Constants
This chapter describes constants (defined names) and their values.The values of defined names in this chapter are provided for reference only; they may change in future releases. They are especially valuable when debugging, when the name might not be available.
_access Mode Values
Declared in: io.h| Name | Value | Meaning |
|---|
_bios_disk Service Values
Declared in: bios.h| Name | Value | Meaning |
|---|---|---|
| _DISK_RESET | 0 | Hard reset |
| _DISK_STATUS | 1 | Retrieve status |
| _DISK_READ | 2 | Read sectors |
| _DISK_WRITE | 3 | Write sectors |
| _DISK_VERIFY | 4 | Verify disk readability |
| _DISK_FORMAT | 5 | Format track |
_bios_keybrd Service Values
Declared in: bios.h| Name | Value | Meaning |
|---|---|---|
| _KEYBRD_READ | 0x00 | Keyboard read |
| _KEYBRD_READY | 0x01 | Is keystroke available? |
| _KEYBRD_SHIFTSTATUS | 0x02 | Retrieve shift key status |
| _NKEYBRD_READ | 0x10 | Enhanced read |
| _NKEYBRD_READY | 0x11 | Enhanced ready |
| _NKEYBRD_SHIFTSTATUS | 0x12 | Enhanced shift status |
_bios_printer Service Values
Declared in: bios.h| Name | Value | Meaning |
|---|---|---|
| _PRINTER_WRITE | 0 | Write data to printer |
| _PRINTER_INIT | 1 | Initialize printer |
| _PRINTER_STATUS | 2 | Retrieve printer status |
_bios_serialcom Service Values
Declared in: bios.h| Name | Value | Meaning |
|---|---|---|
| _COM_INIT | 0 | Initialize port |
| _COM_SEND | 1 | Send data |
| _COM_RECEIVE | 2 | Receive data |
| _COM_STATUS | 3 | Request status |
_bios_serialcom Data Values
Declared in: bios.h| Name | Value | Meaning |
|---|---|---|
| _COM_110 | 0x00 | 110 baud |
| _COM_NOPARITY | 0x00 | No parity |
| _COM_STOP1 | 0x00 | 1 stop bit |
| _COM_CHR7 | ` 0x02 | 7 data bits |
| _COM_CHR8 | 0x03 | 8 data bits |
| _COM_STOP2 | 0x04 | 2 stop bits |
| _COM_ODDPARITY | 0x08 | Odd parity |
| _COM_EVENPARITY | 0x18 | Even parity |
| _COM_150 | 0x20 | 150 baud |
| _COM_300 | 0x40 | 300 baud |
| _COM_600 | 0x60 | 600 baud |
| _COM_1200 | 0x80 | 1200 baud |
| _COM_2400 | 0xa0 | 2400 baud |
| _COM_4800 | 0xc0 | 4800 baud |
| _COM_9600 | 0xe0 | 9600 baud |
_bios_timeofday Service Values
Declared in: bios.h| Name | Value | Meaning |
|---|---|---|
| _TIME_GETCLOCK | 0 | Retrieve time |
| _TIME_SETCLOCK | 1 | Set time |
clock Values
Declared in: time.h
To convert from ticks to seconds, divide the clock_t value
returned from the clock function by CLOCKS_PER_SEC.
