arch/sparc/include/asm/string_32.h

   1 /*
   2  * string.h: External definitions for optimized assembly string
   3  *           routines for the Linux Kernel.
   4  *
   5  * Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #ifndef __SPARC_STRING_H__
  10 #define __SPARC_STRING_H__
  11
  12 #include <asm/page.h>
  13
  14 /* Really, userland/ksyms should not see any of this stuff. */
  15
  16 #ifdef __KERNEL__
  17
  18 extern void __memmove(void *,const void *,__kernel_size_t);
  19
  20 #ifndef EXPORT_SYMTAB_STROPS
  21
  22 /* First the mem*() things. */
  23 #define __HAVE_ARCH_MEMMOVE
  24 #undef memmove
  25 #define memmove(_to, _from, _n) \
  26 ({ \
  27         void *_t = (_to); \
  28         __memmove(_t, (_from), (_n)); \
  29         _t; \
  30 })
  31
  32 #define __HAVE_ARCH_MEMCPY
  33 #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
  34
  35 #define __HAVE_ARCH_MEMSET
  36 #define memset(s, c, count) __builtin_memset(s, c, count)
  37
  38 #define __HAVE_ARCH_MEMSCAN
  39
  40 #undef memscan
  41 #define memscan(__arg0, __char, __arg2)                                         \
  42 ({                                                                              \
  43         extern void *__memscan_zero(void *, size_t);                            \
  44         extern void *__memscan_generic(void *, int, size_t);                    \
  45         void *__retval, *__addr = (__arg0);                                     \
  46         size_t __size = (__arg2);                                               \
  47                                                                                 \
  48         if(__builtin_constant_p(__char) && !(__char))                           \
  49                 __retval = __memscan_zero(__addr, __size);                      \
  50         else                                                                    \
  51                 __retval = __memscan_generic(__addr, (__char), __size);         \
  52                                                                                 \
  53         __retval;                                                               \
  54 })
  55
  56 #define __HAVE_ARCH_MEMCMP
  57 extern int memcmp(const void *,const void *,__kernel_size_t);
  58
  59 /* Now the str*() stuff... */
  60 #define __HAVE_ARCH_STRLEN
  61 extern __kernel_size_t strlen(const char *);
  62
  63 #define __HAVE_ARCH_STRNCMP
  64
  65 extern int __strncmp(const char *, const char *, __kernel_size_t);
  66
  67 static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
  68 {
  69         register int retval;
  70         switch(count) {
  71         case 0: return 0;
  72         case 1: return (src[0] - dest[0]);
  73         case 2: retval = (src[0] - dest[0]);
  74                 if(!retval && src[0])
  75                   retval = (src[1] - dest[1]);
  76                 return retval;
  77         case 3: retval = (src[0] - dest[0]);
  78                 if(!retval && src[0]) {
  79                   retval = (src[1] - dest[1]);
  80                   if(!retval && src[1])
  81                     retval = (src[2] - dest[2]);
  82                 }
  83                 return retval;
  84         case 4: retval = (src[0] - dest[0]);
  85                 if(!retval && src[0]) {
  86                   retval = (src[1] - dest[1]);
  87                   if(!retval && src[1]) {
  88                     retval = (src[2] - dest[2]);
  89                     if (!retval && src[2])
  90                       retval = (src[3] - dest[3]);
  91                   }
  92                 }
  93                 return retval;
  94         case 5: retval = (src[0] - dest[0]);
  95                 if(!retval && src[0]) {
  96                   retval = (src[1] - dest[1]);
  97                   if(!retval && src[1]) {
  98                     retval = (src[2] - dest[2]);
  99                     if (!retval && src[2]) {
 100                       retval = (src[3] - dest[3]);
 101                       if (!retval && src[3])
 102                         retval = (src[4] - dest[4]);
 103                     }
 104                   }
 105                 }
 106                 return retval;
 107         default:
 108                 retval = (src[0] - dest[0]);
 109                 if(!retval && src[0]) {
 110                   retval = (src[1] - dest[1]);
 111                   if(!retval && src[1]) {
 112                     retval = (src[2] - dest[2]);
 113                     if(!retval && src[2])
 114                       retval = __strncmp(src+3,dest+3,count-3);
 115                   }
 116                 }
 117                 return retval;
 118         }
 119 }
 120
 121 #undef strncmp
 122 #define strncmp(__arg0, __arg1, __arg2) \
 123 (__builtin_constant_p(__arg2) ? \
 124  __constant_strncmp(__arg0, __arg1, __arg2) : \
 125  __strncmp(__arg0, __arg1, __arg2))
 126
 127 #endif /* !EXPORT_SYMTAB_STROPS */
 128
 129 #endif /* __KERNEL__ */
 130
 131 #endif /* !(__SPARC_STRING_H__) */