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vim-patch:8.2.2233: cannot convert a byte index into a character index (#13978)

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Problem:    Cannot convert a byte index into a character index.
Solution:   Add charidx(). (Yegappan Lakshmanan, closes vim/vim#7561)
17793ef23a
This commit is contained in:
kuuote
2021-02-23 10:13:14 +09:00
committed by GitHub
parent 9d5f842807
commit 0450e155d4
5 changed files with 98 additions and 0 deletions
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46
src/nvim/eval/funcs.c
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@@ -940,6 +940,52 @@ static void f_char2nr(typval_T *argvars, typval_T *rettv, FunPtr fptr)
(const char_u *)tv_get_string(&argvars[0]));
}
// "charidx()" function
static void f_charidx(typval_T *argvars, typval_T *rettv, FunPtr fptr)
{
rettv->vval.v_number = -1;
if (argvars[0].v_type != VAR_STRING
|| argvars[1].v_type != VAR_NUMBER
|| (argvars[2].v_type != VAR_UNKNOWN
&& argvars[2].v_type != VAR_NUMBER)) {
EMSG(_(e_invarg));
return;
}
const char *str = tv_get_string_chk(&argvars[0]);
varnumber_T idx = tv_get_number_chk(&argvars[1], NULL);
if (str == NULL || idx < 0) {
return;
}
int countcc = 0;
if (argvars[2].v_type != VAR_UNKNOWN) {
countcc = (int)tv_get_number(&argvars[2]);
}
if (countcc < 0 || countcc > 1) {
EMSG(_(e_invarg));
return;
}
int (*ptr2len)(const char_u *);
if (countcc) {
ptr2len = utf_ptr2len;
} else {
ptr2len = utfc_ptr2len;
}
const char *p;
int len;
for (p = str, len = 0; p <= str + idx; len++) {
if (*p == NUL) {
return;
}
p += ptr2len((const char_u *)p);
}
rettv->vval.v_number = len > 0 ? len - 1 : 0;
}
/*
* "cindent(lnum)" function
*/