[2] | 1 | ; File name : string.asm |
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| 2 | ; Project name : String library |
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| 3 | ; Created date : 7.10.2009 |
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[78] | 4 | ; Last update : 4.1.2011 |
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[75] | 5 | ; Author : Tomi Tilli, |
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[78] | 6 | ; : Krister Nordvall (optimizations) |
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[2] | 7 | ; Description : ASM library to work as Standard C String and Character. |
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| 8 | |
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| 9 | ;--------------- Equates ----------------------------- |
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| 10 | |
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| 11 | ; String library function to include |
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| 12 | %define USE_STR_ISCHAR |
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| 13 | %define USE_STR_ISBASECHAR |
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| 14 | %define USE_STR_BUFFHASCHAR |
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| 15 | ;%define USE_STR_BUFFCMP |
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| 16 | %define USE_STR_TOUINT |
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| 17 | %define USE_STR_LEN |
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| 18 | %define USE_STR_TOKEN |
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| 19 | ;%define USE_STR_WITHIN |
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| 20 | %define USE_STR_TOLOWER |
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| 21 | ;%define USE_STR_TOUPPER |
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| 22 | |
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| 23 | ; Special characters for strings |
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| 24 | STOP EQU 0 ; String ending character |
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| 25 | BELL EQU 7 ; Bell |
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| 26 | BS EQU 8 ; Backspace |
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| 27 | TAB EQU 9 ; Horizontal tab |
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| 28 | LF EQU 10 ; Line feed \ Combine to... |
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| 29 | CR EQU 13 ; Carriage return / ...get a newline |
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| 30 | ESC EQU 27 ; ESC |
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| 31 | |
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| 32 | ; Misc characters |
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| 33 | UARROW EQU 24 ; Up arrow |
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| 34 | DARROW EQU 25 ; Down arrow |
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| 35 | RARROW EQU 26 ; Right arrow |
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| 36 | LARROW EQU 27 ; Left arrow |
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| 37 | |
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| 38 | ; Characters for printing boxes |
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| 39 | B_V EQU 186 ; Bold vertical border (Y-axis) |
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| 40 | B_H EQU 205 ; Bold horizontal border (X-axis) |
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| 41 | B_TL EQU 201 ; Bold top left border |
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| 42 | B_TR EQU 187 ; Bold top right border |
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| 43 | B_LR EQU 188 ; Bold lower right border |
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| 44 | B_LL EQU 200 ; Bold lower left border |
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| 45 | |
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| 46 | T_V EQU 179 ; Thin vertical border (Y-axis) |
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| 47 | T_H EQU 196 ; Thin horizontal border (X-axis) |
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| 48 | T_TL EQU 218 ; Thin top left border |
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| 49 | T_TR EQU 191 ; Thin top right border |
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| 50 | T_LR EQU 217 ; Thin lower right border |
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| 51 | T_LL EQU 192 ; Thin lower left border |
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| 52 | |
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| 53 | BVL_THR EQU 199 ; Bold vert on left, Thin horiz on right (||-) |
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| 54 | THL_BVR EQU 182 ; Thin horiz on left, Bold vert on right (-||) |
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| 55 | TVL_BHR EQU 198 ; Thin vert on left, Bold horiz on right (|=) |
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| 56 | BHL_TVR EQU 181 ; Bold horiz on left, Thin vert on right (=|) |
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| 57 | |
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| 58 | ; Blocks |
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| 59 | MIN_BLCK EQU 176 ; Few character pixels set |
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| 60 | FULL_BLCK EQU 219 ; All character pixels set |
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| 61 | |
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| 62 | |
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| 63 | ;-------------- Private global variables ------------- |
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| 64 | ; Section containing initialized data |
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| 65 | ;SECTION .data |
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| 66 | |
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| 67 | |
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| 68 | ;-------------- Public functions --------------------- |
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| 69 | ; Section containing code |
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| 70 | SECTION .text |
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| 71 | |
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| 72 | ;-------------------------------------------------------------------- |
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| 73 | ; Checks if character is some type of character. |
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| 74 | ; |
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| 75 | ; String_IsAlphaNum (checks if alphanumeric letter, isalnum on C) |
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| 76 | ; String_IsAlpha (checks if alphabetic letter, isalpha on C) |
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| 77 | ; String_IsDigit (checks if decimal digit, isdigit on C) |
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| 78 | ; String_IsLower (checks if lowercase letter, islower on C) |
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| 79 | ; String_IsSpace (checks if any space character, isspace on C) |
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| 80 | ; String_IsUpper (checks if uppercase letter, isupper on C) |
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| 81 | ; String_IsHexDigit (checks if hexadecimal digit, isxdigit on C) |
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| 82 | ; Parameters: |
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| 83 | ; AL: Character to check |
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| 84 | ; Returns: |
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| 85 | ; CF: Set if character is the type to check |
