GNUPro C Library
Copyright © 1991 by AT&T.
Original document written by: Steve Chamberlain and Roland Pesch.
The following documentation discusses the header classes and the functions that they contain in the Cygnus C library.
- Standard utility functions (stdlib.h)
- Character type macros and functions (ctype.h)
- Input and output (stdio.h)
- Strings and memory (string.h)
- Signal handling (signal.h)
- Time functions (time.h)
- Locale (Locale.h)
- Reentrancy
- Miscellaneous macros and functions
- System calls
- Definitions for OS interface
- Reentrant covers for OS subroutines
- Variable argument lists
- ANSI-standard macros (stdarg.h)
-
Traditional
macros (varargs.h)
- Standard utility functions (stdlib.h)
- abort [abnormal termination of a program]
- abs [integer absolute value (magnitude)]
- assert [macro for debugging diagnostics]
- atexit [request execution of functions at program exit]
- atof, atoff [string to double or float]
- atoi, atol [string to integer]
- bsearch [binary search]
- calloc [allocate space for arrays]
- div [divide two integers]
- ecvt, ecvtf, fcvt, fcvtf [double or float to string]
- gvcvt, gcvtf [format double or float as string]
- ecvtbuf, fcvtbuf [double or float to string]
- exit [end program execution]
- getenv [look up environment variable]
- labs [long integer absolute value]
- ldiv [divide two long integers]
- malloc, realloc, free [manage memory]
- mallinfo, malloc_stats, mallopt [malloc support]
- __malloc_lock, __malloc_unlock [lock malloc pool]
- mmbtowc [minimal multibyte to wide char converter]
- qsort [sort an array]
- rand, srand [pseudo-random numbers]
- strtod, strtodf [string to double or float]
- strtol [string to long]
- strtoul [string to unsigned long]
- system [execute command string]
- wctomb [minimal wide char to multibyte converter]
- Character type macros and functions (ctype.h)
- isalnum [alphanumeric character predicate]
- isalpha [alphabetic character predicate]
- isascii [ASCII character predicate]
- iscntrl [control character predicate]
- isdigit [decimal digit predicate]
- islower [lower-case character predicate]
- isprint, isgraph [printable character predicates]
- ispunct [punctuation character predicate]
- isspace [whitespace character predicate]
- isupper [uppercase character predicate]
- isxdigit [hexadecimal digit predicate]
- toascii [force integers to ASCII range]
- tolower [translate characters to lower case]
- toupper [translate characters to upper case]
- Input and output (stdio.h)
- clearerr [clear file or stream error indicator]
- fclose [close a file]
- feof [test for end of file]
- ferror [test whether read/write error has occurred]
- fflush [flush buffered file output]
- fgetc [get a character from a file or stream]
- fgetpos [record position in a stream or file]
- fgets [get character string from a file or stream]
- fiprintf [format output to file (integer only)]
- fopen [open a file]
- fdopen [turn open file into a stream]
- fputc [write a character on a stream or file]
- fputs [write a character string in a file or stream]
- fread [read array elements from a file]
- freopen [open a file using an existing file descriptor]
- fseek [set file position]
- fsetpos [restore position of a stream or file]
- ftell [return position in a stream or file]
- fwrite [write array elements]
- getc [read a character (macro)]
- getchar [read a character (macro)]
- gets [get character string]
- iprintf [write formatted output (integer only)]
- mktemp, mkstemp [generate unused file name]
- perror [print an error message on standard error]
- putc [write a character (macro)]
- putchar [write a character (macro)]
- puts [write a character string]
- remove [delete a files name]
- rename [rename a file]
- rewind [reinitialize a file or stream]
- setbuf [specify full buffering for a file or stream]
- setvbuf [specify file or stream buffering]
- siprintf [write formatted output (integer only)]
- printf, fprintf, sprintf [format output]
- scanf, fscanf, sscanf [scan and format input]
- tmpfile [create a temporary file]
- tmpnam, tempnam [name for a temporary file]
- vprintf, vfprintf, vsprintf [format argument list]
- Strings and memory (string.h)
- bcmp [compare two memory areas]
- bcopy [copy memory regions]
- bzero [initialize memory to zero]
- index [search for character in string]
- memchr [find character in memory]
- memcmp [compare two memory areas]
- memcpy [copy memory regions]
- memmove [move possibly overlapping memory]
- memset [set an area of memory]
- rindex [reverse search for character in string]
- strcat [concatenate strings]
- strchr [search for character in string]
- strcmp [character string compare]
- strcoll [locale specific character string compare]
- strcpy [copy string]
- strcspn [count chars not in string]
- strerror [convert error number to string]
- trlen [character string length]
- strncat [concatenate strings]
- strncmp [character string compare]
- strncpy [counted copy string]
- strpbrk [find chars in string]
- strrchr [reverse search for character in string]
- strspn [find initial match]
- strstr [find string segment]
- strtok [get next token from a string]
- strxfrm [transform string]
- Signal handling (signal.h)
- Time functions (time.h)
- asctime [format time as string]
- clock [cumulative processor time]
- ctime [convert time to local and format as string]
- difftime [subtract two times]
- gmtime [convert time to UTC traditional form]
- localtime [convert time to local representation]
- mktime [convert time to arithmetic representation]
- strftime [flexible calendar time formatter]
- time [get current calendar time (as single number)]
- Locale (locale.h)
- setlocale, localeconv [select or query locale]
- Rentrancy
- Miscellaneous macros and functions
- unctrl [translate characters to upper case]
- System calls
- Variable argument lists
- ANSI-standard macros (stdarg.h)
- va_start [initialize variable argument list]
- va_arg [extract a value from argument list]
- va_end [abandon a variable argument list]
- Traditional macros (varargs.h)
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