405 lines
9.6 KiB
C
405 lines
9.6 KiB
C
/*
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* Posix-esque support routines for PhysicsFS.
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*
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* Please see the file LICENSE.txt in the source's root directory.
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*
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* This file written by Ryan C. Gordon.
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*/
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_platforms.h"
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#ifdef PHYSFS_PLATFORM_POSIX
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifdef PHYSFS_HAVE_LLSEEK
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#include <linux/unistd.h>
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#endif
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#include "physfs_internal.h"
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const char *__PHYSFS_platformDirSeparator = "/";
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char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname)
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{
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const char *envr = getenv(varname);
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char *retval = NULL;
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if (envr != NULL)
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{
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retval = (char *) allocator.Malloc(strlen(envr) + 1);
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if (retval != NULL)
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strcpy(retval, envr);
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} /* if */
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return(retval);
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} /* __PHYSFS_platformCopyEnvironmentVariable */
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static char *getUserNameByUID(void)
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{
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uid_t uid = getuid();
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struct passwd *pw;
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char *retval = NULL;
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pw = getpwuid(uid);
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if ((pw != NULL) && (pw->pw_name != NULL))
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{
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retval = (char *) allocator.Malloc(strlen(pw->pw_name) + 1);
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if (retval != NULL)
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strcpy(retval, pw->pw_name);
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} /* if */
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return(retval);
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} /* getUserNameByUID */
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static char *getUserDirByUID(void)
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{
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uid_t uid = getuid();
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struct passwd *pw;
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char *retval = NULL;
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pw = getpwuid(uid);
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if ((pw != NULL) && (pw->pw_dir != NULL))
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{
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retval = (char *) allocator.Malloc(strlen(pw->pw_dir) + 1);
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if (retval != NULL)
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strcpy(retval, pw->pw_dir);
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} /* if */
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return(retval);
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} /* getUserDirByUID */
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char *__PHYSFS_platformGetUserName(void)
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{
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char *retval = getUserNameByUID();
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if (retval == NULL)
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retval = __PHYSFS_platformCopyEnvironmentVariable("USER");
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return(retval);
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} /* __PHYSFS_platformGetUserName */
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char *__PHYSFS_platformGetUserDir(void)
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{
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char *retval = __PHYSFS_platformCopyEnvironmentVariable("HOME");
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if (retval == NULL)
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retval = getUserDirByUID();
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return(retval);
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} /* __PHYSFS_platformGetUserDir */
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int __PHYSFS_platformExists(const char *fname)
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{
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struct stat statbuf;
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BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);
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return(1);
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} /* __PHYSFS_platformExists */
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int __PHYSFS_platformIsSymLink(const char *fname)
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{
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struct stat statbuf;
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BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);
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return( (S_ISLNK(statbuf.st_mode)) ? 1 : 0 );
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} /* __PHYSFS_platformIsSymlink */
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int __PHYSFS_platformIsDirectory(const char *fname)
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{
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struct stat statbuf;
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BAIL_IF_MACRO(stat(fname, &statbuf) == -1, strerror(errno), 0);
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return( (S_ISDIR(statbuf.st_mode)) ? 1 : 0 );
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} /* __PHYSFS_platformIsDirectory */
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char *__PHYSFS_platformCvtToDependent(const char *prepend,
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const char *dirName,
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const char *append)
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{
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int len = ((prepend) ? strlen(prepend) : 0) +
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((append) ? strlen(append) : 0) +
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strlen(dirName) + 1;
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char *retval = (char *) allocator.Malloc(len);
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BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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/* platform-independent notation is Unix-style already. :) */
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if (prepend)
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strcpy(retval, prepend);
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else
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retval[0] = '\0';
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strcat(retval, dirName);
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if (append)
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strcat(retval, append);
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return(retval);
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} /* __PHYSFS_platformCvtToDependent */
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void __PHYSFS_platformEnumerateFiles(const char *dirname,
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int omitSymLinks,
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PHYSFS_EnumFilesCallback callback,
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const char *origdir,
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void *callbackdata)
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{
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DIR *dir;
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struct dirent *ent;
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int bufsize = 0;
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char *buf = NULL;
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int dlen = 0;
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if (omitSymLinks) /* !!! FIXME: this malloc sucks. */
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{
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dlen = strlen(dirname);
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bufsize = dlen + 256;
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buf = (char *) allocator.Malloc(bufsize);
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if (buf == NULL)
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return;
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strcpy(buf, dirname);
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if (buf[dlen - 1] != '/')
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{
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buf[dlen++] = '/';
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buf[dlen] = '\0';
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} /* if */
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} /* if */
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errno = 0;
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dir = opendir(dirname);
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if (dir == NULL)
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{
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allocator.Free(buf);
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return;
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} /* if */
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while ((ent = readdir(dir)) != NULL)
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{
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if (strcmp(ent->d_name, ".") == 0)
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continue;
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if (strcmp(ent->d_name, "..") == 0)
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continue;
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if (omitSymLinks)
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{
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char *p;
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int len = strlen(ent->d_name) + dlen + 1;
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if (len > bufsize)
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{
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p = (char *) allocator.Realloc(buf, len);
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if (p == NULL)
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continue;
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buf = p;
