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grid-utf8.c    97 lines (82 with data), 2.6 kB

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/* $OpenBSD$ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 <string.h>
#include "tmux.h"
/*
* Grid UTF-8 utility functions.
*/
/* Calculate UTF-8 grid cell size. Data is terminated by 0xff. */
size_t
grid_utf8_size(const struct grid_utf8 *gu)
{
size_t size;
for (size = 0; size < sizeof gu->data; size++) {
if (gu->data[size] == 0xff)
break;
}
return (size);
}
/* Copy UTF-8 out into a buffer. */
size_t
grid_utf8_copy(const struct grid_utf8 *gu, char *buf, size_t len)
{
size_t size;
size = grid_utf8_size(gu);
if (size > len)
fatalx("UTF-8 copy overflow");
memcpy(buf, gu->data, size);
return (size);
}
/* Set UTF-8 grid data from input UTF-8. */
void
grid_utf8_set(struct grid_utf8 *gu, const struct utf8_data *utf8data)
{
if (utf8data->size == 0)
fatalx("UTF-8 data empty");
if (utf8data->size > sizeof gu->data)
fatalx("UTF-8 data too long");
memcpy(gu->data, utf8data->data, utf8data->size);
if (utf8data->size != sizeof gu->data)
gu->data[utf8data->size] = 0xff;
gu->width = utf8data->width;
}
/* Append UTF-8 character onto the cell data (for combined characters). */
int
grid_utf8_append(struct grid_utf8 *gu, const struct utf8_data *utf8data)
{
size_t old_size;
old_size = grid_utf8_size(gu);
if (old_size + utf8data->size > sizeof gu->data)
return (-1);
memcpy(gu->data + old_size, utf8data->data, utf8data->size);
if (old_size + utf8data->size != sizeof gu->data)
gu->data[old_size + utf8data->size] = 0xff;
return (0);
}
/* Compare two UTF-8 cells. */
int
grid_utf8_compare(const struct grid_utf8 *gu1, const struct grid_utf8 *gu2)
{
size_t size;
size = grid_utf8_size(gu1);
if (size != grid_utf8_size(gu2))
return (0);
if (memcmp(gu1->data, gu2->data, size) != 0)
return (0);
return (1);
}