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physfs/src/platform_unix.c

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/*
* Unix support routines for PhysicsFS.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_platforms.h"
#ifdef PHYSFS_PLATFORM_UNIX
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <dirent.h>
#include <time.h>
#include <errno.h>
#ifdef PHYSFS_HAVE_SYS_UCRED_H
# ifdef PHYSFS_HAVE_MNTENT_H
# undef PHYSFS_HAVE_MNTENT_H /* don't do both... */
# endif
# include <sys/mount.h>
# include <sys/ucred.h>
#endif
#ifdef PHYSFS_HAVE_MNTENT_H
#include <mntent.h>
#endif
#ifdef PHYSFS_HAVE_SYS_MNTTAB_H
#include <sys/mnttab.h>
#endif
#include "physfs_internal.h"
/* !!! FIXME: we should probably remove MAXPATHLEN entirely, if we can. */
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
int __PHYSFS_platformInit(void)
{
return 1; /* always succeed. */
} /* __PHYSFS_platformInit */
int __PHYSFS_platformDeinit(void)
{
return 1; /* always succeed. */
} /* __PHYSFS_platformDeinit */
/* Stub version for platforms without CD-ROM support. */
void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
{
#if (defined PHYSFS_NO_CDROM_SUPPORT)
/* no-op. */
#elif (defined PHYSFS_HAVE_SYS_UCRED_H)
int i;
struct statfs *mntbufp = NULL;
int mounts = getmntinfo(&mntbufp, MNT_WAIT);
for (i = 0; i < mounts; i++)
{
int add_it = 0;
if (strcmp(mntbufp[i].f_fstypename, "iso9660") == 0)
add_it = 1;
else if (strcmp( mntbufp[i].f_fstypename, "cd9660") == 0)
add_it = 1;
/* add other mount types here */
if (add_it)
cb(data, mntbufp[i].f_mntonname);
} /* for */
#elif (defined PHYSFS_HAVE_MNTENT_H)
FILE *mounts = NULL;
struct mntent *ent = NULL;
mounts = setmntent("/etc/mtab", "r");
BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, /*return void*/);
while ( (ent = getmntent(mounts)) != NULL )
{
int add_it = 0;
if (strcmp(ent->mnt_type, "iso9660") == 0)
add_it = 1;
else if (strcmp(ent->mnt_type, "udf") == 0)
add_it = 1;
/* !!! FIXME: these might pick up floppy drives, right? */
else if (strcmp(ent->mnt_type, "auto") == 0)
add_it = 1;
else if (strcmp(ent->mnt_type, "supermount") == 0)
add_it = 1;
/* !!! FIXME: udf? automount? */
/* add other mount types here */
if (add_it)
cb(data, ent->mnt_dir);
} /* while */
endmntent(mounts);
#elif (defined PHYSFS_HAVE_SYS_MNTTAB_H)
FILE *mounts = fopen(MNTTAB, "r");
struct mnttab ent;
BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, /*return void*/);
while (getmntent(mounts, &ent) == 0)
{
int add_it = 0;
if (strcmp(ent.mnt_fstype, "hsfs") == 0)
add_it = 1;
/* add other mount types here */
if (add_it)
cb(data, ent.mnt_mountp);
} /* while */
fclose(mounts);
#else
#error Unknown platform. Should have defined PHYSFS_NO_CDROM_SUPPORT, perhaps.
#endif
} /* __PHYSFS_platformDetectAvailableCDs */
/* this is in posix.c ... */
extern char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname);
/*
* See where program (bin) resides in the $PATH specified by (envr).
* returns a copy of the first element in envr that contains it, or NULL
* if it doesn't exist or there were other problems. PHYSFS_SetError() is
* called if we have a problem.
*
* (envr) will be scribbled over, and you are expected to allocator.Free() the
* return value when you're done with it.