| Name | Value | Meaning |
|---|---|---|
| CLOCKS_PER_SEC | 100 | Number of timer ticks per second |
| CLK_TCK | 100 | Synonym of CLOCKS_PER_SEC |
cpumode Values
Declared in: stdlib.h| Name | Value | Meaning |
|---|---|---|
| _REAL_MODE | 0 | Running in real mode |
| _PROT_MODE | 1 | Running in protected mode |
disp_setattr Display Attribute Values
Declared in: disp.h| Name | Value | Meaning |
|---|---|---|
| DISP_NONDISPLAY | 0x00 | Non-displaying attribute |
| DISP_UNDERLINE | 0x01 | Underline attribute |
| DISP_NORMAL | 0x07 | Normal attribute |
| DISP_INTENSITY | 0x08 | Intensity attribute |
| DISP-REVERSEVIDEO | 0x70 | Reverse video attribute |
| DISP_BLINK | 0x80 | Blink attribute |
disp_setcursortype Standard Cursor Types
Declared in: disp.hFor monochrome/ color values:
| Name | Value | Meaning |
|---|---|---|
| DISP_CURSORBLOCK | 0x000c/0x0007 | Block cursor |
| DISP_CURSORHALF | 0x060c/0x0307 | Half cursor |
| DISP_CURSORUL | 0x0b0c/0x0707 | Underline cursor |
EMM Page Size
Declared in: emm.h| Name | Value | Meaning |
|---|
errno Values
Declared in: errno.h and other header files| Name | Value | Meaning |
|---|---|---|
| EZERO | 0 | No error |
| EPERM | 1 | Operation not permitted |
| ENOENT | 2 | No such file or directory |
| ESRCH | 3 | No such process |
| EINTR | 4 | Interrupted function call |
| EIO | 5 | Input/ output error |
| ENXIO | 6 | No such device or address |
| E2BIG | 7 | Argument list too long |
| ENOEXEC | 8 | Exec format error |
| EBADF | 9 | Bad file descriptor |
| ECHILD | 10 | No child processes |
| EAGAIN | 11 | Resource temporarily unavailable |
| ENOMEM | 12 | Not enough space |
| EACCES | 13 | Permission denied |
| EFAULT | 14 | Bad address |
| EBUSY | 16 | Resource device |
| EEXIST | 17 | File exists |
| EXDEV | 18 | Improper link |
| ENODEV | 19 | No such device |
| ENOTDIR | 20 | Not a directory |
| EISDIR | 21 | Is a directory |
| EINVAL | 22 | Invalid argument |
| ENFILE | 23 | Too many open files in system |
| EMFILE | 24 | Too many open files |
| ENOTTY | 25 | Inappropriate I/ O control operation |
| EFBIG | 27 | File too large |
| ENOSPC | 28 | No space left on device |
| ESPIPE | 29 | Invalid seek |
| EROFS | 30 | Read-only file system |
| EMLINK | 31 | Too many links |
| EPIPE | 32 | Broken pipe |
| EDOM | 33 | Domain error |
| ERANGE | 34 | Result too large |
| EDEADLK | 36 | Resource deadlock avoided |
| EDEADLOCK | 36 | Synonym of EDEADLK |
| ENAMETOOLONG | 38 | Filename too long |
| ENOLCK | 39 | No locks available |
| ENOSYS | 40 | Function not implemented |
| ENOTEMPTY | 41 | Directory not empty |
| EILSEQ | 42 | Illegal byte sequence |
exit ANSI-Standard Return Values
Declared in: stdlib.h| Name | Value | Meaning |
|---|---|---|
| EXIT_SUCCESS | 0 | Successful termination |
| EXIT_FAILURE | 1 | Unsuccessful termination |
File Attributes
Declared in: dos.h
Several functions,, including _dos_creat and _dos_findfirst,
use these attributes. Note that some values, which can be used when
searching, cannot be used when creating a file. Examples are
_A_VOLID and _A_SUBDIR: a volume ID or a subdirectory cannot
be created with _dos_creat, only a file can be created.
| Name | Value | Meaning |
