Changeset 580 in xtideuniversalbios for trunk/Assembly_Library/Src/Display/DisplayFormatCompressed.asm
- Timestamp:
- Feb 19, 2015, 1:38:02 PM (9 years ago)
- google:author:
- krille_n_@hotmail.com
- File:
-
- 1 edited
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- Added
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trunk/Assembly_Library/Src/Display/DisplayFormatCompressed.asm
r567 r580 89 89 xor bx, bx 90 90 xchg si, ax 91 jmp shortDisplayPrint_NullTerminatedStringFromBXSI91 jmp SHORT DisplayPrint_NullTerminatedStringFromBXSI 92 92 93 93 DisplayFormatCompressed_Format_x: 94 94 DisplayFormatCompressed_Format_5_x: 95 mov si, 16 ; hex output, change base to 1696 mov bx, (04<<8) + 'h' ; 4 bytes, with postfix character 'h' to emit95 mov si, 16 ; hex output, change base to 16 96 mov bx, (04<<8) + 'h' ; 4 bytes, with postfix character 'h' to emit 97 97 ; (note that the count includes the 'h') 98 jmp DisplayFormatCompressed_Format_u 99 100 DisplayFormatCompressed_Format_2_I: 101 mov si,g_szDashForZero ; preload dash string in case we jump 102 test ax,ax ; if parameter equals zero, emit dash string instead 103 jz DisplayFormat_ParseCharacters 104 ; fall through 98 SKIP2B f ; Fall through to DisplayFormatCompressed_Format_u 105 99 106 100 DisplayFormatCompressed_Format_2_u: 107 mov bh, 2 ; only two characters (instead of the default 5)101 mov bh, 2 ; only two characters (instead of the default 5) 108 102 ; fall through 109 103 … … 111 105 DisplayFormatCompressed_Format_5_u: 112 106 push bx ; push postfix character - either a zero (default) or a 'h' 113 mov bl, bh ; preserve character count for .PrintLoop107 mov bl, bh ; preserve character count for .PrintLoop 114 108 115 109 .DivLoop: … … 119 113 120 114 dec bh 121 jnz .DivLoop115 jnz SHORT .DivLoop 122 116 123 117 .PrintLoop: … … 125 119 126 120 dec bl ; on second to last iteration, emit digit whether it is zero or not 127 jz .PrintDigit 128 129 js short DisplayPrint_CharacterFromAL ; on last iteration, emit postfix character 121 jz SHORT .PrintDigit 122 js SHORT DisplayPrint_CharacterFromAL ; on last iteration, emit postfix character 130 123 ; if it is zero, DisplayPrint_CharacterFromAL will not emit 131 124 132 125 or bh, al ; skip leading zeros, bh keeps track if we have emitted anything non-zero 133 jnz .PrintDigit; note that bh starts at zero, from the loop above134 135 test ch, 2 ; are we padding with leading spaces?136 jnz .PrintLoop; test the even/odd of the format byte in the string126 jnz SHORT .PrintDigit ; note that bh starts at zero, from the loop above 127 128 test ch, 2 ; are we padding with leading spaces? 129 jnz SHORT .PrintLoop ; test the even/odd of the format byte in the string 137 130 138 131 mov al, 89h ; emit space … … 144 137 145 138 call DisplayPrint_CharacterFromAL 146 147 jmp .PrintLoop 148 139 jmp SHORT .PrintLoop 140 141 DisplayFormatCompressed_Format_2_I: 142 test ax, ax 143 jnz SHORT DisplayFormatCompressed_Format_2_u 144 mov si, g_szDashForZero ; if parameter equals zero, emit dash string instead 145 SKIP2B bx ; Fall through to DisplayFormat_ParseCharacters 149 146 150 147 ;-------------------------------------------------------------------- … … 161 158 ; AX, BX, CX, DX, BP 162 159 ;-------------------------------------------------------------------- 163 164 160 DisplayFormatCompressed_BaseFormatOffset: 165 166 161 DisplayFormat_ParseCharacters_FromAX: 167 mov si, ax162 mov si, ax 168 163 ; fall through to DisplayFormat_ParseCharacters 169 164 … … 174 169 ; and must be handled differently. 