Atlas - SDL_locale.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21
22#include "SDL_internal.h"
23#include "SDL_syslocale.h"
24
25static SDL_Locale **build_locales_from_csv_string(char *csv, int *count)
26{
27    int i, num_locales;
28    size_t slen;
29    size_t alloclen;
30    char *ptr;
31    SDL_Locale *loc;
32    SDL_Locale **result;
33
34    if (count) {
35        *count = 0;
36    }
37
38    while (csv && *csv && SDL_isspace(*csv)) {
39        ++csv;
40    }
41    if (!csv || !*csv) {
42        return NULL; // nothing to report
43    }
44
45    num_locales = 1; // at least one
46    for (ptr = csv; *ptr; ptr++) {
47        if (*ptr == ',') {
48            num_locales++;
49        }
50    }
51
52    slen = ((size_t)(ptr - csv)) + 1; // SDL_strlen(csv) + 1
53    alloclen = ((num_locales + 1) * sizeof(SDL_Locale *)) + (num_locales * sizeof(SDL_Locale)) + slen;
54
55    result = (SDL_Locale **)SDL_calloc(1, alloclen);
56    if (!result) {
57        return NULL; // oh well
58    }
59    loc = (SDL_Locale *)(result + (num_locales + 1));
60    ptr = (char *)(loc + num_locales);
61    SDL_memcpy(ptr, csv, slen);
62
63    i = 0;
64    result[i++] = loc;
65    while (true) { // parse out the string
66        while (SDL_isspace(*ptr)) {
67            ptr++; // skip whitespace.
68        }
69
70        if (*ptr == '\0') {
71            break;
72        }
73        loc->language = ptr++;
74        while (true) {
75            const char ch = *ptr;
76            if (ch == '_') {
77                *(ptr++) = '\0';
78                loc->country = ptr;
79            } else if (SDL_isspace(ch)) {
80                *(ptr++) = '\0'; // trim ending whitespace and keep going.
81            } else if (ch == ',') {
82                *(ptr++) = '\0';
83                loc++;
84                result[i++] = loc;
85                break;
86            } else if (ch == '\0') {
87                break;
88            } else {
89                ptr++; // just keep going, still a valid string
90            }
91        }
92    }
93
94    if (count) {
95        *count = num_locales;
96    }
97
98    return result;
99}
100
101SDL_Locale **SDL_GetPreferredLocales(int *count)
102{
103    char locbuf[128]; // enough for 21 "xx_YY," language strings.
104    const char *hint = SDL_GetHint(SDL_HINT_PREFERRED_LOCALES);
105    if (hint) {
106        SDL_strlcpy(locbuf, hint, sizeof(locbuf));
107    } else {
108        SDL_zeroa(locbuf);
109        SDL_SYS_GetPreferredLocales(locbuf, sizeof(locbuf));
110    }
111    return build_locales_from_csv_string(locbuf, count);
112}
113
[FILE END]
(C) 2025 0x4248
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