New option --output-file.

ChangeLog

@@ -1,3 +1,16 @@
+2002-11-12  Bruno Haible  <bruno@clisp.org>
+
+	* src/options.h (Output::get_output_file_name): New method.
+	(Output::_output_file_name): New field.
+	* src/options.icc (Options::get_output_file_name): New method.
+	* src/options.cc (Options::long_usage): Document option --output-file.
+	(Options::Options): Initialize _output_file_name.
+	(long_options): Add --output-file.
+	(Options::parse_options): Handle it.
+	* src/main.cc (main): Open the output file if given by name.
+	* doc/gperf.texi (Output File): New section.
+	* tests/test-6.exp: Update.
+
 2002-11-10  Bruno Haible  <bruno@clisp.org>
 
 	* src/input.cc (pretty_input_file_name): New function.

NEWS

@@ -2,6 +2,7 @@ New in 2.8:
 
 * Added option -m/--multiple-iterations that reduces the size of the
   generated table.
+* Added option --output that allows to specify the output file name.
 * If the input file is given by name, the output file will now contain
   #line directives referring to the input file.
 * Bug fixes.

doc/gperf.texi

@@ -7,7 +7,7 @@
 
 @c some day we should @include version.texi instead of defining
 @c these values at hand.
-@set UPDATED 9 November 2002
+@set UPDATED 12 November 2002
 @set EDITION 2.7.2
 @set VERSION 2.7.2
 @c ---------------------
@@ -550,6 +550,7 @@ help is readily available via the @samp{--help} option.  Here is the
 complete list of options.
 
 @menu
+* Output File::                 Specifying the Location of the Output File
 * Input Details::               Options that affect Interpretation of the Input File
 * Output Language::             Specifying the Language for the Output Code
 * Output Details::              Fine tuning Details in the Output Code
@@ -557,7 +558,18 @@ complete list of options.
 * Verbosity::                   Informative Output
 @end menu
 
-@node Input Details, Output Language, Options, Options
+@node Output File, Input Details, Options, Options
+@section Specifying the Location of the Output File
+
+@table @samp
+@item --output-file=@var{file}
+Allows you to specify the name of the file to which the output is written to.
+@end table
+
+The results are written to standard output if no output file is specified
+or if it is @samp{-}.
+
+@node Input Details, Output Language, Output File, Options
 @section Options that affect Interpretation of the Input File
 
 @table @samp

src/main.cc

@@ -22,6 +22,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "options.h"
 #include "input.h"
 #include "search.h"
@@ -78,6 +79,16 @@ main (int argc, char *argv[])
       searcher.optimize ();
       list = searcher._head;
 
+      /* Open the output file.  */
+      if (option.get_output_file_name ())
+        if (strcmp (option.get_output_file_name (), "-") != 0)
+          if (!freopen (option.get_output_file_name (), "w", stdout))
+            {
+              fprintf (stderr, "Cannot open output file '%s'\n",
+                       option.get_output_file_name ());
+              exit (1);
+            }
+
       {
         /* Output the hash function code.  */
         Output outputter (searcher._head,

src/options.cc

@@ -27,6 +27,7 @@
 #include <stdlib.h> /* declares atoi(), abs(), exit() */
 #include <string.h> /* declares strcmp() */
 #include <ctype.h>  /* declares isdigit() */
+#include <limits.h> /* defines CHAR_MAX */
 #include "getopt.h"
 #include "version.h"
 
@@ -84,6 +85,14 @@ Options::long_usage (FILE * stream) const
            "If a long option shows an argument as mandatory, then it is mandatory\n"
            "for the equivalent short option also.\n");
   fprintf (stream, "\n");
+  fprintf (stream,
+           "Output file location:\n");
+  fprintf (stream,
+           "      --output-file=FILE Write output to specified file.\n");
+  fprintf (stream,
+           "The results are written to standard output if no output file is specified\n"
+           "or if it is -.\n");
+  fprintf (stream, "\n");
   fprintf (stream,
            "Input file interpretation:\n");
   fprintf (stream,
@@ -417,6 +426,7 @@ PositionStringParser::nextPosition ()
 Options::Options ()
   : _option_word (C),
     _input_file_name (NULL),
+    _output_file_name (NULL),
     _iterations (0),
     _jump (DEFAULT_JUMP_VALUE),
     _initial_asso_value (0),
@@ -521,6 +531,7 @@ Options::~Options ()
 
 static const struct option long_options[] =
 {
+  { "output-file", required_argument, NULL, CHAR_MAX + 1 },
   { "delimiters", required_argument, NULL, 'e' },
   { "struct-type", no_argument, NULL, 't' },
   { "language", required_argument, NULL, 'L' },
@@ -826,6 +837,11 @@ Options::parse_options (int argc, char *argv[])
             _option_word |= SEVENBIT;
             break;
           }
+        case CHAR_MAX + 1:      /* Set the output file name. */
+          {
+            _output_file_name = /*getopt*/optarg;
+            break;
+          }
         default:
           short_usage (stderr);
           exit (1);

src/options.h

@@ -184,6 +184,9 @@ public:
   /* Returns the input file name.  */
   const char *          get_input_file_name () const;
 
+  /* Returns the output file name.  */
+  const char *          get_output_file_name () const;
+
   /* Returns the iterations value.  */
   int                   get_iterations () const;
 
@@ -250,6 +253,9 @@ private:
   /* Name of input file.  */
   char *                _input_file_name;
 
+  /* Name of output file.  */
+  char *                _output_file_name;
+
   /* Amount to iterate when a collision occurs.  */
   int                   _iterations;
 

src/options.icc

@@ -132,6 +132,13 @@ Options::get_input_file_name () const
   return _input_file_name;
 }
 
+/* Returns the output file name.  */
+INLINE const char *
+Options::get_output_file_name () const
+{
+  return _output_file_name;
+}
+
 /* Returns the iterations value.  */
 INLINE int
 Options::get_iterations () const

tests/test-6.exp

@@ -5,6 +5,11 @@ Usage: ../src/gperf [OPTION]... [INPUT-FILE]
 If a long option shows an argument as mandatory, then it is mandatory
 for the equivalent short option also.
 
+Output file location:
+      --output-file=FILE Write output to specified file.
+The results are written to standard output if no output file is specified
+or if it is -.
+
 Input file interpretation:
   -e, --delimiters=DELIMITER-LIST
                          Allow user to provide a string containing delimiters