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-- GHDL Run Time (GRT) - variable strings.
-- Copyright (C) 2002 - 2014 Tristan Gingold
--
-- 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 2 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 <gnu.org/licenses>.
--
-- As a special exception, if other files instantiate generics from this
-- unit, or you link this unit with other files to produce an executable,
-- this unit does not by itself cause the resulting executable to be
-- covered by the GNU General Public License. This exception does not
-- however invalidate any other reasons why the executable file might be
-- covered by the GNU Public License.
with Grt.C; use Grt.C;
package body Grt.Vstrings is
procedure Free (Vstr : in out Vstring) is
begin
Free (To_Address (Vstr.Str));
Vstr := (Str => null,
Max => 0,
Len => 0);
end Free;
procedure Reset (Vstr : in out Vstring) is
begin
Vstr.Len := 0;
end Reset;
procedure Grow (Vstr : in out Vstring; Sum : Natural)
is
Nlen : constant Natural := Vstr.Len + Sum;
Nmax : Natural;
begin
Vstr.Len := Nlen;
if Nlen <= Vstr.Max then
return;
end if;
if Vstr.Max = 0 then
Nmax := 32;
else
Nmax := Vstr.Max;
end if;
while Nmax < Nlen loop
Nmax := Nmax * 2;
end loop;
Vstr.Str := To_Ghdl_C_String
(Realloc (To_Address (Vstr.Str), size_t (Nmax)));
if Vstr.Str = null then
-- Memory exhausted.
raise Storage_Error;
end if;
Vstr.Max := Nmax;
end Grow;
procedure Append (Vstr : in out Vstring; C : Character)
is
begin
Grow (Vstr, 1);
Vstr.Str (Vstr.Len) := C;
end Append;
procedure Append (Vstr : in out Vstring; Str : String)
is
S : constant Natural := Vstr.Len;
begin
Grow (Vstr, Str'Length);
Vstr.Str (S + 1 .. S + Str'Length) := Str;
end Append;
procedure Append (Vstr : in out Vstring; Str : Ghdl_C_String)
is
S : constant Natural := Vstr.Len;
L : constant Natural := strlen (Str);
begin
Grow (Vstr, L);
Vstr.Str (S + 1 .. S + L) := Str (1 .. L);
end Append;
function Length (Vstr : Vstring) return Natural is
begin
return Vstr.Len;
end Length;
procedure Truncate (Vstr : in out Vstring; Len : Natural) is
begin
if Len > Vstr.Len then
-- Incorrect length.
raise Constraint_Error;
end if;
Vstr.Len := Len;
end Truncate;
function Get_Address (Vstr : Vstring) return Address is
begin
return To_Address (Vstr.Str);
end Get_Address;
function Get_C_String (Vstr : Vstring) return Ghdl_C_String is
begin
return Vstr.Str;
end Get_C_String;
procedure Free (Rstr : in out Rstring) is
begin
Free (To_Address (Rstr.Str));
Rstr := (Str => null,
Max => 0,
First => 0);
end Free;
function Length (Rstr : Rstring) return Natural is
begin
return Rstr.Max + 1 - Rstr.First;
end Length;
procedure Grow (Rstr : in out Rstring; Min : Natural)
is
Len : constant Natural := Length (Rstr);
Nlen : constant Natural := Len + Min;
Nstr : Ghdl_C_String;
Nfirst : Natural;
Nmax : Natural;
begin
if Nlen <= Rstr.Max then
return;
end if;
if Rstr.Max = 0 then
Nmax := 32;
else
Nmax := Rstr.Max;
end if;
while Nmax < Nlen loop
Nmax := Nmax * 2;
end loop;
Nstr := To_Ghdl_C_String (Malloc (size_t (Nmax)));
Nfirst := Nmax + 1 - Len;
if Rstr.Str /= null then
Nstr (Nfirst .. Nmax) := Rstr.Str (Rstr.First .. Rstr.Max);
Free (To_Address (Rstr.Str));
end if;
Rstr := (Str => Nstr,
Max => Nmax,
First => Nfirst);
end Grow;
procedure Prepend (Rstr : in out Rstring; C : Character)
is
begin
Grow (Rstr, 1);
Rstr.First := Rstr.First - 1;
Rstr.Str (Rstr.First) := C;
end Prepend;
procedure Prepend (Rstr : in out Rstring; Str : String)
is
begin
Grow (Rstr, Str'Length);
Rstr.First := Rstr.First - Str'Length;
Rstr.Str (Rstr.First .. Rstr.First + Str'Length - 1) := Str;
end Prepend;
procedure Prepend (Rstr : in out Rstring; Str : Ghdl_C_String)
is
L : constant Natural := strlen (Str);
begin
Grow (Rstr, L);
Rstr.First := Rstr.First - L;
Rstr.Str (Rstr.First .. Rstr.First + L - 1) := Str (1 .. L);
end Prepend;
function Get_Address (Rstr : Rstring) return Address is
begin
return Rstr.Str (Rstr.First)'Address;
end Get_Address;
procedure Copy (Rstr : Rstring; Str : in out String; Len : out Natural)
is
begin
Len := Length (Rstr);
if Len > Str'Length then
Str := Rstr.Str (Rstr.First .. Rstr.First + Str'Length - 1);
else
Str (Str'First .. Str'First + Len - 1) :=
Rstr.Str (Rstr.First .. Rstr.First + Len - 1);
end if;
end Copy;
end Grt.Vstrings;
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