github.com/afumu/libc@v0.0.6/musl/src/misc/dirname.c (about)

     1  #include <string.h>
     2  #include <libgen.h>
     3  
     4  char *dirname(char *s)
     5  {
     6  	size_t i;
     7  	if (!s || !*s) return ".";
     8  	i = strlen(s)-1;
     9  	for (; s[i]=='/'; i--) if (!i) return "/";
    10  	for (; s[i]!='/'; i--) if (!i) return ".";
    11  	for (; s[i]=='/'; i--) if (!i) return "/";
    12  	s[i+1] = 0;
    13  	return s;
    14  }