480 lines
9.8 KiB
C
480 lines
9.8 KiB
C
/*
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* view.c -- a silly little viewer program
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*
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* written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
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* to test the scrolling code in ncurses.
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*
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* modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
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* the use of 'resizeterm()', and May 2000 to illustrate wide-character
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* handling.
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*
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* Takes a filename argument. It's a simple file-viewer with various
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* scroll-up and scroll-down commands.
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*
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* n -- scroll one line forward
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* p -- scroll one line back
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*
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* Either command accepts a numeric prefix interpreted as a repeat count.
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* Thus, typing `5n' should scroll forward 5 lines in the file.
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*
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* The way you can tell this is working OK is that, in the trace file,
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* there should be one scroll operation plus a small number of line
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* updates, as opposed to a whole-page update. This means the physical
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* scroll operation worked, and the refresh() code only had to do a
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* partial repaint.
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*
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* $Id: view.c,v 1.35 2001/01/14 01:39:24 tom Exp $
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*/
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#include <test.priv.h>
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#include <string.h>
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#include <ctype.h>
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#include <signal.h>
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#include <time.h>
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#if HAVE_TERMIOS_H
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# include <termios.h>
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#else
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# include <sgtty.h>
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#endif
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#if !defined(sun) || !HAVE_TERMIOS_H
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# if HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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# endif
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#endif
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/* This is needed to compile 'struct winsize' */
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#if NEED_PTEM_H
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#include <sys/stream.h>
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#include <sys/ptem.h>
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#endif
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static RETSIGTYPE finish(int sig) GCC_NORETURN;
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static void show_all(void);
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#if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZETERM
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#define CAN_RESIZE 1
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#else
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#define CAN_RESIZE 0
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#endif
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#if CAN_RESIZE
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static RETSIGTYPE adjust(int sig);
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static int interrupted;
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#endif
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static int waiting;
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static int shift;
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static int utf8_mode = FALSE;
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static char *fname;
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static chtype **lines;
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static chtype **lptr;
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static void
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usage(void)
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{
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static const char *msg[] =
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{
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"Usage: view [options] file"
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,""
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,"Options:"
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," -n NUM specify maximum number of lines (default 1000)"
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#if defined(KEY_RESIZE)
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," -r use experimental KEY_RESIZE rather than our own handler"
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#endif
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#ifdef TRACE
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," -t trace screen updates"
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," -T NUM specify trace mask"
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#endif
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," -u translate UTF-8 data"
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};
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size_t n;
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for (n = 0; n < SIZEOF(msg); n++)
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fprintf(stderr, "%s\n", msg[n]);
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exit(EXIT_FAILURE);
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}
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static int
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ch_len(chtype * src)
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{
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int result = 0;
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while (*src++)
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result++;
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return result;
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}
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/*
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* Allocate a string into an array of chtype's. If UTF-8 mode is
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* active, translate the string accordingly.
