C/C++编程：Linux下创建多级目录

小灰灰 2022-12-11 07:45 600阅读 0赞

#include <malloc.h>
    #include <memory.h>
    #include <sys/stat.h>
    #include <errno.h>
    
    int acl_make_dirs(const char *path, int perms)
    {
        
        char   *saved_path;
        unsigned char *cp;
        int     saved_ch;
        struct stat st;
        int     ret;
    #if 0
        mode_t  saved_mode = 0;
    #endif
    
    
        cp = (unsigned char *) (saved_path = strdup(path));
    
    
    #define SKIP_WHILE(cond, ptr) {
           while(*ptr && (cond)) ptr++; }
    
        SKIP_WHILE(*cp == '/', cp);  // cp = /home/oceanstar/cutimage/1/2/3  ---> home/oceanstar/cutimage/1/2/3   (cp 指向 第一个不是'/'的字符或者'\0')
    
        for (;;) {
        
            SKIP_WHILE(*cp != '/', cp);  // 比如 cp = home/oceanstar/cutimage/1/2/3 -->  /oceanstar/cutimage/1/2/3 ;  (cp 指向 第一个'/'的字符或者'\0')
            if ((saved_ch = *cp) != 0)   // 还有路径没有判断
                *cp = 0;   // 暂且切断字符串
            if ((ret = stat(saved_path, &st)) >= 0) {
          // 路径已存在    saved_path = [/home, /home/oceanstar, home/oceanstar/cutimage ...]
                if (!S_ISDIR(st.st_mode)) {
           // 是不是目录
                    errno = ENOTDIR;  // not a directory
                    ret = -1;
                    break;
                }
            } else {
            // 不存在路径
                if (errno!= ENOENT)  // 没有这样的文件或目录
                    break;
    
                /*
                 * mkdir(foo) fails with EEXIST if foo is a symlink.
                 */
                if ((ret = mkdir(saved_path, perms)) < 0) {
        
                    if (errno != EEXIST)
                        break;
                    /* Race condition? */
                    if ((ret = stat(saved_path, &st)) < 0)
                        break;
                    if (!S_ISDIR(st.st_mode)) {
        
                        errno = ENOTDIR;
                        ret = -1;
                        break;
                    }
                }
            }
            if (saved_ch != 0)  // 还有路径没有判断
                *cp = saved_ch;  // /oceanstar/cutimg
            SKIP_WHILE(*cp == '/', cp);
            if (*cp == 0)
                break;
        }
    
        /*
         * Cleanup.
         */
        free(saved_path);
        return (ret);
    }
    
    
    
    int main(int argc,char *argv[]){
        
        char path[256] = "/home/oceanstar/cutimage/1/2/3";
        if (acl_make_dirs(path, 0700) == -1)
            printf("mkdir %s failed: %s\r\n", path, strerror(errno));
        else
            printf("mkdir %s ok\r\n", path);
    }

[mkdir][]

[mkdir]: https://blog.csdn.net/u011866460/article/details/40923381/