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[/] [viterbi_decoder_axi4s/] [trunk/] [testbench/] [txt_util.vhd] - Blame information for rev 2

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library ieee;
use ieee.std_logic_1164.all;
use std.textio.all;
 
 
package txt_util is
 
    -- prints a message to the screen
    procedure print(text: string);
 
    -- prints the message when active
    -- useful for debug switches
    procedure print(active: boolean; text: string);
 
    -- converts std_logic into a character
    function chr(sl: std_logic) return character;
 
    -- converts std_logic into a string (1 to 1)
    function str(sl: std_logic) return string;
 
    -- converts std_logic_vector into a string (binary base)
    function str(slv: std_logic_vector) return string;
 
    -- converts boolean into a string
    function str(b: boolean) return string;
 
    -- converts an integer into a single character
    -- (can also be used for hex conversion and other bases)
    function chr(int: integer) return character;
 
    -- converts integer into string using specified base
    function str(int: integer; base: integer) return string;
 
    -- converts integer to string, using base 10
    function str(int: integer) return string;
 
    -- convert std_logic_vector into a string in hex format
    function hstr(slv: std_logic_vector) return string;
 
 
    -- functions to manipulate strings
    -----------------------------------
 
    -- convert a character to upper case
    function to_upper(c: character) return character;
 
    -- convert a character to lower case
    function to_lower(c: character) return character;
 
    -- convert a string to upper case
    function to_upper(s: string) return string;
 
    -- convert a string to lower case
    function to_lower(s: string) return string;
 
 
 
    -- functions to convert strings into other formats
    --------------------------------------------------
 
    -- converts a character into std_logic
    function to_std_logic(c: character) return std_logic;
 
    -- converts a string into std_logic_vector
    function to_std_logic_vector(s: string) return std_logic_vector;
 
 
 
    -- file I/O
    -----------
 
    -- read variable length string from input file
    procedure str_read(file in_file: TEXT;
                       res_string: out string);
 
    -- print string to a file and start new line
    procedure print(file out_file: TEXT;
                    new_string: in  string);
 
    -- print character to a file and start new line
    procedure print(file out_file: TEXT;
                    char:       in  character);
 
end txt_util;
 
 
 
 
package body txt_util is
 
 
 
   -- prints text to the screen
 
   procedure print(text: string) is
     variable msg_line: line;
     begin
       write(msg_line, text);
       writeline(output, msg_line);
   end print;
 
 
 
 
   -- prints text to the screen when active
 
   procedure print(active: boolean; text: string)  is
     begin
      if active then
         print(text);
      end if;
   end print;
 
 
   -- converts std_logic into a character
 
   function chr(sl: std_logic) return character is
    variable c: character;
    begin
      case sl is
         when 'U' => c:= 'U';
         when 'X' => c:= 'X';
         when '0' => c:= '0';
         when '1' => c:= '1';
         when 'Z' => c:= 'Z';
         when 'W' => c:= 'W';
         when 'L' => c:= 'L';
         when 'H' => c:= 'H';
         when '-' => c:= '-';
      end case;
    return c;
   end chr;
 
 
 
   -- converts std_logic into a string (1 to 1)
 
   function str(sl: std_logic) return string is
    variable s: string(1 to 1);
    begin
        s(1) := chr(sl);
        return s;
   end str;
 
 
 
   -- converts std_logic_vector into a string (binary base)
   -- (this also takes care of the fact that the range of
   --  a string is natural while a std_logic_vector may
   --  have an integer range)
 
   function str(slv: std_logic_vector) return string is
     variable result : string (1 to slv'length);
     variable r : integer;
   begin
     r := 1;
     for i in slv'range loop
        result(r) := chr(slv(i));
        r := r + 1;
     end loop;
     return result;
   end str;
 
 
   function str(b: boolean) return string is
 
    begin
       if b then
          return "true";
      else
        return "false";
       end if;
    end str;
 
