string.h

嵌入式系统设计与实验教材二源码linux内核移植与编译

#ifndef __ALPHA_STRING_H__
#define __ALPHA_STRING_H__

#ifdef __KERNEL__

/*
 * GCC of any recent vintage doesn't do stupid things with bcopy.
 * EGCS 1.1 knows all about expanding memcpy inline, others don't.
 *
 * Similarly for a memset with data = 0.
 */

#define __HAVE_ARCH_MEMCPY
extern void * memcpy(void *, const void *, size_t);
#define __HAVE_ARCH_MEMMOVE
extern void * memmove(void *, const void *, size_t);

/* For backward compatibility with modules.  Unused otherwise.  */
extern void * __memcpy(void *, const void *, size_t);

#define memcpy __builtin_memcpy

#define __HAVE_ARCH_MEMSET
extern void * __constant_c_memset(void *, unsigned long, size_t);
extern void * __memset(void *, int, size_t);
extern void * memset(void *, int, size_t);

#define memset(s, c, n)							    \
(__builtin_constant_p(c)						    \
 ? (__builtin_constant_p(n) && (c) == 0					    \
    ? __builtin_memset((s),0,(n)) 					    \
    : __constant_c_memset((s),0x0101010101010101UL*(unsigned char)(c),(n))) \
 : __memset((s),(c),(n)))

#define __HAVE_ARCH_STRCPY
extern char * strcpy(char *,const char *);
#define __HAVE_ARCH_STRNCPY
extern char * strncpy(char *, const char *, size_t);
#define __HAVE_ARCH_STRCAT
extern char * strcat(char *, const char *);
#define __HAVE_ARCH_STRNCAT
extern char * strncat(char *, const char *, size_t);
#define __HAVE_ARCH_STRCHR
extern char * strchr(const char *,int);
#define __HAVE_ARCH_STRRCHR
extern char * strrchr(const char *,int);
#define __HAVE_ARCH_STRLEN
extern size_t strlen(const char *);
#define __HAVE_ARCH_MEMCHR
extern void * memchr(const void *, int, size_t);

/* The following routine is like memset except that it writes 16-bit
   aligned values.  The DEST and COUNT parameters must be even for 
   correct operation.  */

#define __HAVE_ARCH_MEMSETW
extern void * __memsetw(void *dest, unsigned short, size_t count);

#define memsetw(s, c, n)						 \
(__builtin_constant_p(c)						 \
 ? __constant_c_memset((s),0x0001000100010001UL*(unsigned short)(c),(n)) \
 : __memsetw((s),(c),(n)))

extern int strcasecmp(const char *, const char *);

#endif /* __KERNEL__ */

#endif /* __ALPHA_STRING_H__ */