tmux/utf8.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <vis.h>
#include <wchar.h>
#include "tmux.h"
static int utf8_width(wchar_t);
/* Set a single character. */
void
utf8_set(struct utf8_data *ud, u_char ch)
{
static const struct utf8_data empty = { { 0 }, 1, 1, 1 };
memcpy(ud, &empty, sizeof *ud);
*ud->data = ch;
}
/* Copy UTF-8 character. */
void
utf8_copy(struct utf8_data *to, const struct utf8_data *from)
{
u_int i;
memcpy(to, from, sizeof *to);
for (i = to->size; i < sizeof to->data; i++)
to->data[i] = '\0';
}
/*
* Open UTF-8 sequence.
*
* 11000010-11011111 C2-DF start of 2-byte sequence
* 11100000-11101111 E0-EF start of 3-byte sequence
* 11110000-11110100 F0-F4 start of 4-byte sequence
*/
enum utf8_state
utf8_open(struct utf8_data *ud, u_char ch)
{
memset(ud, 0, sizeof *ud);
if (ch >= 0xc2 && ch <= 0xdf)
ud->size = 2;
else if (ch >= 0xe0 && ch <= 0xef)
ud->size = 3;
else if (ch >= 0xf0 && ch <= 0xf4)
ud->size = 4;
else
return (UTF8_ERROR);
utf8_append(ud, ch);
return (UTF8_MORE);
}
/* Append character to UTF-8, closing if finished. */
enum utf8_state
utf8_append(struct utf8_data *ud, u_char ch)
{
wchar_t wc;
int width;
if (ud->have >= ud->size)
fatalx("UTF-8 character overflow");
if (ud->size > sizeof ud->data)
fatalx("UTF-8 character size too large");
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if (ud->have != 0 && (ch & 0xc0) != 0x80)
ud->width = 0xff;
ud->data[ud->have++] = ch;
if (ud->have != ud->size)
return (UTF8_MORE);
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if (ud->width == 0xff)
return (UTF8_ERROR);
if (utf8_combine(ud, &wc) != UTF8_DONE)
return (UTF8_ERROR);
if ((width = utf8_width(wc)) < 0)
return (UTF8_ERROR);
ud->width = width;
return (UTF8_DONE);
}
/* Get width of Unicode character. */
static int
utf8_width(wchar_t wc)
{
int width;
width = wcwidth(wc);
if (width < 0 || width > 0xff) {
log_debug("Unicode %04x, wcwidth() %d", wc, width);
return (-1);
}
return (width);
}
/* Combine UTF-8 into Unicode. */
enum utf8_state
utf8_combine(const struct utf8_data *ud, wchar_t *wc)
{
switch (mbtowc(wc, ud->data, ud->size)) {
case -1:
log_debug("UTF-8 %.*s, mbtowc() %d", (int)ud->size, ud->data,
errno);
mbtowc(NULL, NULL, MB_CUR_MAX);
return (UTF8_ERROR);
case 0:
return (UTF8_ERROR);
default:
return (UTF8_DONE);
}
}
/* Split Unicode into UTF-8. */
enum utf8_state
utf8_split(wchar_t wc, struct utf8_data *ud)
{
char s[MB_LEN_MAX];
int slen;
slen = wctomb(s, wc);
if (slen <= 0 || slen > (int)sizeof ud->data)
return (UTF8_ERROR);
memcpy(ud->data, s, slen);
ud->size = slen;
ud->width = utf8_width(wc);
return (UTF8_DONE);
}
/*
* Encode len characters from src into dst, which is guaranteed to have four
* bytes available for each character from src (for \abc or UTF-8) plus space
* for \0.
*/
int
utf8_strvis(char *dst, const char *src, size_t len, int flag)
{
struct utf8_data ud;
const char *start, *end;
enum utf8_state more;
size_t i;
start = dst;
end = src + len;
while (src < end) {
if ((more = utf8_open(&ud, *src)) == UTF8_MORE) {
while (++src < end && more == UTF8_MORE)
more = utf8_append(&ud, *src);
if (more == UTF8_DONE) {
/* UTF-8 character finished. */
for (i = 0; i < ud.size; i++)
*dst++ = ud.data[i];
continue;
}
/* Not a complete, valid UTF-8 character. */
src -= ud.have;
}
if (src < end - 1)
dst = vis(dst, src[0], flag, src[1]);
else if (src < end)
dst = vis(dst, src[0], flag, '\0');
src++;
}
*dst = '\0';
return (dst - start);
}
/* Same as utf8_strvis but allocate the buffer. */
int
utf8_stravis(char **dst, const char *src, int flag)
{
char *buf;
int len;
buf = xreallocarray(NULL, 4, strlen(src) + 1);
len = utf8_strvis(buf, src, strlen(src), flag);
*dst = xrealloc(buf, len + 1);
return (len);
}
/*
* Sanitize a string, changing any UTF-8 characters to '_'. Caller should free
* the returned string. Anything not valid printable ASCII or UTF-8 is
* stripped.
