C Programming Cheatsheet Page 3
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4C Programming Cheatsheet
Type Attributes
complex float-point
<locale.h> - Category macros
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HC - Half Complex; 2 byte half-precision complex
<math.h> - Mathematical and trigonometric functions
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GNU-GCC only
float-point
<monetary.h> - Monetary unit string formatting
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SC - Single Complex; 4 byte single-precision complex
<mqueue.h> - Message queue
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Attributes.html
float-point
<ndbm.h> - NDBM database operations
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aligned - Set alignment
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DC - Double Complex; 8 byte double-precision
<net/if.h> - List local network interfaces
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deprecated - Emit warning msg when called
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complex float-point
<netdb.h> - Translating protocol and hostnames into
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mode - Set type mode. Example: typedef
XC - Extended Complex; 12 byte extended-precision
numeric addresses
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complex float-point
<netinet/in.h> - Internet protocol and address family
_Complex float
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TC - Tetra Complex; 16 byte tetra-precision complex
definitions
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__attribute((mode(TC))) _Complex128;
float-point
<netinet/tcp.h> - Additional TCP control options
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packed - Members of a struct or union are
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QQ - Quarter-Fractional; 1-byte
<nl_types.h> - Localization message catalog
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placed to minimize the memory required
HQ - Half-Fractional; 2-byte
functions
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unused - Inform the compiler that members of
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SQ - Single-Fractional; 4-byte
<poll.h> - Asynchronous file descriptor multiplexing
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a struct or union may appear unused; i.e. the
DQ - Double-Fractional; 8-byte
<pthread.h> - API for creating and manipulating
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compiler will not issue warnings
TQ - Tetra-Fractional; 16-byte
POSIX threads
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UQQ - Unsigned Quarter-Fractional; 1-byte
<pwd.h> - passwd and user information access and
Variable Attributes
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UHQ - Unsigned Half-Fractional; 2-byte
control
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GNU-GCC only
USQ - Unsigned Single-Fractional; 4-byte
<regex.h> - Regular expression matching
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UDQ - Unsigned Double-Fractional; 8-byte
<sched.h> - Execution scheduling
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Attributes.html
UTQ - Unsigned Tetra-Fractional; 16-byte
<search.h> - Search tables
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aligned - Set alignment
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HA - Half-Accumulator; 2-byte
<semaphore.h> - POSIX semaphores
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common - Place variable in "common"
SA - Single-Accumulator; 4-byte
<setjmp.h> - Stack environment declarations
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DA - Double-Accumulator; 8-byte
<signal.h> - Signals
storage; the common section of an object-file
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TA - Tetra-Accumulator; 16-byte
<spawn.h> - Process spawning
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deprecated - Emit warning msg when called
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UHA - Unsigned Half-Accumulator; 2-byte
<stdarg.h> - Handle Variable Argument List
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nocommon - Allocate space for the variable
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USA - Unsigned Single-Accumulator; 4-byte
<stdbool.h> - Boolean type and values
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directly
UDA - Unsigned Double-Accumulator; 8-byte
<stddef.h> - Standard Type Definitions
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unused - Inform the compiler that members of
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UTA - Unsigned Tetra-Accumulator; 16-byte
<stdint.h> - Integer Types
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a struct or union may appear unused, but that is
CC - Condition Code
<stdio.h> - Standard Buffered I/O
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fine; i.e. the compiler will not issue warnings
BLK - Block
<stdlib.h> - Standard Library Definitions
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vector_size - Set the variable's size in bytes
VOID - Void
<string.h> - Several String Operations
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P - Address mode
<strings.h> - Case-insensitive string comparisons
and then divide it into parts; A size of 4 and a type
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V4SI - Vector; 4 single integers
<stropts.h> - Stream manipulation and ioctl
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of "char" would make the variable contain four
V8QI - Vector; 8 single-byte integers
<sys/ipc.h> - Inter-process communication (IPC)
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"char" values
BND32 - 32-bit pointer bound
<sys/mman.h> - Memory management, POSIX
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Special Macros and Keywords
BND64 - 32-bit pointer bound
Shared Memory, and Memory-mapped files
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__asm__ - Inline assembly code
<sys/msg.h> - POSIX message queues
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<sys/resource.h> - Resource usage, priorities, and
Printing Width-based Integrals
__attribute__ - Function attribute
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limiting
__auto_type - Duck typing
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Datatype
Print Macros
<sys/select.h> - Synchronous I/O multiplexing
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__extension__ - Inform compiler that the
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<sys/sem.h> - XSI (SysV style) semaphores
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following code is a GCC extension
int8_t
PRId8
<sys/shm.h> - XSI (SysV style) Shared Memory
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_Generic - Type-polymorphism mechanism
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<sys/socket.h> - Main Berkley sockets header
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uint8_t
PRIu8
__GNUC__ - GNU-GCC compiler
<sys/stat.h> - File information
