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Fixed issue #30

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bzt 2022-02-22 10:55:53 +01:00
parent e316fa3f37
commit 38b537710b
1 changed files with 6 additions and 6 deletions
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12
uefi/string.c
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@ -33,7 +33,7 @@
void *memcpy(void *dst, const void *src, size_t n) void *memcpy(void *dst, const void *src, size_t n)
{ {
uint8_t *a=(uint8_t*)dst,*b=(uint8_t*)src; uint8_t *a=(uint8_t*)dst,*b=(uint8_t*)src;
if(src && dst && n>0) { if(src && dst && src != dst && n>0) {
while(n--) *a++ = *b++; while(n--) *a++ = *b++;
} }
return dst; return dst;
@ -42,8 +42,8 @@ void *memcpy(void *dst, const void *src, size_t n)
void *memmove(void *dst, const void *src, size_t n) void *memmove(void *dst, const void *src, size_t n)
{ {
uint8_t *a=(uint8_t*)dst,*b=(uint8_t*)src; uint8_t *a=(uint8_t*)dst,*b=(uint8_t*)src;
if(src && dst && n>0) { if(src && dst && src != dst && n>0) {
if((a<b && a+n>b) || (b<a && b+n>a)) { if(a>b && a<b+n) {
a+=n-1; b+=n-1; while(n-->0) *a--=*b--; a+=n-1; b+=n-1; while(n-->0) *a--=*b--;
} else { } else {
while(n--) *a++ = *b++; while(n--) *a++ = *b++;
@ -64,7 +64,7 @@ void *memset(void *s, int c, size_t n)
int memcmp(const void *s1, const void *s2, size_t n) int memcmp(const void *s1, const void *s2, size_t n)
{ {
uint8_t *a=(uint8_t*)s1,*b=(uint8_t*)s2; uint8_t *a=(uint8_t*)s1,*b=(uint8_t*)s2;
if(s1 && s2 && n>0) { if(s1 && s2 && s1 != s2 && n>0) {
while(n--) { while(n--) {
if(*a != *b) return *a - *b; if(*a != *b) return *a - *b;
a++; b++; a++; b++;
@ -118,7 +118,7 @@ void *memrmem(const void *haystack, size_t hl, const void *needle, size_t nl)
char_t *strcpy(char_t *dst, const char_t *src) char_t *strcpy(char_t *dst, const char_t *src)
{ {
if(src && dst) { if(src && dst && src != dst) {
while(*src) {*dst++=*src++;} *dst=0; while(*src) {*dst++=*src++;} *dst=0;
} }
return dst; return dst;
@ -127,7 +127,7 @@ char_t *strcpy(char_t *dst, const char_t *src)
char_t *strncpy(char_t *dst, const char_t *src, size_t n) char_t *strncpy(char_t *dst, const char_t *src, size_t n)
{ {
const char_t *e = src+n; const char_t *e = src+n;
if(src && dst && n>0) { if(src && dst && src != dst && n>0) {
while(*src && src<e) {*dst++=*src++;} *dst=0; while(*src && src<e) {*dst++=*src++;} *dst=0;
} }
return dst; return dst;