2 Standard Utility Functions (stdlib.h)

This chapter groups utility functions useful in a variety of programs. The corresponding declarations are in the header file stdlib.h.

• _Exit: End program execution without cleaning up
• a64l: String to long long
• 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: String to double or float
• atoi: String to integer
• atoll: String to long long
• bsearch: Binary search
• calloc: Allocate space for arrays
• div: Divide two integers
• ecvtbuf: Double or float to string of digits
• ecvt: Double or float to string of digits (malloc result)
• __env_lock: Lock environment list for getenv and setenv
• gcvt: Format double or float as string
• exit: End program execution
• getenv: Look up environment variable
• itoa: Integer to string
• labs: Long integer absolute value (magnitude)
• ldiv: Divide two long integers
• llabs: Long long integer absolute value (magnitude)
• lldiv: Divide two long long integers
• malloc: Allocate and manage memory (malloc, realloc, free)
• mallinfo: Get information about allocated memory
• __malloc_lock: Lock memory pool for malloc and free
• mbsrtowcs: Convert a character string to a wide-character string
• mbstowcs: Minimal multibyte string to wide string converter
• mblen: Minimal multibyte length
• mbtowc: Minimal multibyte to wide character converter
• on_exit: Request execution of functions at program exit
• qsort: Array sort
• rand: Pseudo-random numbers
• random: Pseudo-random numbers
• rand48: Uniformly distributed pseudo-random numbers
• rpmatch: Determine whether response is affirmative or negative
• strtod: String to double or float
• strtol: String to long
• strtoll: String to long long
• strtoul: String to unsigned long
• strtoull: String to unsigned long long
• wcsrtombs: Convert a wide-character string to a character string
• wcstod: Wide string to double or float
• wcstol: Wide string to long
• wcstoll: Wide string to long long
• wcstoul: Wide string to unsigned long
• wcstoull: Wide string to unsigned long long
• system: Execute command string
• utoa: Unsigned integer to string
• wcstombs: Minimal wide string to multibyte string converter
• wctomb: Minimal wide character to multibyte converter