zenilib: zenilib/jni/external/sdl/src/filesystem/unix/SDL_sysfilesystem.c Source File

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SDL_sysfilesystem.c
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1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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 #include "SDL_config.h"
22
23 #ifdef SDL_FILESYSTEM_UNIX
24
25 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
26 /* System dependent filesystem routines */
27
28 #include <errno.h>
29 #include <stdio.h>
30 #include <unistd.h>
31 #include <stdlib.h>
32 #include <sys/stat.h>
33 #include <sys/types.h>
34 #include <limits.h>
35
36 #ifdef __FREEBSD__
37 #include <sys/sysctl.h>
38 #endif
39
40 #include "SDL_error.h"
41 #include "SDL_stdinc.h"
42 #include "SDL_filesystem.h"
43
44 static char *
45 readSymLink(const char *path)
46 {
47 char *retval = NULL;
48 ssize_t len = 64;
49 ssize_t rc = -1;
50
51 while (1)
52 {
53 char *ptr = (char *) SDL_realloc(retval, (size_t) len);
54 if (ptr == NULL) {
55 SDL_OutOfMemory();
56 break;
57 }
58
59 retval = ptr;
60
61 rc = readlink(path, retval, len);
62 if (rc == -1) {
63 break; /* not a symlink, i/o error, etc. */
64 } else if (rc < len) {
65 retval[rc] = '\0'; /* readlink doesn't null-terminate. */
66 return retval; /* we're good to go. */
67 }
68
69 len *= 2; /* grow buffer, try again. */
70 }
71
72 SDL_free(retval);
73 return NULL;
74 }
75
76
77 char *
78 SDL_GetBasePath(void)
79 {
80 char *retval = NULL;
81
82 #if defined(__FREEBSD__)
83 char fullpath[PATH_MAX];
84 size_t buflen = sizeof (fullpath);
85 const int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
86 if (sysctl(mib, SDL_arraysize(mib), fullpath, &buflen, NULL, 0) != -1) {
87 retval = SDL_strdup(fullpath);
88 if (!retval) {
89 SDL_OutOfMemory();
90 return NULL;
91 }
92 }
93 #elif defined(__SOLARIS__)
94 const char *path = getexecname();
95 if ((path != NULL) && (path[0] == '/')) { /* must be absolute path... */
96 retval = SDL_strdup(path);
97 if (!retval) {
98 SDL_OutOfMemory();
99 return NULL;
100 }
101 }
102 #endif
103
104 /* is a Linux-style /proc filesystem available? */
105 if (!retval && (access("/proc", F_OK) == 0)) {
106 #if defined(__FREEBSD__)
107 retval = readSymLink("/proc/curproc/file");
108 #elif defined(__NETBSD__)
109 retval = readSymLink("/proc/curproc/exe");
110 #else
111 retval = readSymLink("/proc/self/exe"); /* linux. */
112 #endif
113 if (retval == NULL) {
114 /* older kernels don't have /proc/self ... try PID version... */
115 char path[64];
116 const int rc = (int) SDL_snprintf(path, sizeof(path),
117 "/proc/%llu/exe",
118 (unsigned long long) getpid());
119 if ( (rc > 0) && (rc < sizeof(path)) ) {
120 retval = readSymLink(path);
121 }
122 }
123 }
124
125 /* If we had access to argv[0] here, we could check it for a path,
126 or troll through $PATH looking for it, too. */
127
128 if (retval != NULL) { /* chop off filename. */
129 char *ptr = SDL_strrchr(retval, '/');
130 if (ptr != NULL) {
131 *(ptr+1) = '\0';
132 } else { /* shouldn't happen, but just in case... */
133 SDL_free(retval);
134 retval = NULL;
135 }
136 }
137
138 if (retval != NULL) {
139 /* try to shrink buffer... */
140 char *ptr = (char *) SDL_realloc(retval, strlen(retval) + 1);
141 if (ptr != NULL)
142 retval = ptr; /* oh well if it failed. */
143 }
144
145 return retval;
146 }
147
148 char *
149 SDL_GetPrefPath(const char *org, const char *app)
150 {
151 /*
152 * We use XDG's base directory spec, even if you're not on Linux.
