X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flanguage%2Fdata-io%2Fplacement-parser.c;h=eee5206b5b3d9775e886471c00e26cda9536cdee;hb=5e2c79af8a242eb36e62291277805933d5ad5903;hp=679049d73dd463dadc56e022066fad726d2f2ea7;hpb=9f4661992f4b481c6dafa6fd53c94ecfe7b3af8c;p=pspp-builds.git

diff --git a/src/language/data-io/placement-parser.c b/src/language/data-io/placement-parser.c
index 679049d7..eee5206b 100644
--- a/src/language/data-io/placement-parser.c
+++ b/src/language/data-io/placement-parser.c
@@ -26,6 +26,8 @@
 #include <libpspp/pool.h>
 #include <libpspp/str.h>
 
+#include <data/format.h>
+
 #include "xalloc.h"
 #include "xsize.h"
 
@@ -107,7 +109,7 @@ fixed_parse_columns (struct lexer *lexer, struct pool *pool, size_t var_cnt, boo
   int fc, lc;
   size_t i;
 
-  if ( !parse_column_range (lexer, &fc, &lc, NULL) )
+  if ( !parse_column_range (lexer, 1, &fc, &lc, NULL) )
     return false;
 
   /* Divide columns evenly. */
@@ -287,42 +289,57 @@ execute_placement_format (const struct fmt_spec *format,
     }
 }
 
+/* Parses a BASE-based column using LEXER.  Returns true and
+   stores a 1-based column number into *COLUMN if successful,
+   otherwise emits an error message and returns false. */
+static bool
+parse_column (struct lexer *lexer, int base, int *column)
+{
+  assert (base == 0 || base == 1);
+  if (!lex_force_int (lexer))
+    return false;
+  *column = lex_integer (lexer) - base + 1;
+  if (*column < 1)
+    {
+      if (base == 1)
+        msg (SE, _("Column positions for fields must be positive."));
+      else
+        msg (SE, _("Column positions for fields must not be negative."));
+      return false;
+    }
+  lex_get (lexer);
+  return true;
+}
+
 /* Parse a column or a range of columns, specified as a single
-   integer or two integer delimited by a dash.  Stores the range
+   integer or two integers delimited by a dash.  Stores the range
    in *FIRST_COLUMN and *LAST_COLUMN.  (If only a single integer
    is given, it is stored in both.)  If RANGE_SPECIFIED is
    non-null, then *RANGE_SPECIFIED is set to true if the syntax
    contained a dash, false otherwise.  Returns true if
    successful, false if the syntax was invalid or the values
-   specified did not make sense. */
+   specified did not make sense.
+
+   If BASE is 0, zero-based column numbers are parsed; if BASE is
+   1, 1-based column numbers are parsed.  Regardless of BASE, the
+   values stored in *FIRST_COLUMN and *LAST_COLUMN are
+   1-based. */
 bool
-parse_column_range (struct lexer *lexer, int *first_column, int *last_column,
+parse_column_range (struct lexer *lexer, int base,
+                    int *first_column, int *last_column,
                     bool *range_specified)
 {
   /* First column. */
-  if (!lex_force_int (lexer))
+  if (!parse_column (lexer, base, first_column))
     return false;
-  *first_column = lex_integer (lexer);
-  if (*first_column < 1)
-    {
-      msg (SE, _("Column positions for fields must be positive."));
-      return false;
-    }
-  lex_get (lexer);
 
   /* Last column. */
   lex_negative_to_dash (lexer);
   if (lex_match (lexer, '-'))
     {
-      if (!lex_force_int (lexer))
-	return false;
-      *last_column = lex_integer (lexer);
-      if (*last_column < 1)
-	{
-	  msg (SE, _("Column positions for fields must be positive."));
-	  return false;
-	}
-      else if (*last_column < *first_column)
+      if (!parse_column (lexer, base, last_column))
+        return false;
+      if (*last_column < *first_column)
 	{
 	  msg (SE, _("The ending column for a field must be "
 		     "greater than the starting column."));
@@ -331,7 +348,6 @@ parse_column_range (struct lexer *lexer, int *first_column, int *last_column,
 
       if (range_specified)
         *range_specified = true;
-      lex_get (lexer);
     }
   else
     {