83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include "chat.h"
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enum { Cap = 512 };
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static wchar_t buf[Cap];
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static size_t len;
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static size_t pos;
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char *editHead(void) {
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static char mbs[MB_LEN_MAX * Cap];
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const wchar_t *ptr = buf;
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size_t n = wcsnrtombs(mbs, &ptr, pos, sizeof(mbs) - 1, NULL);
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assert(n != (size_t)-1);
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mbs[n] = '\0';
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return mbs;
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}
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char *editTail(void) {
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static char mbs[MB_LEN_MAX * Cap];
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const wchar_t *ptr = &buf[pos];
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size_t n = wcsnrtombs(mbs, &ptr, len - pos, sizeof(mbs) - 1, NULL);
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assert(n != (size_t)-1);
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mbs[n] = '\0';
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return mbs;
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}
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static void reserve(size_t index, size_t count) {
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if (len + count > Cap) return;
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memmove(&buf[index + count], &buf[index], sizeof(*buf) * (len - index));
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len += count;
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}
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static void delete(size_t index, size_t count) {
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if (index + count > len) return;
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memmove(
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&buf[index], &buf[index + count], sizeof(*buf) * (len - index - count)
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);
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len -= count;
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}
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void edit(size_t id, enum Edit op, wchar_t ch) {
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switch (op) {
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break; case EditHome: pos = 0;
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break; case EditEnd: pos = len;
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break; case EditLeft: if (pos) pos--;
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break; case EditRight: if (pos < len) pos++;
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break; case EditKill: len = pos = 0;
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break; case EditErase: if (pos) delete(--pos, 1);
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break; case EditInsert: {
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reserve(pos, 1);
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if (pos < Cap) buf[pos++] = ch;
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}
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break; case EditEnter: {
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pos = 0;
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command(id, editTail());
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len = 0;
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}
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}
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}
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