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/* An abstract string datatype.
Copyright (C) 1998 Free Software Foundation, Inc.
Contributed by Mark Mitchell (
This file is part of GNU CC.
GNU CC 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.
GNU CC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to the Free
Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#include "system.h"
#include "gansidecl.h"
#include "dyn-string.h"
extern char *xmalloc ();
extern char *xrealloc ();
/* Create a new dynamic string capable of holding at least SPACE
characters, including the terminating NUL. If SPACE is 0, it
will be silently increased to 1. */
dyn_string_new (space)
int space;
dyn_string_t result = (dyn_string_t) xmalloc (sizeof (struct dyn_string));
if (space == 0)
/* We need at least one byte in which to store the terminating
NUL. */
space = 1;
result->allocated = space;
result->s = (char*) xmalloc (space);
result->length = 0;
result->s[0] = '\0';
return result;
/* Free the memory used by DS. */
dyn_string_delete (ds)
dyn_string_t ds;
free (ds->s);
free (ds);
/* Append the NUL-terminated string S to DS, resizing DS if
necessary. */
dyn_string_append (ds, s)
dyn_string_t ds;
char *s;
int len = strlen (s);
dyn_string_resize (ds, ds->length + len + 1 /* '\0' */);
strcpy (ds->s + ds->length, s);
ds->length += len;
return ds;
/* Increase the capacity of DS so that it can hold at least SPACE
characters, including the terminating NUL. This function will not
(at present) reduce the capacity of DS. */
dyn_string_resize (ds, space)
dyn_string_t ds;
int space;
int new_allocated = ds->allocated;
while (space > new_allocated)
new_allocated *= 2;
if (new_allocated != ds->allocated)
/* We actually need more space. */
ds->allocated = new_allocated;
ds->s = (char*) xrealloc (ds->s, ds->allocated);
return ds;