/* 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 . */ #include #include /* /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; }