Remove the hack that varied the first character of the output file name

if none was specified on the command line. This is not permitted by
POSIX, and no longer needed now that we have the -a option.

PR:		85099
Submitted by:	Toby Peterson (Apple Computer)

usr.bin/split/split.1

@@ -111,8 +111,8 @@ is not specified, two letters are used as the suffix.
 If the
 .Ar name
 argument is not specified, the file is split into lexically ordered
-files named with prefixes in the range of
-.Dq Li x-z
+files named with the prefix
+.Dq Li x
 and with suffixes as above.
 .Sh ENVIRONMENT
 The
@@ -139,12 +139,10 @@ A
 command appeared in
 .At v3 .
 .Sh BUGS
-For historical reasons, if you specify
-.Ar name ,
+For historical reasons,
 .Nm
 can only create 676 separate
 files.
-The default naming convention allows 2028 separate files.
 The
 .Fl a
 option can be used to work around this limitation.

usr.bin/split/split.c

@@ -319,16 +319,8 @@ newfile(void)
 		if ((maxfiles *= 26) <= 0)
 			errx(EX_USAGE, "suffix is too long (max %ld)", i);
 
-	/*
-	 * Hack to increase max files; original code wandered through
-	 * magic characters.
-	 */
-	if (fnum == maxfiles) {
-		if (!defname || fname[0] == 'z')
-			errx(EX_DATAERR, "too many files");
-		++fname[0];
-		fnum = 0;
-	}
+	if (fnum == maxfiles)
+		errx(EX_DATAERR, "too many files");
 
 	/* Generate suffix of sufflen letters */
 	tfnum = fnum;