diff options
Diffstat (limited to 'int21dos.h')
| -rw-r--r-- | int21dos.h | 247 |
1 files changed, 245 insertions, 2 deletions
@@ -20,11 +20,50 @@ #ifndef INT21DOS_H #define INT21DOS_H +#include <stddef.h> #include <stdbool.h> +#include <stdint.h> #include <dos.h> +#include "utils.h" #define DOS_PSP_SIZE 256 +enum dos_error { + DOS_ERROR_SUCCESS = 0, + DOS_ERROR_INVALID_FUNCTION = 1, + DOS_ERROR_FILE_NOT_FOUND = 2, + DOS_ERROR_PATH_NOT_FOUND = 3, + DOS_ERROR_ERROR_TOO_MANY_OPEN_FILES = 4, + DOS_ERROR_ACCESS_DENIED = 5, + DOS_ERROR_INVALID_HANDLE = 6, + DOS_ERROR_ARENA_TRASHED = 7, + DOS_ERROR_NOT_ENOUGH_MEMORY = 8, + DOS_ERROR_INVALID_BLOCK = 9, + DOS_ERROR_BAD_ENVIRONMENT = 10, + DOS_ERROR_BAD_FORMAT = 11, + DOS_ERROR_INVALID_ACCESS = 12, + DOS_ERROR_INVALID_DATA = 13, + DOS_ERROR_OUT_OF_MEMORY = 14, + DOS_ERROR_INVALID_DRIVE = 15, + DOS_ERROR_CURRENT_DIRECTORY = 16, + DOS_ERROR_OT_SAME_DEVICE = 17, + DOS_ERROR_NO_MORE_FILES = 18, + DOS_ERROR_WRITE_PROTECT = 19, + DOS_ERROR_BAD_UNIT = 20, + DOS_ERROR_NOT_READY = 21, + DOS_ERROR_BAD_COMMAND = 22, + DOS_ERROR_CRC = 23, + DOS_ERROR_BAD_LENGTH = 24, + DOS_ERROR_SEEK = 25, + DOS_ERROR_NOT_DOS_DISK = 26, + DOS_ERROR_SECTOR_NOT_FOUND = 27, + + DOS_ERROR_GEN_FAILURE = 31, + + DOS_ERROR_HANDLE_EOF = 38, + DOS_ERROR_HANDLE_DISK_FULL = 39, +}; + enum dos_allocation_strategy { DOS_FIT_FIRST = 0, DOS_FIT_BEST = 1, @@ -34,6 +73,14 @@ enum dos_allocation_strategy { DOS_FIT_HIGHONLY = 0x40, }; +typedef __segment segment_t; + +/** Converts bytes to paragraphs (16 bytes), rounding up. */ +static inline unsigned get_paragraphs(unsigned bytes) +{ + return (bytes + 15) / 16; +} + static unsigned dos_query_allocation_strategy(void); #pragma aux dos_query_allocation_strategy = \ "mov ax, 0x5800" \ @@ -82,7 +129,7 @@ static __segment dos_alloc(unsigned paragraphs); __value [ax] /** Frees DOS segment. */ -static void dos_free(_segment segment); +static void dos_free(segment_t segment); #pragma aux dos_free = \ "mov ah, 0x49" \ "int 0x21" \ @@ -90,11 +137,207 @@ static void dos_free(_segment segment); __modify [ax] /** Sets a given PSP as the current active process. */ -static void dos_set_psp(_segment psp); +static void dos_set_psp(segment_t psp); #pragma aux dos_set_psp = \ "mov ah, 0x50" \ "int 0x21" \ __parm [bx] \ __modify [ax] +// Internal DOS structures + +// For documentation of these, better grab "Undocumented DOS" or similar book +// These are probably valid only on DOS >= 4 + +typedef _Packed struct dos_current_directory_structure { + char curr_path[67]; + uint16_t flags; + uint32_t disk_blk; + void __far * info; + char pad1[11]; +} DOSCDS; +STATIC_ASSERT(sizeof(DOSCDS) == 88); + +enum dos_cds_flags { + DOS_CDS_FLAG_PHYSICAL = 0x4000, + DOS_CDS_FLAG_NETWORK = 0x8000 +}; + +typedef _Packed struct dos_system_file_table_entry { + uint16_t num_handles; + uint16_t open_mode; + uint8_t attr; + uint16_t dev_info; + void __far *dpb; + uint16_t start_cluster; + uint16_t f_time; + uint16_t f_date; + uint32_t f_size; + uint32_t f_pos; + uint16_t last_rel_cluster; + uint16_t last_abs_cluster; + uint16_t dir_sector; + uint8_t dir_entry; + char filename[11]; +} DOSSFT; +STATIC_ASSERT(sizeof(DOSSFT) == 43); + +typedef _Packed struct dos_search_data_block { + char drive_letter; + char search_templ[11]; + uint8_t search_attr; + uint16_t dir_entry; + uint16_t par_clstr; + char pad1[4]; +} DOSSDB; +STATIC_ASSERT(sizeof(DOSSDB) == 21); + +typedef _Packed struct dos_direntry { + char filename[11]; + uint8_t attr; + char