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The '''C library''' is a system library that contains common [[C]] language subroutines for file access, string operators, character operations, memory allocation, and other functions.
==Library Functions==
{|class="wikitable"
!Header||Function|| ||Extension
|-
|assert.h||assert||Diagnostic message
|-
|rowspan=6|complex.h|| ||Complex arithmetics||rowspan=6|C99
|-
|cacos, casin, catan, ccos, csin, ctan||Trigonometric
|-
|cacosh, casinh, catanh, ccosh, csinh, ctanh||Hyperbolic
|-
|cexp, clog||Exponential and logarithmic
|-
|cabs, cpow, csqrt||Power and absolute value
|-
|carg, cproj||Manipulation
|-
|rowspan=4|conio.h||_cgets||Character read||
|-
|_cprintf||Character print||
|-
|_cputs||String write||
|-
|_cscanf||Read from keyboard||
|-
|rowspan=14|ctype.h||isalnum||
|-
|isalpha||
|-
|isblank||
|-
|iscntrl||
|-
|isdigit||
|-
|isgraph||
|-
|islower||
|-
|isprint||
|-
|ispunct||
|-
|isspace||
|-
|isupper||
|-
|isxdigit||
|-
|tolower||
|-
|toupper||
|-
|rowspan=2|direct.h||chdir||Change directory||
|-
|_chdrive||Change drive||
|-
|errno.h|| ||Errors
|-
|fenv.h|| ||Floating point environment||C99
|-
|rowspan=2|iconv.h||iconv_close||Remove conversion description||XPG4
|-
|iconv_close||Create conversion description||XPG4
|-
|inttypes.h|| ||Integer types format conversion||C99
|-
|rowspan=16|io.h||access||Access mode determination
|-
|chmod||Change file permission
|-
|_chsize||Change file length
|-
|close||Close file handle
|-
|creat||Create file
|-
|dup||Duplicate file handle
|-
|dup2||Second handle for open file
|-
|__eof||End of file determination
|-
|_filelength||File length determination
|-
|isatty, _isatty||Character device determination||X/Open
|-
|lseek||File pointer movement
|-
|open||File open
|-
|read||File read
|-
|_tell||File pointer position
|-
|umask||File permission mask setting
|-
|write||Write from buffer to file
|-
|langinfo.h||nl_langinfo||Retrieve locale info||XPG4
|-
|locale.h||localeconv||Locale information from environment
|-
|rowspan=26|math.h||acos||Arccosine
|-
|asin||Arcsine
|-
|atan, atan2||Arctangent
|-
|_j0, j1, _jn<br />_y0, _y1, _yn||Bessel
|-
|ceil||Find integer greater or equal
|-
|cos||Cosine
|-
|cosh||Cosine hyperbolic
|-
|erf, erfc||Error functions
|-
|exp||Exponential
|-
|fabs||Absolute value of floating-point
|-
|floor||Find integer smaller or equal
|-
|fmod||Remainder of floating-point
|-
|frexp||Floating-point value separation
|-
|gamma||Gamma||SAA
|-
|hypot||Hypotenuse||
|-
|ldexp||Power of 2
|-
|log||Natural logarithm
|-
|log10||Decimal logarithm
|-
|_matherr||Math library error processing
|-
|modf||Floating-point value separation
|-
|pow||Power
|-
|sin||Sine
|-
|sinh||Sine hyperbolic
|-
|sqrt||Square root
|-
|tan||Tangent
|-
|tanh||Tangent hyperbolic
|-
|monetary.h||strfmon||Monetary value format||XPG4
|-
|rowspan=3|nl_types.h||catclose||Message catalogue close
|-
|catgets||Message catalogue retrieval
|-
|catgets||Message catalogue open
|-
|rowspan=2|process.h||_cwait||Child process wait
|-
|execl||Child process execution
|-
|search.h||lfind||Find key in array
|-
|rowspan=21|stdio.h||clearerr||Error indicator reset
|-
|fclose||Stream close
|-
|_fcloseall||All open streams close
|-
|fdopen||I/O association with file
|-
|feof||EOF indicator test
|-
|ferror||Read/write error test
|-
|fflush||Buffer write to file
|-
|fgets||Byte read
|-
|fgetpos||File position
|-
|fgets||String read
|-
|fgetwc||Wide character read from stream
|-
|fgetws||Wide char string read from stream
|-
|fileno||File handle determination
|-
|_flushall||Buffers write to files
|-
|fopen||File open
|-
|fprintf||Formatted data write to stream
|-
|fputc||Byte write
|-
|fputs||String write
|-
|fputwc||Wide character write
|-
|fputws||Wide char string write
|-
|fread||Stream read
|-
|rowspan=18|stdlib.h||abort||stop
|-
|abs||Absolute value of integer
|-
|atexit||Record program termination
|-
|atof||Character string to float conversion
|-
|atoi||Character string to integer conversion
|-
|atol||Character string to long integer conversion
|-
|_atold||Character string to long double conversion
|-
|_beginthread||New thread creation
|-
|bsearch||Array search
|-
|calloc||Storage space reservation
|-
|div||Quotient and remainder
|-
|_ecvt||Floating-point to character conversion
|-
|_endthread||Thread termination
|-
|exit||Program exit
|-
|_exit||Process end
|-
|_fcvt||Floating-point to string conversion
|-
|labs||Absolute value of long integer
|-
|ldiv||Long division
|-
|rowspan=9|time.h||asctime||Time to character string conversion
|-
|clock||Processor time
|-
|ctime||Time to character string conversion
|-
|difftime||Time difference
|-
|gmtime||Time structure
|-
|localtime||Time conversion
|-
|mktime||Time conversion
|-
|strftime||Time conversion
|-
|time||Time determination
|}
==Header files==
==Header files==
;C90
;C90
Line 36: Line 305:
*threads.h - thread management
*threads.h - thread management
*uchar.h - Unicode character handling
*uchar.h - Unicode character handling
==Implementations==


==Publications==
==Publications==

Latest revision as of 16:49, 23 February 2020

The C library is a system library that contains common C language subroutines for file access, string operators, character operations, memory allocation, and other functions.

