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6932023f4d
syntax-check seems to dislike strncpy. The GNU Coreutils replaced their uses of strncpy with stpncpy. strlcpy is not an option. http://sources.redhat.com/ml/libc-alpha/2002-01/msg00159.html http://sources.redhat.com/ml/libc-alpha/2002-01/msg00011.html http://lists.gnu.org/archive/html/bug-gnulib/2004-09/msg00181.html * src/glyphs.c: Use stpncpy.
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* Graphical symbols.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "glyphs.h"
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#include <assert.h>
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#include <attribute.h>
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#include <stdbool.h>
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#include <string.h>
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#include <mbswidth.h>
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#include <unicodeio.h>
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// In gnulib/lib/unicodeio.h unicode_to_mb uses a buffer of 25 bytes.
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typedef char glyph_buffer_t[26];
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static glyph_buffer_t arrow_buf;
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const char *arrow;
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int arrow_width;
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static glyph_buffer_t down_arrow_buf;
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const char *down_arrow;
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int down_arrow_width;
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static glyph_buffer_t dot_buf;
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const char *dot;
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int dot_width;
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static glyph_buffer_t empty_buf;
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const char *empty;
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int empty_width;
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const char *derivation_separator = " ";
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int derivation_separator_width = 1;
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typedef struct
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{
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const char **glyph;
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char *buf;
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const char *fallback;
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} callback_arg_t;
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static long
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on_success (const char *buf, size_t buflen, void *callback_arg)
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{
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callback_arg_t *arg = (callback_arg_t *) callback_arg;
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assert (buflen + 1 < sizeof arg->buf);
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*stpncpy (arg->buf, buf, buflen) = '\0';
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return 1;
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}
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static long
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on_failure (unsigned code MAYBE_UNUSED, const char *msg MAYBE_UNUSED,
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void *callback_arg)
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{
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callback_arg_t *arg = (callback_arg_t *) callback_arg;
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assert (strlen (arg->fallback) + 1 < sizeof arg->buf);
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strcpy (arg->buf, arg->fallback);
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return 0;
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}
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static bool
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glyph_set (const char **glyph,
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char buf[26], int *width,
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unsigned code, const char *fallback)
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{
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callback_arg_t arg = { glyph, buf, fallback };
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int res = unicode_to_mb (code, on_success, on_failure, &arg);
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*glyph = buf;
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*width = mbswidth (*glyph, 0);
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return res;
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}
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void
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glyphs_init (void)
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{
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glyph_set (&arrow, arrow_buf, &arrow_width, 0x2192, "->");
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glyph_set (&dot, dot_buf, &dot_width, 0x2022, ".");
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glyph_set (&down_arrow, down_arrow_buf, &down_arrow_width, 0x21b3, "`->");
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glyph_set (&empty, empty_buf, &empty_width, 0x03b5, "%empty");
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strncat (down_arrow_buf, " ", sizeof down_arrow_buf - strlen (down_arrow_buf) - 1);
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down_arrow_width += 1;
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}
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