From 229a6ddc64392a5d07f50c3417bb3bf8acc6faa7 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sun, 25 Jan 2026 16:09:16 +0100 Subject: Add transposed MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libcharconv_transposed.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 libcharconv_transposed.c (limited to 'libcharconv_transposed.c') diff --git a/libcharconv_transposed.c b/libcharconv_transposed.c new file mode 100644 index 0000000..af2a835 --- /dev/null +++ b/libcharconv_transposed.c @@ -0,0 +1,48 @@ +/* See LICENSE file for copyright and license details. */ +#include "lib-common.h" + + +enum libcharconv_result +libcharconv_transposed(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp) +{ + uint_least32_t c; + size_t clen; + *n = 0; + while (slen) { + clen = libcharconv_decode_utf8_(s, slen, &c); + if (clen > slen) { + if (*n) + goto no_conv; + return LIBCHARCONV_INDETERMINATE; + } + if (!clen) { + *n += 1u; + slen -= 1u; + s = &s[1]; + continue; + } + + if (UINT32_C(0x1F030) <= c && c <= UINT32_C(0x1F061)) { + c += 0x32u; + goto conv; + } else if (UINT32_C(0x1F062) <= c && c <= UINT32_C(0x1F093)) { + c -= 0x32u; + goto conv; + } + + *n += clen; + s = &s[clen]; + slen -= clen; + } +no_conv: + return LIBCHARCONV_NO_CONVERT; + +conv: + if (*n) + goto no_conv; + if (*ncp) + *cp = c; + *n += clen; + *ncp = 1u; + return LIBCHARCONV_CONVERTED; +} -- cgit v1.2.3-70-g09d2