mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Utilities/s/hour

   1 ;
   2 ; hour_util.s
   3 ;
   4 ; Fiddle with hourglass from command line
   5 ;
   6 ; © 1994-1998 Straylight
   7 ;
   8
   9 ;----- Licensing note -------------------------------------------------------
  10 ;
  11 ; This file is part of Straylight's core utilities (coreutils).
  12 ;
  13 ; Coreutils is free software; you can redistribute it and/or modify
  14 ; it under the terms of the GNU General Public License as published by
  15 ; the Free Software Foundation; either version 2, or (at your option)
  16 ; any later version.
  17 ;
  18 ; Coreutils is distributed in the hope that it will be useful,
  19 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ; GNU General Public License for more details.
  22 ;
  23 ; You should have received a copy of the GNU General Public License
  24 ; along with Coreutils.  If not, write to the Free Software Foundation,
  25 ; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26
  27 ;----- Standard header ------------------------------------------------------
  28
  29                 GET     libs:header
  30                 GET     libs:swis
  31
  32                 GET     libs:stream
  33
  34 ;----- External dependencies ------------------------------------------------
  35
  36                 IMPORT  version
  37
  38 ;----- Main code ------------------------------------------------------------
  39
  40                 GBLA    count
  41
  42                 AREA    |!!!Util$$Code|,CODE,READONLY
  43
  44 main            ROUT
  45
  46                 STMFD   R13!,{R14}              ;Save the return address
  47                 ADR     R0,hour__cmdDef         ;Point to command definition
  48                 MOV     R2,R12                  ;Point to a workspace buffer
  49                 MOV     R3,#256                 ;Size of the buffer
  50                 SWI     XOS_ReadArgs            ;Try to interpret the args
  51                 BVS     %90main                 ;If it failed, return
  52
  53                 ; --- Handle the arguments ---
  54
  55                 LDMIA   R12,{R0-R4}             ;Load values from block
  56
  57                 CMP     R0,#0                   ;Does he want some help?
  58                 BNE     hour__help              ;Yes -- display help then
  59
  60                 ; --- Make sure at most one is set ---
  61
  62                 MOV     R14,#0                  ;Clear argument count
  63                 MOV     R0,#1                   ;Default is to turn on
  64
  65 count           SETA    1
  66                 WHILE   count<5
  67 R$count         RN      $count
  68                 CMP     R$count,#0              ;Is the argument on?
  69                 ADDNE   R14,R14,#1              ;Yes -- bump the counter
  70                 MOVNE   R0,#count-1             ;And remember the argument
  71 count           SETA    count+1
  72                 WEND
  73
  74                 CMP     R14,#2                  ;Is the count valid?
  75                 ADRCS   R0,hour__badArgs        ;No -- point to error
  76                 BCS     %90main                 ;And return to caller
  77
  78                 ; --- Now do the necessaries ---
  79                 ;
  80                 ; The following should be two words long each -- this enables
  81                 ; most operations to be done inline with just a SWI and a
  82                 ; return.
  83
  84                 MOV     R14,PC                  ;Set up return address
  85                 ADD     PC,PC,R0,LSL #3         ;Do what we must do
  86                 LDMFD   R13!,{PC}               ;Return to caller
  87
  88                 ; --- Disable the hourglass ---
  89
  90                 SWI     XHourglass_Off
  91                 MOV     PC,R14
  92
  93                 ; --- Enable the hourglass ---
  94
  95                 SWI     XHourglass_On
  96                 MOV     PC,R14
  97
  98                 ; --- Trash hourglass totally ---
  99
 100                 SWI     XHourglass_Smash
 101                 MOV     PC,R14
 102
 103                 ; --- Turn on the percentage indicator ---
 104                 ;
 105                 ; To save space, this should be the last option.
 106
 107                 LDRB    R0,[R4],#1              ;Load the expression type
 108                 CMP     R0,#0                   ;Is it numeric?
 109                 ADRNE   R0,hour__badType        ;No -- must be a bad type
 110                 ORRNES  PC,R14,#V_flag          ;So return the error
 111                 AND     R2,R4,#3                ;Get non-wordalignedness
 112                 BIC     R4,R4,#3                ;Word align the address
 113                 LDMIA   R4,{R0,R1}              ;Load two overlapping words
 114                 MOV     R2,R2,LSL #3            ;Convert bytes to bits
 115                 RSB     R3,R2,#32               ;And get reverse shift size
 116                 MOV     R0,R0,LSR R2            ;Get the bottom end right
 117                 ORR     R0,R0,R1,LSL R3         ;And move in the top end
 118                 SWI     XHourglass_Percentage   ;Set the percentage as reqd
 119                 MOV     PC,R14                  ;And return to caller
 120
 121 90main          LDMFD   R13!,{R14}              ;Load the return address
 122                 ORRS    PC,R14,#V_flag          ;And return an error
 123
 124 hour__cmdDef    DCB     "help/S,"               ;Offset 0  (R0)
 125                 DCB     "off/S,"                ;Offset 8  (R1)
 126                 DCB     "on/S,"                 ;Offset 4  (R2)
 127                 DCB     "smash/S,"              ;Offset 12 (R3)
 128                 DCB     "percent/K/E,"          ;Offset 16 (R4)
 129                 DCB     0
 130
 131 hour__badArgs   DCD     1
 132                 DCB     "Syntax: hour [<command>]",0
 133
 134 hour__badType   DCD     1
 135                 DCB     "Percentage must be a number",0
 136
 137 hour__help      ADR     R0,hour__helpText       ;Point to the help text
 138                 MOV     R1,#0                   ;No dictionary please
 139                 LDR     R2,=version             ;Find the version string
 140                 ADR     R14,main                ;Find my base address
 141                 ADD     R2,R14,R2               ;Find the actual message
 142                 SWI     XOS_PrettyPrint         ;Print the message
 143                 LDMFD   R13!,{PC}^              ;And return to caller
 144
 145                 LTORG
 146
 147 hour__helpText  DCB     "hour ",27,0,13
 148                 DCB     13
 149                 DCB     "Syntax: hour [<command>]",13
 150                 DCB     13
 151                 DCB     "Performs an Hourglass operation as specified by "
 152                 DCB     "<command>.  If no command is specified, the "
 153                 DCB     "Hourglass is turned on.",13
 154                 DCB     13
 155                 DCB     "Commands allowed are:",13
 156                 DCB     13
 157                 DCB     "-help",9,9,"Displays this help text",13
 158                 DCB     "-on",9,9,"Turns the Hourglass on",13
 159                 DCB     "-off",9,9,"Turns the Hourglass off",13
 160                 DCB     "-smash",9,9,"Forces the Hourglass off",13
 161                 DCB     "-percent",9,"Displays the given percentage",13
 162                 DCB     0
 163
 164 ;----- That's all, folks ----------------------------------------------------
 165
 166                 END