c - 从路径获取文件夹

Question

假设我有一个字符串路径(就像这个):

/ROOT/DIRNAME/FILE.TXT

如何获取 file.txt 的父文件夹(在本例中为 DIRNAME)？

Answer 1

对于其中至少应包含一个目录的路径:

char str[1024];   // arbitrary length. just for this example
char *p;
strcpy(str, "/ROOT/DIRNAME/FILE.TXT");  // just get the string from somewhere
p = strrchr(str, '/');
if (p && p != str+1)
{
    *p = 0;
    p = strrchr(p-1, '/');
    if (p) 
        print("folder : %s\n", p+1);  // print folder immediately before the last path element (DIRNAME as requested)
    else
        printf("folder : %s\n", str);  // print from beginning
}
else
    printf("not a path with at least one directory in it\n");