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Make libc functions more standard compliant

This commit is contained in:
mintsuki 2020-04-24 14:48:14 +02:00
parent ee38f8b4c9
commit 5e9adf3542
2 changed files with 44 additions and 53 deletions
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92
src/lib/libc.c
View File

@ -2,41 +2,38 @@
#include <stdint.h>
#include <lib/libc.h>
void *memcpy(void *dest, const void *src, size_t count) {
size_t i = 0;
void *memcpy(void *dest, const void *src, size_t n) {
uint8_t *pdest = dest;
const uint8_t *psrc = src;
uint8_t *dest2 = dest;
const uint8_t *src2 = src;
for (i = 0; i < count; i++) {
dest2[i] = src2[i];
for (size_t i = 0; i < n; i++) {
pdest[i] = psrc[i];
}
return dest;
}
void *memset(void *s, int c, size_t count) {
uint8_t *p = s, *end = p + count;
for (; p != end; p++) {
*p = (uint8_t)c;
void *memset(void *s, int c, size_t n) {
uint8_t *p = s;
for (size_t i = 0; i < n; i++) {
p[i] = (uint8_t)c;
}
return s;
}
void *memmove(void *dest, const void *src, size_t count) {
size_t i = 0;
uint8_t *dest2 = dest;
const uint8_t *src2 = src;
void *memmove(void *dest, const void *src, size_t n) {
uint8_t *pdest = dest;
const uint8_t *psrc = src;
if (src > dest) {
for (i = 0; i < count; i++) {
dest2[i] = src2[i];
for (size_t i = 0; i < n; i++) {
pdest[i] = psrc[i];
}
} else if (src < dest) {
for (i = count; i > 0; i--) {
dest2[i - 1] = src2[i - 1];
for (size_t i = n; i > 0; i--) {
pdest[i-1] = psrc[i-1];
}
}
@ -44,29 +41,19 @@ void *memmove(void *dest, const void *src, size_t count) {
}
int memcmp(const void *s1, const void *s2, size_t n) {
const uint8_t *a = s1;
const uint8_t *b = s2;
const uint8_t *p1 = s1;
const uint8_t *p2 = s2;
for (size_t i = 0; i < n; i++) {
if (a[i] < b[i]) {
return -1;
} else if (a[i] > b[i]) {
return 1;
}
if (p1[i] != p2[i])
return p1[i] < p2[i] ? -1 : 1;
}
return 0;
}
char *strchrnul(const char *s, int c) {
while (*s)
if ((*s++) == c)
break;
return (char *)s;
}
char *strcpy(char *dest, const char *src) {
size_t i = 0;
size_t i;
for (i = 0; src[i]; i++)
dest[i] = src[i];
@ -76,30 +63,35 @@ char *strcpy(char *dest, const char *src) {
return dest;
}
char *strncpy(char *dest, const char *src, size_t cnt) {
size_t i = 0;
char *strncpy(char *dest, const char *src, size_t n) {
size_t i;
for (i = 0; i < cnt; i++)
for (i = 0; i < n && src[i]; i++)
dest[i] = src[i];
for ( ; i < n; i++)
dest[i] = 0;
return dest;
}
int strcmp(const char *dst, const char *src) {
size_t i;
for (i = 0; dst[i] == src[i]; i++) {
if ((!dst[i]) && (!src[i])) return 0;
int strcmp(const char *s1, const char *s2) {
for (size_t i = 0; ; i++) {
char c1 = s1[i], c2 = s2[i];
if (c1 != c2)
return c1 - c2;
if (!c1)
return 0;
}
return 1;
}
int strncmp(const char *dst, const char *src, size_t count) {
size_t i;
for (i = 0; i < count; i++)
if (dst[i] != src[i]) return 1;
int strncmp(const char *s1, const char *s2, size_t n) {
for (size_t i = 0; i < n; i++) {
char c1 = s1[i], c2 = s2[i];
if (c1 != c2)
return c1 - c2;
if (!c1)
return 0;
}
return 0;
}

5
src/lib/libc.h
View File

@ -1,5 +1,5 @@
#ifndef __LIBC_H__
#define __LIBC_H__
#ifndef __LIB__LIBC_H__
#define __LIB__LIBC_H__
#include <stddef.h>
@ -7,7 +7,6 @@ void *memset(void *, int, size_t);
void *memcpy(void *, const void *, size_t);
int memcmp(const void *, const void *, size_t);
void *memmove(void *, const void *, size_t);
char *strchrnul(const char *, int);
char *strcpy(char *, const char *);
char *strncpy(char *, const char *, size_t);
size_t strlen(const char *);