arch/arm/include/asm/string.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_ARM_STRING_H
   3 #define __ASM_ARM_STRING_H
   4
   5 /*
   6  * We don't do inline string functions, since the
   7  * optimised inline asm versions are not small.
   8  */
   9
  10 #define __HAVE_ARCH_STRRCHR
  11 extern char * strrchr(const char * s, int c);
  12
  13 #define __HAVE_ARCH_STRCHR
  14 extern char * strchr(const char * s, int c);
  15
  16 #define __HAVE_ARCH_MEMCPY
  17 extern void * memcpy(void *, const void *, __kernel_size_t);
  18
  19 #define __HAVE_ARCH_MEMMOVE
  20 extern void * memmove(void *, const void *, __kernel_size_t);
  21
  22 #define __HAVE_ARCH_MEMCHR
  23 extern void * memchr(const void *, int, __kernel_size_t);
  24
  25 #define __HAVE_ARCH_MEMSET
  26 extern void * memset(void *, int, __kernel_size_t);
  27
  28 #define __HAVE_ARCH_MEMSET32
  29 extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
  30 static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
  31 {
  32         return __memset32(p, v, n * 4);
  33 }
  34
  35 #define __HAVE_ARCH_MEMSET64
  36 extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
  37 static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
  38 {
  39         return __memset64(p, v, n * 8, v >> 32);
  40 }
  41
  42 extern void __memzero(void *ptr, __kernel_size_t n);
  43
  44 #define memset(p,v,n)                                                   \
  45         ({                                                              \
  46                 void *__p = (p); size_t __n = n;                        \
  47                 if ((__n) != 0) {                                       \
  48                         if (__builtin_constant_p((v)) && (v) == 0)      \
  49                                 __memzero((__p),(__n));                 \
  50                         else                                            \
  51                                 memset((__p),(v),(__n));                \
  52                 }                                                       \
  53                 (__p);                                                  \
  54         })
  55
  56 #endif