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/* |
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* HT Editor |
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* sysfile.cc - file system functions for POSIX |
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* |
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* Copyright (C) 1999-2002 Stefan Weyergraf |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include <cerrno> |
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#include <fcntl.h> |
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#include <cstdio> |
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#include <cstdlib> |
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#include <cstddef> |
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#include <cstring> |
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#include <sys/stat.h> |
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#include <sys/time.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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|
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#include <limits.h> /* for PAGESIZE */ |
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#ifndef PAGESIZE |
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#define PAGESIZE 4096 |
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#endif |
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|
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#include "system/file.h" |
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|
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#include <dirent.h> |
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|
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struct posixfindstate { |
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DIR *fhandle; |
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}; |
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|
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inline bool sys_filename_is_absolute(const char *filename) |
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{ |
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return sys_is_path_delim(filename[0]); |
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} |
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|
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int sys_file_mode(int mode) |
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{ |
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int m = 0; |
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if (S_ISREG(mode)) { |
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m |= HT_S_IFREG; |
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} else if (S_ISBLK(mode)) { |
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m |= HT_S_IFBLK; |
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} else if (S_ISCHR(mode)) { |
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m |= HT_S_IFCHR; |
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} else if (S_ISDIR(mode)) { |
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m |= HT_S_IFDIR; |
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} else if (S_ISFIFO(mode)) { |
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m |= HT_S_IFFIFO; |
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} else if (S_ISLNK(mode)) { |
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m |= HT_S_IFLNK; |
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} else if (S_ISSOCK(mode)) { |
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m |= HT_S_IFSOCK; |
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} |
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if (mode & S_IRUSR) m |= HT_S_IRUSR; |
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if (mode & S_IRGRP) m |= HT_S_IRGRP; |
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if (mode & S_IROTH) m |= HT_S_IROTH; |
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|
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if (mode & S_IWUSR) m |= HT_S_IWUSR; |
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if (mode & S_IWGRP) m |= HT_S_IWGRP; |
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if (mode & S_IWOTH) m |= HT_S_IWOTH; |
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|
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if (mode & S_IXUSR) m |= HT_S_IXUSR; |
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if (mode & S_IXGRP) m |= HT_S_IXGRP; |
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if (mode & S_IXOTH) m |= HT_S_IXOTH; |
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return m; |
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} |
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|
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bool sys_is_path_delim(char c) |
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{ |
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return c == '/'; |
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} |
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|
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int sys_filename_cmp(const char *a, const char *b) |
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{ |
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while (*a && *b) { |
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if (sys_is_path_delim(*a) && sys_is_path_delim(*b)) { |
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} else if (*a != *b) { |
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break; |
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} |
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a++; |
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b++; |
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} |
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return *a - *b; |
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} |
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|
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int sys_canonicalize(char *result, const char *filename) |
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{ |
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if (!sys_filename_is_absolute(filename)) return ENOENT; |
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return (realpath(filename, result)==result) ? 0 : ENOENT; |
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} |
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|
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static char sys_find_dirname[HT_NAME_MAX]; |
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|
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int sys_findclose(pfind_t &pfind) |
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{ |
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int r = closedir(((posixfindstate*)pfind.findstate)->fhandle); |
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free(pfind.findstate); |
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return r; |
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} |
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|
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int sys_findfirst(pfind_t &pfind, const char *dirname) |
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{ |
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if (!sys_filename_is_absolute(dirname)) return ENOENT; |
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int r; |
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pfind.findstate = malloc(sizeof (posixfindstate)); |
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posixfindstate *pfs = (posixfindstate*)pfind.findstate; |
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if ((pfs->fhandle = opendir(dirname))) { |
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strcpy(sys_find_dirname, dirname); |
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char *s = sys_find_dirname+strlen(sys_find_dirname); |
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if ((s > sys_find_dirname) && (*(s-1) != '/')) { |
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*(s++) = '/'; |
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*s = 0; |
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} |
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r = sys_findnext(pfind); |
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} else r = errno ? errno : ENOENT; |
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if (r) free(pfind.findstate); |
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return r; |
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} |
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|
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int sys_findnext(pfind_t &pfind) |
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{ |
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posixfindstate *pfs = (posixfindstate*)pfind.findstate; |
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struct dirent *d; |
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if ((d = readdir(pfs->fhandle))) { |
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pfind.name = d->d_name; |
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char *s = sys_find_dirname+strlen(sys_find_dirname); |
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strcpy(s, d->d_name); |
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sys_pstat(pfind.stat, sys_find_dirname); |
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*s = 0; |
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return 0; |
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} |
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return ENOENT; |
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} |
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|
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static void stat_to_pstat_t(const struct stat &st, pstat_t &s) |
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{ |
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s.caps = pstat_ctime|pstat_mtime|pstat_atime|pstat_uid|pstat_gid|pstat_mode_all|pstat_size|pstat_inode; |