175 170 ; 176 cmp si, byte 07fh ; well within the boundaries of ROMVARS_size177 mov bx, cs ; preload bx with cs in case we take the following jump178 jb shortDisplayPrint_NullTerminatedStringFromBXSI171 cmp si, BYTE 7Fh ; well within the boundaries of ROMVARS_size 172 mov bx, cs ; preload bx with cs in case we take the following jump 173 jb SHORT DisplayPrint_NullTerminatedStringFromBXSI 179 174 180 175 .decode: 181 176 cs lodsb ; load next byte of the string 182 183 mov ch,al ; save a copy for later processing of high order bits 184 185 test al,0c0h ; check for translation/format character 186 jz DisplayFormatCompressed_TranslatesAndFormats 187 188 and al,03fh ; "Normal" character, mask off high order bits 189 add al,StringsCompressed_NormalBase ; and add character offset (usually around 0x40) 177 mov ch, al ; save a copy for later processing of high order bits 178 test al, 0C0h ; check for translation/format character 179 jz SHORT DisplayFormatCompressed_TranslatesAndFormats 180 181 and al, 3Fh ; "Normal" character, mask off high order bits 182 add al, StringsCompressed_NormalBase ; and add character offset (usually around 0x40) 190 183 191 184 .output: … … 193 186 194 187 .process_after_output: 195 eSHL_IM ch, 1 ; check high order bits for end of string or space196 jns shortDisplayFormatCompressed_ret197 jnc .decode198 mov al, ' '188 eSHL_IM ch, 1 ; check high order bits for end of string or space 189 jns SHORT DisplayFormatCompressed_ret 190 jnc SHORT .decode 191 mov al, ' ' 199 192 call DisplayPrint_CharacterFromAL 200 jmp .decode193 jmp SHORT .decode 201 194 202 195 … … 207 200 ; DisplayFormatCompressed_BaseFormatOffset and jump targets (must fit in 256 bytes) 208 201 ; 209 eSHL_IM ch,1 ; setup ch for later testing of null in .process_after_output 210 and ax,0001fh ; also clears AH for addition with BX and DX below 211 212 mov bx,StringsCompressed_TranslatesAndFormats ; calculate offset of translation/formats offset byte 213 add bx,ax 214 215 cmp al,StringsCompressed_FormatsBegin ; determine if this is a translation or a format 216 217 mov al,[cs:bx] ; fetch translation/formats byte 218 219 jb DisplayFormat_ParseCharacters.output ; check if this a translation or a format 202 eSHL_IM ch, 1 ; setup ch for later testing of null in .process_after_output 203 and ax, 001Fh ; also clears AH for addition with BX and DX below 204 205 mov bx, StringsCompressed_TranslatesAndFormats ; calculate offset of translation/formats offset byte 206 add bx, ax 207 208 cmp al, StringsCompressed_FormatsBegin ; determine if this is a translation or a format 209 mov al, [cs:bx] ; fetch translation/formats byte 210 jb SHORT DisplayFormat_ParseCharacters.output ; check if this a translation or a format 220 211 ; if it is translation, output and postprocess for eos 221 212 ; note that the flags for this conditional jump were 222 213 ; set with the cmp al,StringsCompressed_FormatsBegin 223 214 224 mov dx, DisplayFormatCompressed_BaseFormatOffset; calculate address to jump to for format handler225 sub dx, ax226 227 mov ax, [bp]; preload ax with parameter215 mov dx, DisplayFormatCompressed_BaseFormatOffset ; calculate address to jump to for format handler 216 sub dx, ax 217 218 mov ax, [bp] ; preload ax with parameter 228 219 dec bp ; if no parameter is needed (format 'nl' for example), 229 220 dec bp ; the format handler can reincrement bp 230 221 231 mov bx, 0500h ; preload bh with 5 decimal places for numeric output222 mov bx, 0500h ; preload bh with 5 decimal places for numeric output 232 223 ; bl is zero, indicating not to output a 'h' (default base 10) 233 224 … … 235 226 push cx 236 227 237 mov si,10 ; preload si with 10 for numeric output (default base 10) 238 228 mov si, 10 ; preload si with 10 for numeric output (default base 10) 239 229 call dx ; call the format routine 240 230 … … 242 232 pop si 243 233 244 jmp DisplayFormat_ParseCharacters.process_after_output ; continue postprocessing, check for end of string 245 234 jmp SHORT DisplayFormat_ParseCharacters.process_after_output ; continue postprocessing, check for end of string
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