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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [libfs/] [src/] [dosfs/] [msdos_misc.c] - Rev 1765
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/* * Miscellaneous routines implementation for MSDOS filesystem * * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia * Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru> * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * @(#) msdos_misc.c,v 1.1 2002/02/28 20:43:50 joel Exp */ #if HAVE_CONFIG_H #include "config.h" #endif #include <stdlib.h> #include <sys/time.h> #include <unistd.h> #include <string.h> #include <assert.h> #include <rtems/libio_.h> #include "fat.h" #include "fat_fat_operations.h" #include "fat_file.h" #include "msdos.h" /* This copied from Linux */ static int day_n[] = { 0,31,59,90,120,151,181,212,243,273,304,334,0,0,0,0 }; /* JanFebMarApr May Jun Jul Aug Sep Oct Nov Dec */ #undef CONFIG_ATARI /* MS-DOS "device special files" */ static const char *reserved_names[] = { #ifndef CONFIG_ATARI /* GEMDOS is less stupid */ "CON ","PRN ","NUL ","AUX ", "LPT1 ","LPT2 ","LPT3 ","LPT4 ", "COM1 ","COM2 ","COM3 ","COM4 ", #endif NULL }; static char bad_chars[] = "*?<>|\""; #ifdef CONFIG_ATARI /* GEMDOS is less restrictive */ static char bad_if_strict[] = " "; #else static char bad_if_strict[] = "+=,; "; #endif /* The following three functions copied from Linux */ /* * Formats an MS-DOS file name. Rejects invalid names * * conv is relaxed/normal/strict, name is proposed name, * len is the length of the proposed name, res is the result name, * dotsOK is if hidden files get dots. */ int msdos_format_name(char conv, const char *name, int len, char *res, char dotsOK) { char *walk; const char **reserved; unsigned char c; int space; if (name[0] == '.') { /* dotfile because . and .. already done */ if (!dotsOK) return -EINVAL; /* Get rid of dot - test for it elsewhere */ name++; len--; } #ifndef CONFIG_ATARI space = 1; /* disallow names that _really_ start with a dot */ #else space = 0; /* GEMDOS does not care */ #endif c = 0; for (walk = res; len && walk-res < 8; walk++) { c = *name++; len--; if (conv != 'r' && strchr(bad_chars,c)) return -EINVAL; if (conv == 's' && strchr(bad_if_strict,c)) return -EINVAL; if (c >= 'A' && c <= 'Z' && conv == 's') return -EINVAL; if (c < ' ' || c == ':' || c == '\\') return -EINVAL; /* 0xE5 is legal as a first character, but we must substitute 0x05 */ /* because 0xE5 marks deleted files. Yes, DOS really does this. */ /* It seems that Microsoft hacked DOS to support non-US characters */ /* after the 0xE5 character was already in use to mark deleted files. */ if((res==walk) && (c==0xE5)) c=0x05; if (c == '.') break; space = (c == ' '); *walk = (c >= 'a' && c <= 'z') ? c-32 : c; } if (space) return -EINVAL; if (conv == 's' && len && c != '.') { c = *name++; len--; if (c != '.') return -EINVAL; } while (c != '.' && len--) c = *name++; if (c == '.') { while (walk-res < 8) *walk++ = ' '; while (len > 0 && walk-res < MSDOS_NAME_MAX) { c = *name++; len--; if (conv != 'r' && strchr(bad_chars,c)) return -EINVAL; if (conv == 's' && strchr(bad_if_strict,c)) return -EINVAL; if (c < ' ' || c == ':' || c == '\\') return -EINVAL; if (c == '.') { if (conv == 's') return -EINVAL; break; } if (c >= 'A' && c <= 'Z' && conv == 's') return -EINVAL; space = c == ' '; *walk++ = c >= 'a' && c <= 'z' ? c-32 : c; } if (space) return -EINVAL; if (conv == 's' && len) return -EINVAL; } while (walk-res < MSDOS_NAME_MAX) *walk++ = ' '; for (reserved = reserved_names; *reserved; reserved++) if (!strncmp(res,*reserved,8)) return -EINVAL; return 0; } /* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70) */ unsigned int msdos_date_dos2unix(unsigned short time_val,unsigned short date) { int month,year,secs; month = ((date >> 5) & 15)-1; year = date >> 9; secs = (time_val & 31)*2+60*((time_val >> 5) & 63)+ (time_val >> 11)*3600+86400* ((date & 31)-1+day_n[month]+(year/4)+year*365-((year & 3) == 0 && month < 2 ? 