lstrip!()
public
Removes leading whitespace from str, returning nil if no change
was made. See also String#rstrip! and
String#strip!.
Refer to strip for the definition of
whitespace.
" hello ".lstrip!
"hello ".lstrip!
"hello".lstrip!
static VALUE
rb_str_lstrip_bang(VALUE str)
{
rb_encoding *enc;
char *start, *s;
long olen, loffset;
str_modify_keep_cr(str);
enc = STR_ENC_GET(str);
RSTRING_GETMEM(str, start, olen);
loffset = lstrip_offset(str, start, start+olen, enc);
if (loffset > 0) {
long len = olen-loffset;
s = start + loffset;
memmove(start, s, len);
STR_SET_LEN(str, len);
#if !SHARABLE_MIDDLE_SUBSTRING
TERM_FILL(start+len, rb_enc_mbminlen(enc));
#endif
return str;
}
return Qnil;
}