chore(build): revert to sdl2

vendor/sdl-2.30.5/src/filesystem/unix/SDL_sysfilesystem.c

@@ -0,0 +1,347 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_FILESYSTEM_UNIX
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/* System dependent filesystem routines                                */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <limits.h>
+#include <fcntl.h>
+
+#if defined(__FREEBSD__) || defined(__OPENBSD__)
+#include <sys/sysctl.h>
+#endif
+
+#include "SDL_error.h"
+#include "SDL_stdinc.h"
+#include "SDL_filesystem.h"
+#include "SDL_rwops.h"
+
+/* QNX's /proc/self/exefile is a text file and not a symlink. */
+#if !defined(__QNXNTO__)
+static char *readSymLink(const char *path)
+{
+    char *retval = NULL;
+    ssize_t len = 64;
+    ssize_t rc = -1;
+
+    while (1) {
+        char *ptr = (char *)SDL_realloc(retval, (size_t)len);
+        if (!ptr) {
+            SDL_OutOfMemory();
+            break;
+        }
+
+        retval = ptr;
+
+        rc = readlink(path, retval, len);
+        if (rc == -1) {
+            break; /* not a symlink, i/o error, etc. */
+        } else if (rc < len) {
+            retval[rc] = '\0'; /* readlink doesn't null-terminate. */
+            return retval;     /* we're good to go. */
+        }
+
+        len *= 2; /* grow buffer, try again. */
+    }
+
+    SDL_free(retval);
+    return NULL;
+}
+#endif
+
+
+#if defined(__OPENBSD__)
+static char *search_path_for_binary(const char *bin)
+{
+    char *envr = SDL_getenv("PATH");
+    size_t alloc_size;
+    char *exe = NULL;
+    char *start = envr;
+    char *ptr;
+
+    if (!envr) {
+        SDL_SetError("No $PATH set");
+        return NULL;
+    }
+
+    envr = SDL_strdup(envr);
+    if (!envr) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    SDL_assert(bin != NULL);
+
+    alloc_size = SDL_strlen(bin) + SDL_strlen(envr) + 2;
+    exe = (char *)SDL_malloc(alloc_size);
+
+    do {
+        ptr = SDL_strchr(start, ':'); /* find next $PATH separator. */
+        if (ptr != start) {
+            if (ptr) {
+                *ptr = '\0';
+            }
+
+            /* build full binary path... */
+            SDL_snprintf(exe, alloc_size, "%s%s%s", start, (ptr && (ptr[-1] == '/')) ? "" : "/", bin);
+
+            if (access(exe, X_OK) == 0) { /* Exists as executable? We're done. */
+                SDL_free(envr);
+                return exe;
+            }
+        }
+        start = ptr + 1; /* start points to beginning of next element. */
+    } while (ptr);
+
+    SDL_free(envr);
+    SDL_free(exe);
+
+    SDL_SetError("Process not found in $PATH");
+    return NULL; /* doesn't exist in path. */
+}
+#endif
+
+char *SDL_GetBasePath(void)
+{
+    char *retval = NULL;
+
+#if defined(__FREEBSD__)
+    char fullpath[PATH_MAX];
+    size_t buflen = sizeof(fullpath);
+    const int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+    if (sysctl(mib, SDL_arraysize(mib), fullpath, &buflen, NULL, 0) != -1) {
+        retval = SDL_strdup(fullpath);
+        if (!retval) {
+            SDL_OutOfMemory();
+            return NULL;
+        }
+    }
+#endif
+#if defined(__OPENBSD__)
+    /* Please note that this will fail if the process was launched with a relative path and $PWD + the cwd have changed, or argv is altered. So don't do that. Or add a new sysctl to OpenBSD. */
+    char **cmdline;
+    size_t len;
+    const int mib[] = { CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV };
+    if (sysctl(mib, 4, NULL, &len, NULL, 0) != -1) {
+        char *exe, *pwddst;
+        char *realpathbuf = (char *)SDL_malloc(PATH_MAX + 1);
+        if (!realpathbuf) {
+            SDL_OutOfMemory();
+            return NULL;
+        }
+
+        cmdline = SDL_malloc(len);
+        if (!cmdline) {
+            SDL_free(realpathbuf);
+            SDL_OutOfMemory();
+            return NULL;
+        }
+
+        sysctl(mib, 4, cmdline, &len, NULL, 0);
+
+        exe = cmdline[0];
+        pwddst = NULL;
+        if (SDL_strchr(exe, '/') == NULL) { /* not a relative or absolute path, check $PATH for it */
+            exe = search_path_for_binary(cmdline[0]);
+        } else {
+            if (exe && *exe == '.') {
+                const char *pwd = SDL_getenv("PWD");
+                if (pwd && *pwd) {
+                    SDL_asprintf(&pwddst, "%s/%s", pwd, exe);
+                }
+            }
+        }
+
+        if (exe) {
+            if (!pwddst) {
+                if (realpath(exe, realpathbuf) != NULL) {
+                    retval = realpathbuf;
+                }
+            } else {
+                if (realpath(pwddst, realpathbuf) != NULL) {