Library Functions

Header Function Extension
assert.h assert Diagnostic message
complex.h Complex arithmetics C99
cacos, casin, catan, ccos, csin, ctan Trigonometric
cacosh, casinh, catanh, ccosh, csinh, ctanh Hyperbolic
cexp, clog Exponential and logarithmic
cabs, cpow, csqrt Power and absolute value
carg, cproj Manipulation
conio.h _cgets Character read
_cprintf Character print
_cputs String write
_cscanf Read from keyboard
ctype.h isalnum
isalpha
isblank
iscntrl
isdigit
isgraph
islower
isprint
ispunct
isspace
isupper
isxdigit
tolower
toupper
direct.h chdir Change directory
_chdrive Change drive
errno.h Errors
fenv.h Floating point environment C99
iconv.h iconv_close Remove conversion description XPG4
iconv_close Create conversion description XPG4
inttypes.h Integer types format conversion C99
io.h access Access mode determination
chmod Change file permission
_chsize Change file length
close Close file handle
creat Create file
dup Duplicate file handle
dup2 Second handle for open file
__eof End of file determination
_filelength File length determination
isatty, _isatty Character device determination X/Open
lseek File pointer movement
open File open
read File read
_tell File pointer position
umask File permission mask setting
write Write from buffer to file
langinfo.h nl_langinfo Retrieve locale info XPG4
locale.h localeconv Locale information from environment
math.h acos Arccosine
asin Arcsine
atan, atan2 Arctangent
_j0, j1, _jn
_y0, _y1, _yn		 Bessel
ceil Find integer greater or equal
cos Cosine
cosh Cosine hyperbolic
erf, erfc Error functions
exp Exponential
fabs Absolute value of floating-point
floor Find integer smaller or equal
fmod Remainder of floating-point
frexp Floating-point value separation
gamma Gamma SAA
hypot Hypotenuse
ldexp Power of 2
log Natural logarithm
log10 Decimal logarithm
_matherr Math library error processing
modf Floating-point value separation
pow Power
sin Sine
sinh Sine hyperbolic
sqrt Square root
tan Tangent
tanh Tangent hyperbolic
monetary.h strfmon Monetary value format XPG4
nl_types.h catclose Message catalogue close
catgets Message catalogue retrieval
catgets Message catalogue open
process.h _cwait Child process wait
execl Child process execution
search.h lfind Find key in array
stdio.h clearerr Error indicator reset
fclose Stream close
_fcloseall All open streams close
fdopen I/O association with file
feof EOF indicator test
ferror Read/write error test
fflush Buffer write to file
fgets Byte read
fgetpos File position
fgets String read
fgetwc Wide character read from stream
fgetws Wide char string read from stream
fileno File handle determination
_flushall Buffers write to files
fopen File open
fprintf Formatted data write to stream
fputc Byte write
fputs String write
fputwc Wide character write
fputws Wide char string write
fread Stream read
stdlib.h abort stop
abs Absolute value of integer
atexit Record program termination
atof Character string to float conversion
atoi Character string to integer conversion
atol Character string to long integer conversion
_atold Character string to long double conversion
_beginthread New thread creation
bsearch Array search
calloc Storage space reservation
div Quotient and remainder
_ecvt Floating-point to character conversion
_endthread Thread termination
exit Program exit
_exit Process end
_fcvt Floating-point to string conversion
labs Absolute value of long integer
ldiv Long division
time.h asctime Time to character string conversion
clock Processor time
ctime Time to character string conversion
difftime Time difference
gmtime Time structure
localtime Time conversion
mktime Time conversion
strftime Time conversion
time Time determination

Header files

C90
  • assert.h - assert macro
  • ctype.h - character types
  • errno.h - error testing
  • float.h - floating point
  • limits.h - macro constants
  • locale.h - localisation
  • math.h - mathematical
  • setjmp.h - declaration of setjmp & longjmp
  • signal.h - signal handling
  • stdarg.h - argument handling
  • stddef.h - types and macros
  • stdio.h - core input/output
  • stdlib.h - numeric conversion, memory allocation, process control
  • string.h - string handling
  • time.h - date and time handling

Normative Addendum 1

  • iso646.h - ISO646 charset
  • wchar.h - wide character
  • wctype.h - wide character types
C99
  • complex.h - complex numbers
  • fenv.h - floating-point environment
  • inttypes.h - exact width integer types
  • stdbool.h - boolean data type
  • stdint.h -
  • tgmath.h - type-generic mathematical
C11
  • stdalign.h - object alignment
  • stdatomic.h - atomic operations
  • stdnoreturn.h - non-returning functions
  • threads.h - thread management
  • uchar.h - Unicode character handling

Publications

  • SAA CPI C Reference - Level 2, SC09-1308
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