/* ARM assembly AARCH64 Raspberry PI 3B */
/*  program concAreaString.s   */

/*******************************************/
/* Constantes file                         */
/*******************************************/
/* for this file see task include a file in language AArch64 assembly*/
.include "../includeConstantesARM64.inc"
.equ NBMAXITEMS,  20   //
/*******************************************/
/* Initialized data                        */
/*******************************************/
.data
szMessLenArea: .asciz "The length of area 3  is : @ \n"
szCarriageReturn:  .asciz "\n"

/* areas strings  */
szString1:  .asciz "Apples"
szString2:  .asciz "Oranges"
szString3:  .asciz "Pommes"
szString4:  .asciz "Raisins"
szString5:  .asciz "Abricots"

/* pointer items area 1*/
tablesPoi1:
pt1_1:           .quad szString1
pt1_2:           .quad szString2
ptVoid_1:        .quad 0

/* pointer items area 2*/
tablesPoi2:
pt2_1:           .quad szString3
pt2_2:           .quad szString4
pt2_3:           .quad szString5
ptVoid_2:        .quad 0
/*******************************************/
/* UnInitialized data                      */
/*******************************************/
.bss
tablesPoi3:    .skip   8 * NBMAXITEMS
sZoneConv:     .skip 30
/*******************************************/
/*  code section                           */
/*******************************************/
.text
.global main
main:                       // entry of program

                            // copy area 1 ->  area 3
    ldr x1,qAdrtablesPoi1   // begin pointer area 1
    ldr x3,qAdrtablesPoi3   // begin pointer area 3
    mov x0,0                // counter
1:
    ldr x2,[x1,x0,lsl 3]    // read string pointer address item x0 (8 bytes by pointer)
    cbz x2,2f               // is null ?
    str x2,[x3,x0,lsl 3]    // no store pointer in area 3
    add x0,x0,1             // increment counter
    b 1b                    // and loop
2:                          // copy area 2 ->  area 3
    ldr x1,qAdrtablesPoi2   // begin pointer area 2
    ldr x3,qAdrtablesPoi3   // begin pointer area 3
    mov x4,#0               // counter area 2
3:                          // x0 contains the first void item in area 3
    ldr x2,[x1,x4,lsl #3]   // read string pointer address item x0 (8 bytes by pointer)
    cbz x2,4f               // is null ?
    str x2,[x3,x0,lsl #3]   // no store pointer in area 3
    add x0,x0,1             // increment counter
    add x4,x4,1             // increment counter
    b 3b                    // and loop
4:
                            // count items number in area 3
    ldr x1,qAdrtablesPoi3   // begin pointer table
    mov x0,#0               // counter
5:                          // begin loop
    ldr x2,[x1,x0,lsl #3]   // read string pointer address item x0 (8 bytes by pointer)
    cmp x2,#0               // is null ?
    cinc x0,x0,ne           // no increment counter
    bne 5b                  // and loop

    ldr x1,qAdrsZoneConv    // conversion decimal
    bl conversion10S
    ldr x0,qAdrszMessLenArea
    ldr x1,qAdrsZoneConv
    bl strInsertAtCharInc   // insert result at @ character
    bl affichageMess

100:                        // standard end of the program
    mov x0,0                // return code
    mov x8,EXIT             // request to exit program
    svc 0                   // perform the system call
qAdrtablesPoi1:        .quad tablesPoi1
qAdrtablesPoi2:        .quad tablesPoi2
qAdrtablesPoi3:        .quad tablesPoi3
qAdrszMessLenArea:     .quad szMessLenArea
qAdrsZoneConv:         .quad sZoneConv
qAdrszCarriageReturn:  .quad szCarriageReturn
/****************************************************/
/*        File Include fonctions                        */
/********************************************************/
/* for this file see task include a file in language AArch64 assembly */
.include "../includeARM64.inc"