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