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/*
* edline.c:
* Text input on a line of the screen.
*
*/
static const char rcsid[] = "$Id$";
#include <ctype.h>
#include <curses.h>
#include <string.h>
#include "iftop.h"
static int min(const int a, const int b) {
return a < b ? a : b;
}
/* edline:
* Display on line linenum of the screen the prompt and allow the user to input
* a line of text, whose initial value is as supplied. */
char *edline(int linenum, const char *prompt, const char *initial) {
int xstart, slen, off = 0, pos, i, c;
char *str;
xstart = strlen(prompt) + 2;
if (initial) {
str = xmalloc(slen = strlen(initial) * 2 + 1);
strcpy(str, initial);
} else {
str = xmalloc(slen = 256);
*str = 0;
}
pos = strlen(str);
do {
c = getch();
switch (c) {
case KEY_DL:
case 21: /* ^U */
*str = 0;
pos = 0;
break;
case KEY_LEFT:
--pos;
if (pos < 0) {
beep();
pos = 0;
}
break;
case KEY_RIGHT:
++pos;
if (pos > strlen(str)) {
beep();
pos = strlen(str);
}
break;
case KEY_HOME:
case 1: /* ^A */
pos = 0;
break;
case KEY_END:
case 5: /* ^E */
pos = strlen(str);
break;
case KEY_DC:
if (pos == strlen(str))
beep();
else
memmove(str + pos, str + pos + 1, strlen(str + pos + 1) + 1);
break;
case KEY_BACKSPACE:
if (pos == 0)
beep();
else {
memmove(str + pos - 1, str + pos, strlen(str + pos) + 1);
--pos;
}
break;
case 23: /* ^W */
for (i = pos; i > 0; --i)
if (!isspace((int)str[i])) break;
for (; i > 0; --i)
if (isspace((int)str[i])) break;
if (i != pos) {
memmove(str + i, str + pos, strlen(str + pos) + 1);
pos = i;
}
break;
case ERR:
break;
default:
if (isprint(c) && c != '\t') {
if (strlen(str) == slen - 1)
str = xrealloc(str, slen *= 2);
memmove(str + pos + 1, str + pos, strlen(str + pos) + 1);
str[pos++] = (char)c;
} else
beep();
break;
}
/* figure out the offset to use for the string */
off = 0;
if (pos > COLS - xstart - 1)
off = pos - (COLS - xstart - 1);
/* display the string */
mvaddstr(linenum, 0, prompt);
addstr("> ");
addnstr(str + off, min(strlen(str + off), COLS - xstart - 1));
clrtoeol();
move(linenum, xstart + pos - off);
refresh();
} while (c != KEY_ENTER && c != '\r' && c != '\x1b' && c != 7 /* ^G */);
if (c == KEY_ENTER || c == '\r')
/* Success */
return str;
else {
xfree(str);
return NULL;
}
}
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