/* * unlink.c --- delete links in a ext2fs directory * * Copyright (C) 1993, 1994, 1997 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Library * General Public License, version 2. * %End-Header% */ #include <stdio.h> #include <string.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #include "ext2_fs.h" #include "ext2fs.h" struct link_struct { const char *name; int namelen; ext2_ino_t inode; int flags; struct ext2_dir_entry *prev; int done; }; #ifdef __TURBOC__ #pragma argsused #endif static int unlink_proc(struct ext2_dir_entry *dirent, int offset, int blocksize EXT2FS_ATTR((unused)), char *buf EXT2FS_ATTR((unused)), void *priv_data) { struct link_struct *ls = (struct link_struct *) priv_data; struct ext2_dir_entry *prev; prev = ls->prev; ls->prev = dirent; if (ls->name) { if ((dirent->name_len & 0xFF) != ls->namelen) return 0; if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF)) return 0; } if (ls->inode) { if (dirent->inode != ls->inode) return 0; } else { if (!dirent->inode) return 0; } if (offset) prev->rec_len += dirent->rec_len; else dirent->inode = 0; ls->done++; return DIRENT_ABORT|DIRENT_CHANGED; } #ifdef __TURBOC__ #pragma argsused #endif errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir, const char *name, ext2_ino_t ino, int flags EXT2FS_ATTR((unused))) { errcode_t retval; struct link_struct ls; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); if (!name && !ino) return EXT2_ET_INVALID_ARGUMENT; if (!(fs->flags & EXT2_FLAG_RW)) return EXT2_ET_RO_FILSYS; ls.name = name; ls.namelen = name ? strlen(name) : 0; ls.inode = ino; ls.flags = 0; ls.done = 0; ls.prev = 0; retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY, 0, unlink_proc, &ls); if (retval) return retval; return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE; }