+                    retval = realpathbuf;
+                }
+                SDL_free(pwddst);
+            }
+
+            if (exe != cmdline[0]) {
+                SDL_free(exe);
+            }
+        }
+
+        if (!retval) {
+            SDL_free(realpathbuf);
+        }
+
+        SDL_free(cmdline);
+    }
+#endif
+
+    /* is a Linux-style /proc filesystem available? */
+    if (!retval && (access("/proc", F_OK) == 0)) {
+        /* !!! FIXME: after 2.0.6 ships, let's delete this code and just
+                      use the /proc/%llu version. There's no reason to have
+                      two copies of this plus all the #ifdefs. --ryan. */
+#if defined(__FREEBSD__)
+        retval = readSymLink("/proc/curproc/file");
+#elif defined(__NETBSD__)
+        retval = readSymLink("/proc/curproc/exe");
+#elif defined(__SOLARIS__)
+        retval = readSymLink("/proc/self/path/a.out");
+#elif defined(__QNXNTO__)
+        retval = SDL_LoadFile("/proc/self/exefile", NULL);
+#else
+        retval = readSymLink("/proc/self/exe"); /* linux. */
+        if (!retval) {
+            /* older kernels don't have /proc/self ... try PID version... */
+            char path[64];
+            const int rc = SDL_snprintf(path, sizeof(path),
+                                        "/proc/%llu/exe",
+                                        (unsigned long long)getpid());
+            if ((rc > 0) && (rc < sizeof(path))) {
+                retval = readSymLink(path);
+            }
+        }
+#endif
+    }
+
+#if defined(__SOLARIS__)  /* try this as a fallback if /proc didn't pan out */
+    if (!retval) {
+        const char *path = getexecname();
+        if ((path != NULL) && (path[0] == '/')) { /* must be absolute path... */
+            retval = SDL_strdup(path);
+            if (!retval) {
+                SDL_OutOfMemory();
+                return NULL;
+            }
+        }
+    }
+#endif
+
+    /* If we had access to argv[0] here, we could check it for a path,
+        or troll through $PATH looking for it, too. */
+
+    if (retval) { /* chop off filename. */
+        char *ptr = SDL_strrchr(retval, '/');
+        if (ptr) {
+            *(ptr + 1) = '\0';
+        } else { /* shouldn't happen, but just in case... */
+            SDL_free(retval);
+            retval = NULL;
+        }
+    }
+
+    if (retval) {
+        /* try to shrink buffer... */
+        char *ptr = (char *)SDL_realloc(retval, SDL_strlen(retval) + 1);
+        if (ptr) {
+            retval = ptr; /* oh well if it failed. */
+        }
+    }
+
+    return retval;
+}
+
+char *SDL_GetPrefPath(const char *org, const char *app)
+{
+    /*
+     * We use XDG's base directory spec, even if you're not on Linux.
+     *  This isn't strictly correct, but the results are relatively sane
+     *  in any case.
+     *
+     * http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+     */
+    const char *envr = SDL_getenv("XDG_DATA_HOME");
+    const char *append;
+    char *retval = NULL;
+    char *ptr = NULL;
+    size_t len = 0;
+
+    if (!app) {
+        SDL_InvalidParamError("app");
+        return NULL;
+    }
+    if (!org) {
+        org = "";
+    }
+
+    if (!envr) {
+        /* You end up with "$HOME/.local/share/Game Name 2" */
+        envr = SDL_getenv("HOME");
+        if (!envr) {
+            /* we could take heroic measures with /etc/passwd, but oh well. */
+            SDL_SetError("neither XDG_DATA_HOME nor HOME environment is set");
+            return NULL;
+        }
+        append = "/.local/share/";
+    } else {
+        append = "/";
+    }
+
+    len = SDL_strlen(envr);
+    if (envr[len - 1] == '/') {
+        append += 1;
+    }
+
+    len += SDL_strlen(append) + SDL_strlen(org) + SDL_strlen(app) + 3;
+    retval = (char *)SDL_malloc(len);
+    if (!retval) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    if (*org) {
+        (void)SDL_snprintf(retval, len, "%s%s%s/%s/", envr, append, org, app);
+    } else {
+        (void)SDL_snprintf(retval, len, "%s%s%s/", envr, append, app);
+    }
+
+    for (ptr = retval + 1; *ptr; ptr++) {
+        if (*ptr == '/') {
+            *ptr = '\0';
+            if (mkdir(retval, 0700) != 0 && errno != EEXIST) {
+                goto error;
+            }
+            *ptr = '/';
+        }
+    }
+    if (mkdir(retval, 0700) != 0 && errno != EEXIST) {
+    error:
+        SDL_SetError("Couldn't create directory '%s': '%s'", retval, strerror(errno));
+        SDL_free(retval);
+        return NULL;
+    }
+
+    return retval;
+}
+
+#endif /* SDL_FILESYSTEM_UNIX */
+
+/* vi: set ts=4 sw=4 expandtab: */