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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
/*
* Simple libc functions. These are not optimized at all and might have some
* bugs as well. Use any optimized routines from newlib or glibc if required.
*/
#include <sbi/sbi_string.h>
/*
Provides sbi_strcmp for the completeness of supporting string functions.
it is not recommended to use sbi_strcmp() but use sbi_strncmp instead.
*/
int sbi_strcmp(const char *a, const char *b)
{
/* search first diff or end of string */
for (; *a == *b && *a != '\0'; a++, b++)
;
return *a - *b;
}
int sbi_strncmp(const char *a, const char *b, size_t count)
{
/* search first diff or end of string */
for (; count > 0 && *a == *b && *a != '\0'; a++, b++, count--)
;
/* No difference till the end */
if (!count)
return 0;
return *a - *b;
}
size_t sbi_strlen(const char *str)
{
unsigned long ret = 0;
while (*str != '\0') {
ret++;
str++;
}
return ret;
}
size_t sbi_strnlen(const char *str, size_t count)
{
unsigned long ret = 0;
while (*str != '\0' && ret < count) {
ret++;
str++;
}
return ret;
}
char *sbi_strcpy(char *dest, const char *src)
{
char *ret = dest;
while ((*dest++ = *src++) != '\0') {
}
return ret;
}
char *sbi_strncpy(char *dest, const char *src, size_t count)
{
char *tmp = dest;
while (count) {
if ((*tmp = *src) != 0)
src++;
tmp++;
count--;
}
return dest;
}
char *sbi_strchr(const char *s, int c)
{
while (*s != '\0' && *s != (char)c)
s++;
if (*s == '\0')
return NULL;
else
return (char *)s;
}
char *sbi_strrchr(const char *s, int c)
{
const char *last = s + sbi_strlen(s);
while (last > s && *last != (char)c)
last--;
if (*last != (char)c)
return NULL;
else
return (char *)last;
}
void *sbi_memset(void *s, int c, size_t count)
{
char *temp = s;
while (count > 0) {
count--;
*temp++ = c;
}
return s;
}
void *sbi_memcpy(void *dest, const void *src, size_t count)
{
char *temp1 = dest;
const char *temp2 = src;
while (count > 0) {
*temp1++ = *temp2++;
count--;
}
return dest;
}
void *sbi_memmove(void *dest, const void *src, size_t count)
{
char *temp1 = (char *)dest;
const char *temp2 = (char *)src;
if (src == dest)
return dest;
if (dest < src) {
while (count > 0) {
*temp1++ = *temp2++;
count--;
}
} else {
temp1 = (char *)dest + count - 1;
temp2 = (char *)src + count - 1;
while (count > 0) {
*temp1-- = *temp2--;
count--;
}
}
return dest;
}
int sbi_memcmp(const void *s1, const void *s2, size_t count)
{
const char *temp1 = s1;
const char *temp2 = s2;
for (; count > 0 && (*temp1 == *temp2); count--) {
temp1++;
temp2++;
}
if (count > 0)
return *(unsigned char *)temp1 - *(unsigned char *)temp2;
else
return 0;
}
void *sbi_memchr(const void *s, int c, size_t count)
{
const unsigned char *temp = s;
while (count > 0) {
if ((unsigned char)c == *temp++) {
return (void *)(temp - 1);
}
count--;
}
return NULL;
}
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