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Diffstat (limited to 'Build/source/texk/kpathsea/fn.c')
-rw-r--r--Build/source/texk/kpathsea/fn.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/Build/source/texk/kpathsea/fn.c b/Build/source/texk/kpathsea/fn.c
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index 00000000000..3464ced7722
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+++ b/Build/source/texk/kpathsea/fn.c
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+/* fn.c: arbitrarily long filenames or strings.
+
+ Copyright 1993, 2008 Karl Berry.
+ Copyright 2001, 2005 Olaf Weber.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this library; if not, see <http://www.gnu.org/licenses/>. */
+
+#include <kpathsea/config.h>
+
+#include <kpathsea/fn.h>
+
+
+/* /usr/local/lib/texmf/fonts/public/cm/pk/ljfour/cmr10.300pk is 58
+ chars, so ASCII `K' seems a good choice. */
+#define CHUNK_SIZE 75
+
+
+fn_type
+fn_init (void)
+{
+ fn_type ret;
+
+ FN_ALLOCATED (ret) = FN_LENGTH (ret) = 0;
+ FN_STRING (ret) = NULL;
+
+ return ret;
+}
+
+
+fn_type
+fn_copy0 (const_string s, unsigned len)
+{
+ fn_type ret;
+
+ FN_ALLOCATED (ret) = CHUNK_SIZE > len ? CHUNK_SIZE : len + 1;
+ FN_STRING (ret) = (string)xmalloc (FN_ALLOCATED (ret));
+
+ strncpy (FN_STRING (ret), s, len);
+ FN_STRING (ret)[len] = 0;
+ FN_LENGTH (ret) = len + 1;
+
+ return ret;
+}
+
+/* Don't think we ever try to free something that might usefully be
+ empty, so give fatal error if nothing allocated. */
+
+void
+fn_free (fn_type *f)
+{
+ assert (FN_STRING (*f) != NULL);
+ free (FN_STRING (*f));
+ FN_STRING (*f) = NULL;
+ FN_ALLOCATED (*f) = 0;
+ FN_LENGTH (*f) = 0;
+}
+
+/* An arithmetic increase seems more reasonable than geometric. We
+ don't increase the length member since it may be more convenient for
+ the caller to add than subtract when appending the stuff that will
+ presumably follow. */
+
+static void
+grow (fn_type *f, unsigned len)
+{
+ while (FN_LENGTH (*f) + len > FN_ALLOCATED (*f))
+ {
+ FN_ALLOCATED (*f) += CHUNK_SIZE;
+ XRETALLOC (FN_STRING (*f), FN_ALLOCATED (*f), char);
+ }
+}
+
+
+void
+fn_1grow (fn_type *f, char c)
+{
+ grow (f, 1);
+ FN_STRING (*f)[FN_LENGTH (*f)] = c;
+ FN_LENGTH (*f)++;
+}
+
+
+void
+fn_grow (fn_type *f, const_string source, unsigned len)
+{
+ grow (f, len);
+ strncpy (FN_STRING (*f) + FN_LENGTH (*f), source, len);
+ FN_LENGTH (*f) += len;
+}
+
+
+void
+fn_str_grow (fn_type *f, const_string s)
+{
+ unsigned more_len = strlen (s);
+ grow (f, more_len);
+ strcat (FN_STRING (*f), s);
+ FN_LENGTH (*f) += more_len;
+}
+
+
+void
+fn_shrink_to (fn_type *f, unsigned loc)
+{
+ assert (FN_LENGTH (*f) > loc);
+ FN_STRING (*f)[loc] = 0;
+ FN_LENGTH (*f) = loc + 1;
+}