author | Wuzzy <almikes@aol.com> |
Thu, 12 May 2016 19:33:30 +0200 | |
changeset 12201 | 2c0811bbc1d9 |
parent 9799 | a3fe81c3bc02 |
child 12213 | bb5522e88ab2 |
permissions | -rw-r--r-- |
7768 | 1 |
/* |
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* Unix 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_UNIX |
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#include <ctype.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <pwd.h> |
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#include <sys/stat.h> |
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#include <sys/param.h> |
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#include <dirent.h> |
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#include <time.h> |
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#include <errno.h> |
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#if PHYSFS_PLATFORM_LINUX && !defined(PHYSFS_HAVE_MNTENT_H) |
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#define PHYSFS_HAVE_MNTENT_H 1 |
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#elif PHYSFS_PLATFORM_SOLARIS && !defined(PHYSFS_HAVE_SYS_MNTTAB_H) |
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#define PHYSFS_HAVE_SYS_MNTTAB_H 1 |
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#elif PHYSFS_PLATFORM_BSD && !defined(PHYSFS_HAVE_SYS_UCRED_H) |
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#define PHYSFS_HAVE_SYS_UCRED_H 1 |
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#endif |
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#ifdef PHYSFS_HAVE_SYS_UCRED_H |
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# ifdef PHYSFS_HAVE_MNTENT_H |
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# undef PHYSFS_HAVE_MNTENT_H /* don't do both... */ |
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# endif |
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# include <sys/mount.h> |
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# include <sys/ucred.h> |
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#endif |
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#ifdef PHYSFS_HAVE_MNTENT_H |
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#include <mntent.h> |
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#endif |
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#ifdef PHYSFS_HAVE_SYS_MNTTAB_H |
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#include <sys/mnttab.h> |
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#endif |
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#include "physfs_internal.h" |
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int __PHYSFS_platformInit(void) |
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{ |
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return 1; /* always succeed. */ |
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} /* __PHYSFS_platformInit */ |
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int __PHYSFS_platformDeinit(void) |
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{ |
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return 1; /* always succeed. */ |
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} /* __PHYSFS_platformDeinit */ |
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/* Stub version for platforms without CD-ROM support. */ |
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void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data) |
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{ |
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#if (defined PHYSFS_NO_CDROM_SUPPORT) |
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/* no-op. */ |
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#elif (defined PHYSFS_HAVE_SYS_UCRED_H) |
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int i; |
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struct statfs *mntbufp = NULL; |
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int mounts = getmntinfo(&mntbufp, MNT_WAIT); |
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for (i = 0; i < mounts; i++) |
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{ |
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int add_it = 0; |
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if (strcmp(mntbufp[i].f_fstypename, "iso9660") == 0) |
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add_it = 1; |
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else if (strcmp( mntbufp[i].f_fstypename, "cd9660") == 0) |
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add_it = 1; |
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/* add other mount types here */ |
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if (add_it) |
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cb(data, mntbufp[i].f_mntonname); |
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} /* for */ |
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#elif (defined PHYSFS_HAVE_MNTENT_H) |
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FILE *mounts = NULL; |
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struct mntent *ent = NULL; |
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mounts = setmntent("/etc/mtab", "r"); |
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BAIL_IF_MACRO(mounts == NULL, PHYSFS_ERR_IO, /*return void*/); |
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while ( (ent = getmntent(mounts)) != NULL ) |
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{ |
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int add_it = 0; |
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if (strcmp(ent->mnt_type, "iso9660") == 0) |
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add_it = 1; |
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else if (strcmp(ent->mnt_type, "udf") == 0) |
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add_it = 1; |
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/* !!! FIXME: these might pick up floppy drives, right? */ |
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else if (strcmp(ent->mnt_type, "auto") == 0) |
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add_it = 1; |
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else if (strcmp(ent->mnt_type, "supermount") == 0) |
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add_it = 1; |
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/* !!! FIXME: udf? automount? */ |
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/* add other mount types here */ |
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if (add_it) |
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cb(data, ent->mnt_dir); |
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} /* while */ |
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endmntent(mounts); |
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#elif (defined PHYSFS_HAVE_SYS_MNTTAB_H) |
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FILE *mounts = fopen(MNTTAB, "r"); |
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struct mnttab ent; |
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BAIL_IF_MACRO(mounts == NULL, PHYSFS_ERR_IO, /*return void*/); |
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while (getmntent(mounts, &ent) == 0) |
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{ |
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int add_it = 0; |
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if (strcmp(ent.mnt_fstype, "hsfs") == 0) |
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add_it = 1; |
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/* add other mount types here */ |
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if (add_it) |
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cb(data, ent.mnt_mountp); |
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} /* while */ |
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fclose(mounts); |
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#else |
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#error Unknown platform. Should have defined PHYSFS_NO_CDROM_SUPPORT, perhaps. |
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#endif |
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} /* __PHYSFS_platformDetectAvailableCDs */ |
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/* |
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* See where program (bin) resides in the $PATH specified by (envr). |
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* returns a copy of the first element in envr that contains it, or NULL |
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* if it doesn't exist or there were other problems. PHYSFS_SetError() is |
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* called if we have a problem. |
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* |
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* (envr) will be scribbled over, and you are expected to allocator.Free() the |
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* return value when you're done with it. |
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*/ |
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static char *findBinaryInPath(const char *bin, char *envr) |
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{ |
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size_t alloc_size = 0; |
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char *exe = NULL; |
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char *start = envr; |
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char *ptr; |
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assert(bin != NULL); |
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assert(envr != NULL); |
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do |
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{ |
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size_t size; |
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size_t binlen; |
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ptr = strchr(start, ':'); /* find next $PATH separator. */ |
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if (ptr) |
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*ptr = '\0'; |
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binlen = strlen(bin); |
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size = strlen(start) + binlen + 2; |
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if (size > alloc_size) |
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{ |
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char *x = (char *) allocator.Realloc(exe, size); |
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if (!x) |
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{ |
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if (exe != NULL) |
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allocator.Free(exe); |
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BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
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} /* if */ |
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alloc_size = size; |
