* to test the scrolling code in ncurses.
*
* modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
- * the use of 'resizeterm()'.
+ * the use of 'resizeterm()', and May 2000 to illustrate wide-character
+ * handling.
*
- * Takes a filename argument. It's a simple file-viewer with various
+ * Takes a filename argument. It's a simple file-viewer with various
* scroll-up and scroll-down commands.
*
* n -- scroll one line forward
* scroll operation worked, and the refresh() code only had to do a
* partial repaint.
*
- * $Id: view.c,v 1.20 1997/04/26 18:16:38 tom Exp $
+ * $Id: view.c,v 1.29 2000/05/21 01:43:03 tom Exp $
*/
#include <test.priv.h>
#endif
/* This is needed to compile 'struct winsize' */
-#if SYSTEM_LOOKS_LIKE_SCO
+#if NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
-
-#define MAXLINES 256 /* most lines we can handle */
-static void finish(int sig) GCC_NORETURN;
+static RETSIGTYPE finish(int sig) GCC_NORETURN;
static void show_all(void);
-
-#if defined(SIGWINCH) && defined(TIOCGWINSZ) && defined(NCURSES_VERSION)
+
+#if defined(SIGWINCH) && defined(TIOCGWINSZ) && defined(HAVE_RESIZETERM)
#define CAN_RESIZE 1
#else
#define CAN_RESIZE 0
#if CAN_RESIZE
static RETSIGTYPE adjust(int sig);
-static int interrupted;
+static int interrupted;
#endif
-static int waiting;
-static int shift;
+static int waiting;
+static int shift;
+static int utf8_mode = FALSE;
+
+static char *fname;
+static chtype **lines;
+static chtype **lptr;
-static char *fname;
-static char *lines[MAXLINES];
-static char **lptr;
+static void
+usage(void)
+{
+ static const char *msg[] =
+ {
+ "Usage: view [options] file"
+ ,""
+ ,"Options:"
+ ," -n NUM specify maximum number of lines (default 1000)"
+#if defined(KEY_RESIZE)
+ ," -r use experimental KEY_RESIZE rather than our own handler"
+#endif
+#ifdef TRACE
+ ," -t trace screen updates"
+ ," -T NUM specify trace mask"
+#endif
+ ," -u translate UTF-8 data"
+ };
+ size_t n;
+ for (n = 0; n < SIZEOF(msg); n++)
+ fprintf(stderr, "%s\n", msg[n]);
+ exit(EXIT_FAILURE);
+}
-#if !HAVE_STRDUP
-static char *strdup (char *s)
+static int
+ch_len(chtype * src)
{
- char *p;
+ int result = 0;
+ while (*src++)
+ result++;
+ return result;
+}
- p = malloc(strlen(s)+1);
- if (p)
- strcpy(p,s);
- return(p);
+/*
+ * Allocate a string into an array of chtype's. If UTF-8 mode is
+ * active, translate the string accordingly.
+ */
+static chtype *
+ch_dup(char *src)
+{
+ unsigned len = strlen(src);
+ chtype *dst = typeMalloc(chtype, len + 1);
+ unsigned j, k;
+ unsigned utf_count = 0;
+ unsigned utf_char = 0;
+
+#define UCS_REPL 0xfffd
+
+ for (j = k = 0; j < len; j++) {
+ if (utf8_mode) {
+ unsigned c = src[j] & 0xff;
+ /* Combine UTF-8 into Unicode */
+ if (c < 0x80) {
+ /* We received an ASCII character */
+ if (utf_count > 0)
+ dst[k++] = UCS_REPL; /* prev. sequence incomplete */
+ dst[k++] = c;
+ utf_count = 0;
+ } else if (c < 0xc0) {
+ /* We received a continuation byte */
+ if (utf_count < 1) {
+ dst[k++] = UCS_REPL; /* ... unexpectedly */
+ } else {
+ if (!utf_char && !((c & 0x7f) >> (7 - utf_count))) {
+ utf_char = UCS_REPL;
+ }
+ /* characters outside UCS-2 become UCS_REPL */
+ if (utf_char > 0x03ff) {
+ /* value would be >0xffff */
+ utf_char = UCS_REPL;
+ } else {
+ utf_char <<= 6;
+ utf_char |= (c & 0x3f);
+ }
+ utf_count--;
+ if (utf_count == 0)
+ dst[k++] = utf_char;
+ }
+ } else {
+ /* We received a sequence start byte */
+ if (utf_count > 0)
+ dst[k++] = UCS_REPL; /* prev. sequence incomplete */
+ if (c < 0xe0) {
+ utf_count = 1;
