101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
|
/* An abstract string datatype.
|
||
|
|
Copyright (C) 1998 Free Software Foundation, Inc.
|
||
|
|
Contributed by Mark Mitchell (mark@markmitchell.com).
|
||
|
|
|
||
|
|
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
|
||
|
|
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 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_t
|
||
|
|
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. */
|
||
|
|
|
||
|
|
void
|
||
|
|
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_t
|
||
|
|
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_t
|
||
|
|
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;
|
||
|
|
}
|