 
   -- converts an integer into a character
   -- for 0 to 9 the obvious mapping is used, higher
   -- values are mapped to the characters A-Z
   -- (this is usefull for systems with base > 10)
   -- (adapted from Steve Vogwell's posting in comp.lang.vhdl)
 
   function chr(int: integer) return character is
    variable c: character;
   begin
        case int is
          when  0 => c := '0';
          when  1 => c := '1';
          when  2 => c := '2';
          when  3 => c := '3';
          when  4 => c := '4';
          when  5 => c := '5';
          when  6 => c := '6';
          when  7 => c := '7';
          when  8 => c := '8';
          when  9 => c := '9';
          when 10 => c := 'A';
          when 11 => c := 'B';
          when 12 => c := 'C';
          when 13 => c := 'D';
          when 14 => c := 'E';
          when 15 => c := 'F';
          when 16 => c := 'G';
          when 17 => c := 'H';
          when 18 => c := 'I';
          when 19 => c := 'J';
          when 20 => c := 'K';
          when 21 => c := 'L';
          when 22 => c := 'M';
          when 23 => c := 'N';
          when 24 => c := 'O';
          when 25 => c := 'P';
          when 26 => c := 'Q';
          when 27 => c := 'R';
          when 28 => c := 'S';
          when 29 => c := 'T';
          when 30 => c := 'U';
          when 31 => c := 'V';
          when 32 => c := 'W';
          when 33 => c := 'X';
          when 34 => c := 'Y';
          when 35 => c := 'Z';
          when others => c := '?';
        end case;
        return c;
    end chr;
 
 
 
   -- convert integer to string using specified base
   -- (adapted from Steve Vogwell's posting in comp.lang.vhdl)
 
   function str(int: integer; base: integer) return string is
 
    variable temp:      string(1 to 10);
    variable num:       integer;
    variable abs_int:   integer;
    variable len:       integer := 1;
    variable power:     integer := 1;
 
   begin
 
    -- bug fix for negative numbers
    abs_int := abs(int);
 
    num     := abs_int;
 
    while num >= base loop                     -- Determine how many
      len := len + 1;                          -- characters required
      num := num / base;                       -- to represent the
    end loop ;                                 -- number.
 
    for i in len downto 1 loop                 -- Convert the number to
      temp(i) := chr(abs_int/power mod base);  -- a string starting
      power := power * base;                   -- with the right hand
    end loop ;                                 -- side.
 
    -- return result and add sign if required
    if int < 0 then
       return '-'& temp(1 to len);
     else
       return temp(1 to len);
    end if;
 
   end str;
 
 
  -- convert integer to string, using base 10
  function str(int: integer) return string is
 
   begin
 
    return str(int, 10) ;
 
   end str;
 
 
 
   -- converts a std_logic_vector into a hex string.
   function hstr(slv: std_logic_vector) return string is
       variable hexlen: integer;
       variable longslv : std_logic_vector(67 downto 0) := (others => '0');
       variable hex : string(1 to 16);
       variable fourbit : std_logic_vector(3 downto 0);
     begin
       hexlen := (slv'left+1)/4;
       if (slv'left+1) mod 4 /= 0 then
         hexlen := hexlen + 1;
       end if;
       longslv(slv'left downto 0) := slv;
       for i in (hexlen -1) downto 0 loop
         fourbit := longslv(((i*4)+3) downto (i*4));
         case fourbit is
           when "0000" => hex(hexlen -I) := '0';
           when "0001" => hex(hexlen -I) := '1';
           when "0010" => hex(hexlen -I) := '2';
           when "0011" => hex(hexlen -I) := '3';
           when "0100" => hex(hexlen -I) := '4';
           when "0101" => hex(hexlen -I) := '5';
           when "0110" => hex(hexlen -I) := '6';
           when "0111" => hex(hexlen -I) := '7';
           when "1000" => hex(hexlen -I) := '8';
           when "1001" => hex(hexlen -I) := '9';
           when "1010" => hex(hexlen -I) := 'A';
           when "1011" => hex(hexlen -I) := 'B';
           when "1100" => hex(hexlen -I) := 'C';
           when "1101" => hex(hexlen -I) := 'D';
           when "1110" => hex(hexlen -I) := 'E';
           when "1111" => hex(hexlen -I) := 'F';
           when "ZZZZ" => hex(hexlen -I) := 'z';
           when "UUUU" => hex(hexlen -I) := 'u';
           when "XXXX" => hex(hexlen -I) := 'x';
           when others => hex(hexlen -I) := '?';
         end case;
       end loop;
       return hex(1 to hexlen);
     end hstr;
 
