f = fopen(argv[1], "r"); + if (!f) { + fprintf(stderr, "unable to open %s\n", argv[1]); + exit(0); + } + + set_terminal(); + while(c!=0x1b) { + read(0, &c, 1); + if (c == 0x0a || c == 0x0d) { + if (fgets(buf, 512, f)) + fputs(buf, stdout); + else + break; + } + else { + if ((d = fgetc(f)) != EOF) + putchar(d); + else + break; + } + fflush(stdout); + } + reset_terminal(); + fputs("\033[0m\n", stdout); + return 0; +} + |