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File: [local] / src / usr.bin / lam / utf8.c (download)
Revision 1.1, Sun Jul 29 11:27:15 2018 UTC (5 years, 10 months ago) by schwarze
UTF-8 support: use wcwidth(3) when calculating column widths; written during g218; no objection when shown on tech@ |
/* $OpenBSD: utf8.c,v 1.1 2018/07/29 11:27:15 schwarze Exp $ */ /* * Copyright (c) 2018 Ingo Schwarze <schwarze@openbsd.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <stdlib.h> #include <wchar.h> /* * Measure the display width of the multibyte string. * Treat invalid bytes and non-printable characters as width 1. * Truncate the string to a display width of maxwidth. * Return the total width, possibly after truncation. */ int mbswidth_truncate(char *mbs, int maxwidth) { wchar_t wc; int len, width, sum; sum = 0; while (*mbs != '\0') { if ((len = mbtowc(&wc, mbs, MB_CUR_MAX)) == -1) len = width = 1; else if ((width = wcwidth(wc)) < 0) width = 1; if (sum + width > maxwidth) { *mbs = '\0'; break; } sum += width; mbs += len; } return sum; }