pad1[10]; + uint16_t f_time; + uint16_t f_date; + uint16_t start_cluster; + uint32_t f_size; +} DOSDIR; +STATIC_ASSERT(sizeof(DOSDIR) == 32); + +typedef _Packed struct dos_swappable_area { + uint8_t criterr; + uint8_t indos; + uint8_t drive_num; + uint8_t lasterr_dum[9]; + uint8_t __far *cur_dta; + uint16_t cur_psp; + uint8_t pad1[4]; + uint8_t cur_drive; + uint8_t pad2[135]; + char fn1[128]; + char fn2[128]; + DOSSDB sdb; + DOSDIR found_file; + DOSCDS drive_cdscopy; + uint8_t fcb_fn1[11]; + uint8_t pad3[1]; + uint8_t fcb_fn2[11]; + uint8_t pad4[11]; + uint8_t search_attr; + uint8_t open_mode; + uint8_t pad5[51]; + DOSCDS __far *drive_cds; + uint8_t pad6[12]; + uint16_t fn1_csoffset; + uint16_t fn2_csoffset; + uint8_t pad7[71]; + uint16_t openex_act; + uint16_t openex_attr; + uint16_t openex_mode; + uint8_t pad8[29]; + DOSSDB rename_srcfile; + DOSDIR rename_file; +} DOSSDA; +STATIC_ASSERT(offsetof(DOSSDA, cur_dta) == 0xC); +STATIC_ASSERT(offsetof(DOSSDA, cur_drive) == 0x16); +STATIC_ASSERT(offsetof(DOSSDA, fn1) == 0x9E); +STATIC_ASSERT(offsetof(DOSSDA, fn2) == 0x11E); +STATIC_ASSERT(offsetof(DOSSDA, sdb) == 0x19E); +STATIC_ASSERT(offsetof(DOSSDA, found_file) == 0x1B3); +STATIC_ASSERT(offsetof(DOSSDA, search_attr) == 0x24D); +STATIC_ASSERT(offsetof(DOSSDA, open_mode) == 0x24E); +STATIC_ASSERT(offsetof(DOSSDA, drive_cds) == 0x282); +STATIC_ASSERT(offsetof(DOSSDA, openex_act) == 0x2DD); +STATIC_ASSERT(offsetof(DOSSDA, openex_mode) == 0x2E1); + +typedef _Packed struct dos_list_of_lists { + char pad1[22]; + DOSCDS __far *cds; + char pad2[7]; + uint8_t last_drive; +} DOSLOL; + +static inline int drive_letter_to_index(char letter) +{ + if (letter >= 'A' && letter <= 'Z') return letter - 'A'; + else if (letter >= 'a' && letter <= 'z') return letter - 'a'; + else return -1; +} + +static inline char drive_index_to_letter(int index) +{ + return 'A' + index; +} + +static inline DOSSDA __far * dos_get_swappable_dos_area(void); +#pragma aux dos_get_swappable_dos_area = \ + "push ds" \ + "mov ax, 0x5D06" \ + "int 0x21" \ + "jnc success" \ + "xor si, si" \ + "mov es, si" \ + "jmp end" \ + "success: mov ax, ds" \ + "mov es, ax" \ + "end: pop ds" \ + __value [es si] \ + __modify [ax cx dx] + +static inline DOSLOL __far * dos_get_list_of_lists(void); +#pragma aux dos_get_list_of_lists = \ + "mov ax, 0x5200" \ + "int 0x21" \ + __value [es bx] \ + __modify [ax] + +// Network redirector interface + +enum DOS_REDIR_SUBFUNCTION { + DOS_FN_RMDIR = 0x01, + DOS_FN_MKDIR = 0x03, + DOS_FN_CHDIR = 0x05, + DOS_FN_CLOSE = 0x06, + DOS_FN_COMMIT = 0x07, + DOS_FN_READ = 0x08, + DOS_FN_WRITE = 0x09, + DOS_FN_LOCK = 0x0A, + DOS_FN_UNLOCK = 0x0B, + DOS_FN_GET_DISK_FREE = 0x0C, + DOS_FN_SET_FILE_ATTR = 0x0E, + DOS_FN_GET_FILE_ATTR = 0x0F, + DOS_FN_RENAME = 0x11, + DOS_FN_DELETE = 0x13, + DOS_FN_OPEN = 0x16, + DOS_FN_CREATE = 0x17, + DOS_FN_FIND_FIRST = 0x1B, + DOS_FN_FIND_NEXT = 0x1C, + DOS_FN_CLOSE_ALL = 0x1D, + DOS_FN_DO_REDIR = 0x1E, + DOS_FN_PRINTSETUP = 0x1F, + DOS_FN_FLUSH = 0x20, + DOS_FN_SEEK_END = 0x21, + DOS_FN_QUALIFY = 0x23, + DOS_FN_OPEN_EX = 0x2E +}; + +enum OPENEX_ACTIONS { + OPENEX_FAIL_IF_EXISTS = 0x0000, + OPENEX_OPEN_IF_EXISTS = 0x0001, + OPENEX_REPLACE_IF_EXISTS = 0x0002, + OPENEX_FAIL_IF_NEW = 0x0000, + OPENEX_CREATE_IF_NEW = 0x0100, +}; + +enum OPENEX_MODE { + OPENEX_MODE_READ = 0, + OPENEX_MODE_WRITE = 1, + OPENEX_MODE_RDWR = 2 +}; + +enum OPENEX_RESULT { + OPENEX_FILE_OPENED = 1, + OPENEX_FILE_CREATED = 2, + OPENEX_FILE_REPLACED = 3, +}; + #endif // INT21DOS_H |