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minix/lib/libcurses/EXAMPLES/view.c
Ben Gras 51ffecc181 import elf-only -lcurses 
. abandons mixer, gomoku, talk, talkd, top from base system
	. compile top with clang so no ack-compiled program
	  needs -lcurses any more
2011-07-25 11:08:17 +02:00

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C
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/*
* view.c -- a silly little viewer program
*
* written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
* to test the scrolling code in ncurses.
*
* modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
* the use of 'resizeterm()', and May 2000 to illustrate wide-character
* handling.
*
* Takes a filename argument. It's a simple file-viewer with various
* scroll-up and scroll-down commands.
*
* n -- scroll one line forward
* p -- scroll one line back
*
* Either command accepts a numeric prefix interpreted as a repeat count.
* Thus, typing `5n' should scroll forward 5 lines in the file.
*
* The way you can tell this is working OK is that, in the trace file,
* there should be one scroll operation plus a small number of line
* updates, as opposed to a whole-page update. This means the physical
* scroll operation worked, and the refresh() code only had to do a
* partial repaint.
*
* $Id: view.c,v 1.2 2007/05/28 15:01:58 blymn Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <signal.h>
#ifdef NCURSES
#define _XOPEN_SOURCE_EXTENDED
#include <ncurses.h>
#include <term.h>
#else
#include <curses.h>
#endif /* NCURSES */
#include <locale.h>
#include <assert.h>
#include <ctype.h>
#include <termios.h>
#include <util.h>
#include <unistd.h>
#ifdef HAVE_WCHAR
#include <wchar.h>
#endif /* HAVE_WCHAR */
#ifdef DEBUG
#include <syslog.h>
#endif /* DEBUG */
#define UChar(c) ((unsigned char)(c))
#define SIZEOF(table) (sizeof(table)/sizeof(table[0]))
#define typeMalloc(type,n) (type *) malloc((n) * sizeof(type))
#define my_pair 1
#undef CURSES_CH_T
#ifdef HAVE_WCHAR
#define CURSES_CH_T cchar_t
#else
#define CURSES_CH_T chtype
#endif /* HAVE_WCHAR */
static void finish(int sig);
static void show_all(const char *tag);
static int shift = 0;
static bool try_color = FALSE;
static char *fname;
static CURSES_CH_T **my_lines;
static CURSES_CH_T **lptr;
static unsigned num_lines;
static void usage(void)
{
static const char *msg[] = {
"Usage: view [options] file"
,""
,"Options:"
," -c use color if terminal supports it"
," -i ignore INT, QUIT, TERM signals"
," -n NUM specify maximum number of lines (default 1000)"
#if defined(KEY_RESIZE)
," -r use old-style sigwinch handler rather than KEY_RESIZE"
#endif
#ifdef TRACE
," -t trace screen updates"
," -T NUM specify trace mask"
#endif
};
size_t n;
for (n = 0; n < SIZEOF(msg); n++)
fprintf(stderr, "%s\n", msg[n]);
exit( 1 );
}
static int ch_len(CURSES_CH_T * src)
{
int result = 0;
#ifdef HAVE_WCHAR
while (getcchar(src++, NULL, NULL, NULL, NULL) > 0)
result++;
#else
while (*src++)
result++;
#endif
return result;
}
/*
* Allocate a string into an array of chtype's. If UTF-8 mode is
* active, translate the string accordingly.
