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string.h

/*
 *  include/asm-s390/string.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 */

#ifndef _S390_STRING_H_
#define _S390_STRING_H_

#ifdef __KERNEL__

#ifndef _LINUX_TYPES_H
#include <linux/types.h>
#endif

#define __HAVE_ARCH_MEMCHR    /* inline & arch function */
#define __HAVE_ARCH_MEMCMP    /* arch function */
#define __HAVE_ARCH_MEMCPY    /* gcc builtin & arch function */
#define __HAVE_ARCH_MEMSCAN   /* inline & arch function */
#define __HAVE_ARCH_MEMSET    /* gcc builtin & arch function */
#define __HAVE_ARCH_STRCAT    /* inline & arch function */
#define __HAVE_ARCH_STRCMP    /* arch function */
#define __HAVE_ARCH_STRCPY    /* inline & arch function */
#define __HAVE_ARCH_STRLCAT   /* arch function */
#define __HAVE_ARCH_STRLCPY   /* arch function */
#define __HAVE_ARCH_STRLEN    /* inline & arch function */
#define __HAVE_ARCH_STRNCAT   /* arch function */
#define __HAVE_ARCH_STRNCPY   /* arch function */
#define __HAVE_ARCH_STRNLEN   /* inline & arch function */
#define __HAVE_ARCH_STRRCHR   /* arch function */
#define __HAVE_ARCH_STRSTR    /* arch function */

/* Prototypes for non-inlined arch strings functions. */
extern int memcmp(const void *, const void *, size_t);
extern void *memcpy(void *, const void *, size_t);
extern void *memset(void *, int, size_t);
extern int strcmp(const char *,const char *);
extern size_t strlcat(char *, const char *, size_t);
extern size_t strlcpy(char *, const char *, size_t);
extern char *strncat(char *, const char *, size_t);
extern char *strncpy(char *, const char *, size_t);
extern char *strrchr(const char *, int);
extern char *strstr(const char *, const char *);

#undef __HAVE_ARCH_MEMMOVE
#undef __HAVE_ARCH_STRCHR
#undef __HAVE_ARCH_STRNCHR
#undef __HAVE_ARCH_STRNCMP
#undef __HAVE_ARCH_STRNICMP
#undef __HAVE_ARCH_STRPBRK
#undef __HAVE_ARCH_STRSEP
#undef __HAVE_ARCH_STRSPN

#if !defined(IN_ARCH_STRING_C)

static inline void *memchr(const void * s, int c, size_t n)
{
      register int r0 asm("0") = (char) c;
      const void *ret = s + n;

      asm volatile(
            "0:   srst  %0,%1\n"
            "     jo    0b\n"
            "     jl    1f\n"
            "     la    %0,0\n"
            "1:"
            : "+a" (ret), "+&a" (s) : "d" (r0) : "cc");
      return (void *) ret;
}

static inline void *memscan(void *s, int c, size_t n)
{
      register int r0 asm("0") = (char) c;
      const void *ret = s + n;

      asm volatile(
            "0:   srst  %0,%1\n"
            "     jo    0b\n"
            : "+a" (ret), "+&a" (s) : "d" (r0) : "cc");
      return (void *) ret;
}

static inline char *strcat(char *dst, const char *src)
{
      register int r0 asm("0") = 0;
      unsigned long dummy;
      char *ret = dst;

      asm volatile(
            "0:   srst  %0,%1\n"
            "     jo    0b\n"
            "1:   mvst  %0,%2\n"
            "     jo    1b"
            : "=&a" (dummy), "+a" (dst), "+a" (src)
            : "d" (r0), "0" (0) : "cc", "memory" );
      return ret;
}

static inline char *strcpy(char *dst, const char *src)
{
      register int r0 asm("0") = 0;
      char *ret = dst;

      asm volatile(
            "0:   mvst  %0,%1\n"
            "     jo    0b"
            : "+&a" (dst), "+&a" (src) : "d" (r0)
            : "cc", "memory");
      return ret;
}

static inline size_t strlen(const char *s)
{
      register unsigned long r0 asm("0") = 0;
      const char *tmp = s;

      asm volatile(
            "0:   srst  %0,%1\n"
            "     jo    0b"
            : "+d" (r0), "+a" (tmp) :  : "cc");
      return r0 - (unsigned long) s;
}

static inline size_t strnlen(const char * s, size_t n)
{
      register int r0 asm("0") = 0;
      const char *tmp = s;
      const char *end = s + n;

      asm volatile(
            "0:   srst  %0,%1\n"
            "     jo    0b"
            : "+a" (end), "+a" (tmp) : "d" (r0)  : "cc");
      return end - s;
}

#endif /* !IN_ARCH_STRING_C */

#endif /* __KERNEL__ */

#endif /* __S390_STRING_H_ */

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