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| 86 | ; Cleared if character is not the type to check |
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| 87 | ; Corrupts registers: |
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| 88 | ; Nothing |
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| 89 | ;-------------------------------------------------------------------- |
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| 90 | %ifdef USE_STR_ISCHAR |
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| 91 | ALIGN JUMP_ALIGN |
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| 92 | String_IsAlphaNum: |
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[75] | 93 | call String_IsAlpha |
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| 94 | jnc SHORT String_IsDigit |
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[2] | 95 | ret |
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| 96 | |
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| 97 | ALIGN JUMP_ALIGN |
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| 98 | String_IsAlpha: |
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[75] | 99 | call String_IsLower |
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| 100 | jnc SHORT String_IsUpper |
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[2] | 101 | ret |
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| 102 | |
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| 103 | ALIGN JUMP_ALIGN |
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| 104 | String_IsDigit: |
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| 105 | cmp al, '0' ; At least first dec digit? |
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| 106 | jb _String_IsRetFalse ; If not, return FALSE |
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| 107 | cmp al, '9'+1 ; At most last dec digit? |
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| 108 | ret |
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| 109 | |
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| 110 | ALIGN JUMP_ALIGN |
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| 111 | String_IsLower: |
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| 112 | cmp al, 'a' ; At least first lower case letter? |
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| 113 | jb _String_IsRetFalse ; If not, return FALSE |
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| 114 | cmp al, 'z'+1 ; At most last lower case letter? |
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| 115 | ret |
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| 116 | |
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| 117 | ALIGN JUMP_ALIGN |
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| 118 | String_IsSpace: |
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| 119 | cmp al, ' '+1 ; Space or non-visible character? |
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| 120 | ret |
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| 121 | |
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| 122 | ALIGN JUMP_ALIGN |
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| 123 | String_IsUpper: |
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| 124 | cmp al, 'A' ; At least first upper case letter? |
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| 125 | jb _String_IsRetFalse ; If not, return FALSE |
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| 126 | cmp al, 'Z'+1 ; At most last upper case letter? |
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| 127 | ret |
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| 128 | |
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| 129 | ALIGN JUMP_ALIGN |
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| 130 | String_IsHexDigit: |
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| 131 | call String_IsAlphaNum ; Is alphabetic letter or digit? |
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[78] | 132 | jnc .ExitStrIsHexDigit ; If it is, check A...F. If not, exit |
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[2] | 133 | push ax ; Store character |
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| 134 | call String_ToLower ; Convert to lower case letter |
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| 135 | cmp al, 'f'+1 ; Last valid hex alphanumeric? |
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| 136 | pop ax ; Restore character |
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[78] | 137 | |
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| 138 | .ExitStrIsHexDigit: |
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[2] | 139 | ret |
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| 140 | |
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| 141 | ALIGN JUMP_ALIGN |
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| 142 | _String_IsRetFalse: |
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| 143 | clc ; Clear CF since false |
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| 144 | ret |
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| 145 | %endif ; USE_STR_ISCHAR |
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| 146 | |
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| 147 | |
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| 148 | ;-------------------------------------------------------------------- |
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| 149 | ; Checks if character belongs to specified numeric base. |
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| 150 | ; |
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| 151 | ; String_IsBaseChar |
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| 152 | ; Parameters: |
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| 153 | ; AL: Character to check |
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| 154 | ; CL: Numeric base (10=dec, 16=hex etc.) |
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| 155 | ; Returns: |
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| 156 | ; AH: Integer value for character |
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| 157 | ; CF: Set if character belongs to base |
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| 158 | ; Set if character does not belong to base |
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| 159 | ; Corrupts registers: |
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| 160 | ; Nothing |
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| 161 | ;-------------------------------------------------------------------- |
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| 162 | %ifdef USE_STR_ISBASECHAR |
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| 163 | ALIGN JUMP_ALIGN |
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| 164 | String_IsBaseChar: |
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| 165 | mov ah, al ; Copy char to AH |
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| 166 | call String_IsDigit ; Is '0'...'9'? |
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[78] | 167 | jnc .CheckForAlpha ; If not, check for alphabetic letter |
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| 168 | sub al, '0' ; Convert char to integer |
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| 169 | jmp .FinalizeAXAndCheckBase |
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| 170 | |
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| 171 | .CheckForAlpha: |
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[2] | 172 | call String_IsAlpha ; Is alphabetic letter? |
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[78] | 173 | jnc .JustRet ; If not, return FALSE |