 
 
   -- functions to manipulate strings
   -----------------------------------
 
 
   -- convert a character to upper case
 
   function to_upper(c: character) return character is
 
      variable u: character;
 
    begin
 
       case c is
        when 'a' => u := 'A';
        when 'b' => u := 'B';
        when 'c' => u := 'C';
        when 'd' => u := 'D';
        when 'e' => u := 'E';
        when 'f' => u := 'F';
        when 'g' => u := 'G';
        when 'h' => u := 'H';
        when 'i' => u := 'I';
        when 'j' => u := 'J';
        when 'k' => u := 'K';
        when 'l' => u := 'L';
        when 'm' => u := 'M';
        when 'n' => u := 'N';
        when 'o' => u := 'O';
        when 'p' => u := 'P';
        when 'q' => u := 'Q';
        when 'r' => u := 'R';
        when 's' => u := 'S';
        when 't' => u := 'T';
        when 'u' => u := 'U';
        when 'v' => u := 'V';
        when 'w' => u := 'W';
        when 'x' => u := 'X';
        when 'y' => u := 'Y';
        when 'z' => u := 'Z';
        when others => u := c;
    end case;
 
      return u;
 
   end to_upper;
 
 
   -- convert a character to lower case
 
   function to_lower(c: character) return character is
 
      variable l: character;
 
    begin
 
       case c is
        when 'A' => l := 'a';
        when 'B' => l := 'b';
        when 'C' => l := 'c';
        when 'D' => l := 'd';
        when 'E' => l := 'e';
        when 'F' => l := 'f';
        when 'G' => l := 'g';
        when 'H' => l := 'h';
        when 'I' => l := 'i';
        when 'J' => l := 'j';
        when 'K' => l := 'k';
        when 'L' => l := 'l';
        when 'M' => l := 'm';
        when 'N' => l := 'n';
        when 'O' => l := 'o';
        when 'P' => l := 'p';
        when 'Q' => l := 'q';
        when 'R' => l := 'r';
        when 'S' => l := 's';
        when 'T' => l := 't';
        when 'U' => l := 'u';
        when 'V' => l := 'v';
        when 'W' => l := 'w';
        when 'X' => l := 'x';
        when 'Y' => l := 'y';
        when 'Z' => l := 'z';
        when others => l := c;
    end case;
 
      return l;
 
   end to_lower;
 
 
 
   -- convert a string to upper case
 
   function to_upper(s: string) return string is
 
     variable uppercase: string (s'range);
 
   begin
 
     for i in s'range loop
        uppercase(i):= to_upper(s(i));
     end loop;
     return uppercase;
 
   end to_upper;
 
 
 
   -- convert a string to lower case
 
   function to_lower(s: string) return string is
 
     variable lowercase: string (s'range);
 
   begin
 
     for i in s'range loop
        lowercase(i):= to_lower(s(i));
     end loop;
     return lowercase;
 
   end to_lower;
 
 
 