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*/
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static chtype *
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ch_dup(char *src)
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{
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unsigned len = strlen(src);
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chtype *dst = typeMalloc(chtype, len + 1);
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unsigned j, k;
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unsigned utf_count = 0;
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unsigned utf_char = 0;
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#define UCS_REPL 0xfffd
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for (j = k = 0; j < len; j++) {
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if (utf8_mode) {
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unsigned c = CharOf(src[j]);
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/* Combine UTF-8 into Unicode */
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if (c < 0x80) {
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/* We received an ASCII character */
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if (utf_count > 0)
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dst[k++] = UCS_REPL; /* prev. sequence incomplete */
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dst[k++] = c;
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utf_count = 0;
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} else if (c < 0xc0) {
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/* We received a continuation byte */
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if (utf_count < 1) {
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dst[k++] = UCS_REPL; /* ... unexpectedly */
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} else {
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if (!utf_char && !((c & 0x7f) >> (7 - utf_count))) {
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utf_char = UCS_REPL;
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}
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/* characters outside UCS-2 become UCS_REPL */
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if (utf_char > 0x03ff) {
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/* value would be >0xffff */
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utf_char = UCS_REPL;
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} else {
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utf_char <<= 6;
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utf_char |= (c & 0x3f);
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}
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utf_count--;
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if (utf_count == 0)
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dst[k++] = utf_char;
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}
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} else {
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/* We received a sequence start byte */
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if (utf_count > 0)
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dst[k++] = UCS_REPL; /* prev. sequence incomplete */
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if (c < 0xe0) {
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utf_count = 1;
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utf_char = (c & 0x1f);
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if (!(c & 0x1e))
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utf_char = UCS_REPL; /* overlong sequence */
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} else if (c < 0xf0) {
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utf_count = 2;
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utf_char = (c & 0x0f);
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} else if (c < 0xf8) {
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utf_count = 3;
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utf_char = (c & 0x07);
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} else if (c < 0xfc) {
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utf_count = 4;
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utf_char = (c & 0x03);
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} else if (c < 0xfe) {
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utf_count = 5;
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utf_char = (c & 0x01);
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} else {
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dst[k++] = UCS_REPL;
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utf_count = 0;
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}
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}
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} else {
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dst[k++] = src[j];
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}
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}
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dst[k] = 0;
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return dst;
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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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int MAXLINES = 1000;
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FILE *fp;
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char buf[BUFSIZ];
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int i;
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int my_delay = 0;
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chtype **olptr;
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int length = 0;
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int value = 0;
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bool done = FALSE;
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bool got_number = FALSE;
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#if CAN_RESIZE
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bool use_resize = TRUE;
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#endif
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while ((i = getopt(argc, argv, "n:rtT:u")) != EOF) {
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switch (i) {
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case 'n':
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if ((MAXLINES = atoi(optarg)) < 1)
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usage();
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break;
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#if CAN_RESIZE
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case 'r':
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use_resize = FALSE;
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break;
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#endif
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#ifdef TRACE
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case 'T':
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trace(atoi(optarg));
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break;
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case 't':
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trace(TRACE_CALLS);
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break;
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#endif
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case 'u':
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utf8_mode = TRUE;
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break;
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default:
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usage();
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}
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}
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if (optind + 1 != argc)
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usage();
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if ((lines = typeMalloc(chtype *, MAXLINES + 2)) == 0)
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usage();
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fname = argv[optind];
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if ((fp = fopen(fname, "r")) == 0) {
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perror(fname);
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return EXIT_FAILURE;
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}
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(void) signal(SIGINT, finish); /* arrange interrupts to terminate */
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#if CAN_RESIZE
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if (use_resize)
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(void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
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#endif
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/* slurp the file */
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for (lptr = &lines[0]; (lptr - lines) < MAXLINES; lptr++) {
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char temp[BUFSIZ], *s, *d;
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int col;
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if (fgets(buf, sizeof(buf), fp) == 0)
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break;
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/* convert tabs so that shift will work properly */
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for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
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if (*d == '\n') {
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*d = '\0';
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break;
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} else if (*d == '\t') {
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col = (col | 7) + 1;
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while ((d - temp) != col)
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*d++ = ' ';
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} else if (isprint(CharOf(*d)) || utf8_mode) {
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col++;
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d++;
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} else {
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sprintf(d, "\\%03o", CharOf(*s));
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d += strlen(d);
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col = (d - temp);
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}
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}
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*lptr = ch_dup(temp);
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}
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(void) fclose(fp);
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length = lptr - lines;
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(void) initscr(); /* initialize the curses library */
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keypad(stdscr, TRUE); /* enable keyboard mapping */
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(void) nonl(); /* tell curses not to do NL->CR/NL on output */
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(void) cbreak(); /* take input chars one at a time, no wait for \n */
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(void) noecho(); /* don't echo input */
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nodelay(stdscr, TRUE);
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idlok(stdscr, TRUE); /* allow use of insert/delete line */
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lptr = lines;
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while (!done) {
