生成随机字符串

extern char szLog[32];char szLog[32]={0};static unsigned long next = 1;/* RAND_MAX assumed to be 32767 */int myrand(void) {next = next * 1103515245 + 12345;return((unsigned)(next/65536) % 32768);}void mysrand(unsigned seed) {next = seed;}void GenerateDiffNumber(int *diff,int maxn,int num){int rnd=0;int *tmp=NULL;tmp = (int *)malloc(sizeof(int)*maxn);for (int i = 0; i < maxn; i++){tmp[i] = i;}for (int i = 0; i < num; i++){    int seed=(int)(tmp+rnd);do {rnd = rand() % maxn;} while (tmp[rnd]==-1);diff[i] = rnd;tmp[rnd] = -1;  }free(tmp);}void test(){char names[]="zqwertyujiopk123456jhgf4567azxcvbnm";int  n=strlen(names);int  a[128];GenerateDiffNumber(a,n,17);int t=time(NULL)  ;for (int i=0;i<17;i++){int j=a[i];char ch=names[j];szLog[i]=ch;}printf("\nszLog:%s\n",szLog);}