diff options
Diffstat (limited to 'file.c')
-rw-r--r-- | file.c | 63 |
1 files changed, 57 insertions, 6 deletions
@@ -4683,9 +4683,11 @@ rb_file_s_basename(int argc, VALUE *argv, VALUE _) return basename; } +static VALUE rb_file_dirname_n(VALUE fname, int n); + /* * call-seq: - * File.dirname(file_name) -> dir_name + * File.dirname(file_name, level = 1) -> dir_name * * Returns all components of the filename given in <i>file_name</i> * except the last one (after first stripping trailing separators). @@ -4694,21 +4696,40 @@ rb_file_s_basename(int argc, VALUE *argv, VALUE _) * not <code>nil</code>. * * File.dirname("/home/gumby/work/ruby.rb") #=> "/home/gumby/work" + * + * If +level+ is given, removes the last +level+ components, not only + * one. + * + * File.dirname("/home/gumby/work/ruby.rb", 2) #=> "/home/gumby" + * File.dirname("/home/gumby/work/ruby.rb", 4) #=> "/" */ static VALUE -rb_file_s_dirname(VALUE klass, VALUE fname) +rb_file_s_dirname(int argc, VALUE *argv, VALUE klass) { - return rb_file_dirname(fname); + int n = 1; + if ((argc = rb_check_arity(argc, 1, 2)) > 1) { + n = NUM2INT(argv[1]); + } + return rb_file_dirname_n(argv[0], n); } VALUE rb_file_dirname(VALUE fname) { + return rb_file_dirname_n(fname, 1); +} + +static VALUE +rb_file_dirname_n(VALUE fname, int n) +{ const char *name, *root, *p, *end; VALUE dirname; rb_encoding *enc; + VALUE sepsv = 0; + const char **seps; + if (n < 0) rb_raise(rb_eArgError, "negative level: %d", n); FilePathStringValue(fname); name = StringValueCStr(fname); end = name + RSTRING_LEN(fname); @@ -4721,10 +4742,40 @@ rb_file_dirname(VALUE fname) if (root > name + 1) name = root - 1; #endif - p = strrdirsep(root, end, enc); - if (!p) { + if (n > (end - root + 1) / 2) { p = root; } + else { + int i; + switch (n) { + case 0: + p = end; + break; + case 1: + if (!(p = strrdirsep(root, end, enc))) p = root; + break; + default: + seps = ALLOCV_N(const char *, sepsv, n); + MEMZERO(seps, const char *, n); + i = 0; + for (p = root; p < end; ) { + if (isdirsep(*p)) { + const char *tmp = p++; + while (p < end && isdirsep(*p)) p++; + if (p >= end) break; + seps[i++] = tmp; + if (i == n) i = 0; + } + else { + Inc(p, end, enc); + } + } + p = seps[i]; + ALLOCV_END(sepsv); + if (!p) p = root; + break; + } + } if (p == name) return rb_usascii_str_new2("."); #ifdef DOSISH_DRIVE_LETTER @@ -6545,7 +6596,7 @@ Init_File(void) rb_define_singleton_method(rb_cFile, "realpath", rb_file_s_realpath, -1); rb_define_singleton_method(rb_cFile, "realdirpath", rb_file_s_realdirpath, -1); rb_define_singleton_method(rb_cFile, "basename", rb_file_s_basename, -1); - rb_define_singleton_method(rb_cFile, "dirname", rb_file_s_dirname, 1); + rb_define_singleton_method(rb_cFile, "dirname", rb_file_s_dirname, -1); rb_define_singleton_method(rb_cFile, "extname", rb_file_s_extname, 1); rb_define_singleton_method(rb_cFile, "path", rb_file_s_path, 1); |