From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/multibyte/mbrtowc.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 src/multibyte/mbrtowc.c (limited to 'src/multibyte/mbrtowc.c') diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c new file mode 100644 index 0000000..7824997 --- /dev/null +++ b/src/multibyte/mbrtowc.c @@ -0,0 +1,51 @@ +#include +#include +#include +#include "internal.h" + +size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate_t *restrict st) +{ + static unsigned internal_state; + unsigned c; + const unsigned char *s = (const void *)src; + const size_t N = n; + wchar_t dummy; + + if (!st) st = (void *)&internal_state; + c = *(unsigned *)st; + + if (!s) { + if (c) goto ilseq; + return 0; + } else if (!wc) wc = &dummy; + + if (!n) return -2; + if (!c) { + if (*s < 0x80) return !!(*wc = *s); + if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1; + if (*s-SA > SB-SA) goto ilseq; + c = bittab[*s++-SA]; n--; + } + + if (n) { + if (OOB(c,*s)) goto ilseq; +loop: + c = c<<6 | *s++-0x80; n--; + if (!(c&(1U<<31))) { + *(unsigned *)st = 0; + *wc = c; + return N-n; + } + if (n) { + if (*s-0x80u >= 0x40) goto ilseq; + goto loop; + } + } + + *(unsigned *)st = c; + return -2; +ilseq: + *(unsigned *)st = 0; + errno = EILSEQ; + return -1; +} -- cgit v1.2.3