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/*
 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#include <X11/Xlib.h>

/* CUSTOMIZE */

#define FONT			"-*-terminus-medium-*-*-*-13-*-*-*-*-*-iso10646-*"
#define BGCOLOR			"#0a2c2d"
#define FGCOLOR			"#ddeeee"
#define BORDERCOLOR		"#176164"
#define MODKEY			Mod1Mask /* Mod4Mask */
/*
#define BGCOLOR			"#666699"
#define FGCOLOR			"#eeeeee"
#define BORDERCOLOR		"#9999CC"
*/
#define MASTERW			52 /* percent */
#define WM_PROTOCOL_DELWIN	1

/* tags */
enum { Tfnord, Tdev, Tnet, Twork, Tmisc, TLast };

/* END CUSTOMIZE */

typedef union Arg Arg;
typedef struct Client Client;
typedef enum Corner Corner;
typedef struct DC DC;
typedef struct Fnt Fnt;

union Arg {
	const char **argv;
	int i;
};

/* atoms */
enum { NetSupported, NetWMName, NetLast };
enum { WMProtocols, WMDelete, WMLast };

/* cursor */
enum { CurNormal, CurResize, CurMove, CurLast };

enum Corner { TopLeft, TopRight, BotLeft, BotRight };

struct Fnt {
	int ascent;
	int descent;
	int height;
	XFontSet set;
	XFontStruct *xfont;
};

struct DC { /* draw context */
	int x, y, w, h;
	unsigned long bg;
	unsigned long fg;
	unsigned long border;
	Drawable drawable;
	Fnt font;
	GC gc;
};

struct Client {
	char name[256];
	char *tags[TLast];
	int proto;
	int x, y, w, h;
	int tx, ty, tw, th; /* title */
	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
	int grav;
	unsigned int border;
	long flags; 
	Bool isfloat;
	Bool ismax;
	Client *next;
	Client *prev;
	Window win;
	Window title;
};

extern char *tags[TLast], stext[1024];
extern int tsel, screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
extern void (*handler[LASTEvent])(XEvent *);
extern void (*arrange)(Arg *);
extern Atom wmatom[WMLast], netatom[NetLast];
extern Bool running, issel;
extern Client *clients, *sel;
extern Cursor cursor[CurLast];
extern DC dc;
extern Display *dpy;
extern Window root, barwin;

/* client.c */
extern void ban(Client *c);
extern void focus(Client *c);
extern void focusnext(Arg *arg);
extern void focusprev(Arg *arg);
extern Client *getclient(Window w);
extern Client *getctitle(Window w);
extern void gravitate(Client *c, Bool invert);
extern void higher(Client *c);
extern void killclient(Arg *arg);
extern void lower(Client *c);
extern void manage(Window w, XWindowAttributes *wa);
extern void resize(Client *c, Bool sizehints, Corner sticky);
extern void setsize(Client *c);
extern void settitle(Client *c);
extern void togglemax(Arg *arg);
extern void unmanage(Client *c);
extern void zoom(Arg *arg);

/* draw.c */
extern void drawall();
extern void drawstatus();
extern void drawtitle(Client *c);
extern unsigned long getcolor(const char *colstr);
extern void setfont(const char *fontstr);
extern unsigned int textw(char *text);

/* event.c */
extern void grabkeys();

/* main.c */
extern int getproto(Window w);
extern void quit(Arg *arg);
extern void sendevent(Window w, Atom a, long value);
extern int xerror(Display *dsply, XErrorEvent *ee);

/* tag.c */
extern void appendtag(Arg *arg);
extern void dofloat(Arg *arg);
extern void dotile(Arg *arg);
extern Client *getnext(Client *c, unsigned int t);
extern Client *getprev(Client *c);
extern void replacetag(Arg *arg);
extern void settags(Client *c);
extern void togglemode(Arg *arg);
extern void view(Arg *arg);

/* util.c */
extern void *emallocz(unsigned int size);
extern void eprint(const char *errstr, ...);
extern void spawn(Arg *arg);
='oid'>4224ec81 ^
ee9a9237 ^
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# Checking null-terminated ascii strings.
#
# By default we create strings with a 4-byte length prefix rather than a null suffix.
# However we still need null-prefixed strings when interacting with the Linux
# kernel in a few places. This layer implements a function for comparing
# a null-terminated 'kernel string' with a length-prefixed 'SubX string'.
#
# To run (from the subx directory):
#   $ ./subx translate 05[0-2]*.subx -o /tmp/tmp52
#   $ ./subx run /tmp/tmp52  # runs a series of tests
#   ......  # all tests pass
#
# (We can't yet run the tests when given a "test" commandline argument,
# because checking for it would require the function being tested! Breakage
# would cause tests to not run, rather than to fail as we'd like.)

== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

Entry:  # run all tests
    e8/call  run-tests/disp32  # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.
    # syscall(exit, Num-test-failures)
    8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/ebx   Num-test-failures/disp32          # copy *Num-test-failures to ebx
    b8/copy-to-eax  1/imm32/exit
    cd/syscall  0x80/imm8

# compare a null-terminated ascii string with a more idiomatic length-prefixed byte array
# reason for the name: the only place we should have null-terminated ascii strings is from commandline args
kernel-string-equal?:  # s : null-terminated ascii string, benchmark : length-prefixed ascii string -> eax : boolean
    # pseudocode:
    #   n = benchmark->length
    #   s1 = s
    #   s2 = benchmark->data
    #   i = 0
    #   while (i < n)
    #     c1 = *s1
    #     c2 = *s2
    #     if (c1 == 0) return false
    #     if (c1 != c2) return false
    #     ++s1, ++s2, ++i
    #   return *s1 == 0
    #
    # registers:
    #   i: ecx
    #   n: edx
    #   s1: edi
    #   s2: esi
    #   c1: eax
    #   c2: ebx
    #
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # s1/edi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # n/edx = benchmark->length
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           2/r32/edx   0xc/disp8       .                 # copy *(ebp+12) to edx
    8b/copy                         0/mod/indirect  2/rm32/edx    .           .             .           2/r32/edx   .               .                 # copy *edx to edx
    # s2/esi = benchmark->data
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    81          0/subop/add         3/mod/direct    6/rm32/esi    .           .             .           .           .               4/imm32           # add to esi
    # i/ecx = c1/eax = c2/ebx = 0
    b9/copy-to-ecx  0/imm32/exit
    b8/copy-to-eax  0/imm32
    bb/copy-to-ebx  0/imm32
$kernel-string-equal?:loop:
    # if (i >= n) break
    39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           2/r32/edx   .               .                 # compare ecx with edx
    7d/jump-if-greater-or-equal  $kernel-string-equal?:break/disp8
    # c1 = *s1
    8a/copy-byte                    0/mod/indirect  7/rm32/edi    .           .             .           0/r32/AL    .               .                 # copy byte at *edi to AL
    # c2 = *s2
    8a/copy-byte                    0/mod/indirect  6/rm32/esi    .           .             .           3/r32/BL    .               .                 # copy byte at *esi to BL
    # if (c1 == 0) return false
    3d/compare-eax-and  0/imm32
    74/jump-if-equal  $kernel-string-equal?:false/disp8
    # if (c1 != c2) return false
    39/compare                      3/mod/direct    0/rm32/eax    .           .             .           3/r32/ebx   .               .                 # compare eax and ebx
    75/jump-if-not-equal  $kernel-string-equal?:false/disp8
    # ++i
    41/increment-ecx
    # ++s1
    47/increment-edi
    # ++s2
    46/increment-esi
    eb/jump  $kernel-string-equal?:loop/disp8
$kernel-string-equal?:break:
    # return *s1 == 0
    8a/copy-byte                    0/mod/indirect  7/rm32/edi    .           .             .           0/r32/AL    .               .                 # copy byte at *edi to AL
    3d/compare-eax-and  0/imm32
    75/jump-if-not-equal  $kernel-string-equal?:false/disp8
$kernel-string-equal?:true:
    b8/copy-to-eax  1/imm32
    eb/jump  $kernel-string-equal?:end/disp8
$kernel-string-equal?:false:
    b8/copy-to-eax  0/imm32
$kernel-string-equal?:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# - tests

test-compare-null-kernel-string-with-empty-array:
    # eax = kernel-string-equal?(Null-kernel-string, "")
    # . . push args
    68/push  ""/imm32
    68/push  Null-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-compare-null-kernel-string-with-empty-array"/imm32
    68/push  1/imm32/true
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-compare-null-kernel-string-with-non-empty-array:
    # eax = kernel-string-equal?(Null-kernel-string, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    68/push  Null-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-compare-null-kernel-string-with-non-empty-array"/imm32
    68/push  0/imm32/false
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-compare-kernel-string-with-equal-array:
    # eax = kernel-string-equal?(_test-Abc-kernel-string, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    68/push  _test-Abc-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-compare-kernel-string-with-equal-array"/imm32
    68/push  1/imm32/true
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-compare-kernel-string-with-inequal-array:
    # eax = kernel-string-equal?(_test-Abc-kernel-string, "Adc")
    # . . push args
    68/push  "Adc"/imm32
    68/push  _test-Abc-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-compare-kernel-string-with-equal-array"/imm32
    68/push  0/imm32/false
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-compare-kernel-string-with-empty-array:
    # eax = kernel-string-equal?(_test-Abc-kernel-string, "")
    # . . push args
    68/push  ""/imm32
    68/push  _test-Abc-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-compare-kernel-string-with-equal-array"/imm32
    68/push  0/imm32/false
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-compare-kernel-string-with-shorter-array:
    # eax = kernel-string-equal?(_test-Abc-kernel-string, "Ab")
    # . . push args
    68/push  "Ab"/imm32
    68/push  _test-Abc-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-compare-kernel-string-with-shorter-array"/imm32
    68/push  0/imm32/false
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

test-compare-kernel-string-with-longer-array:
    # eax = kernel-string-equal?(_test-Abc-kernel-string, "Abcd")
    # . . push args
    68/push  "Abcd"/imm32
    68/push  _test-Abc-kernel-string/imm32
    # . . call
    e8/call  kernel-string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-compare-kernel-string-with-longer-array"/imm32
    68/push  0/imm32/false
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    c3/return

== data

Null-kernel-string:
    00/null

_test-Abc-kernel-string:
    41/A 62/b 63/c 00/null

# . . vim:nowrap:textwidth=0