*/
static char *findBinaryInPath(const char *bin, char *envr)
{
size_t alloc_size = 0;
char *exe = NULL;
char *start = envr;
char *ptr;
BAIL_IF_MACRO(bin == NULL, ERR_INVALID_ARGUMENT, NULL);
BAIL_IF_MACRO(envr == NULL, ERR_INVALID_ARGUMENT, NULL);
do
{
size_t size;
ptr = strchr(start, ':'); /* find next $PATH separator. */
if (ptr)
*ptr = '\0';
size = strlen(start) + strlen(bin) + 2;
if (size > alloc_size)
{
char *x = (char *) allocator.Realloc(exe, size);
if (x == NULL)
{
if (exe != NULL)
allocator.Free(exe);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
alloc_size = size;
exe = x;
} /* if */
/* build full binary path... */
strcpy(exe, start);
if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/'))
strcat(exe, "/");
strcat(exe, bin);
if (access(exe, X_OK) == 0) /* Exists as executable? We're done. */
{
strcpy(exe, start); /* i'm lazy. piss off. */
return exe;
} /* if */
start = ptr + 1; /* start points to beginning of next element. */
} while (ptr != NULL);
if (exe != NULL)
allocator.Free(exe);
return NULL; /* doesn't exist in path. */
} /* findBinaryInPath */
static char *readSymLink(const char *path)
{
ssize_t len = 64;
ssize_t rc = -1;
char *retval = NULL;
while (1)
{
char *ptr = (char *) allocator.Realloc(retval, (size_t) len);
if (ptr == NULL)
break; /* out of memory. */
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. */
} /* else if */
len *= 2; /* grow buffer, try again. */
} /* while */
if (retval != NULL)
allocator.Free(retval);
return NULL;
} /* readSymLink */
char *__PHYSFS_platformCalcBaseDir(const char *argv0)
{
char *retval = NULL;
char *envr = NULL;
/* fast path: default behaviour can handle this. */
if ( (argv0 != NULL) && (strchr(argv0, '/') != NULL) )
return NULL; /* higher level will parse out real path from argv0. */
/*
* Try to avoid using argv0 unless forced to. If there's a Linux-like
* /proc filesystem, you can get the full path to the current process from
* the /proc/self/exe symlink.
*/
retval = readSymLink("/proc/self/exe");
if (retval == NULL)
{
/* older kernels don't have /proc/self ... try PID version... */
const unsigned long long pid = (unsigned long long) getpid();
char path[64];
const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
if ( (rc > 0) && (rc < sizeof(path)) )
retval = readSymLink(path);
} /* if */
if (retval != NULL) /* chop off filename. */
{
char *ptr = strrchr(retval, '/');
if (ptr != NULL)
*ptr = '\0';
} /* if */
if ((retval == NULL) && (argv0 != NULL))
{
/* If there's no dirsep on argv0, then look through $PATH for it. */
envr = __PHYSFS_platformCopyEnvironmentVariable("PATH");
BAIL_IF_MACRO(!envr, NULL, NULL);
retval = findBinaryInPath(argv0, envr);
allocator.Free(envr);
} /* if */
if (retval != NULL)
{
/* try to shrink buffer... */
char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);
if (ptr != NULL)
retval = ptr; /* oh well if it failed. */
} /* if */
return retval;
} /* __PHYSFS_platformCalcBaseDir */
char *__PHYSFS_platformRealPath(const char *path)
{
char resolved_path[MAXPATHLEN];
char *retval = NULL;
errno = 0;
BAIL_IF_MACRO(!realpath(path, resolved_path), strerror(errno), NULL);
retval = (char *) allocator.Malloc(strlen(resolved_path) + 1);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
strcpy(retval, resolved_path);
return retval;
} /* __PHYSFS_platformRealPath */
char *__PHYSFS_platformCurrentDir(void)
{
/*
* This can't just do platformRealPath("."), since that would eventually
* just end up calling back into here.
*/
int allocSize = 0;
char *retval = NULL;
char *ptr;
do
{
allocSize += 100;
ptr = (char *) allocator.Realloc(retval, allocSize);
if (ptr == NULL)
{
if (retval != NULL)
allocator.Free(retval);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
retval = ptr;
ptr = getcwd(retval, allocSize);
} while (ptr == NULL && errno == ERANGE);
if (ptr == NULL && errno)
{
/*
* getcwd() failed for some reason, for example current
* directory not existing.
*/
if (retval != NULL)
allocator.Free(retval);
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* if */
return retval;
} /* __PHYSFS_platformCurrentDir */
int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)
{
return 0; /* just use malloc() and friends. */
} /* __PHYSFS_platformSetDefaultAllocator */
#endif /* PHYSFS_PLATFORM_UNIX */
/* end of unix.c ... */
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