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int n, c;
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if (!got_number)
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show_all();
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n = 0;
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for (;;) {
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#if CAN_RESIZE
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if (interrupted)
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adjust(0);
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#endif
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waiting = TRUE;
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c = getch();
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waiting = FALSE;
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if ((c < 127) && isdigit(c)) {
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if (!got_number) {
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mvprintw(0, 0, "Count: ");
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clrtoeol();
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}
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addch(c);
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value = 10 * value + (c - '0');
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got_number = TRUE;
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} else
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break;
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}
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if (got_number && value) {
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n = value;
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} else {
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n = 1;
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}
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switch (c) {
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case KEY_DOWN:
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case 'n':
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olptr = lptr;
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for (i = 0; i < n; i++)
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if ((lptr - lines) < (length - LINES + 1))
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lptr++;
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else
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break;
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wscrl(stdscr, lptr - olptr);
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break;
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case KEY_UP:
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case 'p':
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olptr = lptr;
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for (i = 0; i < n; i++)
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if (lptr > lines)
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lptr--;
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else
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break;
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wscrl(stdscr, lptr - olptr);
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break;
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case 'h':
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case KEY_HOME:
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lptr = lines;
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break;
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case 'e':
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case KEY_END:
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if (length > LINES)
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lptr = lines + length - LINES + 1;
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else
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lptr = lines;
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break;
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case 'r':
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case KEY_RIGHT:
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shift++;
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break;
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case 'l':
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case KEY_LEFT:
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if (shift)
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shift--;
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else
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beep();
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break;
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case 'q':
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done = TRUE;
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break;
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#ifdef KEY_RESIZE
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case KEY_RESIZE: /* ignore this; ncurses will repaint */
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break;
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#endif
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case 's':
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if (got_number) {
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halfdelay(my_delay = n);
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} else {
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nodelay(stdscr, FALSE);
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my_delay = -1;
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}
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break;
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case ' ':
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nodelay(stdscr, TRUE);
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my_delay = 0;
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break;
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case ERR:
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if (!my_delay)
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napms(50);
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break;
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default:
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beep();
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break;
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}
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if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
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got_number = FALSE;
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value = 0;
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}
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}
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finish(0); /* we're done */
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}
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static RETSIGTYPE
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finish(int sig)
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{
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endwin();
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exit(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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#if CAN_RESIZE
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/*
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* This uses functions that are "unsafe", but it seems to work on SunOS and
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* Linux. The 'wrefresh(curscr)' is needed to force the refresh to start from
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* the top of the screen -- some xterms mangle the bitmap while resizing.
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*/
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static RETSIGTYPE
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adjust(int sig)
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{
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if (waiting || sig == 0) {
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struct winsize size;
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if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
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resizeterm(size.ws_row, size.ws_col);
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wrefresh(curscr); /* Linux needs this */
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show_all();
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}
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interrupted = FALSE;
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} else {
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interrupted = TRUE;
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}
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(void) signal(SIGWINCH, adjust); /* some systems need this */
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}
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#endif /* CAN_RESIZE */
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static void
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show_all(void)
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{
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int i;
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char temp[BUFSIZ];
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chtype *s;
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time_t this_time;
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#if CAN_RESIZE
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sprintf(temp, "(%3dx%3d) col %d ", LINES, COLS, shift);
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i = strlen(temp);
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sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
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#else
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sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
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#endif
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move(0, 0);
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printw("%.*s", COLS, temp);
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clrtoeol();
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this_time = time((time_t *) 0);
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strcpy(temp, ctime(&this_time));
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if ((i = strlen(temp)) != 0) {
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temp[--i] = 0;
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if (move(0, COLS - i - 2) != ERR)
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printw(" %s", temp);
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}
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scrollok(stdscr, FALSE); /* prevent screen from moving */
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for (i = 1; i < LINES; i++) {
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move(i, 0);
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printw("%3ld:", (long) (lptr + i - lines));
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clrtoeol();
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if ((s = lptr[i - 1]) != 0) {
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int len = ch_len(s);
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if (len > shift)
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addchstr(s + shift);
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}
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}
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setscrreg(1, LINES - 1);
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scrollok(stdscr, TRUE);
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refresh();
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}
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