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