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 3 (01-FEB-1992 ST)#include <ctype.h> /* definition of |@!isalpha|, |@!isdigit| and so on */#include <stdbool.h> /* definition of |@!bool|, |@!true| and |@!false| */#include <stddef.h> /* definition of |@!ptrdiff_t| */#include <stdint.h> /* definition of |@!uint8_t| and |@!uint16_t| */#include <stdlib.h> /* definition of |@!getenv| and |@!exit| */#include <stdio.h> /* definition of |@!printf| and friends */#include <string.h> /* definition of |@!strlen|, |@!strcmp| and so on */@y#include ctype /* definition of |@!isalpha|, |@!isdigit| and so on */               /* VMS searches text libraries faster */#include stdbool /* definition of |@!bool|, |@!true| and |@!false| */#include stddef /* definition of |@!ptrdiff_t| */#include stdint /* definition of |@!uint8_t| and |@!uint16_t| */#include stdlib /* definition of |@!getenv| and |@!exit| */#include stdio /* definition of |@!printf| and friends */#include string /* definition of |@!strlen|, |@!strcmp| and so on */@z @x section 68 (01-FEB-1992 ST)programs are started. Here, for instance, we pass the operating systema status of |EXIT_SUCCESS| if and only if only harmless messages were printed.@yprograms are started. Here, for instance, we pass VAX/VMSa status of |SS$_NORMAL| if and only if only harmlessmessages have been printed.A suitable status to signal an error condition to VAX/VMS could be|SS$_ABORT|, telling the operating system toprint |"%SYSTEM-F-ABORT, abort"|, if |history > harmless_message|.@z @x section 68 (1987 BL) (01-FEB-1992 ST) (11-JAN-1993 DEK)  if (history > harmless_message) return EXIT_FAILURE;  else return EXIT_SUCCESS;@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 75 (01-FEB-1992 ST)An omitted change file argument means that |"/dev/null"| should be used,when no changes are desired.@yAn omitted change file argument means that thenull device |"NL:"| should be used, when no changes are desired.@z @x section 75 (1987 BL) (01-FEB-1992 ST) (05-APR-1992 DEK)  strcpy(change_file_name,"/dev/null");@y  strcpy(change_file_name,"NL:");	/* {\tt NL:} is the VAX/VMS notation for {\tt /dev/null} */@z @x section 85 (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