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-rw-r--r--dviware/catdvi/linebuf.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/dviware/catdvi/linebuf.c b/dviware/catdvi/linebuf.c
new file mode 100644
index 0000000000..e4720ccffa
--- /dev/null
+++ b/dviware/catdvi/linebuf.c
@@ -0,0 +1,137 @@
+/* catdvi - get text from DVI files
+ Copyright (C) 2000 Bjoern Brill <brill@fs.math.uni-frankfurt.de>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+#include "linebuf.h"
+#include "util.h"
+
+void linebuf_init(linebuf_t * this, size_t initial_size_alloc)
+{
+ if (initial_size_alloc == 0) initial_size_alloc = 81;
+ this->size_alloc = initial_size_alloc;
+
+ this->gstring = malloc(initial_size_alloc * sizeof(glyph_t));
+ if(!this->gstring) enomem();
+
+ linebuf_clear(this);
+}
+
+void linebuf_garray_init(linebuf_t * this, const glyph_t garray[], size_t len)
+{
+ this->size_curr = len;
+ this->size_alloc = len + 1;
+
+ this->gstring = malloc(this->size_alloc * sizeof(glyph_t));
+ if(!this->gstring) enomem();
+
+ memcpy(this->gstring, garray, sizeof(glyph_t) * this->size_alloc);
+ this->gstring[this->size_curr] = 0;
+}
+
+void linebuf_garray0_init(linebuf_t * this, const glyph_t garray0[])
+{
+ int len = 0;
+ while(garray0[len] != 0) ++len;
+ linebuf_garray_init(this, garray0, len);
+}
+
+void linebuf_done(linebuf_t * this)
+{
+ assert(this->gstring);
+
+ free(this->gstring);
+ this->gstring = NULL;
+}
+
+
+void linebuf_clear(linebuf_t * this)
+{
+ assert(this->gstring);
+
+ this->size_curr = 0;
+ this->gstring[0] = 0;
+}
+
+static void linebuf_need_size(linebuf_t * this, size_t size)
+{
+ assert(this->gstring);
+
+ if (size < this->size_alloc) return;
+
+ while(size >= this->size_alloc) this->size_alloc *= 2;
+ this->gstring = realloc(
+ this->gstring,
+ this->size_alloc * sizeof(glyph_t)
+ );
+ if (!this->gstring) enomem();
+}
+
+void linebuf_putg(linebuf_t * this, glyph_t g)
+{
+ assert(this->gstring);
+
+ this->gstring[this->size_curr++] = g;
+ if(this->size_curr >= this->size_alloc) {
+ /* This check is not required before calling linebuf_need_size(),
+ * but saves a function call in most cases.
+ */
+ linebuf_need_size(this, this->size_curr);
+ }
+ this->gstring[this->size_curr] = 0;
+}
+
+
+glyph_t linebuf_peekg(linebuf_t * this)
+{
+ assert(this->gstring);
+
+ if(this->size_curr == 0) return(0);
+ return(this->gstring[this->size_curr - 1]);
+}
+
+
+glyph_t linebuf_unputg(linebuf_t * this)
+{
+ glyph_t last;
+
+ assert(this->gstring);
+
+ if(this->size_curr == 0) return(0);
+
+ last = this->gstring[--(this->size_curr)];
+ this->gstring[this->size_curr] = 0;
+ return(last);
+}
+
+void linebuf_append(linebuf_t * this, const linebuf_t * appendix)
+{
+ assert(this->gstring);
+
+ linebuf_need_size(this, this->size_curr + appendix->size_curr);
+ memcpy(
+ this->gstring + this->size_curr,
+ appendix->gstring,
+ sizeof(glyph_t) * appendix->size_curr
+ );
+ this->size_curr += appendix->size_curr;
+ this->gstring[this->size_curr] = 0;
+}
+