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physfs/platform/unix.c

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/*
* Unix support routines for PhysicsFS.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if ((defined __APPLE__) && (defined __MACH__))
# if (!defined __DARWIN__)
# define __DARWIN__
# endif
#endif
#if (defined __STRICT_ANSI__)
#define __PHYSFS_DOING_STRICT_ANSI__
#endif
/*
* We cheat a little: I want the symlink version of stat() (lstat), and
* GCC/Linux will not declare it if compiled with the -ansi flag.
* If you are really lacking symlink support on your platform,
* you should #define __PHYSFS_NO_SYMLINKS__ before compiling this
* file. That will open a security hole, though, if you really DO have
* symlinks on your platform; it renders PHYSFS_permitSymbolicLinks(0)
* useless, since every symlink will be reported as a regular file/dir.
*/
#if (defined __PHYSFS_DOING_STRICT_ANSI__)
#undef __STRICT_ANSI__
#endif
#include <stdio.h>
#if (defined __PHYSFS_DOING_STRICT_ANSI__)
#define __STRICT_ANSI__
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <pthread.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>
#if (!defined __DARWIN__)
#include <mntent.h>
#else
#include <sys/ucred.h>
#endif
#include <sys/mount.h>
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
const char *__PHYSFS_platformDirSeparator = "/";
int __PHYSFS_platformInit(void)
{
return(1); /* always succeed. */
} /* __PHYSFS_platformInit */
int __PHYSFS_platformDeinit(void)
{
return(1); /* always succeed. */
} /* __PHYSFS_platformDeinit */
#if (defined __DARWIN__)
char **__PHYSFS_platformDetectAvailableCDs(void)
{
char **retval = (char **) malloc(sizeof (char *));
int cd_count = 1; /* We count the NULL entry. */
struct statfs* mntbufp = NULL;
int mounts;
int ii;
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
mounts = getmntinfo( &mntbufp, MNT_WAIT );
for ( ii=0; ii < mounts; ++ii ) {
int add_it = 0;
if ( strcmp( mntbufp[ii].f_fstypename, "iso9660") == 0 )
add_it = 1;
else if ( strcmp( mntbufp[ii].f_fstypename, "cd9660") == 0 )
add_it = 1;
/* add other mount types here */
if (add_it)
{
char **tmp = realloc(retval, sizeof (char *) * cd_count + 1);
if (tmp)
{
retval = tmp;
retval[cd_count-1] = (char *)
malloc(strlen(mntbufp[ ii ].f_mntonname) + 1);
if (retval[cd_count-1])
{
strcpy(retval[cd_count-1], mntbufp[ ii ].f_mntonname);
cd_count++;
} /* if */
} /* if */
} /* if */
}
free( mntbufp );
retval[cd_count - 1] = NULL;
return(retval);
} /* __PHYSFS_platformDetectAvailableCDs */
#else /* non-Darwin implementation... */
char **__PHYSFS_platformDetectAvailableCDs(void)
{
char **retval = (char **) malloc(sizeof (char *));
int cd_count = 1; /* We count the NULL entry. */
FILE *mounts = NULL;
struct mntent *ent = NULL;
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
*retval = NULL;
mounts = setmntent("/etc/mtab", "r");
BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, retval);
while ( (ent = getmntent(mounts)) != NULL )
{
int add_it = 0;
if (strcmp(ent->mnt_type, "iso9660") == 0)
add_it = 1;
/* add other mount types here */
if (add_it)
{
char **tmp = realloc(retval, sizeof (char *) * cd_count + 1);
if (tmp)
{
retval = tmp;
retval[cd_count-1] = (char *) malloc(strlen(ent->mnt_dir) + 1);
if (retval[cd_count-1])
{
strcpy(retval[cd_count-1], ent->mnt_dir);
cd_count++;
} /* if */
} /* if */
} /* if */
} /* while */
endmntent(mounts);
retval[cd_count - 1] = NULL;
return(retval);
} /* __PHYSFS_platformDetectAvailableCDs */
#endif
static char *copyEnvironmentVariable(const char *varname)
{
const char *envr = getenv(varname);
char *retval = NULL;
if (envr != NULL)
{
retval = malloc(strlen(envr) + 1);
if (retval != NULL)
strcpy(retval, envr);
} /* if */
return(retval);
} /* copyEnvironmentVariable */
/*
* 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 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 *) realloc(exe, size);
if (x == NULL)
{
if (exe != NULL)
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[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)
free(exe);
return(NULL); /* doesn't exist in path. */
} /* findBinaryInPath */
char *__PHYSFS_platformCalcBaseDir(const char *argv0)
{
/* If there isn't a path on argv0, then look through the $PATH for it. */
