136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2021 Damien P. George
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
// These memory functions are needed when the garbage collector is disabled.
|
|
// A full implementation should be provided, or the garbage collector enabled.
|
|
// The functions here are very simple.
|
|
|
|
extern char _heap_start;
|
|
|
|
void *malloc(size_t n) {
|
|
static char *cur_heap = NULL;
|
|
if (cur_heap == NULL) {
|
|
cur_heap = &_heap_start;
|
|
}
|
|
void *ptr = cur_heap;
|
|
cur_heap += (n + 7) & ~7;
|
|
return ptr;
|
|
}
|
|
|
|
void *realloc(void *ptr, size_t size) {
|
|
void *ptr2 = malloc(size);
|
|
if (ptr && size) {
|
|
memcpy(ptr2, ptr, size); // size may be greater than ptr's region, do copy anyway
|
|
}
|
|
return ptr2;
|
|
}
|
|
|
|
void free(void *p) {
|
|
}
|
|
|
|
// These standard string functions are needed by the runtime, and can be
|
|
// provided either by the system or shared/libc/string0.c. The implementations
|
|
// here are very simple.
|
|
|
|
int memcmp(const void *s1, const void *s2, size_t n) {
|
|
const unsigned char *ss1 = s1, *ss2 = s2;
|
|
while (n--) {
|
|
int c = *ss1++ - *ss2++;
|
|
if (c) {
|
|
return c;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void *memcpy(void *dest, const void *src, size_t n) {
|
|
return memmove(dest, src, n);
|
|
}
|
|
|
|
void *memmove(void *dest, const void *src, size_t n) {
|
|
unsigned char *d = dest;
|
|
const unsigned char *s = src;
|
|
if (s < d && d < s + n) {
|
|
// Need to copy backwards.
|
|
d += n - 1;
|
|
s += n - 1;
|
|
while (n--) {
|
|
*d-- = *s--;
|
|
}
|
|
} else {
|
|
// Can copy forwards.
|
|
while (n--) {
|
|
*d++ = *s++;
|
|
}
|
|
}
|
|
return dest;
|
|
}
|
|
|
|
void *memset(void *s, int c, size_t n) {
|
|
unsigned char *ss = s;
|
|
while (n--) {
|
|
*ss++ = c;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
char *strchr(const char *s, int c) {
|
|
while (*s) {
|
|
if (*s == c) {
|
|
return (char *)s;
|
|
}
|
|
++s;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int strncmp(const char *s1, const char *s2, size_t n) {
|
|
while (*s1 && *s2 && n-- > 0) {
|
|
int c = *s1++ - *s2++;
|
|
if (c) {
|
|
return c;
|
|
}
|
|
}
|
|
if (n == 0) {
|
|
return 0;
|
|
}
|
|
return *s1 - *s2;
|
|
}
|
|
|
|
int strcmp(const char *s1, const char *s2) {
|
|
return strncmp(s1, s2, 0x7fffffff);
|
|
}
|
|
|
|
size_t strlen(const char *s) {
|
|
const char *ss = s;
|
|
while (*ss) {
|
|
++ss;
|
|
}
|
|
return ss - s;
|
|
}
|