Store ASCII text in a memory area in assembly

Hi,
This is regarding ARM7 Big Endian Assembly language program
There is a STRING2 is defined like STRING2 SPACE  0xFF 
A register r6 = 0x00000074
with ASCII values at that address memory location = 123 the...
How to store this 123 the.. text in STRING2

Just if it makes more sense i am writing the code here :

      AREA remove, CODE, READONLY
      ENTRY

eos      EQU    0x00                        ;Define null constant for comparison use
t      EQU    0x74                        ;Define 't' for comparison use
spce    EQU    0x20                        ;Define ' ' (space) for comparison use
byte   EQU    8                           ;Define # of bits in 1 byte

      ADR      r1, STRING1                     ;Let r1 be a pointer to string 1
      ADR      r2, STRING2                     ;Let r2 pointer to string 2
      LDR      r3, =0x74686520                  ;Store "the " for comparison use 
      
                                       ;CASE 1 - beginning of sentence
      LDRB    r5, [r1]                     ;Load the first character from string 1
      CMP      r5, #t                        ;Is the character 't'?
      BEQ      check                        ;If yes, branch to check if "he " or "he\0" follows 

                                       ;LOOP
loop   LDRB    r5, [r1], #1                  ;Load a character from string 1, increment pointer after
      STRB    r5, [r2], #1                  ;Store the character, increment pointer after
                                       
                                       ;CASE 2 - end of sentence
      CMP      r5, #eos                     ;Check if it's the eos character 
      BEQ      inf                           ;If yes, skip to the end of the program
      CMP      r5, #spce                     ;If no, check if it's a space. If so, "the " or "the\0" may follow            
      BNE      loop                        ;UNTIL character is a space   
                              
                                       ;Either we are at the start of the sentence or the character is a space
check   MOV      r6, r1                        ;Save the current position of the pointer for string 1, in case we need to go back
      MOV      r4, #0                        ;Reset r4, as we will make it point at a substring of the next 4 characters in string 1

build   LDRB    r5, [r1], #1                  ;Build the substring by adding one character at a time
      CMP      r5, #eos                     ;Check if the character is eos character
      LDREQ    r3, =0x74686500                  ;If eos and the substring equals "the\0", it will be removed from the string
      ADD      r4, r5                        ;Append the character to the substring
      CMP      r4, #0x10000000                  ;Check if the substring contains less than 4 characters
      LSLLT    r4, #byte                     ;If yes then shift the substring 1 byte left
      BLT      build                        ;And continue building the substring (else, the substring is built)
                              
      CMP      r4, r3                        ;Check if substring is "the " or "the\0" (if equal, then the substring must be removed)
      SUBEQ    r1, #1                        ;If equal, decrement the pointer to string 1 in order to preserve space or null character 
      MOVNE    r1, r6                        ;Else, the substring should not be removed so return the pointer to string 1 back to initial position

      B       loop                        ;Repeat processing until string 1's eos character is reached
      
inf      B      inf                           ;End program with an infinite loop to prevent error

STRING1 DCB    "the the the 123 the"             ;String 1 
EoS      DCB    0x00                         ;End of string 1
STRING2 SPACE    0xFF                        ;The string with "the" removed
      
      ALIGN
      END

Select allOpen in new window