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[2] | 174 | call String_ToLower ; Convert to lower case |
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[78] | 175 | sub al, 'a'-10 ; From char to integer: a=10, b=11... |
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| 176 | |
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| 177 | .FinalizeAXAndCheckBase: |
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[2] | 178 | xchg al, ah ; Converted char to AH |
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| 179 | cmp ah, cl ; Belongs to base? |
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[78] | 180 | |
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| 181 | .JustRet: ; CF now reflects TRUE/FALSE so just return |
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[2] | 182 | ret |
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| 183 | %endif |
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| 184 | |
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| 185 | |
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| 186 | ;-------------------------------------------------------------------- |
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| 187 | ; Finds first occurrence of character from buffer (memchr on C). |
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| 188 | ; |
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| 189 | ; String_BuffHasChar |
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| 190 | ; Parameters: |
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| 191 | ; AL: Character to check |
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| 192 | ; CX: Buffer length in bytes (1...65535, 0 clears CF) |
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| 193 | ; ES:DI: Pointer to buffer |
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| 194 | ; Returns: |
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| 195 | ; AX: Index of character in buffer (if char found) |
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| 196 | ; ES:BX: Pointer to character location (if char found) |
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| 197 | ; CF: Set if character found |
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| 198 | ; Cleared if character not found |
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| 199 | ; Corrupts registers: |
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| 200 | ; Nothing |
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| 201 | ;-------------------------------------------------------------------- |
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| 202 | %ifdef USE_STR_BUFFHASCHAR |
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| 203 | ALIGN JUMP_ALIGN |
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| 204 | String_BuffHasChar: |
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| 205 | jcxz .Return ; Check length so no need to initialise ZF |
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| 206 | push di ; Store offset to buffer |
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| 207 | times 2 push cx ; Store CX |
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| 208 | cld ; Set SCASB to increment DI |
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| 209 | repne scasb ; Compare bytes to AL until found or CX=0 |
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| 210 | jne .CharNotFound ; Character not found, return FALSE |
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| 211 | |
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| 212 | ; Character found |
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| 213 | pop ax ; Pop buffer length |
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| 214 | sub ax, cx ; Subtract number of chars left |
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| 215 | dec ax ; Number of chars scanned to found index |
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| 216 | lea bx, [di-1] ; Load character offset to BX |
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| 217 | pop cx ; Restore CX |
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| 218 | pop di ; Restore DI |
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| 219 | stc ; Set CF since char found |
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| 220 | ret |
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| 221 | .CharNotFound: |
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| 222 | times 2 pop cx ; Restore CX |
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| 223 | pop di ; Restore DI |
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| 224 | .Return: |
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| 225 | clc ; Clear CF since char not found |
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| 226 | ret |
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| 227 | %endif |
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| 228 | |
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| 229 | |
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| 230 | ;-------------------------------------------------------------------- |
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| 231 | ; Compares two buffers (memcmp on C). |
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| 232 | ; |
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| 233 | ; String_BuffCmp |
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| 234 | ; Parameters: |
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| 235 | ; CX: Buffer length in bytes (1...65535, 0 clears ZF) |
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| 236 | ; DS:SI: Pointer to buffer 1 |
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| 237 | ; ES:DI: Pointer to buffer 2 |
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| 238 | ; Returns: |
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| 239 | ; AX: Index of unequal character (if buffers are not equal) |
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| 240 | ; ZF: Set if buffers are equal |
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| 241 | ; Cleared if buffers are not equal |
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| 242 | ; Corrupts registers: |
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| 243 | ; Nothing |
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| 244 | ;-------------------------------------------------------------------- |
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| 245 | %ifdef USE_STR_BUFFCMP |
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| 246 | ALIGN JUMP_ALIGN |
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| 247 | String_BuffCmp: |
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| 248 | jcxz .ReturnUnequal ; Check length so no need to initialise ZF |
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| 249 | push di ; Store offset to buffer 2 |
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| 250 | push si ; Store offset to buffer 1 |
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| 251 | times 2 push cx ; Store CX |
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| 252 | cld ; Set CMPSB to increment SI and DI |
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| 253 | repe cmpsb ; Compare bytes until not equal or CX=0 |
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| 254 | jne .BuffersUnequal ; Unequal byte found, return FALSE |
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| 255 | times 2 pop cx ; Restore CX |
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| 256 | pop si ; Restore SI |
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| 257 | pop di ; Restore DI |
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| 258 | ret |
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| 259 | .BuffersUnequal: |
