mirror of
https://github.com/memtest86plus/memtest86plus.git
synced 2024-11-23 08:26:23 -06:00
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#ifndef STRING_H
|
|
#define STRING_H
|
|
/**
|
|
* \file
|
|
*
|
|
* Provides a subset of the functions normally provided by <string.h>.
|
|
*
|
|
*//*
|
|
* Copyright (C) 2020-2022 Martin Whitaker.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
|
|
/**
|
|
* Compares the first n bytes of the memory areas pointed to by s1 and s2
|
|
* and returns 0 if all bytes are the same or the numerical difference
|
|
* between the first mismatching byte in s1 (interpreted as an unsigned
|
|
* value) and the corresponding byte in s2.
|
|
*/
|
|
static inline int memcmp(const void *s1, const void *s2, size_t n)
|
|
{
|
|
const unsigned char *src1 = s1, *src2 = s2;
|
|
|
|
for (size_t i = 0; i < n; i++) {
|
|
if (src1[i] != src2[i]) {
|
|
return (int)src1[i] - (int)src2[i];
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Copies n bytes from the memory area pointed to by src to the memory area
|
|
* pointed to by dest and returns a pointer to dest. The memory areas must
|
|
* not overlap.
|
|
* void *memcpy(void *dst, const void *src, size_t n);
|
|
*/
|
|
#define memcpy(d, s, n) __builtin_memcpy((d), (s), (n))
|
|
|
|
/**
|
|
* Copies n bytes from the memory area pointed to by src to the memory area
|
|
* pointed to by dest and returns a pointer to dest. The memory areas may
|
|
* overlap.
|
|
*/
|
|
void *memmove(void *dest, const void *src, size_t n);
|
|
|
|
/**
|
|
* Fills the first n bytes of the memory area pointed to by s with the byte
|
|
* value c.
|
|
* void *memset(void *s, int c, size_t n);
|
|
*/
|
|
#define memset(s, c, n) __builtin_memset((s), (c), (n))
|
|
|
|
/**
|
|
* Returns the string length, excluding the terminating null character.
|
|
*/
|
|
static inline size_t strlen(const char *s)
|
|
{
|
|
size_t len = 0;
|
|
while (*s++) {
|
|
len++;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* Compares at most the first n characters in the strings s1 and s2 and
|
|
* returns 0 if all characters are the same or the numerical difference
|
|
* between the first mismatching character in s1 (interpreted as a signed
|
|
* value) and the corresponding character in s2.
|
|
*/
|
|
static inline int strncmp(const char *s1, const char *s2, size_t n)
|
|
{
|
|
for (size_t i = 0; i < n; i++) {
|
|
if (s1[i] != s2[i]) {
|
|
return (int)s1[i] - (int)s2[i];
|
|
}
|
|
if (s1[i] == '\0') {
|
|
return 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Finds the first occurrence of the substring needle in the string haystack
|
|
* and returns a pointer to the beginning of the located substring, or NULL
|
|
* if the substring is not found.
|
|
*/
|
|
char *strstr(const char *haystack, const char *needle);
|
|
|
|
/**
|
|
* Convert n to characters in s
|
|
*/
|
|
|
|
char *itoa(int num, char *str);
|
|
|
|
/**
|
|
* Convert a hex string to the corresponding 32-bit uint value.
|
|
* returns 0 if a non-hex char is found (not 0-9/a-f/A-F).
|
|
*/
|
|
|
|
uint32_t hexstr2int(const char *hexstr);
|
|
|
|
#endif // STRING_H
|