diff options
Diffstat (limited to 'programs/utils.s')
| -rw-r--r-- | programs/utils.s | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/programs/utils.s b/programs/utils.s index 6032a47..d8d4aa2 100644 --- a/programs/utils.s +++ b/programs/utils.s @@ -5,6 +5,16 @@ hex_char: .byte "0123456789ABCDEF" +; Compare, and return table for pre-tokens. +ptok_tab: + .byte ".@:=+-><(),xy\"\'#;$%" +; Compare, and return table for isdelm. +dtab: + .byte "\n,\"\' " +; Compare, and return table for isdelm2. +dtab2: + .byte "),.+<>-=;\n" + .org utils print_hi: @@ -134,3 +144,250 @@ charcpy: sta strbuf, x ; Save it in the string buffer. inc idx3 ; Increment the string index. rts ; End of charcpy. + + +strlen: + ldb #1 ; Set the second pointer + jsr set_ptr ; to the passed pointer. + deb ; Reset B. + tba ; Reset A. + tax ; Reset X. + phy #2 ; Preserve Y. + txy ; Reset Y. +@loop: + lda (ptr2), y ; Are we at the end of the string? + beq @end ; Yes, so we're done. + iny ; No, so increment the index. + jmp @loop ; Keep looping. +@end: + tyx ; Return the length in X. + ply #2 ; Get the preserved value back. + rts ; End of strlen. + + +strcmp: + ldb #1 ; Set the second pointer + jsr set_ptr ; to the passed pointer. + deb ; Reset B. + tba ; Reset A. + phy #2 ; Preserve Y. + tay ; Reset Y. +@loop: + ldb #0 ; Set the islong flag to false. + lda (ptr), y ; Are we at the end of the first string? + beq cmpr ; Yes, so check if we're too short, or too long. + ldb #1 ; No, so set the islong flag to true. + cmp (ptr2), y ; Is the character of both strings, the same? + bne cmpr ; No, so check if we're too short, or too long. + iny ; Yes, so increment the index. + jmp @loop ; Keep looping. + +strcasecmp: + ldb #1 ; Set the second pointer + jsr set_ptr ; to the passed pointer. + deb ; Reset B. + tba ; Reset A. + phy #2 ; Preserve Y. + tay ; Reset Y. +@loop: + ldb #0 ; Set the islong flag to false. + lda (ptr), y ; Are we at the end of the first string? + beq cmpr ; Yes, so check if we're too short, or too long. + ldb #1 ; No, so set the islong flag to true. + jsr tolower ; Convert the character of string 1 to lowercase. + phb #1 ; Preserve the islong flag. + pha #1 ; Preserve the converted character. + lda (ptr2), y ; Get the character of the second string. + jsr tolower ; Convert the character of string 2 to lowercase. + tab ; Place it in B. + pla #1 ; Get the character of string 1 back. + cab ; Is the character of both strings, the same? + plb #1 ; Get the islong flag back. + bne cmpr ; No, so check if we're too short, or too long. + iny ; Yes, so increment the index. + jmp @loop ; Keep looping. + +cmpr: + lda (ptr2), y ; Are we at the end of the second string? + beq @islong ; Yes, so check the islong flag. +@isshort: + lda (ptr), y ; No, but are we at the end of the first string? + beq @short ; Yes, so return -1. +@islong: + cpb #1 ; Is the islong flag true? + bne @equ ; No, so return 0. +@long: + lda #1 ; Yes, so return 1. + jmp @end ; We are done. +@equ: + lda #0 ; Return 0. + jmp @end ; We are done. +@short: + lda #$FF ; Return -1. +@end: + ply #2 ; Get the preserved value back. + rts ; End of strcmp. + + +isdigit: + sec ; Prepare for a non carrying subtraction. + sbc #'0' ; Subtract $30 from the passed character. + and #$FF ; Make sure that we have only one byte. + cmp #10 ; Is the subtracted value, less than 10? + bcs @false ; No, so return false. +@true: + lda #1 ; Yes, so return true. + jmp @end ; We are done. +@false: + lda #0 ; Return false. +@end: + rts ; End of isdigit. + +isxdigit: + pha #1 ; Preserve the character. + jsr isdigit ; Is this character, a decimal digit? + pla #1 ; Get the character back. + bne @true ; Yes, so return true. +@alpha: + sec ; No, so