memset

Function Usage

Set data of a specified length in the destination memory to a specified value.

Function Syntax

void *memset(void *destination, int value, size_t size);

Parameters

Return Value

• Success: A pointer to the destination memory is returned.
• Failure: A null pointer is returned.

Example

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "kqmalloc.h"

#define KQMALLOC_TEST_LEN 10

void MemsetExample()
{
    int8_t *destination = (int8_t *)malloc(KQMALLOC_TEST_LEN * sizeof(int8_t));
    if (destination == NULL) {
        printf("destination is null\n");
        return;
    } else {
        printf("destination address: %lx\n", destination);
        for (int8_t i = 0; i < KQMALLOC_TEST_LEN; ++i) {
            destination[i] = i;
        }
        printf("destination test data before memcpy:");
        for (int8_t i = 0; i < KQMALLOC_TEST_LEN; ++i) {
            printf(" %d", destination[i]);
        }
        printf("\n");
    }
    int8_t *res = memset(destination , 1, KQMALLOC_TEST_LEN * sizeof(int8_t));
    printf("res address: %lx\n", res);
    if (res != NULL) {
        printf("res test data after memcpy:");
        for (int8_t i = 0; i < KQMALLOC_TEST_LEN; ++i) {
            printf(" %d", res[i]);
        }
        printf("\n");
    }

    free(destination);
}

int main(void) {
    MemsetExample();
    return 0;
}

Output:

destination address: ffff9fe17174
destination test data before memcpy: 0 1 2 3 4 5 6 7 8 9
res address: ffff9fe17174
res test data after memcpy: 1 1 1 1 1 1 1 1 1 1