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Source Code Standard Types div_t jmp_buf ldiv_t ptrdiff_t size_t va_list wchar_t Routines By Category Buffer Manipulation Routines Character Routines Data Conversion Routines Math Routines Memory Allocation Routines Stream I/O Routines String Routines Variable Length Argument Routines Miscellaneous Routines Include Files SFR Definitions assert.h ctype.h float.h inttypes.h limits.h math.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h Reference _chkdouble_ _chkfloat_ _getkey _tolower _toupper abs acos asin assert atan atan2 atof atoi atol calloc ceil cos cosh div exp fabs floor fmod free getchar gets init_mempool isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit labs ldiv log log10 longjmp malloc memccpy memchr memcmp memcpy memmove memset modf offsetof pow printf putchar puts rand realloc scanf setjmp sin sinh sprintf sqrt srand sscanf strcat strchr strcmp strcpy strcspn strlen strncat strncmp strncpy strpbrk strpos strrchr strrpbrk strrpos strspn strtod strtol strtoul tan tanh toascii toint tolower toupper ungetchar va_arg va_end va_start vprintf vsprintf AppendixMemory Allocation Routines
| Routine | Attributes | Description |
|---|---|---|
| calloc | Allocates storage for an array from the memory pool. | |
| free | Frees a memory block that was allocated using calloc, malloc, or realloc. | |
| init_mempool | Initializes the memory location and size of the memory pool. | |
| malloc | Allocates a block from the memory pool. | |
| realloc | Reallocates a block from the memory pool. |
The memory allocation functions provide you with a means to specify, allocate, and free blocks of memory from a memory pool. Standard memory allocation functions are implemented as functions and are prototyped in the stdlib.h include file.
Before using any of these functions to allocate memory, you must first specify the size and location of the memory pool using the init_mempool routine.
The calloc and malloc routines allocate blocks of memory from the pool. The calloc routine allocates an array with a specified number of elements of a given size and initializes the array to 0. The malloc routine allocates a specified number of bytes.
The realloc routine changes the size of an allocated block. The free routine returns a previously allocated memory block to the memory pool.
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