char *retval;
char *envr;
if (strchr(argv0, '/') != NULL) /* default behaviour can handle this. */
return(NULL);
envr = copyEnvironmentVariable("PATH");
BAIL_IF_MACRO(!envr, NULL, NULL);
retval = findBinaryInPath(argv0, envr);
free(envr);
return(retval);
} /* __PHYSFS_platformCalcBaseDir */
static char *getUserNameByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_name != NULL))
{
retval = malloc(strlen(pw->pw_name) + 1);
if (retval != NULL)
strcpy(retval, pw->pw_name);
} /* if */
return(retval);
} /* getUserNameByUID */
static char *getUserDirByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_dir != NULL))
{
retval = malloc(strlen(pw->pw_dir) + 1);
if (retval != NULL)
strcpy(retval, pw->pw_dir);
} /* if */
return(retval);
} /* getUserDirByUID */
char *__PHYSFS_platformGetUserName(void)
{
char *retval = getUserNameByUID();
if (retval == NULL)
retval = copyEnvironmentVariable("USER");
return(retval);
} /* __PHYSFS_platformGetUserName */
char *__PHYSFS_platformGetUserDir(void)
{
char *retval = copyEnvironmentVariable("HOME");
if (retval == NULL)
retval = getUserDirByUID();
return(retval);
} /* __PHYSFS_platformGetUserDir */
PHYSFS_uint64 __PHYSFS_platformGetThreadID(void)
{
return((PHYSFS_uint64) ((PHYSFS_uint32) pthread_self()));
} /* __PHYSFS_platformGetThreadID */
/* -ansi and -pedantic flags prevent use of strcasecmp() on Linux. */
int __PHYSFS_platformStricmp(const char *x, const char *y)
{
int ux, uy;
do
{
ux = toupper((int) *x);
uy = toupper((int) *y);
if (ux > uy)
return(1);
else if (ux < uy)
return(-1);
x++;
y++;
} while ((ux) && (uy));
return(0);
} /* __PHYSFS_platformStricmp */
int __PHYSFS_platformExists(const char *fname)
{
struct stat statbuf;
return(stat(fname, &statbuf) == 0);
} /* __PHYSFS_platformExists */
int __PHYSFS_platformIsSymLink(const char *fname)
{
#if (defined __PHYSFS_NO_SYMLINKS__)
return(0);
#else
struct stat statbuf;
int retval = 0;
if (lstat(fname, &statbuf) == 0)
{
if (S_ISLNK(statbuf.st_mode))
retval = 1;
} /* if */
return(retval);
#endif
} /* __PHYSFS_platformIsSymlink */
int __PHYSFS_platformIsDirectory(const char *fname)
{
struct stat statbuf;
int retval = 0;
if (stat(fname, &statbuf) == 0)
{
if (S_ISDIR(statbuf.st_mode))
retval = 1;
} /* if */
return(retval);
} /* __PHYSFS_platformIsDirectory */
char *__PHYSFS_platformCvtToDependent(const char *prepend,
const char *dirName,
const char *append)
{
int len = ((prepend) ? strlen(prepend) : 0) +
((append) ? strlen(append) : 0) +
strlen(dirName) + 1;
char *retval = malloc(len);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
/* platform-independent notation is Unix-style already. :) */
if (prepend)
strcpy(retval, prepend);
else
retval[0] = '\0';
strcat(retval, dirName);
if (append)
strcat(retval, append);
return(retval);
} /* __PHYSFS_platformCvtToDependent */
/* Much like my college days, try to sleep for 10 milliseconds at a time... */
void __PHYSFS_platformTimeslice(void)
{
usleep( 10 * 1000 ); /* don't care if it fails. */
} /* __PHYSFS_platformTimeslice */
LinkedStringList *__PHYSFS_platformEnumerateFiles(const char *dirname,
int omitSymLinks)
{
LinkedStringList *retval = NULL;
LinkedStringList *l = NULL;
LinkedStringList *prev = NULL;
DIR *dir;
struct dirent *ent;
int bufsize = 0;
char *buf = NULL;
int dlen = 0;
if (omitSymLinks)
{
dlen = strlen(dirname);
bufsize = dlen + 256;
buf = malloc(bufsize);
BAIL_IF_MACRO(buf == NULL, ERR_OUT_OF_MEMORY, NULL);
strcpy(buf, dirname);
if (buf[dlen - 1] != '/')
{
buf[dlen++] = '/';
buf[dlen] = '\0';
} /* if */
} /* if */
errno = 0;
dir = opendir(dirname);
if (dir == NULL)
{
if (buf != NULL)
free(buf);
BAIL_IF_MACRO(1, strerror(errno), NULL);
} /* if */
while (1)
{
ent = readdir(dir);
if (ent == NULL) /* we're done. */
break;
if (strcmp(ent->d_name, ".") == 0)
continue;
if (strcmp(ent->d_name, "..") == 0)
continue;
if (omitSymLinks)
{
char *p;
int len = strlen(ent->d_name) + dlen + 1;
if (len > bufsize)
{
p = realloc(buf, len);
if (p == NULL)
continue;
buf = p;
bufsize = len;
} /* if */
strcpy(buf + dlen, ent->d_name);
if (__PHYSFS_platformIsSymLink(buf))
continue;
} /* if */
l = (LinkedStringList *) malloc(sizeof (LinkedStringList));
if (l == NULL)
break;
l->str = (char *) malloc(strlen(ent->d_name) + 1);
if (l->str == NULL)
{
free(l);
break;
