What is the memset for? [closed]

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What is the memset for? [closed]

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#1 by (3 votes)

-5

But I really do not know what function the memset performs ().

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main()
{
    int data_processed;
    int file_pipes[2];
    const char some_data[] = "123";
    char buffer [BUFSIZ + 1];
    pid_t fork_result;

    memset(buffer, '#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main()
{
    int data_processed;
    int file_pipes[2];
    const char some_data[] = "123";
    char buffer [BUFSIZ + 1];
    pid_t fork_result;

    memset(buffer, '%pre%', sizeof(buffer));
    if (pipe(file_pipes) == 0){
        fork_result = fork();
        if(fork_result == -1){
            fprintf(stderr, "Fork failure");
            exit(EXIT_FAILURE);
        }
        if (fork_result == 0) {
            data_processed = read(file_pipes[0], buffer, BUFSIZ);
            printf("Read %d bytes: %s \n", data_processed, buffer);
            exit(EXIT_SUCCESS);
        }   
        else {
        data_processed = write(file_pipes[1], some_data, strlen(some_data));
        printf("Wrote %d bytes \n", data_processed);
        }
    }
    exit(EXIT_SUCCESS);
}
', sizeof(buffer));
    if (pipe(file_pipes) == 0){
        fork_result = fork();
        if(fork_result == -1){
            fprintf(stderr, "Fork failure");
            exit(EXIT_FAILURE);
        }
        if (fork_result == 0) {
            data_processed = read(file_pipes[0], buffer, BUFSIZ);
            printf("Read %d bytes: %s \n", data_processed, buffer);
            exit(EXIT_SUCCESS);
        }   
        else {
        data_processed = write(file_pipes[1], some_data, strlen(some_data));
        printf("Wrote %d bytes \n", data_processed);
        }
    }
    exit(EXIT_SUCCESS);
}

c

asked by Luis Angel López Santos 13.06.2017 в 17:25

source

1 answer

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score 3 · Accepted Answer

The memset function of C * memset (void * str, int c, size_t n) copies the c character (an unsigned char) to the first > n characters from str .

Here is an example:

#include <stdio.h>
#include <string.h>

int main ()
{
     char str[50];

     strcpy(str,"This is string.h library function");
     puts(str);

     memset(str,'$',7);
     puts(str);

     return(0);
}

And what is shown on the screen:

This is string.h library function
$$$$$$$ string.h library function

In your case, replace the buffer elements with '%code%'