/*--------------------------------------------------------------------------
STDLIB.H
Standard functions.
Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/
#ifndef __STDLIB_H__
#define __STDLIB_H__
#ifndef _SIZE_T
#define _SIZE_T
typedef unsigned int size_t;
#endif
#ifndef NULL
#define NULL ((void *) 0L)
#endif
#ifndef _WCHAR_T_DEFINED_
#define _WCHAR_T_DEFINED_
typedef char wchar_t;
#endif
#pragma SAVE
#pragma REGPARMS
extern int abs (int val);
extern long labs (long val);
extern float atof (char *s1);
extern long atol (char *s1);
extern int atoi (char *s1);
extern int rand ();
extern void srand (int);
extern float strtod (char *, char **);
extern long strtol (char *, char **, unsigned char);
extern unsigned long strtoul (char *, char **, unsigned char);
#define _MALLOC_MEM_ xdata
extern int init_mempool (void _MALLOC_MEM_ *p, unsigned int size);
extern void _MALLOC_MEM_ *malloc (unsigned int size);
extern void free (void _MALLOC_MEM_ *p);
extern void _MALLOC_MEM_ *realloc (void _MALLOC_MEM_ *p, unsigned int size);
extern void _MALLOC_MEM_ *calloc (unsigned int size, unsigned int len);
#pragma RESTORE
#endif
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这就是KEIL中STDLIB.H的头文件。