} /* if */
strcpy(l->str, ent->d_name);
if (retval == NULL)
retval = l;
else
prev->next = l;
prev = l;
l->next = NULL;
} /* while */
if (buf != NULL)
free(buf);
closedir(dir);
return(retval);
} /* __PHYSFS_platformEnumerateFiles */
char *__PHYSFS_platformCurrentDir(void)
{
int allocSize = 0;
char *retval = NULL;
char *ptr;
do
{
allocSize += 100;
ptr = (char *) realloc(retval, allocSize);
if (ptr == NULL)
{
if (retval != NULL)
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)
free(retval);
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* if */
return(retval);
} /* __PHYSFS_platformCurrentDir */
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 = malloc(strlen(resolved_path) + 1);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
strcpy(retval, resolved_path);
return(retval);
} /* __PHYSFS_platformRealPath */
int __PHYSFS_platformMkDir(const char *path)
{
int rc;
errno = 0;
rc = mkdir(path, S_IRWXU);
BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformMkDir */
static void *doOpen(const char *filename, const char *mode)
{
FILE *retval;
errno = 0;
retval = fopen(filename, mode);
if (retval == NULL)
__PHYSFS_setError(strerror(errno));
return((void *) retval);
} /* doOpen */
void *__PHYSFS_platformOpenRead(const char *filename)
{
return(doOpen(filename, "rb"));
} /* __PHYSFS_platformOpenRead */
void *__PHYSFS_platformOpenWrite(const char *filename)
{
return(doOpen(filename, "wb"));
} /* __PHYSFS_platformOpenWrite */
void *__PHYSFS_platformOpenAppend(const char *filename)
{
return(doOpen(filename, "ab"));
} /* __PHYSFS_platformOpenAppend */
PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
FILE *io = (FILE *) opaque;
int rc = fread(buffer, size, count, io);
if (rc < count)
{
int err = errno;
BAIL_IF_MACRO(ferror(io), strerror(err), rc);
BAIL_MACRO(ERR_PAST_EOF, rc);
} /* if */
return(rc);
} /* __PHYSFS_platformRead */
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
FILE *io = (FILE *) opaque;
int rc = fwrite((void *) buffer, size, count, io);
if (rc < count)
__PHYSFS_setError(strerror(errno));
return(rc);
} /* __PHYSFS_platformWrite */
int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
{
FILE *io = (FILE *) opaque;
/* !!! FIXME: Use llseek where available. */
errno = 0;
BAIL_IF_MACRO(fseek(io, pos, SEEK_SET) != 0, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformSeek */
PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
{
FILE *io = (FILE *) opaque;
PHYSFS_sint64 retval = ftell(io);
BAIL_IF_MACRO(retval == -1, strerror(errno), -1);
return(retval);
} /* __PHYSFS_platformTell */
PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
{
FILE *io = (FILE *) opaque;
struct stat statbuf;
errno = 0;
BAIL_IF_MACRO(fstat(fileno(io), &statbuf) == -1, strerror(errno), -1);
return((PHYSFS_sint64) statbuf.st_size);
} /* __PHYSFS_platformFileLength */
int __PHYSFS_platformEOF(void *opaque)
{
return(feof((FILE *) opaque));
} /* __PHYSFS_platformEOF */
int __PHYSFS_platformFlush(void *opaque)
{
errno = 0;
BAIL_IF_MACRO(fflush((FILE *) opaque) == EOF, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformFlush */
int __PHYSFS_platformClose(void *opaque)
{
errno = 0;
BAIL_IF_MACRO(fclose((FILE *) opaque) == EOF, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformClose */
int __PHYSFS_platformDelete(const char *path)
{
errno = 0;
BAIL_IF_MACRO(remove(path) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformDelete */
void *__PHYSFS_platformCreateMutex(void)
{
int rc;
pthread_mutex_t *m = (pthread_mutex_t *) malloc(sizeof (pthread_mutex_t));
BAIL_IF_MACRO(m == NULL, ERR_OUT_OF_MEMORY, NULL);
rc = pthread_mutex_init(m, NULL);
if (rc != 0)
{
free(m);
BAIL_MACRO(strerror(rc), NULL);
} /* if */
return((void *) m);
} /* __PHYSFS_platformCreateMutex */
void __PHYSFS_platformDestroyMutex(void *mutex)
{
pthread_mutex_destroy((pthread_mutex_t *) mutex);
free(mutex);
} /* __PHYSFS_platformDestroyMutex */
int __PHYSFS_platformGrabMutex(void *mutex)
{
return(pthread_mutex_lock((pthread_mutex_t *) mutex) == 0);
} /* __PHYSFS_platformGrabMutex */
void __PHYSFS_platformReleaseMutex(void *mutex)
{
pthread_mutex_unlock((pthread_mutex_t *) mutex);
} /* __PHYSFS_platformReleaseMutex */
/* end of unix.c ... */
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