您不应修改argv[i].即使您这样做，也只有一个argv[1]，因此对它执行strcat()将会继续追加到先前的内容中.

You shouldn't modify argv[i]. Even if you do, you only have one argv[1], so doing strcat() on it is going to keep appending to whatever you had in it earlier.

您还有另一个细微的错误.在大多数系统上，目录名和文件名应由路径分隔符/分隔.您无需在代码中添加它.

You have another subtle bug. A directory name and file names in it should be separated by the path separator, / on most systems. You don't add that in your code.

要解决此问题，请在while循环之外:

To fix this, outside of your while loop:

size_t arglen = strlen(argv[1]);

您应该在while循环中执行此操作:

You should do this in your while loop:

/* + 2 because of the '/' and the terminating 0 */
char *fullpath = malloc(arglen + strlen(ep->d_name) + 2);
if (fullpath == NULL) { /* deal with error and exit */ }
sprintf(fullpath, "%s/%s", path, ep->d_name);
/* use fullpath */
free(fullpath);