* modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
* the use of 'resizeterm()'.
*
- * 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 1.26 1997/11/15 22:36:41 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)
#define CAN_RESIZE 1
#else
static int shift;
static char *fname;
-static char *lines[MAXLINES];
+static char **lines;
static char **lptr;
#if !HAVE_STRDUP
+#define strdup my_strdup
static char *strdup (char *s)
{
char *p;
}
#endif /* not HAVE_STRDUP */
+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
+ };
+ size_t n;
+ for (n = 0; n < SIZEOF(msg); n++)
+ fprintf(stderr, "%s\n", msg[n]);
+ exit (EXIT_FAILURE);
+}
+
int main(int argc, char *argv[])
{
+int MAXLINES = 1000;
FILE *fp;
char buf[BUFSIZ];
int i;
char **olptr;
int done = FALSE;
+int length = 0;
+#if CAN_RESIZE
+bool use_resize = TRUE;
+#endif
+ while ((i = getopt(argc, argv, "n:rtT:")) != 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;
+ default:
+ usage();
}
}
+ if (optind + 1 != argc)
+ usage();
+
+ if ((lines = (char **)calloc(MAXLINES+2, sizeof(*lines))) == 0)
+ usage();
+
+ fname = argv[optind];
+ if ((fp = fopen(fname, "r")) == 0) {
+ perror(fname);
+ return EXIT_FAILURE;
+ }
(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;
- 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++) {
col++;
d++;
} else {
- sprintf(d, "\\%03o", *s);
+ sprintf(d, "\\%03o", *s & 0xff);
d += strlen(d);
col = (d - temp);
}
}
- *lptr = strdup(temp);
+ *lptr = strdup(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 (;;) {
#if CAN_RESIZE
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;
- } else
+ 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)
if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
resizeterm(size.ws_row, size.ws_col);
- beep();
wrefresh(curscr); /* Linux needs this */
show_all();
}
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);
+ 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);
+ printw("%3d:", lptr+i-lines);
clrtoeol();
- }
+ }
setscrreg(1, LINES-1);
scrollok(stdscr, TRUE);
refresh();
projects / ncurses.git / blobdiff