*/
static CURSES_CH_T * ch_dup(char *src)
{
unsigned len = strlen(src);
CURSES_CH_T *dst = typeMalloc(CURSES_CH_T, len + 1);
unsigned j, k;
#ifdef HAVE_WCHAR
wchar_t wstr[CCHARW_MAX + 1];
wchar_t wch;
int l = 0;
mbstate_t state;
size_t rc;
int width;
#endif
#ifdef HAVE_WCHAR
mbrtowc( NULL, NULL, 1, &state );
#endif
for (j = k = 0; j < len; j++) {
#ifdef HAVE_WCHAR
rc = mbrtowc(&wch, src + j, len - j, &state);
#ifdef DEBUG
syslog( LOG_INFO, "[ch_dup]mbrtowc() returns %d", rc );
#endif /* DEBUG */
if (rc == (size_t) -1 || rc == (size_t) -2)
break;
j += rc - 1;
if ((width = wcwidth(wch)) < 0)
break;
if ((width > 0 && l > 0) || l == CCHARW_MAX) {
wstr[l] = L'\0';
l = 0;
if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
break;
++k;
}
if (width == 0 && l == 0)
wstr[l++] = L' ';
wstr[l++] = wch;
#ifdef DEBUG
syslog( LOG_INFO, "[ch_dup]wch=%x", wch );
#endif /* DEBUG */
#else
dst[k++] = src[j];
#endif
}
#ifdef HAVE_WCHAR
if (l > 0) {
wstr[l] = L'\0';
if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
++k;
}
setcchar(dst + k, L"", 0, 0, NULL);
#else
dst[k] = 0;
#endif
return dst;
}
int main(int argc, char *argv[])
{
int MAXLINES = 1000;
FILE *fp;
char buf[BUFSIZ];
int i;
int my_delay = 0;
CURSES_CH_T **olptr;
int length = 0;
int value = 0;
bool done = FALSE;
bool got_number = FALSE;
const char *my_label = "Input";
#ifdef HAVE_WCHAR
cchar_t icc;
#endif /* HAVE_WCHAR */
setlocale(LC_ALL, "");
(void) signal(SIGINT, finish); /* arrange interrupts to terminate */
while ((i = getopt(argc, argv, "cin:rtT:")) != EOF) {
switch (i) {
case 'c':
try_color = TRUE;
break;
case 'i':
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
break;
case 'n':
if ((MAXLINES = atoi(optarg)) < 1)
usage();
break;
#ifdef TRACE
case 'T':
trace(atoi(optarg));
break;
case 't':
trace(TRACE_CALLS);
break;
#endif
default:
usage();
}
}
if (optind + 1 != argc)
usage();
if ((my_lines = typeMalloc(CURSES_CH_T *, MAXLINES + 2)) == 0)
usage();
fname = argv[optind];
if ((fp = fopen(fname, "r")) == 0) {
perror(fname);
exit( 1 );
}
/* slurp the file */
num_lines = 0;
for (lptr = &my_lines[0]; (lptr - my_lines) < MAXLINES; lptr++) {
char temp[BUFSIZ], *s, *d;
int col;
if (fgets(buf, sizeof(buf), fp) == 0)
break;
/* convert tabs so that shift will work properly */
for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
if (*d == '\n') {
*d = '\0';
break;
} else if (*d == '\t') {
col = (col | 7) + 1;
while ((d - temp) != col)
*d++ = ' ';
} else
#ifdef HAVE_WCHAR
col++, d++;
#else
if (isprint(UChar(*d))) {
col++;
d++;
} else {
sprintf(d, "\\%03o", UChar(*s));
d += strlen(d);
col = (d - temp);
}
#endif
}
*lptr = ch_dup(temp);
num_lines++;
}
(void) fclose(fp);
length = lptr - my_lines;
(void) initscr(); /* initialize the curses library */
keypad(stdscr, TRUE); /* enable keyboard mapping */
(void) nonl(); /* tell curses not to do NL->CR/NL on output */
(void) cbreak(); /* take input chars one at a time, no wait for \n */
(void) noecho(); /* don't echo input */
nodelay(stdscr, TRUE);
idlok(stdscr, TRUE); /* allow use of insert/delete line */
if (try_color) {
if (has_colors()) {
start_color();
init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
bkgd(COLOR_PAIR(my_pair));
} else {
try_color = FALSE;
}
}
lptr = my_lines;
while (!done) {
int n;
#ifdef HAVE_WCHAR
wint_t c = 0;
int ret;
#else
int c = 0;
#endif /* HAVE_WCHAR */
if (!got_number)
show_all(my_label);
