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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /web/c_cpp/cweb/comm-vms.ch
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+This is the change file for CWEB's COMMON under VAX/VMS.
+
+created:
+ 1987 BL (Bjorn Larsen, University of Oslo)
+
+modified:
+ 01-FEB-1992 ST (Stephan Trebels <trebels@ams02.dnet.gwdg.de>)
+ > include ctype,stdio,ssdef from textlibrary SYS$SHARE:VAXCDEF.TLB
+ > change error return code to SS$_ABORT
+ (perhaps better than %NONAME-E-NOMSG, Message number 2 )
+
+(also modified by Don Knuth to match changes in the master file)
+(only the two changes by BL are necessary for initial bootstrapping
+ via hand-editing of common.c)
+
+@x section 5 (01-FEB-1992 ST)
+#include <ctype.h>
+@y
+#include ctype /* VMS searches Textlibraries faster */
+@z
+
+@x section 8 (01-FEB-1992 ST)
+#include <stdio.h>
+@y
+#include stdio /* VMS searches Textlibraries faster */
+@z
+
+@x section 61 (01-FEB-1992 ST)
+programs are started. Here, for instance, we pass the operating system
+a status of 0 if and only if only harmless messages were printed.
+@y
+programs are started. Here, for instance, we pass VAX/VMS
+a status of |SS$_NORMAL| if and only if only harmless
+messages have been printed.
+A suitable status to signal an error condition to VAX/VMS could be
+|SS$_ABORT|, telling the operating system to
+print |"%SYSTEM-F-ABORT, abort"|, if |history > harmless_message|.
+@z
+
+@x section 61 (1987 BL) (01-FEB-1992 ST) (11-JAN-1993 DEK)
+ if (history > harmless_message) return(1);
+ else return(0);
+@y
+/*
+ VAX/VMS and UNIX have different error status conventions.
+ VAX/VMS uses odd values (for example |SS$_NORMAL|) to indicate success,
+ even values indicate errors, resulting in messages displayed
+ on the screen. |SS$_ABORT| has been chosen, to indicate an
+ error and display something that's not complete nonsense.
+*/
+ if (history > harmless_message) exit(SS$_ABORT);
+ else exit(SS$_NORMAL);
+@z
+
+@x section 69 (01-FEB-1992 ST)
+An omitted change file argument means that |"/dev/null"| should be used,
+when no changes are desired.
+@y
+An omitted change file argument means that the
+null device |"NL:"| should be used, when no changes are desired.
+@z
+
+@x section 70 (1987 BL) (01-FEB-1992 ST) (05-APR-1992 DEK)
+ if (found_change<=0) strcpy(change_file_name,"/dev/null");
+@y
+ if (found_change<=) strcpy(change_file_name,"NL:");
+ /* {\tt NL:} is the VAX/VMS notation for {\tt /dev/null} */
+@z
+
+@x section 82 (01-FEB-1992 ST)
+@** Index.
+@y
+@* VAX/VMS specific code.
+We have used |SS$_NORMAL| and |SS$_ABORT| as return codes,
+so we have to include the system message codes.
+
+@<Include files@>=
+#include ssdef /* we need VAX/VMS system messages */
+
+@** Index.
+@z