static VALUE
rb_str_delete_bang(int argc, VALUE *argv, VALUE str)
{
char squeez[TR_TABLE_SIZE];
rb_encoding *enc = 0;
char *s, *send, *t;
VALUE del = 0, nodel = 0;
int modify = 0;
int i, ascompat, cr;
if (RSTRING_LEN(str) == 0 || !RSTRING_PTR(str)) return Qnil;
if (argc < 1) {
rb_raise(rb_eArgError, "wrong number of arguments (at least 1)");
}
for (i=0; i<argc; i++) {
VALUE s = argv[i];
StringValue(s);
enc = rb_enc_check(str, s);
tr_setup_table(s, squeez, i==0, &del, &nodel, enc);
}
str_modify_keep_cr(str);
ascompat = rb_enc_asciicompat(enc);
s = t = RSTRING_PTR(str);
send = RSTRING_END(str);
cr = ascompat ? ENC_CODERANGE_7BIT : ENC_CODERANGE_VALID;
while (s < send) {
unsigned int c;
int clen;
if (ascompat && (c = *(unsigned char*)s) < 0x80) {
if (squeez[c]) {
modify = 1;
}
else {
if (t != s) *t = c;
t++;
}
s++;
}
else {
c = rb_enc_codepoint_len(s, send, &clen, enc);
if (tr_find(c, squeez, del, nodel)) {
modify = 1;
}
else {
if (t != s) rb_enc_mbcput(c, t, enc);
t += clen;
if (cr == ENC_CODERANGE_7BIT) cr = ENC_CODERANGE_VALID;
}
s += clen;
}
}
*t = '\0';
STR_SET_LEN(str, t - RSTRING_PTR(str));
ENC_CODERANGE_SET(str, cr);
if (modify) return str;
return Qnil;
}