mirror of
https://github.com/TerryCavanagh/VVVVVV.git
synced 2024-11-14 15:09:42 +01:00
368 lines
9.7 KiB
C
368 lines
9.7 KiB
C
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/*
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* Unix support routines for PhysicsFS.
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*
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* Please see the file LICENSE.txt in the source's root directory.
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*
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* This file written by Ryan C. Gordon.
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*/
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_platforms.h"
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#ifdef PHYSFS_PLATFORM_UNIX
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#include <ctype.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <dirent.h>
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#include <time.h>
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#include <errno.h>
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#include <limits.h>
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#if PHYSFS_NO_CDROM_SUPPORT
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#elif PHYSFS_PLATFORM_LINUX
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# define PHYSFS_HAVE_MNTENT_H 1
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#elif defined __CYGWIN__
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# define PHYSFS_HAVE_MNTENT_H 1
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#elif PHYSFS_PLATFORM_SOLARIS
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# define PHYSFS_HAVE_SYS_MNTTAB_H 1
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#elif PHYSFS_PLATFORM_BSD
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# define PHYSFS_HAVE_SYS_UCRED_H 1
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#else
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# warning No CD-ROM support included. Either define your platform here,
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# warning or define PHYSFS_NO_CDROM_SUPPORT=1 to confirm this is intentional.
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#endif
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#ifdef PHYSFS_HAVE_SYS_UCRED_H
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# ifdef PHYSFS_HAVE_MNTENT_H
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# undef PHYSFS_HAVE_MNTENT_H /* don't do both... */
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# endif
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# include <sys/mount.h>
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# include <sys/ucred.h>
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#endif
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#ifdef PHYSFS_HAVE_MNTENT_H
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#include <mntent.h>
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#endif
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#ifdef PHYSFS_HAVE_SYS_MNTTAB_H
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#include <sys/mnttab.h>
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#endif
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#ifdef PHYSFS_PLATFORM_FREEBSD
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#include <sys/sysctl.h>
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#endif
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#include "physfs_internal.h"
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int __PHYSFS_platformInit(void)
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{
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return 1; /* always succeed. */
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} /* __PHYSFS_platformInit */
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void __PHYSFS_platformDeinit(void)
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{
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/* no-op */
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} /* __PHYSFS_platformDeinit */
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void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
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{
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#if (defined PHYSFS_NO_CDROM_SUPPORT)
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/* no-op. */
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#elif (defined PHYSFS_HAVE_SYS_UCRED_H)
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int i;
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struct statfs *mntbufp = NULL;
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int mounts = getmntinfo(&mntbufp, MNT_NOWAIT);
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for (i = 0; i < mounts; i++)
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{
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int add_it = 0;
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if (strcmp(mntbufp[i].f_fstypename, "iso9660") == 0)
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add_it = 1;
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else if (strcmp( mntbufp[i].f_fstypename, "cd9660") == 0)
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add_it = 1;
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/* add other mount types here */
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if (add_it)
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cb(data, mntbufp[i].f_mntonname);
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} /* for */
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#elif (defined PHYSFS_HAVE_MNTENT_H)
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FILE *mounts = NULL;
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struct mntent *ent = NULL;
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mounts = setmntent("/etc/mtab", "r");
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BAIL_IF(mounts == NULL, PHYSFS_ERR_IO, /*return void*/);
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while ( (ent = getmntent(mounts)) != NULL )
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{
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int add_it = 0;
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if (strcmp(ent->mnt_type, "iso9660") == 0)
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add_it = 1;
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else if (strcmp(ent->mnt_type, "udf") == 0)
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add_it = 1;
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/* !!! FIXME: these might pick up floppy drives, right? */
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else if (strcmp(ent->mnt_type, "auto") == 0)
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add_it = 1;
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else if (strcmp(ent->mnt_type, "supermount") == 0)
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add_it = 1;
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/* add other mount types here */
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if (add_it)
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cb(data, ent->mnt_dir);
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} /* while */
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endmntent(mounts);
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#elif (defined PHYSFS_HAVE_SYS_MNTTAB_H)
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FILE *mounts = fopen(MNTTAB, "r");
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struct mnttab ent;
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BAIL_IF(mounts == NULL, PHYSFS_ERR_IO, /*return void*/);
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while (getmntent(mounts, &ent) == 0)
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{
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int add_it = 0;
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if (strcmp(ent.mnt_fstype, "hsfs") == 0)
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add_it = 1;
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/* add other mount types here */
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if (add_it)
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cb(data, ent.mnt_mountp);
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} /* while */
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fclose(mounts);
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#endif
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} /* __PHYSFS_platformDetectAvailableCDs */
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/*
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* See where program (bin) resides in the $PATH specified by (envr).
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* returns a copy of the first element in envr that contains it, or NULL
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* if it doesn't exist or there were other problems. PHYSFS_SetError() is
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* called if we have a problem.
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*
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* (envr) will be scribbled over, and you are expected to allocator.Free() the
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* return value when you're done with it.
