c - 对于用户输入的目录路径，C 中可能存在不同的错误处理吗？

Question

这个问题已经有答案了:

Checking if a directory exists in Unix (system call) (5 个回答)

已关闭 6 年前。

      int main(int argc, char *argv[]) {
    int opt= 0;
    int start = -1, end = -1;
    char *alg,*dir,*graph;
   //Specifying the expected options
   //The two options s and e expect numbers as argument
    static struct option long_options[] = {
    {"start",no_argument,0,'s' },
    {"end",no_argument,0,'e' },
    {"algorithm",no_argument, 0,'a' },
    {"directory",required_argument, 0,'d' },
    {"graph",required_argument,0,'g' },
    {0,0,0,0}
   };

    int long_index =0;
    int i=0,j=0;
    size_t size = 1;
    while ((opt = getopt_long(argc, argv,"s:e:a:d:h:g:",
           long_options, &long_index )) != -1) {
         switch (opt) {
         case 'd' :
                dir = optarg;

                  if (optarg == NULL)
                     printf("d option is must");
                  else if
                     {
                     // How to verify the path provided is Correct/existing
                     }
                   else 
                       {
                        // Any more options of error handling on path 
                         provided is available ? 
                        }

用户通过选项-d传递目录路径，如何验证路径是否正确？

为此还可以包含哪些错误检查？

Answer 1

如果您尝试打开该目录中的文件，请打开它并检查它是否打开

FILE *infile=fopen("<directory>/<filename>","r");
if(infile==NULL){
    printf("File did not open\n");  //implies directory or filename is invalid
}

虽然我不确定这就是你要问的。请详细说明