1 : 0)+3653); /* days since 1.1.70 plus 80's leap day */ return secs; } /* Convert linear UNIX date to a MS-DOS time/date pair */ void msdos_date_unix2dos(int unix_date, unsigned short *time_val, unsigned short *date) { int day,year,nl_day,month; *time_val = (unix_date % 60)/2+(((unix_date/60) % 60) << 5)+ (((unix_date/3600) % 24) << 11); day = unix_date/86400-3652; year = day/365; if ((year+3)/4+365*year > day) year--; day -= (year+3)/4+365*year; if (day == 59 && !(year & 3)) { nl_day = day; month = 2; } else { nl_day = (year & 3) || day <= 59 ? day : day-1; for (month = 0; month < 12; month++) if (day_n[month] > nl_day) break; } *date = nl_day-day_n[month-1]+1+(month << 5)+(year << 9); } /* msdos_get_token -- * Routine to get a token (name or separator) from the path. * * PARAMETERS: * path - path to get token from * ret_token - returned token * token_len - length of returned token * * RETURNS: * token type, token and token length * */ msdos_token_types_t msdos_get_token(const char *path, char *ret_token, int *token_len) { int rc = RC_OK; register int i = 0; msdos_token_types_t type = MSDOS_NAME; char token[MSDOS_NAME_MAX_WITH_DOT+1]; register char c; /* * Copy a name into token. (Remember NULL is a token.) */ c = path[i]; while ( (!msdos_is_separator(c)) && (i <= MSDOS_NAME_MAX_WITH_DOT) ) { token[i] = c; if ( i == MSDOS_NAME_MAX_WITH_DOT ) return MSDOS_INVALID_TOKEN; if ( !msdos_is_valid_name_char(c) ) return MSDOS_INVALID_TOKEN; c = path [++i]; } /* * Copy a seperator into token. */ if ( i == 0 ) { token[i] = c; if ( token[i] != '\0' ) { i++; type = MSDOS_CURRENT_DIR; } else type = MSDOS_NO_MORE_PATH; } else if (token[ i-1 ] != '\0') token[i] = '\0'; /* * Set token_len to the number of characters copied. */ *token_len = i; /* * If we copied something that was not a seperator see if * it was a special name. */ if ( type == MSDOS_NAME ) { if ( strcmp( token, "..") == 0 ) { strcpy(ret_token, MSDOS_DOTDOT_NAME); type = MSDOS_UP_DIR; return type; } if ( strcmp( token, "." ) == 0 ) { strcpy(ret_token, MSDOS_DOT_NAME); type = MSDOS_CURRENT_DIR; return type; } rc = msdos_format_name('r', token, *token_len, ret_token, 0); if ( rc != RC_OK ) return MSDOS_INVALID_TOKEN; } ret_token[MSDOS_NAME_MAX] = '\0'; return type; } /* msdos_find_name -- * Find the node which correspondes to the name, open fat-file which * correspondes to the found node and close fat-file which correspondes * to the node we searched in. * * PARAMETERS: * parent_loc - parent node description * name - name to find * * RETURNS: * RC_OK and updated 'parent_loc' on success, or -1 if error * occured (errno set apropriately) * */ int msdos_find_name( rtems_filesystem_location_info_t *parent_loc, char *name ) { int rc = RC_OK; msdos_fs_info_t *fs_info = parent_loc->mt_entry->fs_info; fat_file_fd_t *fat_fd = NULL; fat_auxiliary_t aux; unsigned short time_val = 0; unsigned short date = 0; unsigned char node_entry[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE]; memset(node_entry, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); /* * find the node which correspondes to the name in the directory pointed by * 'parent_loc' */ rc = msdos_get_name_node(parent_loc, name, &aux, node_entry); if (rc != RC_OK) return rc; /* open fat-file corresponded to the found node */ rc = fat_file_open(parent_loc->mt_entry, aux.cln, aux.ofs, &fat_fd); if (rc != RC_OK) return rc; /* * I don't like this if, but: we should do it , or should write new file * size and first cluster num to the disk after each write operation * (even if one byte is written - that is TOO non-optimize) because * otherwise real values of these fields stored in fat-file descriptor * may be accidentely rewritten with wrong