*/
char *
utf8_sanitize(const char *src)
{
char *dst;
size_t n;
enum utf8_state more;
struct utf8_data ud;
u_int i;
dst = NULL;
n = 0;
while (*src != '\0') {
dst = xreallocarray(dst, n + 1, sizeof *dst);
if ((more = utf8_open(&ud, *src)) == UTF8_MORE) {
while (*++src != '\0' && more == UTF8_MORE)
more = utf8_append(&ud, *src);
if (more == UTF8_DONE) {
dst = xreallocarray(dst, n + ud.width,
sizeof *dst);
for (i = 0; i < ud.width; i++)
dst[n++] = '_';
continue;
}
src -= ud.have;
}
if (*src > 0x1f && *src < 0x7f)
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dst[n++] = *src;
else
dst[n++] = '_';
src++;
}
dst = xreallocarray(dst, n + 1, sizeof *dst);
dst[n] = '\0';
return (dst);
}
/* Get UTF-8 buffer length. */
size_t
utf8_strlen(const struct utf8_data *s)
{
size_t i;
for (i = 0; s[i].size != 0; i++)
/* nothing */;
return (i);
}
/* Get UTF-8 string width. */
u_int
utf8_strwidth(const struct utf8_data *s, ssize_t n)
{
ssize_t i;
u_int width;
width = 0;
for (i = 0; s[i].size != 0; i++) {
if (n != -1 && n == i)
break;
width += s[i].width;
}
return (width);
}
/*
* Convert a string into a buffer of UTF-8 characters. Terminated by size == 0.
* Caller frees.
*/
struct utf8_data *
utf8_fromcstr(const char *src)
{
struct utf8_data *dst;
size_t n;
enum utf8_state more;
dst = NULL;
n = 0;
while (*src != '\0') {
dst = xreallocarray(dst, n + 1, sizeof *dst);
if ((more = utf8_open(&dst[n], *src)) == UTF8_MORE) {
while (*++src != '\0' && more == UTF8_MORE)
more = utf8_append(&dst[n], *src);
if (more == UTF8_DONE) {
n++;
continue;
}
src -= dst[n].have;
}
utf8_set(&dst[n], *src);
n++;
src++;
}
dst = xreallocarray(dst, n + 1, sizeof *dst);
dst[n].size = 0;
return (dst);
}
/* Convert from a buffer of UTF-8 characters into a string. Caller frees. */
char *
utf8_tocstr(struct utf8_data *src)
{
char *dst;
size_t n;
dst = NULL;
n = 0;
for(; src->size != 0; src++) {
dst = xreallocarray(dst, n + src->size, 1);
memcpy(dst + n, src->data, src->size);
n += src->size;
}
dst = xreallocarray(dst, n + 1, 1);
dst[n] = '\0';
return (dst);
}
/* Get width of UTF-8 string. */
u_int
utf8_cstrwidth(const char *s)
{
struct utf8_data tmp;
u_int width;
enum utf8_state more;
width = 0;
while (*s != '\0') {
if ((more = utf8_open(&tmp, *s)) == UTF8_MORE) {
while (*++s != '\0' && more == UTF8_MORE)
more = utf8_append(&tmp, *s);
if (more == UTF8_DONE) {
width += tmp.width;
continue;
}
s -= tmp.have;
}
if (*s > 0x1f && *s != 0x7f)
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width++;
s++;
}
return (width);
}
/* Trim UTF-8 string to width. Caller frees. */
char *
utf8_trimcstr(const char *s, u_int width)
{
struct utf8_data *tmp, *next;
char *out;
u_int at;
tmp = utf8_fromcstr(s);
at = 0;
for (next = tmp; next->size != 0; next++) {
if (at + next->width > width) {
next->size = 0;
break;
}
at += next->width;
}
out = utf8_tocstr(tmp);
free(tmp);
return (out);
}
/* Trim UTF-8 string to width. Caller frees. */
char *
utf8_rtrimcstr(const char *s, u_int width)
{
struct utf8_data *tmp, *next, *end;
char *out;
u_int at;
tmp = utf8_fromcstr(s);
for (end = tmp; end->size != 0; end++)
/* nothing */;
if (end == tmp) {
free(tmp);
return (xstrdup(""));
}
next = end - 1;
at = 0;
for (;;)
{
if (at + next->width > width) {
next++;
break;
}
at += next->width;
if (next == tmp)
break;
next--;
}
out = utf8_tocstr(next);
free(tmp);
return (out);
}
/* Pad UTF-8 string to width. Caller frees. */
char *
utf8_padcstr(const char *s, u_int width)
{
size_t slen;
char *out;
u_int n, i;
n = utf8_cstrwidth(s);
if (n >= width)
return (xstrdup(s));
slen = strlen(s);
out = xmalloc(slen + 1 + (width - n));
memcpy(out, s, slen);
for (i = n; i < width; i++)
out[slen++] = ' ';
out[slen] = '\0';
return (out);
}