|---|---|---|
| _A_NORMAL | 0x00 | Normal file |
| _A_RDONLY | 0x01 | Read-only file |
| _A_HIDDEN | 0x02 | Hidden file |
| _A_SYSTEM | 0x04 | System file |
| _A_VOLID | 0x08 | Volume ID |
| _A_SUBDIR | 0x10 | Subdirectory |
| _A_ARCH | 0x20 | File changed since last archive |
| FA_NORMAL | 0x00 | Synonym of _A_NORMAL |
| FA_RDONLY | 0x01 | Synonym of _A_RDONLY |
| FA_HIDDEN | 0x02 | Synonym of _A_HIDDEN |
| FA_SYSTEM | 0x04 | Synonym of _A_SYSTEM |
| FA_LABEL | 0x08 | Synonym of _A_VOLID |
| FA_DIREC | 0x10 | Synonym of _A_SUBDIR |
| FA_ARCH | 0x20 | Synonym of _A_ARCH |
Floating-Point Number Classifications
Declared in: fltpnt.h| Name | Value | Meaning |
|---|---|---|
| FP_NANS | 0 | Signaling NaN |
| FP_NANQ | 1 | Quiet NaN |
| FP_INFINITE | 2 | Infinity |
| FP_NORMAL | 3 | Any number not covered by other classifications |
| FP_SUBNORMAL | 4 | Subnormal or denormal |
| FP_ZERO | 5 | Zero |
Floating-Point Exceptions
Declared in: fltenv.h| Name | Value | Meaning |
|---|---|---|
| FE_INVALID | 0x01 | Invalid operand or operation |
| FE_DIVBYZERO | 0x04 | Divide by zero |
| FE_OVERFLOW | 0x08 | Overflow |
| FE_UNDERFLOW | 0x10 | Underflow |
| FE_INEXACT | 0x20 | Inexact result |
| FE_ALL_EXCEPT | 0x3F | All exceptions |
Floating-Point Precision Values
Declared in: fltenv.h| Name | Value | Meaning |
|---|---|---|
| FE_FLTPREC | 0x0000 | Use float (32-bit) precision |
| FE_DBLPREC | 0x0200 | Use double (64-bit) precision |
| FE_LDBLPREC | 0x0300 | Use long double (80-bit) precision |
Floating-Point Rounding Values
Declared in: fltenv.h| Name | Value | Meaning |
|---|---|---|
| FE_TONEAREST | 0x0000 | Round to nearest value |
| FE_DOWNWARD | 0x0400 | Round toward negative infinity |
| FE_UPWARD | 0x0800 | Round toward positive infinity |
| FE_TOWARDZERO | 0x0c00 | Round toward zero (drop fractional part) |
Floating-Point Special Values
Declared in: fltenv.h| Name | Meaning |
|---|---|
| INFINITY | The value of positive infinity |
| NAN | The value of a quiet NaN |
| NANS | The value of a signaling NaN |
Floating-Point Characteristic Constants
Declared in: float.h| Name | Value | Meaning |
|---|---|---|
| DBL_MIN_EXP | -1021 | Smallest exponent value for a double, using base FLT_RADIX |
| LDBL_MIN_EXP | -1021 | Smallest exponent value for a long double, using base FLT_RADIX |
| DBL_DIG | 15 | Number of decimal digits accurately represented by a double |
| DBL_EPSILON | 2.2204460492501131e-16 | Smallest difference between two doubles |
| DBL_MANT_DIG | 53 | Number of base-FLT_RADIX digits in the significand of a double (number of binary digits in the significand) |
| DBL_MAX | 1.7976931348623157e+308 | Largest positive value represented by a double |
| DBL_MAX_10_EXP | 308 | Largest exponent for a double, using base 10 |
| DBL_MAX_EXP | 1024 | Largest exponent value for a double, using base FLT_RADIX |
| DBL_MIN | 2.225073855072014e-308 | Smallest positive value represented by a double |
| DBL_MIN_10_EXP | -307 | Smallest exponent for a double, using base 10 |
| FLT_DIG | 6 | Number of decimal digitals represented by a float |
| FLT_EPSILON | 1.1920929e-7f | Smallest difference between two floats |