+ utf_char = (c & 0x1f);
+ if (!(c & 0x1e))
+ utf_char = UCS_REPL; /* overlong sequence */
+ } else if (c < 0xf0) {
+ utf_count = 2;
+ utf_char = (c & 0x0f);
+ } else if (c < 0xf8) {
+ utf_count = 3;
+ utf_char = (c & 0x07);
+ } else if (c < 0xfc) {
+ utf_count = 4;
+ utf_char = (c & 0x03);
+ } else if (c < 0xfe) {
+ utf_count = 5;
+ utf_char = (c & 0x01);
+ } else {
+ dst[k++] = UCS_REPL;
+ utf_count = 0;
+ }
+ }
+ } else {
+ dst[k++] = src[j];
+ }
+ }
+ dst[k] = 0;
+ return dst;
}
-#endif /* not HAVE_STRDUP */
-int main(int argc, char *argv[])
+int
+main(int argc, char *argv[])
{
-FILE *fp;
-char buf[BUFSIZ];
-int i;
-char **olptr;
-int done = FALSE;
+ int MAXLINES = 1000;
+ FILE *fp;
+ char buf[BUFSIZ];
+ int i;
+ chtype **olptr;
+ int done = FALSE;
+ int length = 0;
+#if CAN_RESIZE
+ bool use_resize = TRUE;
+#endif
+ while ((i = getopt(argc, argv, "n:rtT:u")) != EOF) {
+ switch (i) {
+ case 'n':
+ if ((MAXLINES = atoi(optarg)) < 1)
+ usage();
+ break;
+#if CAN_RESIZE
+ case 'r':
+ use_resize = FALSE;
+ break;
+#endif
#ifdef TRACE
- trace(TRACE_UPDATE);
+ case 'T':
+ trace(atoi(optarg));
+ break;
+ case 't':
+ trace(TRACE_CALLS);
+ break;
#endif
-
- if (argc != 2) {
- fprintf(stderr, "usage: view file\n");
- return EXIT_FAILURE;
- } else {
- fname = argv[1];
- if ((fp = fopen(fname, "r")) == (FILE *)NULL) {
- perror(fname);
- return EXIT_FAILURE;
+ case 'u':
+ utf8_mode = TRUE;
+ break;
+ default:
+ usage();
}
}
+ if (optind + 1 != argc)
+ usage();
+
+ if ((lines = typeMalloc(chtype *, MAXLINES + 2)) == 0)
+ usage();
+
+ fname = argv[optind];
+ if ((fp = fopen(fname, "r")) == 0) {
+ perror(fname);
+ return EXIT_FAILURE;
+ }
- (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
+ (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
#if CAN_RESIZE
- (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
+ if (use_resize)
+ (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
#endif
- (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 */
- idlok(stdscr, TRUE); /* allow use of insert/delete line */
-
/* slurp the file */
- for (lptr = &lines[0]; fgets(buf, BUFSIZ, fp) != (char *)NULL; lptr++) {
+ for (lptr = &lines[0]; (lptr - lines) < MAXLINES; lptr++) {
char temp[BUFSIZ], *s, *d;
- int col;
+ int col;
- if (lptr - lines >= MAXLINES) {
- endwin();
- (void) fprintf(stderr, "%s: %s is too large\n", argv[0], argv[1]);
- return EXIT_FAILURE;
- }
+ 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++) {
break;
} else if (*d == '\t') {
col = (col | 7) + 1;
- while ((d-temp) != col)
+ while ((d - temp) != col)
*d++ = ' ';
- } else if (isprint(*d)) {
+ } else if (isprint(*d) || utf8_mode) {
col++;
d++;
} else {
- sprintf(d, "\\%03o", *s);
+ sprintf(d, "\\%03o", *s & 0xff);
d += strlen(d);
col = (d - temp);
}
}
- *lptr = strdup(temp);
+ *lptr = ch_dup(temp);
}
(void) fclose(fp);
+ length = lptr - 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 */
+ idlok(stdscr, TRUE); /* allow use of insert/delete line */
lptr = lines;
while (!done) {
- int n, c;
- bool explicit;
+ int n, c;
+ bool got_number;
show_all();
- explicit = FALSE;
+ got_number = FALSE;
n = 0;
- for (;;) {
+ for (;;) {
#if CAN_RESIZE
if (interrupted)
adjust(0);
waiting = TRUE;
c = getch();
waiting = FALSE;
- if (c < 127 && isdigit(c)) {
+ if ((c < 127) && isdigit(c)) {
+ if (!got_number) {
+ mvprintw(0, 0, "Count: ");
+ clrtoeol();
+ }
+ addch(c);
n = 10 * n + (c - '0');
- explicit = TRUE;
+ got_number = TRUE;
} else
break;
}
- if (!explicit && n == 0)
+ if (!got_number && n == 0)
