56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/* Copyright (c) Kuba Szczodrzyński 2022-04-29. */
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#include "lt_common_api.h"
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/**
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* @brief Generate random bytes using rand().
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*
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* @param buf destination pointer
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* @param len how many bytes to generate
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*/
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void lt_rand_bytes(uint8_t *buf, size_t len) {
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int *data = (int *)buf;
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size_t i;
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for (i = 0; len >= sizeof(int); len -= sizeof(int)) {
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data[i++] = rand();
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}
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if (len) {
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int rem = rand();
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unsigned char *pRem = (unsigned char *)&rem;
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memcpy(buf + i * sizeof(int), pRem, len);
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}
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}
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/**
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* @brief Print data pointed to by buf in hexdump-like format (hex+ASCII).
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*
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* @param buf source pointer
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* @param len how many bytes to print
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* @param offset increment printed offset by this value
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* @param width how many bytes on a line
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*/
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void hexdump(const uint8_t *buf, size_t len, uint32_t offset, uint8_t width) {
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uint16_t pos = 0;
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while (pos < len) {
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// print hex offset
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printf("%06x ", offset + pos);
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// calculate current line width
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uint8_t lineWidth = MIN(width, len - pos);
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// print hexadecimal representation
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for (uint8_t i = 0; i < lineWidth; i++) {
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if (i % 8 == 0) {
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printf(" ");
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}
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printf("%02x ", buf[pos + i]);
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}
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// print ascii representation
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printf(" |");
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for (uint8_t i = 0; i < lineWidth; i++) {
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char c = buf[pos + i];
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putchar((c >= 0x20 && c <= 0x7f) ? c : '.');
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}
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puts("|\r");
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pos += lineWidth;
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}
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}
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