re PR fortran/21302 (Max line length in free form mode)

2005-11-30  Bernhard Fischer <rep.nop@aon.at>
	PR fortran/21302
	* lang.opt: New options -ffree-line-length- and -ffree-line-length-none.
	* gfortran.h: Add free_line_length and add description of
	free_line_length and fixed_line_length.
	* options.c (gfc_init_options, gfc_handle_option): Initialize
	and set free_line_length and fixed_line_length.
	* scanner.c (load_line): Set free_line_length to 132 and
	fixed_line_length to 72 or user requested values.
	* scanner.c: Typo in comment.
	* invoke.texi: Document -ffree-line-length- and
	-ffree-line-length-none

	gfortran.dg/line_length_1.f: New test:
	gfortran.dg/line_length_2.f90: Ditto.

From-SVN: r107745

6 files changed, 92 insertions, 18 deletions

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index a55a828..f787fb7 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,18 @@
+2005-11-30  Bernhard Fischer <rep.nop@aon.at>
+
+	PR fortran/21302
+	* lang.opt: New options -ffree-line-length- and -ffree-line-length-none.
+	* gfortran.h: Add free_line_length and add description of
+	free_line_length and fixed_line_length.
+	* options.c (gfc_init_options, gfc_handle_option): Initialize
+	and set free_line_length and fixed_line_length.
+	* scanner.c (load_line): Set free_line_length to 132 and
+	fixed_line_length to 72 or user requested values.
+	* scanner.c: Typo in comment.
+	* invoke.texi: Document -ffree-line-length- and
+	-ffree-line-length-none
+
+
 2005-11-30  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/15809
diff --git a/gcc/fortran/gfortran.h b/gcc/fortran/gfortran.h
index dd740194..83de267 100644
--- a/gcc/fortran/gfortran.h
+++ b/gcc/fortran/gfortran.h
@@ -1460,7 +1460,20 @@ typedef struct
 {
   char *module_dir;
   gfc_source_form source_form;
-  int fixed_line_length;
+  /* When fixed_line_length or free_line_length are 0, the whole line is used.
+
+     Default is -1, the maximum line length mandated by the respective source
+     form is used:
+     for FORM_FREE GFC_MAX_LINE (132)
+     else 72.
+
+     If fixed_line_length or free_line_length is not 0 nor -1 then the user has
+     requested a specific line-length.
+
+     If the user requests a fixed_line_length <7 then gfc_init_options()
+     emits a fatal error.  */
+  int fixed_line_length; /* maximum line length in fixed-form.  */
+  int free_line_length; /* maximum line length in free-form.  */
   int max_identifier_length;
   int verbose;
 
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi
index d482b32..5816207d 100644
--- a/gcc/fortran/invoke.texi
+++ b/gcc/fortran/invoke.texi
@@ -119,6 +119,7 @@ by type.  Explanations are in the following sections.
 -fdollar-ok  -fimplicit-none  -fmax-identifier-length @gol
 -std=@var{std} -fd-lines-as-code -fd-lines-as-comments @gol
 -ffixed-line-length-@var{n}  -ffixed-line-length-none @gol
+-ffree-line-length-@var{n}  -ffree-line-length-none @gol
 -fdefault-double-8  -fdefault-integer-8  -fdefault-real-8 @gol
 -fcray-pointer }
 
@@ -251,6 +252,20 @@ to them to fill out the line.
 @option{-ffixed-line-length-0} means the same thing as
 @option{-ffixed-line-length-none}.
 
+@cindex -ffree-line-length-@var{n} option
+@cindex options, -ffree-line-length-@var{n}
+@item -ffree-line-length-@var{n}
+@cindex source file format
+@cindex lines, length
+@cindex length of source lines
+@cindex free form
+@cindex limits, lengths of source lines
+Set column after which characters are ignored in typical free-form
+lines in the source file. For free-form, the default value is 132.
+@var{n} may be @samp{none}, meaning that the entire line is meaningful.
+@option{-ffree-line-length-0} means the same thing as
+@option{-ffree-line-length-none}.
+
 @cindex -fmax-identifier-length=@var{n} option
 @cindex option -fmax-identifier-length=@var{n}
 @item -fmax-identifier-length=@var{n}
diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt
index 66f79db..95388e5 100644
--- a/gcc/fortran/lang.opt
+++ b/gcc/fortran/lang.opt
@@ -141,6 +141,14 @@ ffixed-line-length-
 Fortran RejectNegative Joined UInteger
 -ffixed-line-length-<n>		Use n as character line width in fixed mode
 
