Atlas - SDL_zenitymessagebox.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
24#include "SDL_zenitymessagebox.h"
25
26#define ZENITY_VERSION_LEN 32 // Number of bytes to read from zenity --version (including NUL)
27
28#define MAX_BUTTONS 8 // Maximum number of buttons supported
29
30static bool parse_zenity_version(const char *version, int *major, int *minor)
31{
32    /* We expect the version string is in the form of MAJOR.MINOR.MICRO
33     * as described in meson.build. We'll ignore everything after that.
34     */
35    const char *version_ptr = version;
36    char *end_ptr = NULL;
37    int tmp = (int) SDL_strtol(version_ptr, &end_ptr, 10);
38    if (tmp == 0 && end_ptr == version_ptr) {
39        return SDL_SetError("failed to get zenity major version number");
40    }
41    *major = tmp;
42
43    if (*end_ptr == '.') {
44        version_ptr = end_ptr + 1; // skip the dot
45        tmp = (int) SDL_strtol(version_ptr, &end_ptr, 10);
46        if (tmp == 0 && end_ptr == version_ptr) {
47            return SDL_SetError("failed to get zenity minor version number");
48        }
49        *minor = tmp;
50    } else {
51        *minor = 0;
52    }
53    return true;
54}
55
56bool SDL_get_zenity_version(int *major, int *minor)
57{
58    const char *argv[] = { "zenity", "--version", NULL };
59    bool result = false;
60
61    SDL_Process *process = SDL_CreateProcess(argv, true);
62    if (!process) {
63        return false;
64    }
65
66    char *output = SDL_ReadProcess(process, NULL, NULL);
67    if (output) {
68        result = parse_zenity_version(output, major, minor);
69        SDL_free(output);
70    }
71    SDL_DestroyProcess(process);
72
73    return result;
74}
75
76bool SDL_Zenity_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonID)
77{
78    int exit_code = -1;
79    int zenity_major = 0, zenity_minor = 0, output_len = 0;
80    int argc = 5, i;
81    const char *argv[5 + 2 /* icon name */ + 2 /* title */ + 2 /* message */ + 2 * MAX_BUTTONS + 1 /* NULL */] = {
82        "zenity", "--question", "--switch", "--no-wrap", "--no-markup"
83    };
84    SDL_Process *process;
85
86    if (messageboxdata->numbuttons > MAX_BUTTONS) {
87        return SDL_SetError("Too many buttons (%d max allowed)", MAX_BUTTONS);
88    }
89
90    // get zenity version so we know which arg to use
91    if (!SDL_get_zenity_version(&zenity_major, &zenity_minor)) {
92        return false; // get_zenity_version() calls SDL_SetError(), so message is already set
93    }
94
95    /* https://gitlab.gnome.org/GNOME/zenity/-/commit/c686bdb1b45e95acf010efd9ca0c75527fbb4dea
96     * This commit removed --icon-name without adding a deprecation notice.
97     * We need to handle it gracefully, otherwise no message box will be shown.
98     */
99    argv[argc++] = zenity_major > 3 || (zenity_major == 3 && zenity_minor >= 90) ? "--icon" : "--icon-name";
100    switch (messageboxdata->flags & (SDL_MESSAGEBOX_ERROR | SDL_MESSAGEBOX_WARNING | SDL_MESSAGEBOX_INFORMATION)) {
101    case SDL_MESSAGEBOX_ERROR:
102        argv[argc++] = "dialog-error";
103        break;
104    case SDL_MESSAGEBOX_WARNING:
105        argv[argc++] = "dialog-warning";
106        break;
107    case SDL_MESSAGEBOX_INFORMATION:
108    default:
109        argv[argc++] = "dialog-information";
110        break;
111    }
112
113    if (messageboxdata->title && messageboxdata->title[0]) {
114        argv[argc++] = "--title";
115        argv[argc++] = messageboxdata->title;
116    } else {
117        argv[argc++] = "--title=";
118    }
119
120    if (messageboxdata->message && messageboxdata->message[0]) {
121        argv[argc++] = "--text";
122        argv[argc++] = messageboxdata->message;
123    } else {
124        argv[argc++] = "--text=";
125    }
126
127    for (i = 0; i < messageboxdata->numbuttons; ++i) {
128        if (messageboxdata->buttons[i].text && messageboxdata->buttons[i].text[0]) {
129            int len = SDL_strlen(messageboxdata->buttons[i].text);
130            if (len > output_len) {
131                output_len = len;
132            }
133
134            argv[argc++] = "--extra-button";
135            argv[argc++] = messageboxdata->buttons[i].text;
136        } else {
137            argv[argc++] = "--extra-button=";
138        }
139    }
140    if (messageboxdata->numbuttons == 0) {
141        argv[argc++] = "--extra-button=OK";
142    }
143    argv[argc] = NULL;
144
145    SDL_PropertiesID props = SDL_CreateProperties();
146    if (!props) {
147        return false;
148    }
149    SDL_SetPointerProperty(props, SDL_PROP_PROCESS_CREATE_ARGS_POINTER, argv);
150    // If buttonID is set we need to wait and read the results
151    if (buttonID) {
152        SDL_SetNumberProperty(props, SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER, SDL_PROCESS_STDIO_APP);
153    } else {
154        SDL_SetNumberProperty(props, SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER, SDL_PROCESS_STDIO_NULL);
155    }
156    process = SDL_CreateProcessWithProperties(props);
157    SDL_DestroyProperties(props);
158    if (!process) {
159        return false;
160    }
161    if (buttonID) {
162        char *output = SDL_ReadProcess(process, NULL, &exit_code);
163        if (exit_code < 0 || exit_code == 255) {
164            SDL_free(output);
165        } else if (output) {
166            // It likes to add a newline...
167            char *tmp = SDL_strrchr(output, '\n');
168            if (tmp) {
169                *tmp = '\0';
170            }
171
172            // Check which button got pressed
173            for (i = 0; i < messageboxdata->numbuttons; i += 1) {
174                if (messageboxdata->buttons[i].text) {
175                    if (SDL_strcmp(output, messageboxdata->buttons[i].text) == 0) {
176                        *buttonID = messageboxdata->buttons[i].buttonID;
177                        break;
178                    }
179                }
180            }
181            SDL_free(output);
182        }
183    } else {
184        SDL_WaitProcess(process, true, &exit_code);
185    }
186    SDL_DestroyProcess(process);
187
188    return !(exit_code < 0 || exit_code == 255);
189}
190
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