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- /*
- * Display some help.
- * Just invoke another "less" to display the help file.
- *
- * {{ This makes this function very simple, and makes changing the
- * help file very easy, but it may present difficulties on
- * (non-Unix) systems which do not supply the "system()" function. }}
- */
-
- #include "less.h"
-
- #if __MSDOS__
- #include <io.h>
- #include <dir.h>
- #include <string.h>
- #include <stdlib.h>
- #ifndef TURBOC
- extern int output_mode;
- #endif
- #endif
-
- extern char *progname;
-
- public void
- help()
- {
- char *helpfile;
- char *cmd;
-
- helpfile = find_helpfile();
- if (helpfile == NULL)
- {
- error("Cannot find help file", NULL_PARG);
- return;
- }
- #if __MSDOS__
- putenv("LESS=-+v -+E -+s -mHPmHELP -- ?eEND -- Press g to see "
- "it again:Press RETURN for more., or q when done ");
- cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 50,
- sizeof(char));
- #ifdef TURBOC
- if (directvideo)
- sprintf(cmd, "-%s %s", progname, helpfile);
- else
- sprintf(cmd, "-%s -v %s", progname, helpfile);
- #else
- if (output_mode == 0)
- sprintf(cmd, "-%s %s", progname, helpfile);
- else
- sprintf(cmd, "-%s -qVW4,4,76,23,Help %s", progname, helpfile);
- #endif /* TURBOC */
- #else
- cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 150,
- sizeof(char));
- sprintf(cmd,
- "-%s -m -H -+E -+s '-PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done ' %s",
- progname, helpfile);
- free(helpfile);
- #endif
- lsystem(cmd);
- error("End of help", NULL_PARG);
- free(cmd);
- }
-