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