153 * This isn't strictly correct, but the results are relatively sane
154 * in any case.
155 *
156 * http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
157 */
158 const char *envr = SDL_getenv("XDG_DATA_HOME");
159 const char *append;
160 char *retval = NULL;
161 char *ptr = NULL;
162 size_t len = 0;
163
164 if (!envr) {
165 /* You end up with "$HOME/.local/share/Game Name 2" */
166 envr = SDL_getenv("HOME");
167 if (!envr) {
168 /* we could take heroic measures with /etc/passwd, but oh well. */
169 SDL_SetError("neither XDG_DATA_HOME nor HOME environment is set");
170 return NULL;
171 }
172 append = "/.local/share/";
173 } else {
174 append = "/";
175 }
176
177 len = SDL_strlen(envr);
178 if (envr[len - 1] == '/')
179 append += 1;
180
181 len += SDL_strlen(append) + SDL_strlen(app) + 2;
182 retval = (char *) SDL_malloc(len);
183 if (!retval) {
184 SDL_OutOfMemory();
185 return NULL;
186 }
187
188 SDL_snprintf(retval, len, "%s%s%s/", envr, append, app);
189
190 for (ptr = retval+1; *ptr; ptr++) {
191 if (*ptr == '/') {
192 *ptr = '\0';
193 if (mkdir(retval, 0700) != 0 && errno != EEXIST)
194 goto error;
195 *ptr = '/';
196 }
197 }
198 if (mkdir(retval, 0700) != 0 && errno != EEXIST) {
199 error:
200 SDL_SetError("Couldn't create directory '%s': ", retval, strerror(errno));
201 SDL_free(retval);
202 return NULL;
203 }
204
205 return retval;
206 }
207
208 #endif /* SDL_FILESYSTEM_UNIX */
209
210 /* vi: set ts=4 sw=4 expandtab: */
NULL
#define NULL
Definition: ftobjs.h:61
SDL_snprintf
DECLSPEC int SDLCALL SDL_snprintf(char *text, size_t maxlen, const char *fmt,...)
Definition: SDL_string.c:1277
SDL_realloc
DECLSPEC void *SDLCALL SDL_realloc(void *mem, size_t size)
SDL_strrchr
DECLSPEC char *SDLCALL SDL_strrchr(const char *str, int c)
Definition: SDL_string.c:593
SDL_free
DECLSPEC void SDLCALL SDL_free(void *mem)
SDL_GetPrefPath
DECLSPEC char *SDLCALL SDL_GetPrefPath(const char *org, const char *app)
Get the user-and-app-specific path where files can be written.
len
GLenum GLsizei len
Definition: glew.h:7035
path
GLsizei const GLchar *const * path
Definition: glew.h:5828
SDL_config.h
int
int
Definition: SDL_systhread.c:37
error
FT_Error error
Definition: cffdrivr.c:407
SDL_strdup
DECLSPEC char *SDLCALL SDL_strdup(const char *str)
Definition: SDL_string.c:511
SDL_SetError
DECLSPEC int SDLCALL SDL_SetError(const char *fmt,...)
Definition: SDL_error.c:53
SDL_malloc
DECLSPEC void *SDLCALL SDL_malloc(size_t size)
SDL_strlen
DECLSPEC size_t SDLCALL SDL_strlen(const char *str)
Definition: SDL_string.c:389
PATH_MAX
#define PATH_MAX
Definition: hrtf.c:34
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_arraysize
#define SDL_arraysize(array)
Definition: SDL_stdinc.h:83
access
GLenum access
Definition: glew.h:3469
SDL_filesystem.h
Include file for filesystem SDL API functions.
SDL_getenv
DECLSPEC char *SDLCALL SDL_getenv(const char *name)
Definition: SDL_getenv.c:179
types.h
SDL_GetBasePath
DECLSPEC char *SDLCALL SDL_GetBasePath(void)
Get the path where the application resides.
SDL_error.h