n = 0;
for (;;) {
c = 0;
#ifdef HAVE_WCHAR
ret = get_wch( &c );
if ( ret == ERR ) {
if (!my_delay)
napms(50);
continue;
}
#ifdef DEBUG
else if ( ret == KEY_CODE_YES )
syslog( LOG_INFO, "[main]Func key(%x)", c );
else
syslog( LOG_INFO, "[main]c=%x", c );
#endif /* DEBUG */
#else
c = getch();
#ifdef DEBUG
syslog( LOG_INFO, "[main]c='%c'", c );
#endif /* DEBUG */
#endif /* HAVE_WCHAR */
if ((c < 127) && isdigit(c)) {
if (!got_number) {
mvprintw(0, 0, "Count: ");
clrtoeol();
}
addch(c);
value = 10 * value + (c - '0');
got_number = TRUE;
} else
break;
}
if (got_number && value) {
n = value;
} else {
n = 1;
}
#ifdef HAVE_WCHAR
if (ret != ERR)
my_label = key_name( c );
else
if (!my_delay)
napms(50);
#else
if (c != ERR)
my_label = keyname(c);
#endif /* HAVE_WCHAR */
switch (c) {
case KEY_DOWN:
#ifdef HAVE_WCHAR
case L'n':
#else
case 'n':
#endif /* HAVE_WCHAR */
olptr = lptr;
for (i = 0; i < n; i++)
if ((lptr - my_lines) < (length - LINES + 1))
lptr++;
else
break;
wscrl(stdscr, lptr - olptr);
break;
case KEY_UP:
#ifdef HAVE_WCHAR
case L'p':
#else
case 'p':
#endif /* HAVE_WCHAR */
olptr = lptr;
for (i = 0; i < n; i++)
if (lptr > my_lines)
lptr--;
else
break;
wscrl(stdscr, lptr - olptr);
break;
#ifdef HAVE_WCHAR
case L'h':
#else
case 'h':
#endif /* HAVE_WCHAR */
case KEY_HOME:
lptr = my_lines;
break;
#ifdef HAVE_WCHAR
case L'e':
#else
case 'e':
#endif /* HAVE_WCHAR */
case KEY_END:
if (length > LINES)
lptr = my_lines + length - LINES + 1;
else
lptr = my_lines;
break;
#ifdef HAVE_WCHAR
case L'r':
#else
case 'r':
#endif /* HAVE_WCHAR */
case KEY_RIGHT:
shift += n;
break;
#ifdef HAVE_WCHAR
case L'l':
#else
case 'l':
#endif /* HAVE_WCHAR */
case KEY_LEFT:
shift -= n;
if (shift < 0) {
shift = 0;
beep();
}
break;
#ifdef HAVE_WCHAR
case L'q':
#else
case 'q':
#endif /* HAVE_WCHAR */
done = TRUE;
break;
#ifdef KEY_RESIZE
case KEY_RESIZE:
//refresh();
break;
#endif
#ifdef HAVE_WCHAR
case L's':
#else
case 's':
#endif /* HAVE_WCHAR */
if (got_number) {
halfdelay(my_delay = n);
} else {
nodelay(stdscr, FALSE);
my_delay = -1;
}
break;
#ifdef HAVE_WCHAR
case L' ':
#else
case ' ':
#endif /* HAVE_WCHAR */
nodelay(stdscr, TRUE);
my_delay = 0;
break;
#ifndef HAVE_WCHAR
case ERR:
if (!my_delay)
napms(50);
break;
#endif /* HAVE_WCHAR */
default:
beep();
break;
}
if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
got_number = FALSE;
value = 0;
}
}
finish(0); /* we're done */
}
static void finish(int sig)
{
endwin();
exit(sig != 0 ? 1 : 0 );
}
static void show_all(const char *tag)
{
int i;
char temp[BUFSIZ];
CURSES_CH_T *s;
time_t this_time;
sprintf(temp, "%s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
i = strlen(temp);
sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
move(0, 0);
printw("%.*s", COLS, temp);
clrtoeol();
this_time = time((time_t *) 0);
strcpy(temp, ctime(&this_time));
if ((i = strlen(temp)) != 0) {
temp[--i] = 0;
if (move(0, COLS - i - 2) != ERR)
printw(" %s", temp);
}
scrollok(stdscr, FALSE); /* prevent screen from moving */
for (i = 1; i < LINES; i++) {
move(i, 0);
printw("%3ld:", (long) (lptr + i - my_lines));
clrtoeol();
if ((s = lptr[i - 1]) != 0) {
if (i < num_lines) {
int len = ch_len(s);
if (len > shift) {
#ifdef HAVE_WCHAR
add_wchstr(s + shift);
#else
addchstr(s + shift);
#endif
}
}
}
}
setscrreg(1, LINES - 1);
scrollok(stdscr, TRUE);
refresh();
}
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