prepare for a non carrying subtract. + ora #$20 ; Convert it to lowercase. + sbc #'a' ; Subtract $61 from the character. + and #$FF ; Make sure that we have only one byte. + cmp #6 ; Is the subtracted value, less than 6? + bcs @false ; No, so return false. +@true: + lda #1 ; Yes, so return true. + jmp @end ; We are done. +@false: + lda #0 ; Return false. +@end: + rts ; End of isxdigit. + + +isupper: + sec ; Prepare for a non carrying subtraction. + sbc #'A' ; Subtract $41 from the passed character. + jmp isletter ; Check if it's less than 26. +islower: + sec ; Prepare for a non carrying subtraction. + sbc #'a' ; Subtract $61 from the passed character. +isletter: + and #$FF ; Make sure that we have only one byte. + cmp #26 ; Is the subtracted value, less than 26? + bcs @false ; No, so return false. +@true: + lda #1 ; Yes, so return true. + jmp @end ; We are done. +@false: + lda #0 ; Return false. +@end: + rts ; End of isletter. + + +tolower: + pha #1 ; Preserve the character. + jsr isupper ; Is this character, an uppercase character? + pla #1 ; Get the character back. + beq @end ; No, so we're done. +@lower: + ora #$20 ; Yes, so convert it to lowercase. +@end: + rts ; End of tolower. + + +toupper: + pha #1 ; Preserve the character. + jsr islower ; Is this character, a lowercase character? + pla #1 ; Get the character back. + beq @end ; No, so we're done. +@upper: + and #$5F ; Yes, so convert it to uppercase. +@end: + rts ; End of toupper. + + +isdelm2: + ldx #0 ; Reset X. +@loop: + ldb dtab2, x ; Get the compare value. + beq @other ; We hit the end of the table, so check for the others. + cab ; Are they the same? + beq @r1 ; Yes, so return 1. + inx ; No, so increment the table index. + jmp @loop ; Keep looping. +@other: + ldx #0 ; Reset X. + cmp #0 ; Is this a null terminator? + beq @r1 ; Yes, so return 1. + cmp #'\t' ; No, but is it a tab? + beq @r2 ; Yes, so return 2. + cmp #' ' ; No, but is it a space? + beq @r2 ; Yes, so also return 2. +@r0: + lda #0 ; Return 0. + rts ; End of isdelm2. +@r1: + ldx #0 ; Reset X. + lda #1 ; Return 1. + rts ; End of isdelm2. +@r2: + lda #2 ; Return 2. + rts ; End of isdelm2. + + +isdelm: + ldx #0 ; Reset X. +@loop: + ldb dtab, x ; Get the compare value. + beq @other ; We hit the end of the table, so check for the others. + cab ; Are they the same? + beq @rshft ; Yes, so return 1 << index. + inx ; No, so increment the table index. + jmp @loop ; Keep looping. +@other: + ldx #0 ; Reset X. + cmp #0 ; Is this a null terminator? + beq @rshft ; Yes, so return 1. + ldx #4 ; No, so set the shift amount to 4. + cmp #'\t' ; Is this a tab? + beq @rshft ; Yes, so return 16. + ldx #0 ; No, so reset X. +@r0: + lda #0 ; Return 0. + rts ; End of isdelm. +@rshft: + stx a ; Save the shift value. + ldx #0 ; Reset X. + lda #1 ; Set up the bitshift. + lsl a ; Return 1 << X. + rts ; End of isdelm. + + +get_ptok: + ldx #0 ; Reset X. + jsr tolower ; Conver the character to lowercase. +@loop: + ldb ptok_tab, x ; Get the compare value. + beq @other ; We hit the end of the table, so check for the others. + cab ; Are they the same? + beq @rtab ; Yes, so return X. + inx ; No, so increment the table index. + jmp @loop ; Keep looping. +@rtab: + txa ; Return X. + rts ; End of get_ptok. +@other: + tab ; Preserve the character. + jsr isdigit ; Is this character a digit? + bne @rnum ; Yes, so return PTOK_NUM. + tba ; No, so get the character back. + jsr islower ; Is it an alphabetical character? + bne @ralph ; Yes, so return PTOK_ALPH. + lda #PTOK_OTHR ; No, so return PTOK_OTHR. + rts ; End of get_ptok. +@rnum: + lda #PTOK_NUM ; Return PTOK_NUM. + rts ; End of get_ptok. +@ralph: + lda #PTOK_ALPH ; Return PTOK_ALPH. + rts ; End of get_ptok. |