commit 83a62b1b5cdd01077c701498e8f6a9f567af56da
Author: aixiao <aixiao@aixiao.me>
Date:   Wed Jun 1 13:37:23 2022 +0800

    随机密码生成

diff --git a/random_password.c b/random_password.c
new file mode 100644
index 0000000..7ecbd4d
--- /dev/null
+++ b/random_password.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/time.h>
+#include <string.h>
+
+#define BUFFER_SIZ 270
+
+
+char pool[] = {
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
+    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
+    'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
+    'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
+    'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+    'Y', 'Z', '!', '@', '#', '$', '%', '^', '&', '*',
+    '[', ']', '\\', '|', ';', '\'', ',', '.', '/', '{', '}', ':', '"', '<', '>', '?'
+
+    
+}; //随机池
+
+int main(int argc, char *argv[])
+{
+    // srand(time(0));      
+    /*
+       使用 time(0) 做种子，在一秒之内种子是不会变的
+       通过使用微妙，来增加随机数的随机性
+     */
+     
+    int PASSWD_LEN  = 16;
+    struct timeval tpstart;
+    char password[BUFFER_SIZ];
+    int i = 0;
+
+    
+    if (argv[1] != NULL)
+    {
+        PASSWD_LEN = atoi(argv[1]);
+    }
+    memset(password, 0, BUFFER_SIZ);
+    gettimeofday(&tpstart, NULL);
+    srand(tpstart.tv_usec);
+
+
+    while (i != PASSWD_LEN) {
+        password[i++] = pool[rand() % sizeof(pool)];
+    }
+
+    printf("%s\n", password);
+
+    return 0;
+}
+