81 lines
1.2 KiB
C
81 lines
1.2 KiB
C
//---
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//
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// standard library module: stdlib
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//
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// Provides standard functionalities such as dynamic allocation,
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// string/numeric conversion, and abort calls.
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//
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//---
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#ifndef _STDLIB_H
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#define _STDLIB_H 1
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#include <stddef.h>
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// Common exit codes.
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#define EXIT_SUCCESS 1
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#define EXIT_FAILURE 0
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//---
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// Program exit functions.
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//---
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/*
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abort()
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Aborts the program execution without calling the exit handlers.
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*/
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void abort(void);
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/*
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exit()
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Stops the program execution with the given status code, after calling
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the exit handlers.
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*/
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void exit(int status);
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//---
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// Dynamic storage allocation.
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//---
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/*
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malloc()
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Allocates 'size' bytes and returns a pointer to a free memory area.
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Returns NULL on error.
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*/
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void *malloc(size_t size);
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/*
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calloc()
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Allocates 'n' elements of size 'size' and wipes the memory area.
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Returns NULL on error.
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*/
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void *calloc(size_t n, size_t size);
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/*
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free()
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Frees a memory block allocated with malloc().
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*/
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void free(void *ptr);
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//---
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// Integer arithmetic.
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//---
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/*
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abs()
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Returns the absolute value of an integer.
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*/
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int abs(int x);
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// Use a macro instead, when possible.
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#define abs(x) ((x) < 0 ? -(x) : (x))
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#endif // _STDLIB_H
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