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- /* fn.c: arbitrarily long filenames (or just strings).
-
- Copyright (C) 1993 Karl Berry.
-
- 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, 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 <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 P1H(void)
- {
- fn_type ret;
-
- FN_ALLOCATED (ret) = FN_LENGTH (ret) = 0;
- FN_STRING (ret) = NULL;
-
- return ret;
- }
-
-
- fn_type
- fn_copy0 P2C(const_string, s, unsigned, len)
- {
- fn_type ret;
-
- FN_ALLOCATED (ret) = CHUNK_SIZE > len ? CHUNK_SIZE : len + 1;
- FN_STRING (ret) = 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 P1C(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 P2C(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 P2C(fn_type *, f, char, c)
- {
- grow (f, 1);
- FN_STRING (*f)[FN_LENGTH (*f)] = c;
- FN_LENGTH (*f)++;
- }
-
-
- void
- fn_grow P3C(fn_type *, f, address, source, unsigned, len)
- {
- grow (f, len);
- strncpy (FN_STRING (*f) + FN_LENGTH (*f), source, len);
- FN_LENGTH (*f) += len;
- }
-
-
- void
- fn_str_grow P2C(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 P2C(fn_type *, f, unsigned, loc)
- {
- assert (FN_LENGTH (*f) > loc);
- FN_STRING (*f)[loc] = 0;
- FN_LENGTH (*f) = loc + 1;
- }
-