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bufsize = len;
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} /* if */
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strcpy(buf + dlen, ent->d_name);
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if (__PHYSFS_platformIsSymLink(buf))
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continue;
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} /* if */
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callback(callbackdata, origdir, ent->d_name);
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} /* while */
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allocator.Free(buf);
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closedir(dir);
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} /* __PHYSFS_platformEnumerateFiles */
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int __PHYSFS_platformMkDir(const char *path)
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{
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int rc;
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errno = 0;
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rc = mkdir(path, S_IRWXU);
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BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
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return(1);
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} /* __PHYSFS_platformMkDir */
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static void *doOpen(const char *filename, int mode)
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{
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int fd;
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int *retval;
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errno = 0;
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fd = open(filename, mode, S_IRUSR | S_IWUSR);
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BAIL_IF_MACRO(fd < 0, strerror(errno), NULL);
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retval = (int *) allocator.Malloc(sizeof (int));
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if (retval == NULL)
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{
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close(fd);
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BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
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} /* if */
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*retval = fd;
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return((void *) retval);
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} /* doOpen */
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void *__PHYSFS_platformOpenRead(const char *filename)
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{
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return(doOpen(filename, O_RDONLY));
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} /* __PHYSFS_platformOpenRead */
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void *__PHYSFS_platformOpenWrite(const char *filename)
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{
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return(doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC));
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} /* __PHYSFS_platformOpenWrite */
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void *__PHYSFS_platformOpenAppend(const char *filename)
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{
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return(doOpen(filename, O_WRONLY | O_CREAT | O_APPEND));
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} /* __PHYSFS_platformOpenAppend */
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PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
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PHYSFS_uint32 size, PHYSFS_uint32 count)
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{
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int fd = *((int *) opaque);
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int max = size * count;
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int rc = read(fd, buffer, max);
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if (size == 0)
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return 0;
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if (count == 0)
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return 0;
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BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
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assert(rc <= max);
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if ((rc < max) && (size > 1))
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lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
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return (rc / size);
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} /* __PHYSFS_platformRead */
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PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
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PHYSFS_uint32 size, PHYSFS_uint32 count)
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{
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int fd = *((int *) opaque);
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int max = size * count;
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int rc = write(fd, (void *) buffer, max);
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BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
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assert(rc <= max);
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if ((rc < max) && (size > 1))
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lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
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return(rc / size);
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} /* __PHYSFS_platformWrite */
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int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
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{
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int fd = *((int *) opaque);
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#ifdef PHYSFS_HAVE_LLSEEK
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unsigned long offset_high = ((pos >> 32) & 0xFFFFFFFF);
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unsigned long offset_low = (pos & 0xFFFFFFFF);
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loff_t retoffset;
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int rc = llseek(fd, offset_high, offset_low, &retoffset, SEEK_SET);
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BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
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#else
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BAIL_IF_MACRO(lseek(fd, (int) pos, SEEK_SET) == -1, strerror(errno), 0);
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#endif
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return(1);
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} /* __PHYSFS_platformSeek */
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PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
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{
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int fd = *((int *) opaque);
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PHYSFS_sint64 retval;
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#ifdef PHYSFS_HAVE_LLSEEK
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loff_t retoffset;
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int rc = llseek(fd, 0, &retoffset, SEEK_CUR);
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BAIL_IF_MACRO(rc == -1, strerror(errno), -1);
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retval = (PHYSFS_sint64) retoffset;
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#else
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retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR);
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BAIL_IF_MACRO(retval == -1, strerror(errno), -1);
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#endif
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return(retval);
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} /* __PHYSFS_platformTell */
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PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
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{
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int fd = *((int *) opaque);
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struct stat statbuf;
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BAIL_IF_MACRO(fstat(fd, &statbuf) == -1, strerror(errno), -1);
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return((PHYSFS_sint64) statbuf.st_size);
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} /* __PHYSFS_platformFileLength */
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int __PHYSFS_platformEOF(void *opaque)
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{
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PHYSFS_sint64 pos = __PHYSFS_platformTell(opaque);
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PHYSFS_sint64 len = __PHYSFS_platformFileLength(opaque);
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return(pos >= len);
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} /* __PHYSFS_platformEOF */
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int __PHYSFS_platformFlush(void *opaque)
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{
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int fd = *((int *) opaque);
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BAIL_IF_MACRO(fsync(fd) == -1, strerror(errno), 0);
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return(1);
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} /* __PHYSFS_platformFlush */
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int __PHYSFS_platformClose(void *opaque)
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{
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int fd = *((int *) opaque);
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BAIL_IF_MACRO(close(fd) == -1, strerror(errno), 0);
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allocator.Free(opaque);
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return(1);
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} /* __PHYSFS_platformClose */
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int __PHYSFS_platformDelete(const char *path)
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{
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BAIL_IF_MACRO(remove(path) == -1, strerror(errno), 0);
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return(1);
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} /* __PHYSFS_platformDelete */
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PHYSFS_sint64 __PHYSFS_platformGetLastModTime(const char *fname)
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{
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struct stat statbuf;
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BAIL_IF_MACRO(stat(fname, &statbuf) < 0, strerror(errno), -1);
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return statbuf.st_mtime;
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} /* __PHYSFS_platformGetLastModTime */
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#endif /* PHYSFS_PLATFORM_POSIX */
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/* end of posix.c ... */
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