| FLT_MANT_DIG | 24 | Number of base FLT_RADIX digits in significand of float (number of binary digits in significand) |
| FLT_MAX | 3.402823466e+38F | Largest positive value represented by a float |
| FLT_MAX_10_EXP | 38 | Largest exponent value for a float, using base 10 |
| FLT_MAX_EXP | 128 | Largest exponent value for a float, using base FLT_RADIX |
| FLT_MIN | 1.175494351e-38 | Smallest positive value represented by a float |
| FLT_MIN_10_EXP | -37 | Smallest exponent value for a float, using base 10 |
| FLT_MIN_EXP | -125 | Smallest exponent value for a float, using base FLT_RADIX |
| FLT_RADIX | 2 | Radix used to represent floating point numbers |
| LDBL_DIG | 15 | Number of decimal digits represented by a long double |
| LDBL_EPSILON | 2.2204460492501131e-16 | Smallest difference between two long doubles |
| LDBL_MANT_DIG | 53 | Number of base FLT_RADIX digits in significand of a long double (number of binary digits in significand) |
| LDBL_MAX | 1.7976931348623157e+308 | Largest positive value represented by a long double |
| LDBL_MAX_10_EXP | 308 | Largest exponent value for a long double, using base 10 |
| LDBL_MAX_EXP | 1024 | Largest exponent value for a long double, using base FLT_RADIX |
| LDBL_MIN | 2.2250738585072014e-308 | Smallest positive value represented by a long double |
| LDBL_MIN_10_EXP | -307 | Smallest exponent value for a long double, using base 10 |
fnsplit Return Values
Declared in: dir.h| Name | Value | Meaning |
|---|---|---|
| EXTENSION | 0x02 | An extension was found |
| FILENAME | 0x04 | A filename was found |
| DIRECTORY | 0x08 | A directory was found |
| DRIVE | 0x10 | A drive was found |
fnsplit Maximum Size of Components
Declared in: dir.h| Name | Value | Meaning |
|---|---|---|
| MAXDRIVE | 3 | Largest drive identifier |
| MAXEXT | 5 | Largest extension |
| MAXFILE | 6 | Largest filename |
| MAXDIR | 66 | Largest directory name |
| MAXPATH | 80 | Largest pathname |
_getch and _getche Extended Key Codes
Declared in: conio.h
To return a key with no ASCII value, such as a function key, _getch
returns a 0 or 0xe0 followed by one of these codes:
| Name | Value | Meaning |
|---|---|---|
| _KB_BACK_TAB | 15 | Backtab |
| _KB_F1 | 59 | F1 |
| _KB_F2 | 60 | F2 |
| _KB_F3 | 61 | F3 |
| _KB_F4 | 62 | F4 |
| _KB_F5 | 63 | F5 |
| _KB_F6 | 64 | F6 |
| _KB_F7 | 65 | F7 |
| _KB_F8 | 66 | F8 |
| _KB_F9 | 67 | F9 |
| _KB_F10 | 68 | F10 |
| _KB_HOME | 71 | Home |
| _KB_UP | 72 | Up arrow |
| _KB_PGUP | 73 | Page up |
| _KB_LEFT | 75 | Left arrow |
| _KB_RIGHT | 77 | Right arrow |
| _KB_END | 79 | End |
| _KB_DOWN | 80 | Down arrow |
| _KB_PGDN | 81 | Page down |
| _KB_INS | 82 | Insert |
| _KB_DEL | 83 | Delete |
| _KB_SF1 | 84 | Shift-F1 |
| _KB_SF2 | 85 | Shift-F2 |
| _KB_SF3 | 86 | Shift-F3 |
| _KB_SF4 | 87 | Shift-F4 |
| _KB_SF5 | 88 | Shift-F5 |
| _KB_SF6 | 89 | Shift-F6 |
| _KB_SF7 | 90 | Shift-F7 |
| _KB_SF8 | 91 | Shift-F8 |
| _KB_SF9 | 92 | Shift-F9 |
| _KB_SF10 | 93 | Shift-F10 |
| _KB_CF1 | 94 | Control-F1 |
| _KB_CF2 | 95 | Control-F2 |
| _KB_CF3 | 96 | Control-F3 |
| _KB_CF4 | 97 | Control-F4 |
| _KB_CF5 | 98 | Control-F5 |
| _KB_CF6 | 99 | Control-F6 |
| _KB_CF7 | 100 | Control-F7 |
| _KB_CF8 | 101 | Control-F8 |
| _KB_CF9 | 102 | Control-F9 |
