forked from PsychoticNinja/irssi
02221eae37
remove illegal wcwidth.c include and compile wcwidth.c correct #include in wcwidth.c fallout from #480
136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/* utf8.c - Operations on UTF-8 strings.
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*
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* Copyright (C) 2002 Timo Sirainen
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*
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* Based on GLib code by
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*
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* Copyright (C) 1999 Tom Tromey
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* Copyright (C) 2000 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "utf8.h"
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#include "module.h"
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/* Provide is_utf8(): */
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#include "recode.h"
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int string_advance(char const **str, int policy)
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{
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if (policy == TREAT_STRING_AS_UTF8) {
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gunichar c;
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c = g_utf8_get_char(*str);
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*str = g_utf8_next_char(*str);
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return unichar_isprint(c) ? mk_wcwidth(c) : 1;
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} else {
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/* Assume TREAT_STRING_AS_BYTES: */
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*str += 1;
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return 1;
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}
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}
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int string_policy(const char *str)
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{
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if (is_utf8()) {
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if (str == NULL || g_utf8_validate(str, -1, NULL)) {
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/* No string provided or valid UTF-8 string: treat as UTF-8: */
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return TREAT_STRING_AS_UTF8;
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}
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}
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return TREAT_STRING_AS_BYTES;
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}
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int string_length(const char *str, int policy)
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{
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g_return_val_if_fail(str != NULL, 0);
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if (policy == -1) {
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policy = string_policy(str);
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}
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if (policy == TREAT_STRING_AS_UTF8) {
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return g_utf8_strlen(str, -1);
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}
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else {
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/* Assume TREAT_STRING_AS_BYTES: */
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return strlen(str);
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}
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}
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int string_width(const char *str, int policy)
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{
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int len;
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g_return_val_if_fail(str != NULL, 0);
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if (policy == -1) {
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policy = string_policy(str);
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}
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len = 0;
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while (*str != '\0') {
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len += string_advance(&str, policy);
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}
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return len;
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}
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int string_chars_for_width(const char *str, int policy, unsigned int n, unsigned int *bytes)
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{
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const char *c, *previous_c;
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int str_width, char_width, char_count;
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g_return_val_if_fail(str != NULL, -1);
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/* Handle the dummy case where n is 0: */
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if (n == 0) {
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if (bytes != NULL) {
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*bytes = 0;
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}
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return 0;
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}
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if (policy == -1) {
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policy = string_policy(str);
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}
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/* Iterate over characters until we reach n: */
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char_count = 0;
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str_width = 0;
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c = str;
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while (*c != '\0') {
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previous_c = c;
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char_width = string_advance(&c, policy);
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if (str_width + char_width > n) {
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/* We stepped beyond n, get one step back and stop there: */
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c = previous_c;
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break;
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}
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++ char_count;
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str_width += char_width;
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}
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/* At this point, we know that char_count characters reach str_width
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* columns, which is less than or equal to n. */
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/* Optionally provide the equivalent amount of bytes: */
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if (bytes != NULL) {
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*bytes = c - str;
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}
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return char_count;
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}
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