grid-utf8.c

   1 /* $OpenBSD$ */
   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);
  95         return (1);
  96 }