platform/posix.c
author Ryan C. Gordon <icculus@icculus.org>
Sat, 24 Mar 2007 03:54:58 +0000
changeset 852 9467e96abdf1
parent 847 5e5e6c067413
child 939 684c583cb586
permissions -rw-r--r--
Replaced some Malloc and all the alloca() calls with __PHYSFS_smallAlloc(), which will stack allocate small (128 or less bytes) blocks and Malloc the rest...naturally these now have to be paired with __PHYSFS_smallFree() calls, so you can't be as lazy as a basic alloca() would let you be. The benefit is both less malloc pressure for those temporary allocations and better stack overflow safety (so if some jerk tries to push a 78 megabyte string through the library as a filename, we won't try to strcpy it to the stack).
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/*
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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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   159
                                     int omitSymLinks,
754
e7cd7411eadf API BREAKAGE: Changed PHYSFS_enumerateFilesCallback() to pass the originally
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   160
                                     PHYSFS_EnumFilesCallback callback,
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   161
                                     const char *origdir,
657
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                                     void *callbackdata)
235
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{
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   164
    DIR *dir;
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   165
    struct dirent *ent;
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parents:
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   166
    int bufsize = 0;
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diff changeset
   167
    char *buf = NULL;
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    int dlen = 0;
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diff changeset
   169
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    if (omitSymLinks)  /* !!! FIXME: this malloc sucks. */
235
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   171
    {
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        dlen = strlen(dirname);
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        bufsize = dlen + 256;
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   174
        buf = (char *) allocator.Malloc(bufsize);
657
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        if (buf == NULL)
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   176
            return;
235
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   177
        strcpy(buf, dirname);
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   178
        if (buf[dlen - 1] != '/')
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   179
        {
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            buf[dlen++] = '/';
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   181
            buf[dlen] = '\0';
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   182
        } /* if */
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   183
    } /* if */
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   185
    errno = 0;
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   186
    dir = opendir(dirname);
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   187
    if (dir == NULL)
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   188
    {
852
9467e96abdf1 Replaced some Malloc and all the alloca() calls with __PHYSFS_smallAlloc(),
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   189
        allocator.Free(buf);
657
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   190
        return;
235
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diff changeset
   191
    } /* if */
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diff changeset
   192
362
ac8c846a0a66 Changed enumeration code to use __PHYSFS_addToLinkedStringList().
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   193
    while ((ent = readdir(dir)) != NULL)
235
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   194
    {
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   195
        if (strcmp(ent->d_name, ".") == 0)
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   196
            continue;
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   197
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   198
        if (strcmp(ent->d_name, "..") == 0)
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   199
            continue;
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   200
4ad12914f652 Initial add.
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   201
        if (omitSymLinks)
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   202
        {
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   203
            char *p;
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   204
            int len = strlen(ent->d_name) + dlen + 1;
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   205
            if (len > bufsize)
4ad12914f652 Initial add.
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diff changeset
   206
            {
691
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   207
                p = (char *) allocator.Realloc(buf, len);
235
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   208
                if (p == NULL)
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   209
                    continue;
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   210
                buf = p;
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Ryan C. Gordon <icculus@icculus.org>
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   211
                bufsize = len;
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diff changeset
   212
            } /* if */
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   213
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   214
            strcpy(buf + dlen, ent->d_name);
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   215
            if (__PHYSFS_platformIsSymLink(buf))
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   216
                continue;
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parents:
diff changeset
   217
        } /* if */
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   218
754
e7cd7411eadf API BREAKAGE: Changed PHYSFS_enumerateFilesCallback() to pass the originally
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   219
        callback(callbackdata, origdir, ent->d_name);
235
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   220
    } /* while */
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parents:
diff changeset
   221
852
9467e96abdf1 Replaced some Malloc and all the alloca() calls with __PHYSFS_smallAlloc(),
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diff changeset
   222
    allocator.Free(buf);
235
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   223
    closedir(dir);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   224
} /* __PHYSFS_platformEnumerateFiles */
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   225
4ad12914f652 Initial add.
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   226
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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   227
int __PHYSFS_platformMkDir(const char *path)
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diff changeset
   228
{
4ad12914f652 Initial add.
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diff changeset
   229
    int rc;
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   230
    errno = 0;
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Ryan C. Gordon <icculus@icculus.org>
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   231
    rc = mkdir(path, S_IRWXU);
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   232
    BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   233
    return(1);
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   234
} /* __PHYSFS_platformMkDir */
4ad12914f652 Initial add.
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parents:
diff changeset
   235
4ad12914f652 Initial add.
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diff changeset
   236
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   237
static void *doOpen(const char *filename, int mode)
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   238
{
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   239
    int fd;
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
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diff changeset
   240
    int *retval;
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   241
    errno = 0;
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   242
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   243
    fd = open(filename, mode, S_IRUSR | S_IWUSR);
292
99bf6ef5639a Patched a bug where doOpen() reported success when the file couldn't be
Ryan C. Gordon <icculus@icculus.org>
parents: 259
diff changeset
   244
    BAIL_IF_MACRO(fd < 0, strerror(errno), NULL);
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   245
691
71d9affe0d8a All memory management now goes through allocation hooks instead of directly to
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   246
    retval = (int *) allocator.Malloc(sizeof (int));
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   247
    if (retval == NULL)
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   248
    {
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   249
        close(fd);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   250
        BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   251
    } /* if */
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   252
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   253
    *retval = fd;
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   254
    return((void *) retval);
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   255
} /* doOpen */
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   256
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   257
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   258
void *__PHYSFS_platformOpenRead(const char *filename)
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   259
{
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   260
    return(doOpen(filename, O_RDONLY));
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   261
} /* __PHYSFS_platformOpenRead */
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   262
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   263
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   264
void *__PHYSFS_platformOpenWrite(const char *filename)
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   265
{
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   266
    return(doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC));
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   267
} /* __PHYSFS_platformOpenWrite */
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   268
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   269
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   270
void *__PHYSFS_platformOpenAppend(const char *filename)
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   271
{
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   272
    return(doOpen(filename, O_WRONLY | O_CREAT | O_APPEND));
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   273
} /* __PHYSFS_platformOpenAppend */
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   274
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   275
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   276
PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   277
                                    PHYSFS_uint32 size, PHYSFS_uint32 count)
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   278
{
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   279
    int fd = *((int *) opaque);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   280
    int max = size * count;
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   281
    int rc = read(fd, buffer, max);
235
4ad12914f652 Initial add.
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parents:
diff changeset
   282
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   283
    BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   284
    assert(rc <= max);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   285
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   286
    if ((rc < max) && (size > 1))
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   287
        lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   288
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   289
    return(rc / size);
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   290
} /* __PHYSFS_platformRead */
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   291
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   292
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   293
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   294
                                     PHYSFS_uint32 size, PHYSFS_uint32 count)
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   295
{
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   296
    int fd = *((int *) opaque);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   297
    int max = size * count;
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   298
    int rc = write(fd, (void *) buffer, max);
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   299
251
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   300
    BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   301
    assert(rc <= max);
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   302
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   303
    if ((rc < max) && (size > 1))
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   304
        lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   305
0f4615263e32 Actual POSIX calls to replace ANSI stdio routines.
Ryan C. Gordon <icculus@icculus.org>
parents: 249
diff changeset
   306
    return(rc / size);
235
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   307
} /* __PHYSFS_platformWrite */
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   308
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   309
4ad12914f652 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
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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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259
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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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235
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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);
235
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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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240
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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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235
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/* end of posix.c ... */
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