-- functions to convert strings into other types
 
 
-- converts a character into a std_logic
 
function to_std_logic(c: character) return std_logic is
    variable sl: std_logic;
    begin
      case c is
        when 'U' =>
           sl := 'U';
        when 'X' =>
           sl := 'X';
        when '0' =>
           sl := '0';
        when '1' =>
           sl := '1';
        when 'Z' =>
           sl := 'Z';
        when 'W' =>
           sl := 'W';
        when 'L' =>
           sl := 'L';
        when 'H' =>
           sl := 'H';
        when '-' =>
           sl := '-';
        when others =>
           sl := 'X';
    end case;
   return sl;
  end to_std_logic;
 
 
-- converts a string into std_logic_vector
 
function to_std_logic_vector(s: string) return std_logic_vector is
  variable slv: std_logic_vector(s'high-s'low downto 0);
  variable k: integer;
begin
   k := s'high-s'low;
  for i in s'range loop
     slv(k) := to_std_logic(s(i));
     k      := k - 1;
  end loop;
  return slv;
end to_std_logic_vector;
 
 
 
 
 
 
----------------
--  file I/O  --
----------------
 
 
 
-- read variable length string from input file
 
procedure str_read(file in_file: TEXT;
                   res_string: out string) is
 
       variable l:         line;
       variable c:         character;
       variable is_string: boolean;
 
   begin
 
     readline(in_file, l);
     -- clear the contents of the result string
     for i in res_string'range loop
         res_string(i) := ' ';
     end loop;
     -- read all characters of the line, up to the length  
     -- of the results string
     for i in res_string'range loop
        read(l, c, is_string);
        res_string(i) := c;
        if not is_string then -- found end of line
           exit;
        end if;
     end loop;
 
end str_read;
 
 
-- print string to a file
procedure print(file out_file: TEXT;
                new_string: in  string) is
 
       variable l: line;
 
   begin
 
     write(l, new_string);
     writeline(out_file, l);
 
end print;
 
 
-- print character to a file and start new line
procedure print(file out_file: TEXT;
                char: in  character) is
 
       variable l: line;
 
   begin
 
     write(l, char);
     writeline(out_file, l);
 
end print;
 
 
 
-- appends contents of a string to a file until line feed occurs
-- (LF is considered to be the end of the string)
 
procedure str_write(file out_file: TEXT;
                    new_string: in  string) is
 begin
 
   for i in new_string'range loop
      print(out_file, new_string(i));
      if new_string(i) = LF then -- end of string
         exit;
      end if;
   end loop;
 
end str_write;
 
 
 
 
end txt_util;
 
 
 
 

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Subversion Repositories viterbi_decoder_axi4s

[/] [viterbi_decoder_axi4s/] [trunk/] [testbench/] [txt_util.vhd] - Blame information for rev 2