| _KB_CF10 | 103 | Control-F10 |
| _KB_AF1 | 104 | Alt-F1 |
| _KB_AF2 | 105 | Alt-F2 |
| _KB_AF3 | 106 | Alt-F3 |
| _KB_AF4 | 107 | Alt-F4 |
| _KB_AF5 | 108 | Alt-F5 |
| _KB_AF6 | 109 | Alt-F6 |
| _KB_AF7 | 110 | Alt-F7 |
| _KB_AF8 | 111 | Alt-F8 |
| _KB_AF9 | 112 | Alt-F9 |
| _KB_AF10 | 113 | Alt-F10 |
| _KB_CLEFT | 115 | Control-left arrow |
| _KB_CRIGHT | 116 | Control-right arrow |
| _KB_CEND | 117 | Control-end |
| _KB_CPGDN | 118 | Control-page down |
| _KB_CHOME | 119 | Control-home |
| _KB_A1 | 120 | Alt-1 |
| _KB_A2 | 121 | Alt-2 |
| _KB_A3 | 122 | Alt-3 |
| _KB_A4 | 123 | Alt-4 |
| _KB_A5 | 124 | Alt-5 |
| _KB_A6 | 125 | Alt-6 |
| _KB_A7 | 126 | Alt-7 |
| _KB_A8 | 127 | Alt-8 |
| _KB_A9 | 128 | Alt-9 |
| _KB_A0 | 129 | Alt-0 |
| _KB_AMINUS | 130 | Alt-minus |
| _KB_APLUS | 131 | Alt-plus |
| _KB_CPGUP | 132 | Control-page up |
_hardresume Result Codes
Declared in: dos.h| Name | Value | Meaning |
|---|---|---|
| _HARDERR_IGNORE | 0 | Ignore error |
| _HARDERR_RETRY | 1 | Retry operation |
| _HARDERR_ABORT | 2 | Abort program |
| _HARDERR_FAIL | 3 | Fail system call |
HUGE_VAL
Declared in: math.h| Name | Value | Meaning |
|---|---|---|
| HUGE_VAL | infinity | Double value represents overflow |
Integer Sizes
Declared in: limits.h| Name | Value | Meaning |
|---|---|---|
| CHAR_BIT | 8 | Number of bits in char |
| CHAR_MAX | 255 or 127 | Largest char, depends on sign |
| CHAR_MIN | 0 or -127 | Smallest char, depends on sign |
| INT_MAX | 2147483647 or 32767 | Largest int, depends on size |
| INT_MIN | -2147483647 or -32767 | Smallest int, depends on size |
| LONG_MAX | 2147483647 | Largest long |
| LONG_MIN | -2147483647 | Smallest long |
| MB_LEN_MAX | 2 | Longest multi-byte char |
| SCHAR_MAX | 127 | Largest signed char |
| SCHAR_MIN | -127 | Smallest signed char |
| SHRT_MAX | 32767 | Largest short |
| SHRT_MIN | -32767 | Smallest short |
| UCHAR_MAX | 255 | Largest unsigned char |
| UINT_MAX | 65535 or 4294967295 | Largest unsigned int, depends on size |
| USHRT_MAX | 65535 | Largest unsigned short |
_locking Mode Values
Declared in: sys\locking.h| Name | Value | Meaning |
|---|---|---|
| _LK_UNLCK | 0 | Unlock |
| _LK_LOCK | 1 | Lock with retry |
| _LK_NBLCK | 2 | Lock without retry |
| _LK_RLCK | 3 | Same as _LK_LOCK |
| _LK_NBRLCK | 4 | Same as _LK_NBLCK |
| LK_UNLCK | 0 | Synonym of _LK_UNLCK |
| LK_LOCK | 1 | Synonym of _LK_LOCK |
| LK_NBLCK | 2 | Synonym of _LK_NBLCK |
| LK_RLCK | 3 | Synonym of _LK_RLCK |
| LK_NBRLCK | 4 | Synonym of _LK_NBRLCK |
_matherr Exception Types
Declared in: math.h| Name | Value | Meaning |
|---|---|---|
| _DOMAIN | 1 | Domain error |
| _SIGN | 2 | Argument singularity |
| _OVERFLOW | 3 | Overflow range error |
| _UNDERFLOW | 4 | Result too small |
| _TLOSS | 5 | Total loss of significance |
| _PLOSS | 6 | Partial loss of significance |
| DOMAIN | 1 | Synonym of _DOMAIN |
| SING | 2 | Synonym of _SING |
| OVERFLOW | 3 | Synonym of _OVERFLOW |
| UNDERFLOW | 4 | Synonym of _UNDERFLOW |
| TLOSS | 5 | Synonym of _TLOSS |
| PLOSS | 6 | Synonym of _PLOSS |
Multi-byte Characters
Declared in: stdlib.h| Name | Value | Meaning |
|---|---|---|
| MB_CUR_MAX | 1 | Largest number of bytes in a multi-byte character for the current locale |