values stored on the disk */ if (fat_fd->links_num == 1) { fat_fd->info_cln = aux.cln; fat_fd->info_ofs = aux.ofs; fat_fd->cln = MSDOS_EXTRACT_CLUSTER_NUM(node_entry); fat_fd->first_char = *MSDOS_DIR_NAME(node_entry); time_val = *MSDOS_DIR_WRITE_TIME(node_entry); date = *MSDOS_DIR_WRITE_DATE(node_entry); fat_fd->mtime = msdos_date_dos2unix(CF_LE_W(time_val), CF_LE_W(date)); if ((*MSDOS_DIR_ATTR(node_entry)) & MSDOS_ATTR_DIRECTORY) { fat_fd->fat_file_type = FAT_DIRECTORY; fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT; rc = fat_file_size(parent_loc->mt_entry, fat_fd); if (rc != RC_OK) { fat_file_close(parent_loc->mt_entry, fat_fd); return rc; } } else { fat_fd->fat_file_size = CF_LE_L(*MSDOS_DIR_FILE_SIZE(node_entry)); fat_fd->fat_file_type = FAT_FILE; fat_fd->size_limit = MSDOS_MAX_FILE_SIZE; } /* these data is not actual for zero-length fat-file */ fat_fd->map.file_cln = 0; fat_fd->map.disk_cln = fat_fd->cln; if ((fat_fd->fat_file_size != 0) && (fat_fd->fat_file_size <= fs_info->fat.vol.bpc)) { fat_fd->map.last_cln = fat_fd->cln; } else { fat_fd->map.last_cln = FAT_UNDEFINED_VALUE; } } /* close fat-file corresponded to the node we searched in */ rc = fat_file_close(parent_loc->mt_entry, parent_loc->node_access); if (rc != RC_OK) { fat_file_close(parent_loc->mt_entry, fat_fd); return rc; } /* update node_info_ptr field */ parent_loc->node_access = fat_fd; return rc; } /* msdos_get_name_node -- * This routine is used in two ways: for a new mode creation (a) or for * search the node which correspondes to the name parameter (b). * In case (a) 'name' should be set up to NULL and 'name_dir_entry' should * point to initialized 32 bytes structure described a new node. * In case (b) 'name' should contain a valid string. * * (a): reading fat-file which correspondes to directory we are going to * create node in. If free slot is found write contents of * 'name_dir_entry' into it. If reach end of fat-file and no free * slot found, write 32 bytes to the end of fat-file. * * (b): reading fat-file which correspondes to directory and trying to * find slot with the name field == 'name' parameter * * * PARAMETERS: * parent_loc - node description to create node in or to find name in * name - NULL or name to find * paux - identify a node location on the disk - * cluster num and offset inside the cluster * name_dir_entry - node to create/placeholder for found node (IN/OUT) * * RETURNS: * RC_OK, filled aux_struct_ptr and name_dir_entry on success, or -1 if * error occured (errno set apropriately) * */ int msdos_get_name_node( rtems_filesystem_location_info_t *parent_loc, char *name, fat_auxiliary_t *paux, char *name_dir_entry ) { int rc = RC_OK; ssize_t ret = 0; msdos_fs_info_t *fs_info = parent_loc->mt_entry->fs_info; fat_file_fd_t *fat_fd = parent_loc->node_access; unsigned32 dotdot_cln = 0; /* find name in fat-file which correspondes to the directory */ rc = msdos_find_name_in_fat_file(parent_loc->mt_entry, fat_fd, name, paux, name_dir_entry); if ((rc != RC_OK) && (rc != MSDOS_NAME_NOT_FOUND_ERR)) return rc; /* if we search for valid name and name not found -> return */ if ((rc == MSDOS_NAME_NOT_FOUND_ERR) && (name != NULL)) return rc; /* * if we try to create new entry and the directory is not big enough * currently - try to enlarge directory */ if ((rc == MSDOS_NAME_NOT_FOUND_ERR) && (name == NULL)) { ret = fat_file_write(parent_loc->mt_entry, fat_fd, fat_fd->fat_file_size, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE, name_dir_entry); if (ret == -1) return -1; /* on success directory is enlarged by a new cluster */ fat_fd->fat_file_size += fs_info->fat.vol.bpc; /* get cluster num where a new node located */ rc = fat_file_ioctl(parent_loc->mt_entry, fat_fd, F_CLU_NUM, fat_fd->fat_file_size - 1, &paux->cln); if (rc != RC_OK) return rc; /* * if new cluster allocated succesfully then