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physfs/platform/posix.c

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/*
* Posix-esque 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 __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 <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <assert.h>
#ifdef PHYSFS_HAVE_LLSEEK
#include <linux/unistd.h>
#endif
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname)
{
const char *envr = getenv(varname);
char *retval = NULL;
if (envr != NULL)
{
retval = (char *) malloc(strlen(envr) + 1);
if (retval != NULL)
strcpy(retval, envr);
} /* if */
return(retval);
} /* __PHYSFS_platformCopyEnvironmentVariable */
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 = (char *) 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 = (char *) 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 = __PHYSFS_platformCopyEnvironmentVariable("USER");
return(retval);
} /* __PHYSFS_platformGetUserName */
char *__PHYSFS_platformGetUserDir(void)
{
char *retval = __PHYSFS_platformCopyEnvironmentVariable("HOME");
if (retval == NULL)
retval = getUserDirByUID();
return(retval);
} /* __PHYSFS_platformGetUserDir */
/* -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 = (char *) 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 */
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 = (char *) 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 */
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, int mode)
{
int fd;
int *retval;
errno = 0;
fd = open(filename, mode, S_IRUSR | S_IWUSR);
if (fd < 0)
__PHYSFS_setError(strerror(errno));
retval = (int *) malloc(sizeof (int));
if (retval == NULL)
{
close(fd);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
*retval = fd;
return((void *) retval);
} /* doOpen */
void *__PHYSFS_platformOpenRead(const char *filename)
{
return(doOpen(filename, O_RDONLY));
} /* __PHYSFS_platformOpenRead */
void *__PHYSFS_platformOpenWrite(const char *filename)
{
return(doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC));
} /* __PHYSFS_platformOpenWrite */
void *__PHYSFS_platformOpenAppend(const char *filename)
{
return(doOpen(filename, O_WRONLY | O_CREAT | O_APPEND));
} /* __PHYSFS_platformOpenAppend */
PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
int fd = *((int *) opaque);
int max = size * count;
int rc = read(fd, buffer, max);
BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
assert(rc <= max);
if ((rc < max) && (size > 1))
lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
return(rc / size);
} /* __PHYSFS_platformRead */
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
int fd = *((int *) opaque);
int max = size * count;
int rc = write(fd, (void *) buffer, max);
BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
assert(rc <= max);
if ((rc < max) && (size > 1))
lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
return(rc / size);
} /* __PHYSFS_platformWrite */
int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
{
int fd = *((int *) opaque);
#ifdef PHYSFS_HAVE_LLSEEK
unsigned long offset_high = ((pos >> 32) & 0xFFFFFFFF);
unsigned long offset_low = (pos & 0xFFFFFFFF);
loff_t retoffset;
int rc = llseek(fd, offset_high, offset_low, &retoffset, SEEK_SET);
BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
#else
BAIL_IF_MACRO(lseek(fd, (int) pos, SEEK_SET) == -1, strerror(errno), 0);
#endif
return(1);
} /* __PHYSFS_platformSeek */
PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
{
int fd = *((int *) opaque);
PHYSFS_sint64 retval;
#ifdef PHYSFS_HAVE_LLSEEK
loff_t retoffset;
int rc = llseek(fd, 0, &retoffset, SEEK_CUR);
BAIL_IF_MACRO(rc == -1, strerror(errno), -1);
retval = (PHYSFS_sint64) retoffset;
#else
retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR);
BAIL_IF_MACRO(retval == -1, strerror(errno), -1);
#endif
return(retval);
} /* __PHYSFS_platformTell */
PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
{
int fd = *((int *) opaque);
struct stat statbuf;
BAIL_IF_MACRO(fstat(fd, &statbuf) == -1, strerror(errno), -1);
return((PHYSFS_sint64) statbuf.st_size);
} /* __PHYSFS_platformFileLength */
int __PHYSFS_platformEOF(void *opaque)
{
PHYSFS_sint64 pos = __PHYSFS_platformTell(opaque);
PHYSFS_sint64 len = __PHYSFS_platformFileLength(opaque);
return(pos >= len);
} /* __PHYSFS_platformEOF */
int __PHYSFS_platformFlush(void *opaque)
{
int fd = *((int *) opaque);
BAIL_IF_MACRO(fsync(fd) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformFlush */
int __PHYSFS_platformClose(void *opaque)
{
int fd = *((int *) opaque);
BAIL_IF_MACRO(close(fd) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformClose */
int __PHYSFS_platformDelete(const char *path)
{
BAIL_IF_MACRO(remove(path) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformDelete */
PHYSFS_sint64 __PHYSFS_platformGetLastModTime(const char *fname)
{
struct stat statbuf;
BAIL_IF_MACRO(stat(fname, &statbuf) < 0, strerror(errno), -1);
return statbuf.st_mtime;
} /* __PHYSFS_platformGetLastModTime */
/* end of posix.c ... */
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