398 lines
11 KiB
C
398 lines
11 KiB
C
/* An abstract string datatype.
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Copyright (C) 1998, 1999, 2000, 2002, 2004 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
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it 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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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combined
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executable.)
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU 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
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the Free Software Foundation, 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include "libiberty.h"
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#include "dyn-string.h"
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/* Performs in-place initialization of a dyn_string struct. This
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function can be used with a dyn_string struct on the stack or
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embedded in another object. The contents of of the string itself
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are still dynamically allocated. The string initially is capable
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of holding at least SPACE characeters, including the terminating
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NUL. If SPACE is 0, it will silently be increated to 1.
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If RETURN_ON_ALLOCATION_FAILURE is defined and memory allocation
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fails, returns 0. Otherwise returns 1. */
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int
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dyn_string_init (struct dyn_string *ds_struct_ptr, int space)
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{
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/* We need at least one byte in which to store the terminating NUL. */
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if (space == 0)
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space = 1;
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#ifdef RETURN_ON_ALLOCATION_FAILURE
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ds_struct_ptr->s = (char *) malloc (space);
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if (ds_struct_ptr->s == NULL)
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return 0;
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#else
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ds_struct_ptr->s = XNEWVEC (char, space);
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#endif
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ds_struct_ptr->allocated = space;
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ds_struct_ptr->length = 0;
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ds_struct_ptr->s[0] = '\0';
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return 1;
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}
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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 will
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be silently increased to 1. If RETURN_ON_ALLOCATION_FAILURE is
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defined and memory allocation fails, returns NULL. Otherwise
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returns the newly allocated string. */
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dyn_string_t
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dyn_string_new (int space)
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{
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dyn_string_t result;
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#ifdef RETURN_ON_ALLOCATION_FAILURE
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result = (dyn_string_t) malloc (sizeof (struct dyn_string));
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if (result == NULL)
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return NULL;
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if (!dyn_string_init (result, space))
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{
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free (result);
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return NULL;
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}
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#else
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result = XNEW (struct dyn_string);
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dyn_string_init (result, space);
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#endif
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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 (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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/* Returns the contents of DS in a buffer allocated with malloc. It
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is the caller's responsibility to deallocate the buffer using free.
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DS is then set to the empty string. Deletes DS itself. */
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char*
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dyn_string_release (dyn_string_t ds)
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{
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/* Store the old buffer. */
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char* result = ds->s;
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/* The buffer is no longer owned by DS. */
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ds->s = NULL;
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/* Delete DS. */
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free (ds);
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/* Return the old buffer. */
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return result;
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}
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/* Increase the capacity of DS so it can hold at least SPACE
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characters, plus the terminating NUL. This function will not (at
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present) reduce the capacity of DS. Returns DS on success.
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If RETURN_ON_ALLOCATION_FAILURE is defined and a memory allocation
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operation fails, deletes DS and returns NULL. */
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dyn_string_t
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dyn_string_resize (dyn_string_t ds, int space)
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{
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int new_allocated = ds->allocated;
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/* Increase SPACE to hold the NUL termination. */
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++space;
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/* Increase allocation by factors of two. */
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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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ds->allocated = new_allocated;
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/* We actually need more space. */
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#ifdef RETURN_ON_ALLOCATION_FAILURE
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ds->s = (char *) realloc (ds->s, ds->allocated);
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if (ds->s == NULL)
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{
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free (ds);
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return NULL;
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}
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#else
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ds->s = XRESIZEVEC (char, ds->s, ds->allocated);
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#endif
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}
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return ds;
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}
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/* Sets the contents of DS to the empty string. */
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void
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dyn_string_clear (dyn_string_t ds)
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{
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/* A dyn_string always has room for at least the NUL terminator. */
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ds->s[0] = '\0';
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ds->length = 0;
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}
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/* Makes the contents of DEST the same as the contents of SRC. DEST
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and SRC must be distinct. Returns 1 on success. On failure, if
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RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
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int
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dyn_string_copy (dyn_string_t dest, dyn_string_t src)
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{
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if (dest == src)
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abort ();
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/* Make room in DEST. */
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if (dyn_string_resize (dest, src->length) == NULL)
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return 0;
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/* Copy DEST into SRC. */
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strcpy (dest->s, src->s);
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/* Update the size of DEST. */
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dest->length = src->length;
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return 1;
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}
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/* Copies SRC, a NUL-terminated string, into DEST. Returns 1 on
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success. On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST
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and returns 0. */
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int
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dyn_string_copy_cstr (dyn_string_t dest, const char *src)
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{
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int length = strlen (src);
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/* Make room in DEST. */
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if (dyn_string_resize (dest, length) == NULL)
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return 0;
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/* Copy DEST into SRC. */
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strcpy (dest->s, src);
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/* Update the size of DEST. */
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dest->length = length;
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return 1;
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}
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/* Inserts SRC at the beginning of DEST. DEST is expanded as
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necessary. SRC and DEST must be distinct. Returns 1 on success.
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On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and
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returns 0. */
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int
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dyn_string_prepend (dyn_string_t dest, dyn_string_t src)
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{
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return dyn_string_insert (dest, 0, src);
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}
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/* Inserts SRC, a NUL-terminated string, at the beginning of DEST.
