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/* See LICENSE file for copyright and license details. */
#include "lib-common.h"
static struct {
uint_least32_t a;
uint_least32_t b;
uint_least32_t to;
} pairs[] = {
{0x00BF, 0x00A1, 0x2E18},
{0x0021, 0x003F, 0x203D}
};
enum libcharconv_result
libcharconv_overlaid(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
uint_least32_t a, b;
size_t i, alen, blen;
*n = 0;
while (slen) {
alen = libcharconv_decode_utf8_(s, slen, &a);
if (alen > slen) {
if (*n)
goto no_conv;
return LIBCHARCONV_INDETERMINATE;
}
if (!alen) {
*n += 1u;
slen -= 1u;
s = &s[1];
continue;
}
for (i = 0u; i < sizeof(pairs) / sizeof(*pairs); i++) {
if (a != pairs[i].a && a != pairs[i].b)
continue;
if (*n)
goto no_conv;
if (slen == alen)
return LIBCHARCONV_INDETERMINATE;
blen = libcharconv_decode_utf8_(&s[alen], slen - alen, &b);
if (blen > slen)
return LIBCHARCONV_INDETERMINATE;
if (!blen)
goto no_conv;
if ((a ^ b) == (pairs[i].a ^ pairs[i].b))
goto conv;
}
*n += alen;
s = &s[alen];
slen -= alen;
}
no_conv:
return LIBCHARCONV_NO_CONVERT;
conv:
if (*n)
goto no_conv;
if (*ncp)
*cp = pairs[i].to;
*n += alen + blen;
*ncp = 1u;
return LIBCHARCONV_CONVERTED;
}
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