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/* $OpenBSD: utf8.c,v 1.1 2016/01/10 14:04:16 schwarze Exp $ */ |
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/* |
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* Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* witH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <ctype.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <vis.h> |
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#include <wchar.h> |
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int |
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mbswprint(const char *mbs, int maxwidth, int trail) |
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{ |
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char buf[5]; |
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wchar_t wc; |
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int len; /* length in bytes of UTF-8 encoded string */ |
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int width; /* display width of a single Unicode char */ |
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int total_width; /* display width of what is printed */ |
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total_width = 0; |
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✓✓✓✓
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while (*mbs != '\0' && total_width < maxwidth) { |
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len = mbtowc(&wc, mbs, MB_CUR_MAX); |
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✗✓ |
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if (len == -1) { |
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(void)mbtowc(NULL, NULL, MB_CUR_MAX); |
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len = 1; |
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} |
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✓✓ |
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if (len == 1) |
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width = vis(buf, mbs[0], |
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VIS_TAB | VIS_NL | VIS_CSTYLE, mbs[1]) - buf; |
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✓✓ |
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else if ((width = wcwidth(wc)) == -1) { |
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/* U+FFFD replacement character */ |
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memcpy(buf, "\357\277\275\0", 4); |
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width = 1; |
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} else { |
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memcpy(buf, mbs, len); |
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buf[len] = '\0'; |
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} |
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✓✗ |
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if (total_width + width > maxwidth) |
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break; |
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fputs(buf, stdout); |
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total_width += width; |
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mbs += len; |
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} |
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✓✓ |
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if (trail) |
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✓✓ |
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while (total_width++ < maxwidth) |
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✓✗ |
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putchar(' '); |
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return total_width; |
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} |