+ffree-line-length-none
+Fortran RejectNegative
+Allow arbitrary character line width in free mode
+
+ffree-line-length-
+Fortran RejectNegative Joined UInteger
+-ffree-line-length-<n>		Use n as character line width in free mode
+
 fmax-identifier-length=
 Fortran RejectNegative Joined UInteger
 -fmax-identifier-length=<n>	Maximum identifier length
diff --git a/gcc/fortran/options.c b/gcc/fortran/options.c
index a39876b..64fa8a2 100644
--- a/gcc/fortran/options.c
+++ b/gcc/fortran/options.c
@@ -46,7 +46,8 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_source_file = NULL;
   gfc_option.module_dir = NULL;
   gfc_option.source_form = FORM_UNKNOWN;
-  gfc_option.fixed_line_length = 72;
+  gfc_option.fixed_line_length = -1;
+  gfc_option.free_line_length = -1;
   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
   gfc_option.verbose = 0;
 
@@ -423,10 +424,28 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.source_form = FORM_FIXED;
       break;
 
+    case OPT_ffixed_line_length_none:
+      gfc_option.fixed_line_length = 0;
+      break;
+
+    case OPT_ffixed_line_length_:
+      if (value != 0 && value < 7)
+	gfc_fatal_error ("Fixed line length must be at least seven.");
+      gfc_option.fixed_line_length = value;
+      break;
+
     case OPT_ffree_form:
       gfc_option.source_form = FORM_FREE;
       break;
 
+    case OPT_ffree_line_length_none:
+      gfc_option.free_line_length = 0;
+      break;
+
+    case OPT_ffree_line_length_:
+      gfc_option.free_line_length = value;
+      break;
+
     case OPT_funderscoring:
       gfc_option.flag_underscoring = value;
       break;
@@ -459,16 +478,6 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.flag_repack_arrays = value;
       break;
 
-    case OPT_ffixed_line_length_none:
-      gfc_option.fixed_line_length = 0;
-      break;
-
-    case OPT_ffixed_line_length_:
-      if (value != 0 && value < 7)
-	gfc_fatal_error ("Fixed line length must be at least seven.");
-      gfc_option.fixed_line_length = value;
-      break;
-
     case OPT_fmax_identifier_length_:
       if (value > GFC_MAX_SYMBOL_LEN)
 	gfc_fatal_error ("Maximum supported idenitifier length is %d",
diff --git a/gcc/fortran/scanner.c b/gcc/fortran/scanner.c
index 8835761..4b76f9c 100644
--- a/gcc/fortran/scanner.c
+++ b/gcc/fortran/scanner.c
@@ -694,7 +694,7 @@ gfc_gobble_whitespace (void)
    In fixed mode, we expand a tab that occurs within the statement
    label region to expand to spaces that leave the next character in
    the source region.
-   load_line returns wether the line was truncated.  */
+   load_line returns whether the line was truncated.  */
 
 static int
 load_line (FILE * input, char **pbuf, int *pbuflen)
@@ -703,11 +703,25 @@ load_line (FILE * input, char **pbuf, int *pbuflen)
   int trunc_flag = 0;
   char *buffer;
 
-  /* Determine the maximum allowed line length.  */
+  /* Determine the maximum allowed line length.
+     The default for free-form is GFC_MAX_LINE, for fixed-form or for
+     unknown form it is 72. Refer to the documentation in gfc_option_t.  */
   if (gfc_current_form == FORM_FREE)
-    maxlen = GFC_MAX_LINE;
+    {
+      if (gfc_option.free_line_length == -1)
+	maxlen = GFC_MAX_LINE;
+      else
+	maxlen = gfc_option.free_line_length;
+    }
+  else if (gfc_current_form == FORM_FIXED)
+    {
+      if (gfc_option.fixed_line_length == -1)
+	maxlen = 72;
+      else
+	maxlen = gfc_option.fixed_line_length;
+    }
   else
-    maxlen = gfc_option.fixed_line_length;
+    maxlen = 72;
 
   if (*pbuf == NULL)
     {
@@ -778,7 +792,7 @@ load_line (FILE * input, char **pbuf, int *pbuflen)
 	    }
 	}
       else if (i >= maxlen)
-	{			
+	{
 	  /* Truncate the rest of the line.  */
 	  for (;;)
 	    {
@@ -1055,7 +1069,7 @@ load_file (const char *filename, bool initial)
   line = NULL;
   line_len = 0;
 
-  for (;;) 
+  for (;;)
     {
       int trunc = load_line (input, &line, &line_len);