Line No.	Rev	Author	Line
1	2	mfehrenz	`library ieee;`
2			`use ieee.std_logic_1164.all;`
3			`use std.textio.all;`
4
5
6			`package txt_util is`
7
8			`-- prints a message to the screen`
9			`procedure print(text: string);`
10
11			`-- prints the message when active`
12			`-- useful for debug switches`
13			`procedure print(active: boolean; text: string);`
14
15			`-- converts std_logic into a character`
16			`function chr(sl: std_logic) return character;`
17
18			`-- converts std_logic into a string (1 to 1)`
19			`function str(sl: std_logic) return string;`
20
21			`-- converts std_logic_vector into a string (binary base)`
22			`function str(slv: std_logic_vector) return string;`
23
24			`-- converts boolean into a string`
25			`function str(b: boolean) return string;`
26
27			`-- converts an integer into a single character`
28			`-- (can also be used for hex conversion and other bases)`
29			`function chr(int: integer) return character;`
30
31			`-- converts integer into string using specified base`
32			`function str(int: integer; base: integer) return string;`
33
34			`-- converts integer to string, using base 10`
35			`function str(int: integer) return string;`
36
37			`-- convert std_logic_vector into a string in hex format`
38			`function hstr(slv: std_logic_vector) return string;`
39
40
41			`-- functions to manipulate strings`
42			`-----------------------------------`
43
44			`-- convert a character to upper case`
45			`function to_upper(c: character) return character;`
46
47			`-- convert a character to lower case`
48			`function to_lower(c: character) return character;`
49
50			`-- convert a string to upper case`
51			`function to_upper(s: string) return string;`
52
53			`-- convert a string to lower case`
54			`function to_lower(s: string) return string;`
55
56
57
58			`-- functions to convert strings into other formats`
59			`--------------------------------------------------`
60
61			`-- converts a character into std_logic`
62			`function to_std_logic(c: character) return std_logic;`
63
64			`-- converts a string into std_logic_vector`
65			`function to_std_logic_vector(s: string) return std_logic_vector;`
66
67
68
69			`-- file I/O`
70			`-----------`
71
72			`-- read variable length string from input file`
73			`procedure str_read(file in_file: TEXT;`
74			`res_string: out string);`
75
76			`-- print string to a file and start new line`
77			`procedure print(file out_file: TEXT;`
78			`new_string: in string);`
79
80			`-- print character to a file and start new line`
81			`procedure print(file out_file: TEXT;`
82			`char: in character);`
83
84			`end txt_util;`
85
86
87
88
89			`package body txt_util is`
90
91
92
93			`-- prints text to the screen`
94
95			`procedure print(text: string) is`
96			`variable msg_line: line;`
97			`begin`
98			`write(msg_line, text);`
99			`writeline(output, msg_line);`
100			`end print;`
101
102
103
104
105			`-- prints text to the screen when active`
106
107			`procedure print(active: boolean; text: string) is`
108			`begin`
109			`if active then`
110			`print(text);`
111			`end if;`
112			`end print;`
113
114
115			`-- converts std_logic into a character`
116
117			`function chr(sl: std_logic) return character is`
118			`variable c: character;`
119			`begin`
120			`case sl is`
121			`when 'U' => c:= 'U';`
122			`when 'X' => c:= 'X';`
123			`when '0' => c:= '0';`
124			`when '1' => c:= '1';`
125			`when 'Z' => c:= 'Z';`
126			`when 'W' => c:= 'W';`
127			`when 'L' => c:= 'L';`
128			`when 'H' => c:= 'H';`
129			`when '-' => c:= '-';`
130			`end case;`
131			`return c;`
132			`end chr;`
133
134
135
136			`-- converts std_logic into a string (1 to 1)`
137
138			`function str(sl: std_logic) return string is`
