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/* fn.h: arbitrarily long filenames (or just strings).
Copyright 2001, 2005 Olaf Weber.
Copyright 1993, 2008 Karl Berry.
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/>. */
#ifndef KPATHSEA_FN_H
#define KPATHSEA_FN_H
#include <kpathsea/c-proto.h>
#include <kpathsea/types.h>
/* Arbitrarily long filenames; it's inconvenient to use obstacks here,
because we want to maintain a null terminator. Also used for
dynamically growing strings even when the null byte isn't necessary,
e.g., in `variable.c', since I don't want to pass obstacks around
everywhere, and one can't free parts of an obstack arbitrarily. */
typedef struct
{
string str;
unsigned allocated;
unsigned length; /* includes the terminating null byte, if any */
} fn_type;
#define FN_STRING(fn) ((fn).str)
#define FN_ALLOCATED(fn) ((fn).allocated)
#define FN_LENGTH(fn) ((fn).length)
/* Create a new empty fn. */
extern KPSEDLL fn_type fn_init (void);
/* Create a new fn from the first LEN characters from S and a null. */
extern KPSEDLL fn_type fn_copy0 (const_string s, unsigned len);
/* Free what's been allocated. Can also just free the string if it's
been extracted out. Fatal error if nothing allocated in F. */
extern KPSEDLL void fn_free (fn_type *f);
/* Append the character C to the fn F. Don't append trailing null. */
extern KPSEDLL void fn_1grow (fn_type *f, char c);
/* Append LENGTH bytes from SOURCE to F. */
extern KPSEDLL void fn_grow (fn_type *f, const_string source, unsigned length);
/* Concatenate the component S to the fn F. Assumes string currently in
F is null terminated. */
extern KPSEDLL void fn_str_grow (fn_type *f, const_string s);
/* Add a null to F's string at position LOC, and update its length.
Fatal error if LOC is past the end of the string. */
extern KPSEDLL void fn_shrink_to (fn_type *f, unsigned loc);
#endif /* not KPATHSEA_FN_H */
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