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DEST is expanded as necessary. Returns 1 on success. On failure,
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if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
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int
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dyn_string_prepend_cstr (dyn_string_t dest, const char *src)
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{
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return dyn_string_insert_cstr (dest, 0, src);
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}
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/* Inserts SRC into DEST starting at position POS. DEST is expanded
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as necessary. SRC and DEST must be distinct. Returns 1 on
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success. On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST
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and returns 0. */
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int
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dyn_string_insert (dyn_string_t dest, int pos, dyn_string_t src)
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{
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int i;
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if (src == dest)
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abort ();
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if (dyn_string_resize (dest, dest->length + src->length) == NULL)
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return 0;
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/* Make room for the insertion. Be sure to copy the NUL. */
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for (i = dest->length; i >= pos; --i)
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dest->s[i + src->length] = dest->s[i];
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/* Splice in the new stuff. */
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strncpy (dest->s + pos, src->s, src->length);
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/* Compute the new length. */
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dest->length += src->length;
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return 1;
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}
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/* Inserts SRC, a NUL-terminated string, into DEST starting at
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position POS. DEST is expanded as necessary. Returns 1 on
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success. On failure, RETURN_ON_ALLOCATION_FAILURE, deletes DEST
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and returns 0. */
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int
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dyn_string_insert_cstr (dyn_string_t dest, int pos, const char *src)
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{
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int i;
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int length = strlen (src);
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if (dyn_string_resize (dest, dest->length + length) == NULL)
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return 0;
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/* Make room for the insertion. Be sure to copy the NUL. */
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for (i = dest->length; i >= pos; --i)
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dest->s[i + length] = dest->s[i];
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/* Splice in the new stuff. */
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strncpy (dest->s + pos, src, length);
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/* Compute the new length. */
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dest->length += length;
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return 1;
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}
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/* Inserts character C into DEST starting at position POS. DEST is
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expanded as necessary. Returns 1 on success. On failure,
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RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
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int
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dyn_string_insert_char (dyn_string_t dest, int pos, int c)
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{
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int i;
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if (dyn_string_resize (dest, dest->length + 1) == NULL)
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return 0;
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/* Make room for the insertion. Be sure to copy the NUL. */
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for (i = dest->length; i >= pos; --i)
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dest->s[i + 1] = dest->s[i];
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/* Add the new character. */
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dest->s[pos] = c;
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/* Compute the new length. */
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++dest->length;
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return 1;
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}
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/* Append S to DS, resizing DS if necessary. Returns 1 on success.
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On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and
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returns 0. */
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int
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dyn_string_append (dyn_string_t dest, dyn_string_t s)
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{
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if (dyn_string_resize (dest, dest->length + s->length) == 0)
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return 0;
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strcpy (dest->s + dest->length, s->s);
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dest->length += s->length;
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return 1;
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}
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/* Append the NUL-terminated string S to DS, resizing DS if necessary.
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Returns 1 on success. On failure, if RETURN_ON_ALLOCATION_FAILURE,
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deletes DEST and returns 0. */
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int
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dyn_string_append_cstr (dyn_string_t dest, const char *s)
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{
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int len = strlen (s);
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/* The new length is the old length plus the size of our string, plus
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one for the null at the end. */
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if (dyn_string_resize (dest, dest->length + len) == NULL)
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return 0;
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strcpy (dest->s + dest->length, s);
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dest->length += len;
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return 1;
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}
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/* Appends C to the end of DEST. Returns 1 on success. On failure,
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if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
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int
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dyn_string_append_char (dyn_string_t dest, int c)
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{
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/* Make room for the extra character. */
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if (dyn_string_resize (dest, dest->length + 1) == NULL)
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return 0;
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/* Append the character; it will overwrite the old NUL. */
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dest->s[dest->length] = c;
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/* Add a new NUL at the end. */
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dest->s[dest->length + 1] = '\0';
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/* Update the length. */
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++(dest->length);
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return 1;
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}
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/* Sets the contents of DEST to the substring of SRC starting at START
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and ending before END. START must be less than or equal to END,
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and both must be between zero and the length of SRC, inclusive.
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Returns 1 on success. On failure, if RETURN_ON_ALLOCATION_FAILURE,
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deletes DEST and returns 0. */
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int
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dyn_string_substring (dyn_string_t dest, dyn_string_t src,
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int start, int end)
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{
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int i;
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int length = end - start;
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if (start > end || start > src->length || end > src->length)
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abort ();
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/* Make room for the substring. */
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if (dyn_string_resize (dest, length) == NULL)
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return 0;
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/* Copy the characters in the substring, */
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for (i = length; --i >= 0; )
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dest->s[i] = src->s[start + i];
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/* NUL-terimate the result. */
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dest->s[length] = '\0';
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/* Record the length of the substring. */
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dest->length = length;
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return 1;
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}
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/* Returns non-zero if DS1 and DS2 have the same contents. */
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int
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dyn_string_eq (dyn_string_t ds1, dyn_string_t ds2)
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{
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/* If DS1 and DS2 have different lengths, they must not be the same. */
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if (ds1->length != ds2->length)
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return 0;
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else
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return !strcmp (ds1->s, ds2->s);
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}
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