139			`variable s: string(1 to 1);`
140			`begin`
141			`s(1) := chr(sl);`
142			`return s;`
143			`end str;`
144
145
146
147			`-- converts std_logic_vector into a string (binary base)`
148			`-- (this also takes care of the fact that the range of`
149			`-- a string is natural while a std_logic_vector may`
150			`-- have an integer range)`
151
152			`function str(slv: std_logic_vector) return string is`
153			`variable result : string (1 to slv'length);`
154			`variable r : integer;`
155			`begin`
156			`r := 1;`
157			`for i in slv'range loop`
158			`result(r) := chr(slv(i));`
159			`r := r + 1;`
160			`end loop;`
161			`return result;`
162			`end str;`
163
164
165			`function str(b: boolean) return string is`
166
167			`begin`
168			`if b then`
169			`return "true";`
170			`else`
171			`return "false";`
172			`end if;`
173			`end str;`
174
175
176			`-- converts an integer into a character`
177			`-- for 0 to 9 the obvious mapping is used, higher`
178			`-- values are mapped to the characters A-Z`
179			`-- (this is usefull for systems with base > 10)`
180			`-- (adapted from Steve Vogwell's posting in comp.lang.vhdl)`
181
182			`function chr(int: integer) return character is`
183			`variable c: character;`
184			`begin`
185			`case int is`
186			`when 0 => c := '0';`
187			`when 1 => c := '1';`
188			`when 2 => c := '2';`
189			`when 3 => c := '3';`
190			`when 4 => c := '4';`
191			`when 5 => c := '5';`
192			`when 6 => c := '6';`
193			`when 7 => c := '7';`
194			`when 8 => c := '8';`
195			`when 9 => c := '9';`
196			`when 10 => c := 'A';`
197			`when 11 => c := 'B';`
198			`when 12 => c := 'C';`
199			`when 13 => c := 'D';`
200			`when 14 => c := 'E';`
201			`when 15 => c := 'F';`
202			`when 16 => c := 'G';`
203			`when 17 => c := 'H';`
204			`when 18 => c := 'I';`
205			`when 19 => c := 'J';`
206			`when 20 => c := 'K';`
207			`when 21 => c := 'L';`
208			`when 22 => c := 'M';`
209			`when 23 => c := 'N';`
210			`when 24 => c := 'O';`
211			`when 25 => c := 'P';`
212			`when 26 => c := 'Q';`
213			`when 27 => c := 'R';`
214			`when 28 => c := 'S';`
215			`when 29 => c := 'T';`
216			`when 30 => c := 'U';`
217			`when 31 => c := 'V';`
218			`when 32 => c := 'W';`
219			`when 33 => c := 'X';`
220			`when 34 => c := 'Y';`
221			`when 35 => c := 'Z';`
222			`when others => c := '?';`
223			`end case;`
224			`return c;`
225			`end chr;`
226
227
228
229			`-- convert integer to string using specified base`
230			`-- (adapted from Steve Vogwell's posting in comp.lang.vhdl)`
231
232			`function str(int: integer; base: integer) return string is`
233
234			`variable temp: string(1 to 10);`
235			`variable num: integer;`
236			`variable abs_int: integer;`
237			`variable len: integer := 1;`
238			`variable power: integer := 1;`
239
240			`begin`
241
242			`-- bug fix for negative numbers`
243			`abs_int := abs(int);`
244
245			`num := abs_int;`
246
247			`while num >= base loop -- Determine how many`
248			`len := len + 1; -- characters required`
249			`num := num / base; -- to represent the`
250			`end loop ; -- number.`
251
252			`for i in len downto 1 loop -- Convert the number to`
253			`temp(i) := chr(abs_int/power mod base); -- a string starting`
254			`power := power * base; -- with the right hand`
255			`end loop ; -- side.`
256
257			`-- return result and add sign if required`
258			`if int < 0 then`
259			`return '-'& temp(1 to len);`
260			`else`
261			`return temp(1 to len);`
262			`end if;`
263
264			`end str;`
265
266
267			`-- convert integer to string, using base 10`
268			`function str(int: integer) return string is`
269
270			`begin`
271
272			`return str(int, 10) ;`
273
274			`end str;`
275
276
277
278			`-- converts a std_logic_vector into a hex string.`
