sdk/include/string.h

// Copyright Microsoft and CHERIoT Contributors.
// SPDX-License-Identifier: MIT

#pragma once
#include <cdefs.h>
#include <stddef.h>
#include <stdint.h>

int __cheri_libcall    memcmp(const void *str1,
                              const void *str2,
                              size_t      count) __asm__("memcmp");
void *__cheri_libcall  memcpy(void       *dest,
                              const void *src,
                              size_t      n) __asm__("memcpy");
void *__cheri_libcall  memset(void *, int, size_t) __asm__("memset");
void *__cheri_libcall  memmove(void       *dest,
                               const void *src,
                               size_t      n) __asm__("memmove");
void *__cheri_libcall  memchr(const void *, int, size_t);
void *__cheri_libcall  memrchr(const void *, int, size_t);
size_t __cheri_libcall strlen(const char *str);
int __cheri_libcall    strncmp(const char *s1, const char *s2, size_t n);
char *__cheri_libcall  strncpy(char *dest, const char *src, size_t n);
int __cheri_libcall    strcmp(const char *s1, const char *s2);
char *__cheri_libcall  strnstr(const char *haystack,
                               const char *needle,
                               size_t      haystackLength);
char *__cheri_libcall  strchr(const char *s, int c);
size_t __cheri_libcall strlcpy(char *dest, const char *src, size_t n);

/**
 * Explicit bzero is a memset variant that the compiler is not permitted to
 * remove.  Our implementation simply wraps memset and is safe from removal
 * because it is provided by a different shared library.
 */
void __cheri_libcall explicit_bzero(void *s, size_t n);

__always_inline static inline char *strcpy(char *dst, const char *src)
{
	return dst + strlcpy(dst, src, SIZE_MAX);
}

__always_inline static inline char *strstr(const char *haystack,
                                           const char *needle)
{
	return strnstr(haystack, needle, SIZE_MAX);
}