X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=doc%2Fdev%2Fsystem-file-format.texi;h=b1be385334bf5ef3f8aa1adfcfdecb10d9adaf3d;hb=e624e2da6ea68d22e6d4fba4eaa96d37d07a6730;hp=193c66012c3fde1b37f15b8f0c3a0eaddb22e067;hpb=a9acce47d67e0ab35ce1690e4f1b1ac0121c2d78;p=pspp-builds.git

diff --git a/doc/dev/system-file-format.texi b/doc/dev/system-file-format.texi
index 193c6601..b1be3853 100644
--- a/doc/dev/system-file-format.texi
+++ b/doc/dev/system-file-format.texi
@@ -606,7 +606,7 @@ int32               count;
 
 /* @r{Repeated @code{count} times}. */
 int32               measure;
-int32               width;
+int32               width;           /* @r{Not always present.} */
 int32               alignment;
 @end example
 
@@ -622,7 +622,7 @@ The size of @code{int32}.  Always set to 4.
 
 @item int32 count;
 The number of sets of variable display parameters (ordinarily the
-number of variables in the dictionary), times 3.
+number of variables in the dictionary), times 2 or 3.
 @end table
 
 The remaining members are repeated @code{count} times, in the same
@@ -648,6 +648,10 @@ as nominal scale.
 @item int32 width;
 The width of the display column for the variable in characters.
 
+This field is present if @var{count} is 3 times the number of
+variables in the dictionary.  It is omitted if @var{count} is 2 times
+the number of variables.
+
 @item int32 alignment;
 The alignment of the variable for display purposes:
 
@@ -880,6 +884,9 @@ value @var{code} - @var{bias}, where
 variable @code{bias} from the file header.  For example,
 code 105 with bias 100.0 (the normal value) indicates a numeric variable
 of value 5.
+One file has been seen written by SPSS 14 that contained such a code
+in a @emph{string} field with the value 0 (after the bias is
+subtracted) as a way of encoding null bytes.
 
 @item 252
 End of file.  This code may or may not appear at the end of the data