/* 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 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) = (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 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, 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 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; }