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__label__ - Create a local label by declaring it
int16_t
PRId16
<sys/statvfs.h> - Filesystem information
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<sys/time.h> - Time and date functions and structures
in the beginning of the scope (__label__ label;);
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uint16_t
PRIu16
<sys/times.h> - File access and modification times
then, place the actual label where needed (label:;)
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<sys/types.h> - Various data-types
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uint64_t
PRIu64
__restrict__ - There is only one pointer to the
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<sys/uio.h> - Vectored I/O operations
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referenced object; Example: int FUNC(char
intmax_t
PRIdMAX
<sys/un.h> - Unix domain sockets
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*__restrict__ DATA) {}
<sys/utsname.h> - Operating system info and uname
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int_least32_t
PRIdLEAST32
<sys/wait.h> - Status of terminated child processes
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&&label - Address of label
<syslog.h> - System error logging
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u int_fast32_t
PRIuFAST32
typeof(*x) y - Declare y with x's type
<tar.h> - Magic numbers for the tar archive format
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Machine Modes
intptr_t
PRIdPTR
<termios.h> - Terminal I/O interfaces
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<tgmath.h> - Type-Generic math macros
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BI - 1 Bit
Replace "PRI" with "SCN" in scanf()
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<time.h> - Time macros
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QI - Quarter Integer; 1 byte
C POSIX Library
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<trace.h> - Tracing of runtime behavior
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HI - Half Integer; 2 bytes
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<aio.h> - Asynchronous I/O
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<ulimit.h> - Resource limiting (DEPRECATED; use
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PSI - Partial Single Integer; 4 bytes; not all bits used
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<arpa/inet.h> - Functions for manipulating numeric IP
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<sys/resource.h>)
SI - Single Integer; 4 bytes
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addresses (part of Berkeley sockets)
<unistd.h> - Various POSIX functions and constants
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PDI - Partial Double Integer; 8 bytes; not all bits used
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<assert.h> - Macros assertions
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<utime.h> - Inode access and modification times
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DI - Double Integer; 8 bytes
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<complex.h> - Arithmetic with complex numbers
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<utmpx.h> - User accounting database functions
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TI - Tetra Integer; 16 bytes
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<cpio.h> - Magic numbers for the cpio archive format
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<wchar.h> - Wide-Character handling
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OI - Octa Integer; 32 bytes
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<dirent.h> - Functions for opening and listing
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<wctype.h> - Wide-Character classification and
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QF - Quarter Floating; 1 byte quarter-precision float-
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directories
mapping utilities
point
<dlfcn.h> - Dynamic linking
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<wordexp.h> - Word-expansion
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HF - Half Floating; 2 byte half-precision float-point
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<errno.h> - Retrieving Error Number
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TQF - Three Quarter Floating; 3 byte three-quarter-
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<fcntl.h> - File opening, locking, and other file
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precision float-point
operations
SF - Single Floating; 4 byte single-precision float-
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<fenv.h> - Floating-Point environment
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point
<float.h> - Floating Types
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DF - Double Floating; 8 byte double-precision float-
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<fmtmsg.h> - Message display structures
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point
<fnmatch.h> - Filename matching
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XF - Extended Floating; 12 byte extended-precision
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<ftw.h> - File tree traversal
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float-point
<glob.h> - Pathname pattern-matching (globbing)
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TF - Tetra Floating; 16 byte tetra-precision float-point
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<grp.h> - User group information and control
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CQI - Complex Quarter Integer; 1 byte
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<iconv.h> - Codeset conversion facility
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CHI - Complex Half Integer; 2 bytes
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<inttypes.h> - Fixed-size integer data-types
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CSI - Complex Single Integer; 4 bytes
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<iso646.h> - Alternative spellings
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CDI - Complex Double Integer; 8 bytes
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<langinfo.h> - Language information constants
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CTI - Complex Tetra Integer; 16 bytes
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<libgen.h> - Pathname manipulation
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COI - Complex Octa Integer; 32 bytes
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<limits.h> - Implementation-defined constants
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QC - Quarter Complex; 1 byte quarter-precision
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Created by Devyn Collier Johnson <DevynCJohnson@Gmail.com> (2017) More cheatsheets at DCJTech.info
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