n = 1;
- switch(c) {
- case KEY_DOWN:
+ switch (c) {
+ case KEY_DOWN:
case 'n':
olptr = lptr;
- for (i = 0; i < n; i++)
- if (lptr + LINES < lines + MAXLINES && lptr[LINES + 1])
+ for (i = 0; i < n; i++)
+ if ((lptr - lines) < (length - LINES + 1))
lptr++;
- else
+ else
break;
wscrl(stdscr, lptr - olptr);
- break;
+ break;
- case KEY_UP:
+ case KEY_UP:
case 'p':
olptr = lptr;
- for (i = 0; i < n; i++)
+ for (i = 0; i < n; i++)
if (lptr > lines)
lptr--;
- else
+ else
break;
wscrl(stdscr, lptr - olptr);
- break;
+ break;
case 'h':
case KEY_HOME:
lptr = lines;
break;
+ case 'e':
+ case KEY_END:
+ if (length > LINES)
+ lptr = lines + length - LINES + 1;
+ else
+ lptr = lines;
+ break;
+
case 'r':
case KEY_RIGHT:
shift++;
case 'l':
case KEY_LEFT:
if (shift)
- shift--;
+ shift--;
else
beep();
break;
done = TRUE;
break;
+#ifdef KEY_RESIZE
+ case KEY_RESIZE: /* ignore this; ncurses will repaint */
+ break;
+#endif
+#if CAN_RESIZE
+ case ERR:
+ break;
+#endif
default:
beep();
}
}
- finish(0); /* we're done */
+ finish(0); /* we're done */
}
-static RETSIGTYPE finish(int sig)
+static RETSIGTYPE
+finish(int sig)
{
endwin();
exit(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
* Linux. The 'wrefresh(curscr)' is needed to force the refresh to start from
* the top of the screen -- some xterms mangle the bitmap while resizing.
*/
-static RETSIGTYPE adjust(int sig)
+static RETSIGTYPE
+adjust(int sig)
{
- if (waiting || sig == 0) {
+ if (waiting || sig == 0) {
struct winsize size;
- if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
- resizeterm(size.ws_row, size.ws_col);
- beep();
- wrefresh(curscr); /* Linux needs this */
- show_all();
- }
- interrupted = FALSE;
- } else {
- interrupted = TRUE;
+ if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
+ resizeterm(size.ws_row, size.ws_col);
+ wrefresh(curscr); /* Linux needs this */
+ show_all();
}
- (void) signal(SIGWINCH, adjust); /* some systems need this */
+ interrupted = FALSE;
+ } else {
+ interrupted = TRUE;
+ }
+ (void) signal(SIGWINCH, adjust); /* some systems need this */
}
-#endif /* CAN_RESIZE */
+#endif /* CAN_RESIZE */
-static void show_all(void)
+static void
+show_all(void)
{
- int i;
- char temp[BUFSIZ];
- char *s;
+ int i;
+ char temp[BUFSIZ];
+ chtype *s;
#if CAN_RESIZE
- sprintf(temp, "(%3dx%3d) col %d ", LINES, COLS, shift);
- i = strlen(temp);
- sprintf(temp+i, "view %.*s", (int)(sizeof(temp)-7-i), fname);
+ sprintf(temp, "(%3dx%3d) col %d ", LINES, COLS, shift);
+ i = strlen(temp);
+ sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
#else
- sprintf(temp, "view %.*s", (int)sizeof(temp)-7, fname);
+ sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
#endif
- move(0,0);
- printw("%.*s", COLS, temp);
+ move(0, 0);
+ printw("%.*s", COLS, temp);
+ clrtoeol();
+
+ scrollok(stdscr, FALSE); /* prevent screen from moving */
+ for (i = 1; i < LINES; i++) {
+ move(i, 0);
+ printw("%3d:", (lptr + i - lines));
clrtoeol();
-
- scrollok(stdscr, FALSE); /* prevent screen from moving */
- for (i = 1; i < LINES; i++) {
- move(i, 0);
- if ((s = lptr[i-1]) != 0 && (int)strlen(s) > shift)
- printw("%3d:%.*s", lptr+i-lines, COLS-4, s + shift);
- else
- printw("%3d:", lptr+i-lines);
- clrtoeol();
- }
- setscrreg(1, LINES-1);
- scrollok(stdscr, TRUE);
- refresh();
+ if ((s = lptr[i - 1]) != 0) {
+ int len = ch_len(s);
+ if (len > shift)
+ addchstr(s + shift);
+ }
+ }
+ setscrreg(1, LINES - 1);
+ scrollok(stdscr, TRUE);
+ refresh();
}
-
-/* view.c ends here */
-
projects / ncurses.git / blobdiff