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/*
* Copyright (C) 2026 Peter Mikkelsen <petermikkelsen10@gmail.com>
*
* This file is part of aplwc.
*
* Aplwc is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Aplwc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with aplwc. If not, see <https://www.gnu.org/licenses/>.
*/
#include "aplwc_internal.h"
struct string *
chars_to_string(struct aplwc *aplwc, const char *chars, int len)
{
const uint8_t *utf8;
size_t bytecount, charcount;
struct string *string;
uint32_t c;
uint8_t b;
int seqlen, extra;
utf8 = (const uint8_t *)chars;
seqlen = extra = 0;
for(bytecount = 0, charcount = 0; ((bytecount < (unsigned int)len) || (len == -1)) && utf8[bytecount]; bytecount++){
b = utf8[bytecount];
if(extra == 0){
c = 0;
if((b & 0x80) == 0){
seqlen = 0;
c |= (b & 0x7F);
}else if((b & 0xE0) == 0xC0){
seqlen = 1;
c |= (b & 0x1F);
}else if((b & 0xF0) == 0xE0){
seqlen = 2;
c |= (b & 0x0F);
}else if((b & 0xF8) == 0xF0){
seqlen = 3;
c |= (b & 0x7);
}else{
invalid:
aplwc->last_error = APLWC_INVALID_UTF8;
return NULL;
}
extra = seqlen;
}else{
extra--;
c <<= 6;
if((b & 0xC0) == 0x80)
c |= (b & 0x3F);
else
goto invalid;
}
if(extra == 0){
charcount++;
switch(seqlen){
case 0:
if(NEVER(c == 0) || NEVER(c > 0x7F))
goto invalid;
break;
case 1:
if((c < 0x80) || NEVER(c > 0x07FF))
goto invalid;
break;
case 2:
if((c < 0x0800) || NEVER(c > 0xFFFF))
goto invalid;
break;
case 3:
if((c < 0x010000) || NEVER(c > 0x10FFFF))
goto invalid;
break;
}
}
}
if(extra != 0)
goto invalid;
string = memory_alloc_string(aplwc, bytecount);
if(string){
string->bytes = bytecount;
string->chars = charcount;
memcpy(string->utf8, utf8, bytecount);
}
return string;
}
uint32_t
string_char(struct string *string, size_t offset)
{
uint32_t c;
size_t len, i;
assert(offset <= string->bytes);
if(offset == string->bytes)
return INVALID_CHAR;
c = 0;
len = char_length(string, offset);
switch(char_length(string, offset)){
case 1:
c |= string->utf8[offset] & 0x7F;
break;
case 2:
c |= string->utf8[offset] & 0x1F;
break;
case 3:
c |= string->utf8[offset] & 0x0F;
break;
case 4:
c |= string->utf8[offset] & 0x07;
break;
}
for(i = 1; i < len; i++){
c <<= 6;
c |= string->utf8[offset+i] & 0x3F;
}
return c;
}
size_t
char_length(struct string *string, size_t offset)
{
uint8_t b;
assert(offset < string->bytes);
b = string->utf8[offset];
assert(!((b & 0xC0) == 0x80));
if((b & 0x80) == 0)
return 1;
else if((b & 0xE0) == 0xC0)
return 2;
else if((b & 0xF0) == 0xE0)
return 3;
else
return 4;
}
int
string_compare(struct string *a, struct string *b)
{
size_t i;
for(i = 0; (i < a->bytes) && (i < b->bytes); i++){
if(a->utf8[i] < b->utf8[i])
return -1;
else if(a->utf8[i] > b->utf8[i])
return 1;
}
if(a->bytes < b->bytes)
return -1;
else if(a->bytes > b->bytes)
return 1;
else
return 0;
}
struct string *
substring(struct aplwc *aplwc, struct string *s, size_t start, size_t length)
{
size_t bytes, i;
struct string *r;
MEMPTRS(aplwc, 1);
MEMPTR(0, s);
bytes = 0;
for(i = 0; i < length; i++)
bytes += char_length(s, start+bytes);
r = memory_alloc_string(aplwc, bytes);
if(r){
r->bytes = bytes;
r->chars = length;
memcpy(r->utf8, s->utf8+start, bytes);
}
MEMPTRS_EXIT(aplwc);
return r;
}
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