summaryrefslogtreecommitdiff
path: root/Build/source/texk/gregorio/gregorio-src/src/unicode.c
blob: fa9e2a4ac876f4a74566903cc0038df4647ff59f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 * Gregorio is a program that translates gabc files to GregorioTeX
 * This file contains functions providing UTF-8 support.
 *
 * Copyright (C) 2008-2019 The Gregorio Project (see CONTRIBUTORS.md)
 *
 * This file is part of Gregorio.
 *
 * Gregorio is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Gregorio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Gregorio.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#include <stdio.h>
#include <string.h> /* for strlen */
#include <stdlib.h>
#include "struct.h"
#include "unicode.h"
#include "messages.h"
#include "support.h"

/*
 * 
 * This file contains some functions to handle UTF-8 correctly. We chose to
 * embed them instead of relying on locale or glib, for simplification: with
 * these functions we don't rely on anything locale-dependant (such as
 * wchar_t). The reason is that Windows XP (...) is not UTF-8 and thus would
 * need the glib in oder to run, which make dependencies much bigger.
 * 
 */

/* an utf8 version of mbstowcs */

/* expects a buffer of size n + 1 */
static bool gregorio_mbstowcs(grewchar *dest, const char *src, size_t n)
{
    bool success = true;
    unsigned char bytes_to_come;
    grewchar result = 0;
    unsigned char c;
    size_t res = 0; /* number of bytes we've done so far */
    gregorio_not_null(src, gregorio_mbstowcs, return false);
    gregorio_not_null(dest, gregorio_mbstowcs, return false);
    while (success && *src && res < n) {
        c = (unsigned char) (*src);
        if (c < 128) { /* 0100xxxx */
            /* one-byte symbol */
            bytes_to_come = 0;
            result = c;
        } else if (c >= 240) { /* 1111xxxx */
            /* start of a four-byte symbol */
            /* printf("%d\n", c); */
            bytes_to_come = 3;
            result = (result << 3) | (c & 7);
        } else if (c >= 224) { /* 1110xxxx */
            /* start of a three-byte symbol */
            /* printf("%d\n", c); */
            bytes_to_come = 2;
            result = (result << 4) | (c & 15);
        } else if (c >= 192) { /* 1100xxxx */
            /* start of a two-byte symbol */
            /* printf("%d\n", c); */
            bytes_to_come = 1;
            result = (result << 5) | (c & 31);
        } else {
            /* printf("%s %d %d\n", src, res, c); */
            gregorio_message(_("malformed UTF-8 sequence1"),
                    "gregorio_mbstowcs", VERBOSITY_ERROR, 0);
            success = false;
            break;
        }
        while (bytes_to_come > 0) {
            bytes_to_come--;
            src++;
            c = (unsigned char) (*src);
            if (c < 192 && c >= 128) /* 1000xxxx */
            {
                result = (result << 6) | (c & 63);
            } else {
                gregorio_message(_("malformed UTF-8 sequence2"),
                        "gregorio_mbstowcs", VERBOSITY_ERROR, 0);
                success = false;
                break;
            }
        }
        dest[res] = result;

        res++;
        result = 0;
        src++;
    }
    dest[res] = 0;
    return success;
}

/* the value returned by this function must be freed! */
grewchar *gregorio_build_grewchar_string_from_buf(const char *const buf)
{
    size_t len;
    grewchar *gwstring;
    /* this doesn't currently happen, but it's safer to keep this check */
    if (buf == NULL) {
        return NULL; /* LCOV_EXCL_LINE */
    }
    len = strlen(buf); /* to get the length of the syllable in ASCII */
    gwstring = (grewchar *) gregorio_malloc((len + 1) * sizeof(grewchar));
    gregorio_mbstowcs(gwstring, buf, len); /* converting into grewchar */
    /* no need to check the return code; if it failed, the error state would
     * already be in place */
    return gwstring;
}

/* the function to build a gregorio_character list from a buffer. */

gregorio_character *gregorio_build_char_list_from_buf(const char *const buf)
{
    int i = 0;
    grewchar *gwstring;
    gregorio_character *current_character = NULL;
    /* this doesn't currently happen, but it's safer to keep this check */
    if (buf == NULL) {
        return NULL; /* LCOV_EXCL_LINE */
    }
    gwstring = gregorio_build_grewchar_string_from_buf(buf);
    /* we add the corresponding characters in the list of gregorio_characters */
    while (gwstring[i]) {
        gregorio_add_character(&current_character, gwstring[i]);
        i++;
    }
    free(gwstring);
    gregorio_go_to_first_character_c(&current_character);
    return current_character;
}

void gregorio_print_unichar(FILE *f, const grewchar to_print)
{
    if (to_print <= 0x7F) {
        fprintf(f, "%c", (unsigned char) to_print);
        return;
    }
    if (to_print >= 0x80 && to_print <= 0x7FF) {
        fprintf(f, "%c%c", 0xC0 | (to_print >> 6), 0x80 | (to_print & 0x3F));
        return;
    }
    if ((to_print >= 0x800 && to_print <= 0xD7FF) ||
        (to_print >= 0xE000 && to_print <= 0xFFFF)) {
        fprintf(f, "%c%c%c", 0xE0 | (to_print >> 12),
                0x80 | ((to_print >> 6) & 0x3F), 0x80 | (to_print & 0x3F));
        return;
    }
    if (to_print >= 0x10000 && to_print <= 0x10FFFF) {
        fprintf(f, "%c%c%c%c", 0xF0 | (to_print >> 18),
                0x80 | ((to_print >> 12) & 0x3F),
                0x80 | ((to_print >> 6) & 0x3F), 0x80 | (to_print & 0x3F));
    }
}

void gregorio_print_unistring(FILE *f, const grewchar *first_char)
{
    while (*first_char != 0) {
        gregorio_print_unichar(f, *first_char);
        first_char++;
    }
}