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exe = x; |
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} /* if */ |
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/* build full binary path... */ |
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strcpy(exe, start); |
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if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/')) |
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strcat(exe, "/"); |
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strcat(exe, bin); |
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if (access(exe, X_OK) == 0) /* Exists as executable? We're done. */ |
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{ |
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9799
a3fe81c3bc02
Fix off-by-one in physfs
Dmitry Marakasov <amdmi3@amdmi3.ru>
parents:
8524
diff
changeset
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exe[size - binlen - 1] = '\0'; /* chop off filename, leave '/' */ |
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return exe; |
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} /* if */ |
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start = ptr + 1; /* start points to beginning of next element. */ |
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} while (ptr != NULL); |
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if (exe != NULL) |
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allocator.Free(exe); |
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return NULL; /* doesn't exist in path. */ |
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} /* findBinaryInPath */ |
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static char *readSymLink(const char *path) |
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{ |
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ssize_t len = 64; |
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ssize_t rc = -1; |
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char *retval = NULL; |
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while (1) |
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{ |
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char *ptr = (char *) allocator.Realloc(retval, (size_t) len); |
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if (ptr == NULL) |
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break; /* out of memory. */ |
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retval = ptr; |
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rc = readlink(path, retval, len); |
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if (rc == -1) |
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break; /* not a symlink, i/o error, etc. */ |
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else if (rc < len) |
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{ |
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retval[rc] = '\0'; /* readlink doesn't null-terminate. */ |
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return retval; /* we're good to go. */ |
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} /* else if */ |
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len *= 2; /* grow buffer, try again. */ |
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} /* while */ |
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if (retval != NULL) |
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allocator.Free(retval); |
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return NULL; |
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} /* readSymLink */ |
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char *__PHYSFS_platformCalcBaseDir(const char *argv0) |
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{ |
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char *retval = NULL; |
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const char *envr = NULL; |
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/* |
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* Try to avoid using argv0 unless forced to. If there's a Linux-like |
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* /proc filesystem, you can get the full path to the current process from |
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* the /proc/self/exe symlink. |
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*/ |
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retval = readSymLink("/proc/self/exe"); |
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if (retval == NULL) |
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{ |
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/* older kernels don't have /proc/self ... try PID version... */ |
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const unsigned long long pid = (unsigned long long) getpid(); |
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char path[64]; |
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const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid); |
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if ( (rc > 0) && (rc < sizeof(path)) ) |
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retval = readSymLink(path); |
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} /* if */ |
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if (retval != NULL) /* chop off filename. */ |
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{ |
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char *ptr = strrchr(retval, '/'); |
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if (ptr != NULL) |
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*(ptr+1) = '\0'; |
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else /* shouldn't happen, but just in case... */ |
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{ |
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allocator.Free(retval); |
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retval = NULL; |
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} /* else */ |
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} /* if */ |
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/* No /proc/self/exe, but we have an argv[0] we can parse? */ |
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if ((retval == NULL) && (argv0 != NULL)) |
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{ |
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/* fast path: default behaviour can handle this. */ |
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if (strchr(argv0, '/') != NULL) |
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return NULL; /* higher level parses out real path from argv0. */ |
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/* If there's no dirsep on argv0, then look through $PATH for it. */ |
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envr = getenv("PATH"); |
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if (envr != NULL) |
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{ |
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char *path = (char *) __PHYSFS_smallAlloc(strlen(envr) + 1); |
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BAIL_IF_MACRO(!path, PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
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strcpy(path, envr); |
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retval = findBinaryInPath(argv0, path); |
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__PHYSFS_smallFree(path); |
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} /* if */ |
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} /* if */ |
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if (retval != NULL) |
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{ |
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/* try to shrink buffer... */ |
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char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1); |
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if (ptr != NULL) |
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retval = ptr; /* oh well if it failed. */ |
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} /* if */ |
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return retval; |
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} /* __PHYSFS_platformCalcBaseDir */ |
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char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app) |
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{ |
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/* |
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* We use XDG's base directory spec, even if you're not on Linux. |
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* This isn't strictly correct, but the results are relatively sane |
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* in any case. |
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* |
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* http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html |
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*/ |
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const char *envr = getenv("XDG_DATA_HOME"); |
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const char *append = "/"; |
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char *retval = NULL; |
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size_t len = 0; |
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if (!envr) |
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{ |
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/* You end up with "$HOME/.local/share/Game Name 2" */ |
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envr = __PHYSFS_getUserDir(); |
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BAIL_IF_MACRO(!envr, ERRPASS, NULL); /* oh well. */ |
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append = ".local/share/"; |
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} /* if */ |
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len = strlen(envr) + strlen(append) + strlen(app) + 2; |
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retval = (char *) allocator.Malloc(len); |
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BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
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snprintf(retval, len, "%s%s%s/", envr, append, app); |
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return retval; |
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} /* __PHYSFS_platformCalcPrefDir */ |
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int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a) |
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{ |
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return 0; /* just use malloc() and friends. */ |
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} /* __PHYSFS_platformSetDefaultAllocator */ |
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#endif /* PHYSFS_PLATFORM_UNIX */ |
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/* end of unix.c ... */ |
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