514 lines
10 KiB
C
514 lines
10 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 1.52 2002/04/27 22:37:39 tom Exp $
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*/
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#include <ctype.h>
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#include <time.h>
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#include <locale.h>
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#include <test.priv.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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#define my_pair 1
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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(const char *tag);
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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 bool waiting = FALSE;
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static int shift = 0;
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static bool try_color = FALSE;
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static char *fname;
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static NCURSES_CH_T **my_lines;
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static NCURSES_CH_T **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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," -c use color if terminal supports it"
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," -i ignore INT, QUIT, TERM signals"
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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 old-style sigwinch handler rather than KEY_RESIZE"
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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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};
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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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ExitProgram(EXIT_FAILURE);
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}
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static int
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ch_len(NCURSES_CH_T * src)
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{
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int result = 0;
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#if USE_WIDEC_SUPPORT
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#endif
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#if USE_WIDEC_SUPPORT
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while (getcchar(src++, NULL, NULL, NULL, NULL) > 0)
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result++;
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#else
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while (*src++)
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result++;
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#endif
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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 NCURSES_CH_T *
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ch_dup(char *src)
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{
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unsigned len = strlen(src);
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NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
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unsigned j, k;
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#if USE_WIDEC_SUPPORT
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wchar_t wstr[CCHARW_MAX + 1];
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wchar_t wch;
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int l = 0;
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mbstate_t state;
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size_t rc;
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int width;
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#endif
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#if USE_WIDEC_SUPPORT
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memset(&state, 0, sizeof(state));
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#endif
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for (j = k = 0; j < len; j++) {
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#if USE_WIDEC_SUPPORT
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rc = mbrtowc(&wch, src + j, len - j, &state);
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if (rc == (size_t) -1 || rc == (size_t) -2)
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break;
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j += rc - 1;
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if ((width = wcwidth(wch)) < 0)
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break;
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if ((width > 0 && l > 0) || l == CCHARW_MAX) {
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wstr[l] = L'\0';
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l = 0;
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if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
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break;
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++k;
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}
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if (width == 0 && l == 0)
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wstr[l++] = L' ';
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wstr[l++] = wch;
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#else
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dst[k++] = src[j];
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#endif
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}
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#if USE_WIDEC_SUPPORT
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if (l > 0) {
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wstr[l] = L'\0';
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if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
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++k;
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}
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setcchar(dst + k, L"", 0, 0, NULL);
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#else
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dst[k] = 0;
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#endif
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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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NCURSES_CH_T **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 nonposix_resize = FALSE;
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#endif
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const char *my_label = "Input";
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setlocale(LC_ALL, "");
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#ifndef NCURSES_VERSION
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/*
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* We know ncurses will catch SIGINT if we don't establish our own handler.
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* Other versions of curses may/may not catch it.
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*/
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(void) signal(SIGINT, finish); /* arrange interrupts to terminate */
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#endif
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while ((i = getopt(argc, argv, "cin:rtT:")) != EOF) {
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switch (i) {
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case 'c':
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try_color = TRUE;
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break;
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case 'i':
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGTERM, SIG_IGN);
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break;
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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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nonposix_resize = TRUE;
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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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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 ((my_lines = typeMalloc(NCURSES_CH_T *, 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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ExitProgram(EXIT_FAILURE);
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}
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#if CAN_RESIZE
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if (nonposix_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 = &my_lines[0]; (lptr - my_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
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#if USE_WIDEC_SUPPORT
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col++, d++;
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#else
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if (isprint(UChar(*d))) {
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col++;
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d++;
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} else {
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sprintf(d, "\\%03o", UChar(*s));
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d += strlen(d);
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col = (d - temp);
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}
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#endif
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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 - my_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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if (try_color) {
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if (has_colors()) {
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start_color();
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init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
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bkgd(COLOR_PAIR(my_pair));
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} else {
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try_color = FALSE;
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}
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}
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lptr = my_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(my_label);
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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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my_label = "interrupt";
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}
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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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if (c != ERR)
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my_label = keyname(c);
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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 - my_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 > my_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 = my_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 = my_lines + length - LINES + 1;
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else
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lptr = my_lines;
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break;
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case 'r':
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case KEY_RIGHT:
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shift += n;
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break;
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case 'l':
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case KEY_LEFT:
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shift -= n;
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if (shift < 0) {
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shift = 0;
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beep();
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}
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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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ExitProgram(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. Usually: the "unsafe" refers to the functions that POSIX lists
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* which may be called from a signal handler. Those do not include buffered
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* I/O, which is used for instance in wrefresh(). To be really portable, you
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* should use the KEY_RESIZE return (which relies on ncurses' sigwinch
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* handler).
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*
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* The 'wrefresh(curscr)' is needed to force the refresh to start from the top
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* 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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resize_term(size.ws_row, size.ws_col);
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wrefresh(curscr); /* Linux needs this */
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show_all(sig ? "SIGWINCH" : "interrupt");
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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(const char *tag)
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{
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int i;
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char temp[BUFSIZ];
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NCURSES_CH_T *s;
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time_t this_time;
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#if CAN_RESIZE
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sprintf(temp, "%s (%3dx%3d) col %d ", tag, 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 - my_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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#if USE_WIDEC_SUPPORT
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add_wchstr(s + shift);
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#else
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addchstr(s + shift);
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#endif
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if (try_color)
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wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
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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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