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*/
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static char *findBinaryInPath(const char *bin, char *envr)
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{
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size_t alloc_size = 0;
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char *exe = NULL;
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char *start = envr;
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char *ptr;
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assert(bin != NULL);
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assert(envr != NULL);
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do
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{
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size_t size;
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size_t binlen;
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ptr = strchr(start, ':'); /* find next $PATH separator. */
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if (ptr)
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*ptr = '\0';
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binlen = strlen(bin);
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size = strlen(start) + binlen + 2;
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if (size >= alloc_size)
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{
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char *x = (char *) allocator.Realloc(exe, size);
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if (!x)
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{
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if (exe != NULL)
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allocator.Free(exe);
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BAIL(PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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} /* if */
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alloc_size = size;
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exe = x;
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} /* if */
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/* build full binary path... */
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strcpy(exe, start);
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if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/'))
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strcat(exe, "/");
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strcat(exe, bin);
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if (access(exe, X_OK) == 0) /* Exists as executable? We're done. */
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{
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exe[(size - binlen) - 1] = '\0'; /* chop off filename, leave '/' */
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return exe;
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} /* if */
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start = ptr + 1; /* start points to beginning of next element. */
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} while (ptr != NULL);
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if (exe != NULL)
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allocator.Free(exe);
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return NULL; /* doesn't exist in path. */
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} /* findBinaryInPath */
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static char *readSymLink(const char *path)
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{
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ssize_t len = 64;
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ssize_t rc = -1;
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char *retval = NULL;
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while (1)
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{
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char *ptr = (char *) allocator.Realloc(retval, (size_t) len);
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if (ptr == NULL)
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break; /* out of memory. */
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retval = ptr;
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rc = readlink(path, retval, len);
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if (rc == -1)
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break; /* not a symlink, i/o error, etc. */
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else if (rc < len)
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{
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retval[rc] = '\0'; /* readlink doesn't null-terminate. */
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return retval; /* we're good to go. */
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} /* else if */
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len *= 2; /* grow buffer, try again. */
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} /* while */
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if (retval != NULL)
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allocator.Free(retval);
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return NULL;
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} /* readSymLink */
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char *__PHYSFS_platformCalcBaseDir(const char *argv0)
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{
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char *retval = NULL;
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const char *envr = NULL;
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/* Try to avoid using argv0 unless forced to. Try system-specific stuff. */
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#if defined(PHYSFS_PLATFORM_FREEBSD)
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{
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char fullpath[PATH_MAX];
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size_t buflen = sizeof (fullpath);
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int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
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if (sysctl(mib, 4, fullpath, &buflen, NULL, 0) != -1)
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retval = __PHYSFS_strdup(fullpath);
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}
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#elif defined(PHYSFS_PLATFORM_SOLARIS)
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{
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const char *path = getexecname();
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if ((path != NULL) && (path[0] == '/')) /* must be absolute path... */
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retval = __PHYSFS_strdup(path);
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}
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#endif
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/* If there's a Linux-like /proc filesystem, you can get the full path to
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* the current process from a symlink in there.
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*/
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if (!retval && (access("/proc", F_OK) == 0))
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{
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retval = readSymLink("/proc/self/exe");
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if (!retval) retval = readSymLink("/proc/curproc/file");
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if (!retval) retval = readSymLink("/proc/curproc/exe");
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if (retval == NULL)
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{
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/* older kernels don't have /proc/self ... try PID version... */
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const unsigned long long pid = (unsigned long long) getpid();
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char path[64];
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const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
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if ( (rc > 0) && (rc < sizeof(path)) )
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retval = readSymLink(path);
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} /* if */
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} /* if */
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if (retval != NULL) /* chop off filename. */
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{
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char *ptr = strrchr(retval, '/');
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if (ptr != NULL)
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*(ptr+1) = '\0';
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else /* shouldn't happen, but just in case... */
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{
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allocator.Free(retval);
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retval = NULL;
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} /* else */
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} /* if */
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/* No /proc/self/exe, etc, but we have an argv[0] we can parse? */
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if ((retval == NULL) && (argv0 != NULL))
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{
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/* fast path: default behaviour can handle this. */
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if (strchr(argv0, '/') != NULL)
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return NULL; /* higher level parses out real path from argv0. */
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/* If there's no dirsep on argv0, then look through $PATH for it. */
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envr = getenv("PATH");
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if (envr != NULL)
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{
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char *path = (char *) __PHYSFS_smallAlloc(strlen(envr) + 1);
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BAIL_IF(!path, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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strcpy(path, envr);
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retval = findBinaryInPath(argv0, path);
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__PHYSFS_smallFree(path);
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} /* if */
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} /* if */
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if (retval != NULL)
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{
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/* try to shrink buffer... */
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char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);
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if (ptr != NULL)
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retval = ptr; /* oh well if it failed. */
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} /* if */
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return retval;
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} /* __PHYSFS_platformCalcBaseDir */
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char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)
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{
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/*
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* We use XDG's base directory spec, even if you're not on Linux.
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* This isn't strictly correct, but the results are relatively sane
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* in any case.
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*
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* https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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*/
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const char *envr = getenv("XDG_DATA_HOME");
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const char *append = "/";
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char *retval = NULL;
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size_t len = 0;
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if (!envr)
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{
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/* You end up with "$HOME/.local/share/Game Name 2" */
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envr = __PHYSFS_getUserDir();
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BAIL_IF_ERRPASS(!envr, NULL); /* oh well. */
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append = ".local/share/";
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} /* if */
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len = strlen(envr) + strlen(append) + strlen(app) + 2;
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retval = (char *) allocator.Malloc(len);
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BAIL_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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snprintf(retval, len, "%s%s%s/", envr, append, app);
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return retval;
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} /* __PHYSFS_platformCalcPrefDir */
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#endif /* PHYSFS_PLATFORM_UNIX */
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/* end of physfs_platform_unix.c ... */
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