/*

* Unix support routines for PhysicsFS.

*

* Please see the file LICENSE in the source's root directory.

*

* This file written by Ryan C. Gordon.

*/

#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

#if (defined __PHYSFS_DOING_STRICT_ANSI__)

#define __STRICT_ANSI__

#endif

#include <string.h>

#include <ctype.h>

#include <unistd.h>

#include <sys/types.h>

#include <pwd.h>

#include <sys/stat.h>

#include <dirent.h>

#include <time.h>

#include <errno.h>

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

const char *__PHYSFS_platformDirSeparator = "/";

char **__PHYSFS_platformDetectAvailableCDs(void)

{

/* !!! write me. */

char **retval = malloc(sizeof (char *));

if (retval != NULL)

*retval = NULL;

return(retval);

} /* __PHYSFS_detectAvailableCDs */

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 */

/* !!! this is ugly. */

char *__PHYSFS_platformCalcBaseDir(const char *argv0)

{

/* If there isn't a path on argv0, then look through the $PATH for it. */

char *retval = NULL;

char *envr;

char *start;

char *ptr;

char *exe;

if (strchr(argv0, '/') != NULL) /* default behaviour can handle this. */

return(NULL);

envr = copyEnvironmentVariable("PATH");

BAIL_IF_MACRO(!envr, NULL, NULL);

start = envr;

do

{

ptr = strchr(start, ':');

if (ptr)

*ptr = '\0';

exe = (char *) malloc(strlen(start) + strlen(argv0) + 2);

if (!exe)

{

free(envr);

BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);

} /* if */

strcpy(exe, start);

if (start[strlen(start) - 1] != '/')

strcat(start, "/");

strcat(start, argv0);

if (access(exe, X_OK) != 0)

free(exe);

else

{

retval = exe;

strcpy(retval, start); /* i'm lazy. piss off. */

break;

} /* else */

start = ptr + 1;

} while (ptr != NULL);

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 */

int __PHYSFS_platformGetThreadID(void)

{

return((int) 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)

{

struct timespec napTime;

napTime.tv_sec = 0;

napTime.tv_nsec = 10 * 1000 * 1000; /* specified in nanoseconds. */

nanosleep(&napTime, NULL); /* 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 */

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 */

closedir(dir);

return(retval);

} /* __PHYSFS_platformEnumerateFiles */

int __PHYSFS_platformFileLength(FILE *handle)

{

struct stat statbuf;

errno = 0;

BAIL_IF_MACRO(fstat(fileno(handle), &statbuf) == -1, strerror(errno), -1);

return(statbuf.st_size);

} /* __PHYSFS_platformFileLength */

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_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);

} /* if */

retval = ptr;

ptr = getcwd(retval, allocSize);

} while (ptr == NULL);

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 */