APUE学习笔记 文件和目录 显示文件类型

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
static int ftype(const char *path)
{
        struct stat statres;
        if(lstat(path, &statres) < 0)
        {
                return -1;
        }
        switch(statres.st_mode & S_IFMT)
        {
                case S_IFSOCK:
                        return 's';
                        break;
                case S_IFLNK:
                        return 'l';
                        break;
                case S_IFREG:
                        return '-';
                        break;
                case S_IFBLK:
                        return 'b';
                        break;
                case S_IFDIR:
                        return 'd';
                        break;
                case S_IFCHR:
                        return 'c';
                        break;
                case S_IFIFO:
                        return 'p';
                        break;
                default:
                        return '?';
                        break;
        }
        return '?';
}
int main(int argc, char **argv)
{
        if(argc < 2)
        {
                fprintf(stderr, "Usage...\n");
                exit(1);
        }
        printf("%c\n", ftype(argv[1]));
        exit(0);
}
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