279			`function hstr(slv: std_logic_vector) return string is`
280			`variable hexlen: integer;`
281			`variable longslv : std_logic_vector(67 downto 0) := (others => '0');`
282			`variable hex : string(1 to 16);`
283			`variable fourbit : std_logic_vector(3 downto 0);`
284			`begin`
285			`hexlen := (slv'left+1)/4;`
286			`if (slv'left+1) mod 4 /= 0 then`
287			`hexlen := hexlen + 1;`
288			`end if;`
289			`longslv(slv'left downto 0) := slv;`
290			`for i in (hexlen -1) downto 0 loop`
291			`fourbit := longslv(((i4)+3) downto (i4));`
292			`case fourbit is`
293			`when "0000" => hex(hexlen -I) := '0';`
294			`when "0001" => hex(hexlen -I) := '1';`
295			`when "0010" => hex(hexlen -I) := '2';`
296			`when "0011" => hex(hexlen -I) := '3';`
297			`when "0100" => hex(hexlen -I) := '4';`
298			`when "0101" => hex(hexlen -I) := '5';`
299			`when "0110" => hex(hexlen -I) := '6';`
300			`when "0111" => hex(hexlen -I) := '7';`
301			`when "1000" => hex(hexlen -I) := '8';`
302			`when "1001" => hex(hexlen -I) := '9';`
303			`when "1010" => hex(hexlen -I) := 'A';`
304			`when "1011" => hex(hexlen -I) := 'B';`
305			`when "1100" => hex(hexlen -I) := 'C';`
306			`when "1101" => hex(hexlen -I) := 'D';`
307			`when "1110" => hex(hexlen -I) := 'E';`
308			`when "1111" => hex(hexlen -I) := 'F';`
309			`when "ZZZZ" => hex(hexlen -I) := 'z';`
310			`when "UUUU" => hex(hexlen -I) := 'u';`
311			`when "XXXX" => hex(hexlen -I) := 'x';`
312			`when others => hex(hexlen -I) := '?';`
313			`end case;`
314			`end loop;`
315			`return hex(1 to hexlen);`
316			`end hstr;`
317
318
319
320			`-- functions to manipulate strings`
321			`-----------------------------------`
322
323
324			`-- convert a character to upper case`
325
326			`function to_upper(c: character) return character is`
327
328			`variable u: character;`
329
330			`begin`
331
332			`case c is`
333			`when 'a' => u := 'A';`
334			`when 'b' => u := 'B';`
335			`when 'c' => u := 'C';`
336			`when 'd' => u := 'D';`
337			`when 'e' => u := 'E';`
338			`when 'f' => u := 'F';`
339			`when 'g' => u := 'G';`
340			`when 'h' => u := 'H';`
341			`when 'i' => u := 'I';`
342			`when 'j' => u := 'J';`
343			`when 'k' => u := 'K';`
344			`when 'l' => u := 'L';`
345			`when 'm' => u := 'M';`
346			`when 'n' => u := 'N';`
347			`when 'o' => u := 'O';`
348			`when 'p' => u := 'P';`
349			`when 'q' => u := 'Q';`
350			`when 'r' => u := 'R';`
351			`when 's' => u := 'S';`
352			`when 't' => u := 'T';`
353			`when 'u' => u := 'U';`
354			`when 'v' => u := 'V';`
355			`when 'w' => u := 'W';`
356			`when 'x' => u := 'X';`
357			`when 'y' => u := 'Y';`
358			`when 'z' => u := 'Z';`
359			`when others => u := c;`
360			`end case;`
361
362			`return u;`
363
364			`end to_upper;`
365
366
367			`-- convert a character to lower case`
368
369			`function to_lower(c: character) return character is`
370
371			`variable l: character;`
372
373			`begin`
374
375			`case c is`
376			`when 'A' => l := 'a';`
377			`when 'B' => l := 'b';`
378			`when 'C' => l := 'c';`
379			`when 'D' => l := 'd';`
380			`when 'E' => l := 'e';`
381			`when 'F' => l := 'f';`
382			`when 'G' => l := 'g';`
383			`when 'H' => l := 'h';`
384			`when 'I' => l := 'i';`
385			`when 'J' => l := 'j';`
386			`when 'K' => l := 'k';`
387			`when 'L' => l := 'l';`
388			`when 'M' => l := 'm';`
389			`when 'N' => l := 'n';`
390			`when 'O' => l := 'o';`
391			`when 'P' => l := 'p';`
392			`when 'Q' => l := 'q';`
393			`when 'R' => l := 'r';`
394			`when 'S' => l := 's';`
395			`when 'T' => l := 't';`
396			`when 'U' => l := 'u';`
397			`when 'V' => l := 'v';`
398			`when 'W' => l := 'w';`
399			`when 'X' => l := 'x';`
400			`when 'Y' => l := 'y';`
401			`when 'Z' => l := 'z';`
402			`when others => l := c;`