_open Flag Values
Declared in: fcntl.h| Name | Value | Meaning |
|---|---|---|
| _O_RDONLY | 0x0000 | Read from file only |
| _O_WRONLY | 0x0001 | Write to file only |
| _O_RDWR | 0x0002 | Read and write from file |
| _O_APPEND | 0x0008 | Write only at end of file |
| _O_CREAT | 0x0100 | Create the file |
| _O_TRUNC | 0x0200 | Truncate file |
| _O_EXCL | 0x0400 | Fail if file exists |
| _O_TEXT | 0x4000 | Use translated mode |
| _O_BINARY | 0x8000 | Use untranslated mode |
| O_RDONLY | 0x0000 | Synonym of _O_RDONLY |
| O_WRONLY | 0x0001 | Synonym of _O_WRONLY |
| O_RDWR | 0x0002 | Synonym of _O_RDWR |
| O_APPEND | 0x0008 | Synonym of _O_APPEND |
| O_CREAT | 0x0100 | Synonym of _O_CREAT |
| O_TRUNC | 0x0200 | Synonym of _O_TRUNC |
| O_EXCL | 0x0400 | Synonym of _O_EXCL |
| O_TEXT | 0x4000 | Synonym of _O_TEXT |
| O_BINARY | 0x8000 | Synonym of _O_BINARY |
| _O_RAW | 0x8000 | Synonym of _O_BINARY |
_osmode Values
Declared in: stdlib.h| Name | Value | Meaning |
|---|---|---|
| _DOS_MODE | 0 | DOS is running |
| _WIN_MODE | 2 | Windows is running |
Random Numbers
Declared in: stdlib.h| Name | Value | Meaning |
|---|---|---|
| RAND_MAX | 32767 | Largest number returned by the rand function |
Seek Origins
Declared in: io.h and stdio.hSeek origins are used by fseek and _lseek.
| Name | Value | Meaning |
|---|---|---|
| SEEK_SET | 0 | Seek relative to beginning of file |
| SEEK_CUR | 1 | Seek relative to current position |
| SEEK_END | 2 | Seek relative to end of file |
setlocal Categories
Declared in: locale.h| Name | Value | Meaning |
|---|---|---|
| LC_ALL | 0 | All categories |
| LC_COLLATE | 1 | Collating sequence |
| LC_CTYPE | 2 | Character types |
| LC_MONETARY | 3 | Monetary formatting |
| LC_NUMERIC | 4 | Number formatting |
| LC_TIME | 5 | Time formatting |
setvbuf Modes
Declared in: stdio.h| Name | Value | Meaning |
|---|---|---|
| _IOFBF | 0x0000 | Full buffering |
| _IONBF | 0x0004 | No buffering |
| _IOLBF | 0x0040 | Line buffering |
signal Codes
Declared in: signal.h| Name | Value | Meaning |
|---|---|---|
| SIGINT | 2 | Interrupt |
| SIGILL | 4 | Illegal instruction |
| SIGBREAK | 6 | Control-break |
| SIGFPE | 8 | Math error |
| SIGSEGV | 11 | Segmentation violation |
| SIGTERM | 15 | Program termination request |
| SIGABRT | 22 | Abnormal termination |
| NSIG | 23 | The number of signals |
signal Functions
Declared in: signal.h| Name | Value | Meaning |
|---|---|---|
| SIG_ERR | -1 | Signal could not be handled |
| SIG_DFL | 0 | Default signal handling |
| SIG_IGN | 1 | Ignore signal |
_sopen Sharing Flag Values
Declared in: share.h| Name | Value | Meaning |
|---|---|---|
| _SH_COMPAT | 0x00 | Compatibility mode |
| _SH_DENYRW | 0x10 | Deny all access while file is open |
| _SH_DENYWR | 0x20 | Deny write access while file is open |
| _SH_DENYRD | 0x30 | Deny read access while file is open |
| _SH_DENYNO | 0x40 | Allow read/ write access while file is open |
| SH_COMPAT | 0x00 | Synonym of _SH_COMPAT |
| SH_DENYRW | 0x10 | Synonym of _SH_DENYRW |
| SH_DENYWR | 0x20 | Synonym of _SH_DENYWR |
| SH_DENYRD | 0x30 | Synonym of _SH_DENYRD |
| SH_DENYNO | 0x40 | Synonym of _SH_DENYNO |
spawn Modes
