c_point

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

char *av_strdup(const char *s) {
    char *ptr = NULL;
    if (s) {
        size_t len = strlen(s) + 1;
        ptr = calloc(1, len);
        if (ptr)
            memcpy(ptr, s, len);
    }
    return ptr;
}

void my_pthread_create(void *argv) {
    int i;
    char **my_argv = (char **) argv;
    for (i = 0; i < 10000; i++) {
        if (my_argv[i]) {
            printf("str is %s \n", my_argv[i]);
        } else {
            break;
        }
    }
}

int main() {

    int n = 3;

    char **my_argv_p = (char **) malloc(5 * sizeof(char *));

    my_argv_p[0] = av_strdup("mix_cpp_demo.exe");
    my_argv_p[1] = av_strdup("-re");
    my_argv_p[2] = av_strdup("-thread_queue_size");
    my_argv_p[3] = av_strdup("0");
    /* 省略其他参数的赋值 */
    my_argv_p[4] = NULL;

    my_pthread_create(my_argv_p);

    /* 原理分析 */
    char *my_argv2 = malloc(5 * sizeof(char *));
    char **my_argv_p2 = (char**)my_argv2;

    printf("my_argv2     is %p \n", my_argv2);
    printf("my_argv2 + 1 is %p \n", my_argv2 + 1);
    printf("my_argv2[1]  is %p \n", my_argv2 + 1);

    printf("my_argv_p2     is %p \n", my_argv_p2);
    printf("my_argv_p2 + 1 is %p \n", my_argv_p2 + 1);
    printf("my_argv_p2[1]  is %p \n", my_argv_p2[1]);


    return 0;
}