403			`end case;`
404
405			`return l;`
406
407			`end to_lower;`
408
409
410
411			`-- convert a string to upper case`
412
413			`function to_upper(s: string) return string is`
414
415			`variable uppercase: string (s'range);`
416
417			`begin`
418
419			`for i in s'range loop`
420			`uppercase(i):= to_upper(s(i));`
421			`end loop;`
422			`return uppercase;`
423
424			`end to_upper;`
425
426
427
428			`-- convert a string to lower case`
429
430			`function to_lower(s: string) return string is`
431
432			`variable lowercase: string (s'range);`
433
434			`begin`
435
436			`for i in s'range loop`
437			`lowercase(i):= to_lower(s(i));`
438			`end loop;`
439			`return lowercase;`
440
441			`end to_lower;`
442
443
444
445			`-- functions to convert strings into other types`
446
447
448			`-- converts a character into a std_logic`
449
450			`function to_std_logic(c: character) return std_logic is`
451			`variable sl: std_logic;`
452			`begin`
453			`case c is`
454			`when 'U' =>`
455			`sl := 'U';`
456			`when 'X' =>`
457			`sl := 'X';`
458			`when '0' =>`
459			`sl := '0';`
460			`when '1' =>`
461			`sl := '1';`
462			`when 'Z' =>`
463			`sl := 'Z';`
464			`when 'W' =>`
465			`sl := 'W';`
466			`when 'L' =>`
467			`sl := 'L';`
468			`when 'H' =>`
469			`sl := 'H';`
470			`when '-' =>`
471			`sl := '-';`
472			`when others =>`
473			`sl := 'X';`
474			`end case;`
475			`return sl;`
476			`end to_std_logic;`
477
478
479			`-- converts a string into std_logic_vector`
480
481			`function to_std_logic_vector(s: string) return std_logic_vector is`
482			`variable slv: std_logic_vector(s'high-s'low downto 0);`
483			`variable k: integer;`
484			`begin`
485			`k := s'high-s'low;`
486			`for i in s'range loop`
487			`slv(k) := to_std_logic(s(i));`
488			`k := k - 1;`
489			`end loop;`
490			`return slv;`
491			`end to_std_logic_vector;`
492
493
494
495
496
497
498			`----------------`
499			`-- file I/O --`
500			`----------------`
501
502
503
504			`-- read variable length string from input file`
505
506			`procedure str_read(file in_file: TEXT;`
507			`res_string: out string) is`
508
509			`variable l: line;`
510			`variable c: character;`
511			`variable is_string: boolean;`
512
513			`begin`
514
515			`readline(in_file, l);`
516			`-- clear the contents of the result string`
517			`for i in res_string'range loop`
518			`res_string(i) := ' ';`
519			`end loop;`
520			`-- read all characters of the line, up to the length`
521			`-- of the results string`
522			`for i in res_string'range loop`
523			`read(l, c, is_string);`
524			`res_string(i) := c;`
525			`if not is_string then -- found end of line`
526			`exit;`
527			`end if;`
528			`end loop;`
529
530			`end str_read;`
531
532
533			`-- print string to a file`
534			`procedure print(file out_file: TEXT;`
535			`new_string: in string) is`
536
537			`variable l: line;`
538
539			`begin`
540
541			`write(l, new_string);`
542			`writeline(out_file, l);`
543
544			`end print;`
545
546
547			`-- print character to a file and start new line`
548			`procedure print(file out_file: TEXT;`
549			`char: in character) is`
550
551			`variable l: line;`
552
553			`begin`
554
555			`write(l, char);`
556			`writeline(out_file, l);`
557
558			`end print;`
559
560
561
562			`-- appends contents of a string to a file until line feed occurs`
563			`-- (LF is considered to be the end of the string)`
564
565			`procedure str_write(file out_file: TEXT;`
566			`new_string: in string) is`
567			`begin`
568
569			`for i in new_string'range loop`
570			`print(out_file, new_string(i));`
571			`if new_string(i) = LF then -- end of string`
572			`exit;`
573			`end if;`
574			`end loop;`
575
576			`end str_write;`
577
578
579
580
581			`end txt_util;`
582
583
584
585