Declared in: process.h| Name | Value | Meaning |
|---|---|---|
| _P_WAIT | 0 | Wait for child process to complate |
| _P_OVERLAY | 2 | Replace current process with child process |
| P_WAIT | 0 | Synonym of _P_WAIT |
| P_OVERLAY | 2 | Synonym of _P_OVERLAY |
_splitpath Buffer Sizes
Declared in: stdlib.h| Name | Value | Meaning |
|---|---|---|
| _MAX_DIR | 256 | Largest directory |
| _MAX_EXT | 256 | Largest extension |
| _MAX_FNAME | 256 | Largest filename |
| _MAX_PATH | 260 | Largest path |
| _MAX_DRIVE | 3 | Largest drive |
_stat st_mode Values
Declared in: sys\stat.h| Name | Value | Meaning |
|---|---|---|
| _S_IEXEC | 0x0040 | Handle refers to an executable file |
| _S_IWRITE | 0x0080 | Path or handle refers to a writable file |
| _S_IREAD | 0x0100 | Path or handle refers to a readable file |
| _S_IFCHR | 0x2000 | Handle refers to a character device |
| _S_IFDIR | 0x4000 | Path refers to a directory |
| _S_IFREG | 0x8000 | Path or handle refers to a regular file |
| S_IEXEC | 0x0040 | Synonym of _S_IEXEC |
| S_IREAD | 0x0100 | Synonym of _S_IREAD |
| S_IFCHR | 0x2000 | Synonym of _S_IFCHR |
| S_IFIDR | 0x4000 | Synonym of _S_IFDIR |
| S_IFREG | 0x8000 | Synonym of _S_IFREG |
stdio.h Miscellaneous Values
Declared in: stdio.h| Name | Value | Meaning |
|---|---|---|
| EOF | -1 | End of file value |
| FOPEN_MAX | 20 | Largest number of files that can be open at once |
| _NFILE | 40 or 60 | Number of file handles |
| FILENAME_MAX | 79 | Largest filename |
| BUFSIZ | 0x4000 | Size of a buffer used by setbuf |
Swap Error Codes
Declared in: swap.h| Name | Value | Meaning |
|---|---|---|
| SWAP_FREEMEMERROR | -2 | DOS refuses to shrink the primary memory block allocated for the program |
| SWAP_NOVMSPACE | -3 | Disk drive has no room to write program's image |
Temporary Files
Declared in: stdio.h| Name | Value | Meaning |
|---|---|---|
| P_tmpdir | "\\" | Directory used for temporary files by tmpnam function |
| L_tmpnam | 16 | Largest filename generated by tmpfile function |
| TMP_MAX | 32767 | Largest number of unique file names generated by tmpnam function |
tsr_install Arguments
Declared in: tsr.h| Name | Value | Meaning |
|---|---|---|
| TIMESLICE | 1 | Timeslice TSR |
| TSR_DEBUG | 2 | Debug TSR |
| POPONLY | Popup TSR |
TSR Scancodes
Declared in: tsr.h| Name | Value | Meaning |
|---|---|---|
| NO_SCAN | 0 | No scancode |
| RSHIFT | 1 | Right shift |
| LSHIFT | 2 | Left shift |
| CTRL | 4 | Control |
| ALT | 8 | Alt |
| SCAN_Q | 16 | Q |
| SCAN_W | 17 | W |
| SCAN_E | 18 | E |
| SCAN_R | 19 | R |
| SCAN_T | 20 | T |
| SCAN_Y | 21 | Y |
| SCAN_U | 22 | U |
| SCAN_I | 23 | I |
| SCAN_O | 24 | O |
| SCAN_P | 25 | P |
| SCAN_A | 30 | A |
| SCAN_S | 31 | S |
| SCAN_D | 32 | D |
| SCAN_F | 33 | F |
| SCAN_G | 34 | G |
| SCAN_H | 35 | H |
| SCAN_J | 36 | J |
| SCAN_K | 37 | K |
| SCAN_L | 38 | L |
| SCAN_Z | 44 | Z |
| SCAN_X | 45 | X |
| SCAN_C | 46 | C |
| SCAN_V | 47 | V |
| SCAN_B | 48 | B |
| SCAN_N | 49 | N |
| SCAN_M | 50 | M |
| SCAN_F1 | 59 | F1 |
| SCAN_F2 | 60 | F2 |
| SCAN_F3 | 61 | F3 |
| SCAN_F4 | 62 | F4 |
| SCAN_F5 | 63 | F5 |
| SCAN_F6 | 64 | F6 |
| SCAN_F7 | 65 | F7 |
| SCAN_F8 | 66 | F8 |
| SCAN_F9 | 67 | F9 |
| SCAN_F10 | 68 | F10 |