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src/common/tuklib_mbstr_width.c
64 строки
1 KB
Lasse Collin
Add SPDX license identifier into 0BSD source code files.
14 фев 2024, 19:31
14 фев 2024, 19:31
22af941
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// SPDX-License-Identifier: 0BSD /////////////////////////////////////////////////////////////////////////////// // /// \file tuklib_mbstr_width.c /// \brief Calculate width of a multibyte string // // Author: Lasse Collin // /////////////////////////////////////////////////////////////////////////////// #include "tuklib_mbstr.h" #include <string.h> #if defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) # include <wchar.h> #endif extern size_t tuklib_mbstr_width(const char *str, size_t *bytes) { const size_t len = strlen(str); if (bytes != NULL) *bytes = len; #if !(defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)) // In single-byte mode, the width of the string is the same // as its length. return len; #else mbstate_t state; memset(&state, 0, sizeof(state)); size_t width = 0; size_t i = 0; // Convert one multibyte character at a time to wchar_t // and get its width using wcwidth(). while (i < len) { wchar_t wc; const size_t ret = mbrtowc(&wc, str + i, len - i, &state); if (ret < 1 || ret > len) return (size_t)-1; i += ret; const int wc_width = wcwidth(wc); if (wc_width < 0) return (size_t)-1; width += (size_t)wc_width; } // Require that the string ends in the initial shift state. // This way the caller can be combine the string with other // strings without needing to worry about the shift states. if (!mbsinit(&state)) return (size_t)-1; return width; #endif }