new node is at very * beginning of the cluster (offset is computed in bytes) */ paux->ofs = 0; return RC_OK; } /* * if we have deal with ".." - it is a special case :((( * * Really, we should return cluster num and offset not of ".." slot, but * slot which correspondes to real directory name. */ if ((rc == RC_OK) && (name != NULL)) { if (strncmp(name, MSDOS_DOTDOT_NAME, MSDOS_SHORT_NAME_LEN) == 0) { dotdot_cln = MSDOS_EXTRACT_CLUSTER_NUM((name_dir_entry)); /* are we right under root dir ? */ if (dotdot_cln == 0) { /* * we can relax about first_char field - it never should be * used for root dir */ paux->cln = FAT_ROOTDIR_CLUSTER_NUM; paux->ofs = 0; } else { rc = msdos_get_dotdot_dir_info_cluster_num_and_offset( parent_loc->mt_entry, dotdot_cln, paux, name_dir_entry ); if (rc != RC_OK) return rc; } } } return rc; } /* * msdos_get_dotdot_dir_info_cluster_num_and_offset * * Unfortunately, in general, we cann't work here in fat-file ideologic * (open fat_file "..", get ".." and ".", open "..", find an entry ...) * because if we open * fat-file ".." it may happend that we have two different fat-file * descriptors ( for real name of directory and ".." name ) for a single * file ( cluster num of both pointers to the same cluster ) * But...we do it because we protected by semaphore * */ /* msdos_get_dotdot_dir_info_cluster_num_and_offset -- * Get cluster num and offset not of ".." slot, but slot which correspondes * to real directory name. * * PARAMETERS: * mt_entry - mount table entry * cln - data cluster num extracted drom ".." slot * paux - identify a node location on the disk - * number of cluster and offset inside the cluster * dir_entry - placeholder for found node * * RETURNS: * RC_OK, filled 'paux' and 'dir_entry' on success, or -1 if error occured * (errno set apropriately) * */ int msdos_get_dotdot_dir_info_cluster_num_and_offset( rtems_filesystem_mount_table_entry_t *mt_entry, unsigned32 cln, fat_auxiliary_t *paux, char *dir_entry ) { int rc = RC_OK; msdos_fs_info_t *fs_info = mt_entry->fs_info; fat_file_fd_t *fat_fd = NULL; unsigned char dot_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE]; unsigned char dotdot_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE]; unsigned char cur_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE]; unsigned32 cl4find = 0; memset(dot_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); memset(dotdot_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); memset(cur_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); /* * open fat-file corresponded to ".." */ rc = fat_file_open(mt_entry, paux->cln, paux->ofs, &fat_fd); if (rc != RC_OK) return rc; fat_fd->info_cln = paux->cln; fat_fd->info_ofs = paux->ofs; fat_fd->cln = cln; fat_fd->fat_file_type = FAT_DIRECTORY; fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT; fat_fd->map.file_cln = 0; fat_fd->map.disk_cln = fat_fd->cln; rc = fat_file_size(mt_entry, fat_fd); if (rc != RC_OK) { fat_file_close(mt_entry, fat_fd); return rc; } /* find "." node in opened directory */ rc = msdos_find_name_in_fat_file(mt_entry, fat_fd, MSDOS_DOT_NAME, paux, dot_node); if (rc != RC_OK) { fat_file_close(mt_entry, fat_fd); return rc; } /* find ".." node in opened directory */ rc = msdos_find_name_in_fat_file(mt_entry, fat_fd, MSDOS_DOTDOT_NAME, paux, dotdot_node); if (rc != RC_OK) { fat_file_close(mt_entry, fat_fd); return rc; } cl4find = MSDOS_EXTRACT_CLUSTER_NUM(dot_node); /* close fat-file corresponded to ".." directory */ rc = fat_file_close(mt_entry, fat_fd); if ( rc != RC_OK ) return rc; if ( (MSDOS_EXTRACT_CLUSTER_NUM(dotdot_node)) == 0) { /* * we handle root dir for all FAT types in the same way with the * ordinary directories ( through fat_file_* calls ) */ paux->cln = FAT_ROOTDIR_CLUSTER_NUM; paux->ofs = 0; } /* open fat-file corresponded to second ".." */ rc = fat_file_open(mt_entry, paux->cln, paux->ofs, &fat_fd); if (rc != RC_OK) return rc; fat_fd->info_cln = paux->cln; fat_fd->info_ofs = paux->ofs; if ((MSDOS_EXTRACT_CLUSTER_NUM(dotdot_node)) == 0) fat_fd->cln = fs_info->fat.vol.rdir_cl; else fat_fd->cln = MSDOS_EXTRACT_CLUSTER_NUM(dotdot_node); fat_fd->fat_file_type = FAT_DIRECTORY; fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT; fat_fd->map.file_cln = 0; fat_fd->map.disk_cln = fat_fd->cln; rc = fat_file_size(mt_entry, fat_fd); if (rc != RC_OK) { fat_file_close(mt_entry, fat_fd); return rc; } /* in this directory find slot with specified cluster num */ rc = msdos_find_node_by_cluster_num_in_fat_file(mt_entry, fat_fd, cl4find, paux, dir_entry); if (rc != RC_OK) { fat_file_close(mt_entry, fat_fd); return rc; } rc = fat_file_close(mt_entry, fat_fd); return rc; } /* msdos_set_dir_wrt_time_and_date -- * Write last write date and time for a file to the disk (to corresponded * 32bytes node) * * PARAMETERS: * mt_entry - mount table entry * fat_fd - fat-file descriptor * * RETURNS: * RC_OK on success, or -1 if error occured (errno set apropriately). * */ int msdos_set_dir_wrt_time_and_date( rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd ) { ssize_t ret1 = 0, ret2 = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned short time_val; unsigned short date; unsigned32 sec = 0; unsigned32 byte = 0; msdos_date_unix2dos(fat_fd->mtime, &time_val, &date); /* * calculate input for _fat_block_write: convert (cluster num, offset) to * (sector num, new offset) */ sec = fat_cluster_num_to_sector_num(mt_entry, fat_fd->info_cln); sec += (fat_fd->info_ofs >> fs_info->fat.vol.sec_log2); /* byte points to start of 32bytes structure */ byte = fat_fd->info_ofs & (fs_info->fat.vol.bps - 1); time_val = CT_LE_W(time_val); ret1 = _fat_block_write(mt_entry, sec, byte + MSDOS_FILE_WTIME_OFFSET, 2, (char *)(&time_val)); date = CT_LE_W(date); ret2 = _fat_block_write(mt_entry, sec, byte + MSDOS_FILE_WDATE_OFFSET, 2, (char *)(&date)); if ( (ret1 < 0) || (ret2 < 0) ) return -1; return RC_OK; } /* msdos_set_first_cluster_num -- * Write number of first cluster of the file to the disk (to corresponded * 32bytes slot) * * PARAMETERS: * mt_entry - mount table entry * fat_fd - fat-file descriptor * * RETURNS: * RC_OK on success, or -1 if error occured * */ int msdos_set_first_cluster_num( rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd ) { ssize_t ret1 = 0, ret2 = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned32 new_cln = fat_fd->cln; unsigned16 le_cl_low = 0; unsigned16 le_cl_hi = 0; unsigned32 sec = 0; unsigned32 byte = 0; /* * calculate input for _fat_block_write: convert (cluster num, offset) to * (sector num, new offset) */ sec = fat_cluster_num_to_sector_num(mt_entry, fat_fd->info_cln); sec += (fat_fd->info_ofs >> fs_info->fat.vol.sec_log2); /* byte from points to start of 32bytes structure */ byte = fat_fd->info_ofs & (fs_info->fat.vol.bps - 1); le_cl_low = CT_LE_W((unsigned16)(new_cln & 0x0000FFFF)); ret1 = _fat_block_write(mt_entry, sec, byte + MSDOS_FIRST_CLUSTER_LOW_OFFSET, 2, (char *)(&le_cl_low)); le_cl_hi = CT_LE_W((unsigned16)((new_cln & 0xFFFF0000) >> 16)); ret2 = _fat_block_write(mt_entry, sec, byte + MSDOS_FIRST_CLUSTER_HI_OFFSET, 2, (char *)(&le_cl_hi)); if ( (ret1 < 0) || (ret2 < 0) ) return -1; return RC_OK; } /* msdos_set_file size -- * Write file size of the file to the disk (to corresponded 32bytes slot) * * PARAMETERS: * mt_entry - mount table entry * fat_fd - fat-file descriptor * * RETURNS: * RC_OK on success, or -1 if error occured (errno set apropriately). * */ int msdos_set_file_size( rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd ) { ssize_t ret = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned32 le_new_length = 0; unsigned32 sec = 0; unsigned32 byte = 0; sec = fat_cluster_num_to_sector_num(mt_entry, fat_fd->info_cln); sec += (fat_fd->info_ofs >> fs_info->fat.vol.sec_log2); byte = (fat_fd->info_ofs & (fs_info->fat.vol.bps - 1)); le_new_length = CT_LE_L((fat_fd->fat_file_size)); ret = _fat_block_write(mt_entry, sec, byte + MSDOS_FILE_SIZE_OFFSET, 4, (char *)(&le_new_length)); if ( ret < 0 ) return -1; return RC_OK; } /* * We should not check whether this routine is called for root dir - it * never can happend */ /* msdos_set_first_char4file_name -- * Write first character of the name of the file to the disk (to * corresponded 32bytes slot) * * PARAMETERS: * mt_entry - mount table entry * cl - number of cluster * ofs - offset inside cluster * fchar - character to set up * * RETURNS: * RC_OK on success, or -1 if error occured (errno set apropriately) * */ int msdos_set_first_char4file_name( rtems_filesystem_mount_table_entry_t *mt_entry, unsigned32 cl, unsigned32 ofs, unsigned char fchar ) { ssize_t ret = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned32 sec = 0; unsigned32 byte = 0; sec = fat_cluster_num_to_sector_num(mt_entry, cl); sec += (ofs >> fs_info->fat.vol.sec_log2); byte = (ofs & (fs_info->fat.vol.bps - 1)); ret = _fat_block_write(mt_entry, sec, byte + MSDOS_FILE_NAME_OFFSET, 1, &fchar); if ( ret < 0) return -1; return RC_OK; } /* msdos_dir_is_empty -- * Check whether directory which correspondes to the fat-file descriptor is * empty. * * PARAMETERS: * mt_entry - mount table entry * fat_fd - fat-file descriptor * ret_val - placeholder for result * * RETURNS: * RC_OK on success, or -1 if error occured * */ int msdos_dir_is_empty( rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd, rtems_boolean *ret_val ) { ssize_t ret = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned32 j = 0, i = 0; /* dir is not empty */ *ret_val = FALSE; while ((ret = fat_file_read(mt_entry, fat_fd, j * fs_info->fat.vol.bps, fs_info->fat.vol.bps, fs_info->cl_buf)) != FAT_EOF) { if (ret < MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) return -1; assert(ret == fs_info->fat.vol.bps); for (i = 0; i < fs_info->fat.vol.bps; i += MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) { if (((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_EMPTY) || (strncmp(MSDOS_DIR_NAME((fs_info->cl_buf + i)), MSDOS_DOT_NAME, MSDOS_SHORT_NAME_LEN) == 0) || (strncmp(MSDOS_DIR_NAME((fs_info->cl_buf + i)), MSDOS_DOTDOT_NAME, MSDOS_SHORT_NAME_LEN) == 0)) continue; if ((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY) { *ret_val = TRUE; return RC_OK; } return RC_OK; } j++; } *ret_val = TRUE; return RC_OK; } /* msdos_find_name_in_fat_file -- * This routine is used in two ways: for a new mode creation (a) or for * search the node which correspondes to the 'name' parameter (b). * In case (a) name should be set up to NULL and 'name_dir_entry' should * point to initialized 32 bytes structure described a new node. * In case (b) 'name' should contain a valid string. * * (a): reading fat-file corresponded to directory we are going to create * node in. If found free slot write contents of name_dir_entry into * it. * * (b): reading fat-file corresponded to directory and trying to find slot * with the name field == name parameter * * PARAMETERS: * mt_entry - mount table entry * fat_fd - fat-file descriptor * name - NULL or name to find * paux - identify a node location on the disk - * number of cluster and offset inside the cluster * name_dir_entry - node to create/placeholder for found node * * RETURNS: * RC_OK on success, or error code if error occured (errno set * appropriately) * */ int msdos_find_name_in_fat_file( rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd, char *name, fat_auxiliary_t *paux, char *name_dir_entry ) { int rc = RC_OK; ssize_t ret = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned32 i = 0, j = 0; unsigned32 bts2rd = 0; if (FAT_FD_OF_ROOT_DIR(fat_fd) && (fs_info->fat.vol.type & (FAT_FAT12 | FAT_FAT16))) bts2rd = fat_fd->fat_file_size; else bts2rd = fs_info->fat.vol.bpc; while ((ret = fat_file_read(mt_entry, fat_fd, (j * bts2rd), bts2rd, fs_info->cl_buf)) != FAT_EOF) { if (ret < MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) set_errno_and_return_minus_one(EIO); assert(ret == bts2rd); for (i = 0; i < bts2rd; i += MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) { /* is the entry empty ? */ if (((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY) || ((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_EMPTY)) { /* whether we are looking for an empty entry */ if (name == NULL) { /* get current cluster number */ rc = fat_file_ioctl(mt_entry, fat_fd, F_CLU_NUM, j * bts2rd, &paux->cln); if (rc != RC_OK) return rc; /* offset is computed in bytes */ paux->ofs = i; /* write new node entry */ ret = fat_file_write(mt_entry, fat_fd, j * bts2rd + i, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE, name_dir_entry); if (ret != MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) return -1; /* * we don't update fat_file_size here - it should not * increase */ return RC_OK; } /* * if name != NULL and there is no more entries in the * directory - return name-not-found */ if (((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY)) return MSDOS_NAME_NOT_FOUND_ERR; } else { /* entry not empty and name != NULL -> compare names */ if (name != NULL) { if (strncmp(MSDOS_DIR_NAME((fs_info->cl_buf + i)), name, MSDOS_SHORT_NAME_LEN) == 0) { /* * we get the entry we looked for - fill auxiliary * structure and copy all 32 bytes of the entry */ rc = fat_file_ioctl(mt_entry, fat_fd, F_CLU_NUM, j * bts2rd, &paux->cln); if (rc != RC_OK) return rc; /* offset is computed in bytes */ paux->ofs = i; memcpy(name_dir_entry,(fs_info->cl_buf + i), MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); return RC_OK; } } } } j++; } return MSDOS_NAME_NOT_FOUND_ERR; } /* msdos_find_node_by_cluster_num_in_fat_file -- * Find node with specified number of cluster in fat-file. * * PARAMETERS: * mt_entry - mount table entry * fat_fd - fat-file descriptor * cl4find - number of cluster to find * paux - identify a node location on the disk - * cluster num and offset inside the cluster * dir_entry - placeholder for found node * * RETURNS: * RC_OK on success, or error code if error occured * */ int msdos_find_node_by_cluster_num_in_fat_file( rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd, unsigned32 cl4find, fat_auxiliary_t *paux, char *dir_entry ) { int rc = RC_OK; ssize_t ret = 0; msdos_fs_info_t *fs_info = mt_entry->fs_info; unsigned32 bts2rd = 0; unsigned32 i = 0, j = 0; if (FAT_FD_OF_ROOT_DIR(fat_fd) && (fs_info->fat.vol.type & (FAT_FAT12 | FAT_FAT16))) bts2rd = fat_fd->fat_file_size; else bts2rd = fs_info->fat.vol.bpc; while ((ret = fat_file_read(mt_entry, fat_fd, j * bts2rd, bts2rd, fs_info->cl_buf)) != FAT_EOF) { if ( ret < MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE ) set_errno_and_return_minus_one( EIO ); assert(ret == bts2rd); for (i = 0; i < bts2rd; i += MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) { /* if this and all rest entries are empty - return not-found */ if ((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY) return MSDOS_NAME_NOT_FOUND_ERR; /* if this entry is empty - skip it */ if ((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == MSDOS_THIS_DIR_ENTRY_EMPTY) continue; /* if get a non-empty entry - compare clusters num */ if (MSDOS_EXTRACT_CLUSTER_NUM((fs_info->cl_buf + i)) == cl4find) { /* on success fill aux structure and copy all 32 bytes */ rc = fat_file_ioctl(mt_entry, fat_fd, F_CLU_NUM, j * bts2rd, &paux->cln); if (rc != RC_OK) return rc; paux->ofs = i; memcpy(dir_entry, fs_info->cl_buf + i, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); return RC_OK; } } j++; } return MSDOS_NAME_NOT_FOUND_ERR; }