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s.ctime = st.st_ctime; |
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s.mtime = st.st_mtime; |
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s.atime = st.st_atime; |
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s.gid = st.st_uid; |
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s.uid = st.st_gid; |
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s.mode = sys_file_mode(st.st_mode); |
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s.size = st.st_size; |
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s.fsid = st.st_ino; |
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} |
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|
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int sys_pstat(pstat_t &s, const char *filename) |
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{ |
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if (!sys_filename_is_absolute(filename)) return ENOENT; |
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struct stat st; |
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errno = 0; |
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int e = lstat(filename, &st); |
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if (e) return errno ? errno : ENOENT; |
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stat_to_pstat_t(st, s); |
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return 0; |
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} |
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|
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int sys_pstat_fd(pstat_t &s, int fd) |
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{ |
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struct stat st; |
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errno = 0; |
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int e = fstat(fd, &st); |
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if (e) return errno ? errno : ENOENT; |
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stat_to_pstat_t(st, s); |
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return 0; |
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} |
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|
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int sys_truncate(const char *filename, FileOfs ofs) |
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{ |
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if (!sys_filename_is_absolute(filename)) return ENOENT; |
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int fd = open(filename, O_RDWR, 0); |
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if (fd < 0) return errno; |
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if (ftruncate(fd, ofs) != 0) return errno; |
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return close(fd); |
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} |
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|
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int sys_deletefile(const char *filename) |
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{ |
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if (!sys_filename_is_absolute(filename)) return ENOENT; |
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return remove(filename); |
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} |
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|
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int sys_truncate_fd(int fd, FileOfs ofs) |
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{ |
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if (ftruncate(fd, ofs) != 0) return errno; |
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return 0; |
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} |
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|
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void sys_suspend() |
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{ |
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timeval tm; |
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fd_set zerofds; |
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FD_ZERO(&zerofds); |
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|
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tm.tv_sec = 0; |
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tm.tv_usec = 100; |
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select(0, &zerofds, &zerofds, &zerofds, &tm); |
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} |
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|
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int sys_get_free_mem() |
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{ |
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return 0; |
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} |
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|
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SYS_FILE *sys_fopen(const char *filename, int openmode) |
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{ |
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if (openmode & SYS_OPEN_CREATE) { |
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return (SYS_FILE *)fopen(filename, "w+"); |
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} else { |
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if (openmode & SYS_OPEN_WRITE) { |
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return (SYS_FILE *)fopen(filename, "r+"); |
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} else { |
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return (SYS_FILE *)fopen(filename, "r"); |
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} |
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} |
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} |
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|
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void sys_fclose(SYS_FILE *file) |
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{ |
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fclose((FILE *)file); |
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} |
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|
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int sys_fread(SYS_FILE *file, byte *buf, int size) |
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{ |
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return fread(buf, 1, size, (FILE *)file); |
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} |
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|
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int sys_fwrite(SYS_FILE *file, byte *buf, int size) |
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{ |
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return fwrite(buf, 1, size, (FILE *)file); |
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} |
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|
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int sys_fseek(SYS_FILE *file, FileOfs newofs, int seekmode) |
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{ |
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int r; |
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switch (seekmode) { |
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case SYS_SEEK_SET: r = fseeko((FILE *)file, newofs, SEEK_SET); break; |
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case SYS_SEEK_REL: r = fseeko((FILE *)file, newofs, SEEK_CUR); break; |
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case SYS_SEEK_END: r = fseeko((FILE *)file, newofs, SEEK_END); break; |
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default: return EINVAL; |
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} |
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return r ? errno : 0; |
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} |
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|
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void sys_flush(SYS_FILE *file) |
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{ |
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fflush((FILE *)file); |
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} |
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|
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|
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FileOfs sys_ftell(SYS_FILE *file) |
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{ |
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return ftello((FILE *)file); |
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} |
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|
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void *sys_alloc_read_write_execute(int size) |
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{ |
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void *p = malloc(size+PAGESIZE-1); |
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if (!p) return NULL; |
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|
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void *ret = (void *)(((ptrdiff_t)p + PAGESIZE-1) & ~(PAGESIZE-1)); |
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|
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if (mprotect(ret, size, PROT_READ | PROT_WRITE | PROT_EXEC)) { |
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free(p); |
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return NULL; |
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} |
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return ret; |
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} |
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|
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void sys_free_read_write_execute(void *p) |
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{ |
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// do nothing :( |
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} |
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