123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/* Copyright (C) 2018 Curtis 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 Affero 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <stdarg.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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wchar_t *wcsnchr(const wchar_t *wcs, size_t len, wchar_t chr) {
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len = wcsnlen(wcs, len);
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for (size_t i = 0; i < len; ++i) {
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if (wcs[i] == chr) return (wchar_t *)&wcs[i];
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}
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return NULL;
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}
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wchar_t *wcsnrchr(const wchar_t *wcs, size_t len, wchar_t chr) {
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len = wcsnlen(wcs, len);
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for (size_t i = len - 1; i < len; --i) {
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if (wcs[i] == chr) return (wchar_t *)&wcs[i];
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}
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return NULL;
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}
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wchar_t *ambstowcs(const char *src) {
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size_t len = mbsrtowcs(NULL, &src, 0, NULL);
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if (len == (size_t)-1) return NULL;
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wchar_t *dst = malloc(sizeof(*dst) * (1 + len));
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if (!dst) return NULL;
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len = mbsrtowcs(dst, &src, 1 + len, NULL);
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if (len == (size_t)-1) {
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free(dst);
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return NULL;
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}
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return dst;
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}
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char *awcstombs(const wchar_t *src) {
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size_t len = wcsrtombs(NULL, &src, 0, NULL);
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if (len == (size_t)-1) return NULL;
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char *dst = malloc(sizeof(*dst) * (1 + len));
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if (!dst) return NULL;
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len = wcsrtombs(dst, &src, 1 + len, NULL);
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if (len == (size_t)-1) {
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free(dst);
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return NULL;
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}
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return dst;
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}
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char *awcsntombs(const wchar_t *src, size_t nwc) {
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size_t len = wcsnrtombs(NULL, &src, nwc, 0, NULL);
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if (len == (size_t)-1) return NULL;
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char *dst = malloc(sizeof(*dst) * (1 + len));
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if (!dst) return NULL;
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len = wcsnrtombs(dst, &src, nwc, 1 + len, NULL);
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if (len == (size_t)-1) {
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free(dst);
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return NULL;
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}
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return dst;
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}
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// From <https://en.cppreference.com/w/c/io/fwprintf#Notes>:
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//
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// While narrow strings provide snprintf, which makes it possible to determine
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// the required output buffer size, there is no equivalent for wide strings
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// (until C11's snwprintf_s), and in order to determine the buffer size, the
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// program may need to call swprintf, check the result value, and reallocate a
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// larger buffer, trying again until successful.
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//
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// snwprintf_s, unlike swprintf_s, will truncate the result to fit within the
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// array pointed to by buffer, even though truncation is treated as an error by
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// most bounds-checked functions.
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int vaswprintf(wchar_t **ret, const wchar_t *format, va_list ap) {
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*ret = NULL;
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for (size_t cap = 2 * wcslen(format);; cap *= 2) {
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wchar_t *buf = realloc(*ret, sizeof(*buf) * (1 + cap));
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if (!buf) goto fail;
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*ret = buf;
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va_list _ap;
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va_copy(_ap, ap);
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errno = EOVERFLOW; // vswprintf may not set errno.
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int len = vswprintf(*ret, 1 + cap, format, _ap);
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va_end(_ap);
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if (len >= 0) return len;
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if (errno != EOVERFLOW) goto fail;
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}
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fail:
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free(*ret);
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*ret = NULL;
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return -1;
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}
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