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Annotation of src/usr.bin/tmux/grid-utf8.c, Revision 1.2

1.2     ! nicm        1: /* $OpenBSD: grid-utf8.c,v 1.1 2009/11/18 17:02:17 nicm Exp $ */
1.1       nicm        2:
                      3: /*
                      4:  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
                      5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
                     15:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
                     16:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
                     18:
                     19: #include <sys/types.h>
                     20:
                     21: #include <string.h>
                     22:
                     23: #include "tmux.h"
                     24:
                     25: /*
                     26:  * Grid UTF-8 utility functions.
                     27:  */
                     28:
                     29: /* Calculate UTF-8 grid cell size. Data is terminated by 0xff. */
                     30: size_t
                     31: grid_utf8_size(const struct grid_utf8 *gu)
                     32: {
                     33:        size_t  size;
                     34:
                     35:        for (size = 0; size < sizeof gu->data; size++) {
                     36:                if (gu->data[size] == 0xff)
                     37:                        break;
                     38:        }
                     39:        return (size);
                     40: }
                     41:
                     42: /* Copy UTF-8 out into a buffer. */
                     43: size_t
                     44: grid_utf8_copy(const struct grid_utf8 *gu, char *buf, size_t len)
                     45: {
                     46:        size_t  size;
                     47:
                     48:        size = grid_utf8_size(gu);
                     49:        if (size > len)
                     50:                fatalx("UTF-8 copy overflow");
                     51:        memcpy(buf, gu->data, size);
                     52:        return (size);
                     53: }
                     54:
                     55: /* Set UTF-8 grid data from input UTF-8. */
                     56: void
                     57: grid_utf8_set(struct grid_utf8 *gu, const struct utf8_data *utf8data)
                     58: {
                     59:        if (utf8data->size == 0)
                     60:                fatalx("UTF-8 data empty");
                     61:        if (utf8data->size > sizeof gu->data)
                     62:                fatalx("UTF-8 data too long");
                     63:        memcpy(gu->data, utf8data->data, utf8data->size);
                     64:        if (utf8data->size != sizeof gu->data)
                     65:                gu->data[utf8data->size] = 0xff;
                     66:        gu->width = utf8data->width;
                     67: }
                     68:
                     69: /* Append UTF-8 character onto the cell data (for combined characters). */
                     70: int
                     71: grid_utf8_append(struct grid_utf8 *gu, const struct utf8_data *utf8data)
                     72: {
                     73:        size_t  old_size;
                     74:
                     75:        old_size = grid_utf8_size(gu);
                     76:        if (old_size + utf8data->size > sizeof gu->data)
                     77:                return (-1);
                     78:        memcpy(gu->data + old_size, utf8data->data, utf8data->size);
                     79:        if (old_size + utf8data->size != sizeof gu->data)
                     80:                gu->data[old_size + utf8data->size] = 0xff;
                     81:        return (0);
                     82: }
                     83:
                     84: /* Compare two UTF-8 cells. */
                     85: int
                     86: grid_utf8_compare(const struct grid_utf8 *gu1, const struct grid_utf8 *gu2)
                     87: {
                     88:        size_t  size;
                     89:
                     90:        size = grid_utf8_size(gu1);
                     91:        if (size != grid_utf8_size(gu2))
                     92:                return (0);
                     93:        if (memcmp(gu1->data, gu2->data, size) != 0)
                     94:                return (0);
1.2     ! nicm       95:        return (1);
1.1       nicm       96: }