65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
// **** libc ****
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void delay(uint32_t a) {
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volatile uint32_t i;
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for (i = 0; i < a; i++);
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}
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void *memset(void *str, int c, unsigned int n) {
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uint8_t *s = str;
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for (unsigned int i = 0; i < n; i++) {
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*s = c;
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s++;
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}
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return str;
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}
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#define UNALIGNED(X, Y) \
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(((uint32_t)(X) & (sizeof(uint32_t) - 1U)) | ((uint32_t)(Y) & (sizeof(uint32_t) - 1U)))
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void *memcpy(void *dest, const void *src, unsigned int len) {
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unsigned int n = len;
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uint8_t *d8 = dest;
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const uint8_t *s8 = src;
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if ((n >= 4U) && !UNALIGNED(s8, d8)) {
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uint32_t *d32 = (uint32_t *)d8; // cppcheck-suppress misra-c2012-11.3 ; already checked that it's properly aligned
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const uint32_t *s32 = (const uint32_t *)s8; // cppcheck-suppress misra-c2012-11.3 ; already checked that it's properly aligned
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while(n >= 16U) {
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*d32 = *s32; d32++; s32++;
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*d32 = *s32; d32++; s32++;
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*d32 = *s32; d32++; s32++;
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*d32 = *s32; d32++; s32++;
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n -= 16U;
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}
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while(n >= 4U) {
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*d32 = *s32; d32++; s32++;
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n -= 4U;
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}
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d8 = (uint8_t *)d32;
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s8 = (const uint8_t *)s32;
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}
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while (n-- > 0U) {
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*d8 = *s8; d8++; s8++;
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}
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return dest;
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}
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int memcmp(const void * ptr1, const void * ptr2, unsigned int num) {
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int ret = 0;
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const uint8_t *p1 = ptr1;
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const uint8_t *p2 = ptr2;
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for (unsigned int i = 0; i < num; i++) {
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if (*p1 != *p2) {
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ret = -1;
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break;
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}
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p1++;
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p2++;
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}
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return ret;
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}
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