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/*
# varstring.h: variable-length strings.
#
# Copyright (C) 1992, 2011 Free Software Foundation, Inc.
#
# 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
#
*/
#ifndef VARSTRING_H
#define VARSTRING_H
#include "types.h"
/* Initialize a variable-length string. */
typedef struct
{
unsigned allocated;
unsigned used;
string data;
} variable_string;
/* The data characters. */
#define VS_CHARS(vs) ((vs).data)
/* This is the number of bytes allocated for the string. */
#define VS_ALLOCATED(vs) ((vs).allocated)
/* This is the number of bytes used. */
#define VS_USED(vs) ((vs).used)
/* Create a new structure, initializing the data to a null byte. */
extern variable_string vs_init (void);
/* Free the string. */
extern void vs_free (variable_string *);
/* Put NEW_CHAR at position POS in S. POS may be beyond the current
length of S. You are responsible for putting a null at the end of
the string when you are done constructing it, if you want one. */
extern void vs_set_char (variable_string *s, unsigned pos, char new_char);
/* Put NEW_CHAR at the end of V. As with `vs_set_char', no null is
appended. */
extern void vs_append_char (variable_string *v, char new_char);
/* Return concatenation of VS1 and VS2 in a new variable string. */
extern variable_string vs_concat (variable_string vs1, variable_string vs2);
#endif /* not VARSTRING_H */
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