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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 (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>
#include <mntent.h>
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
const char *__PHYSFS_platformDirSeparator = "/";
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;
*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;
/* !!! other mount types? */
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_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 (exe[strlen(exe) - 1] != '/')
strcat(exe, "/");
strcat(exe, 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 */
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 */
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 */
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 */
/* end of unix.c ... */
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