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| 260 | pop ax ; Pop buffer length |
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| 261 | sub ax, cx ; Subtrack number of chars left |
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| 262 | dec ax ; Number of chars compared to unequal idx |
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| 263 | xor cx, cx ; Zero CX |
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| 264 | dec cx ; ZF=0 |
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| 265 | pop cx ; Restore CX |
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| 266 | pop si ; Restore SI |
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| 267 | pop di ; Restore DI |
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| 268 | ret |
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| 269 | .ReturnUnequal: |
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| 270 | xor ax, ax ; Zero AX |
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| 271 | dec ax ; AX = FFFFh, ZF=0 |
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| 272 | ret |
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| 273 | %endif |
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| 274 | |
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| 275 | |
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| 276 | ;-------------------------------------------------------------------- |
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| 277 | ; Converts a string buffer to unsigned 32-bit integer. |
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| 278 | ; |
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| 279 | ; String_BuffToUInt |
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| 280 | ; Parameters: |
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| 281 | ; ES:DI: Pointer to string buffer to convert |
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| 282 | ; CX: Base (10=dec, 16=hex etc.) |
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| 283 | ; SI: Buffer length in characters |
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| 284 | ; Returns: |
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| 285 | ; DX:AX: 32-bit unsigned integer |
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| 286 | ; CF: Set if converted successfully |
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| 287 | ; Cleared if error |
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| 288 | ; Corrupts registers: |
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| 289 | ; Nothing |
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| 290 | ;-------------------------------------------------------------------- |
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| 291 | %ifdef USE_STR_TOUINT |
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| 292 | ALIGN JUMP_ALIGN |
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| 293 | String_BuffToUInt: |
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| 294 | ; Copy ES:DI to DS:SI |
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| 295 | push ds ; Store DS |
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| 296 | push si ; Store SI |
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| 297 | push di ; Store DI |
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| 298 | push bx ; Store BX |
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| 299 | xchg si, di ; Offset to SI, lenght to DI |
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| 300 | push es |
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| 301 | pop ds |
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| 302 | |
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| 303 | ; Prepare to read chars |
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| 304 | xor dx, dx ; Zero DX (HIWORD) |
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| 305 | xor bx, bx ; Zero BX (LOWORD) |
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| 306 | ALIGN JUMP_ALIGN |
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| 307 | .CharLoop: |
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| 308 | lodsb ; Load char to AL |
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| 309 | call String_IsBaseChar ; Is valid character? (AH=digit) |
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| 310 | jnc .RetFalse ; If not, return FALSE |
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| 311 | xchg ax, bx ; AX=LOWORD, BX=digit and char |
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| 312 | call Math_MulDWbyW ; DX:AX *= CX |
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| 313 | xchg ax, bx ; AX=digit and char, BX=LOWORD |
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| 314 | mov al, ah ; Copy digit to AL |
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| 315 | xor ah, ah ; Zero AH, AX=digit |
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| 316 | add bx, ax ; Add digit to LOWORD |
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| 317 | adc dx, 0 ; Add carry to HIWORD |
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| 318 | dec di ; Decrement characters left |
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| 319 | jnz .CharLoop ; Loop while characters left |
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| 320 | |
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| 321 | stc ; Set CF since success |
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[78] | 322 | .RetFalse: ; If we jumped to here no CLC is needed to reflect a FALSE condition |
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| 323 | mov ax, bx ; Copy loword to AX (may be incomplete) |
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[2] | 324 | pop bx ; Restore BX |
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| 325 | pop di ; Restore DI |
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| 326 | pop si ; Restore SI |
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| 327 | pop ds ; Restore DS |
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| 328 | ret |
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| 329 | %endif |
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| 330 | |
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| 331 | |
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| 332 | ;-------------------------------------------------------------------- |
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| 333 | ; Returns string lenght. Strings must end to STOP character (strlen on C). |
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| 334 | ; |
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| 335 | ; String_StrLen |
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| 336 | ; Parameters: |
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| 337 | ; ES:DI: Pointer to string |
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| 338 | ; Returns: |
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| 339 | ; AX: String length in characters excluding STOP char |
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| 340 | ; CF: Set if STOP character was found |
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| 341 | ; Cleared if STOP character was not found |
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| 342 | ; Corrupts registers: |
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| 343 | ; Nothing |
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| 344 | ;-------------------------------------------------------------------- |
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| 345 | %ifdef USE_STR_LEN |
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| 346 | ALIGN JUMP_ALIGN |
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| 347 | String_StrLen: |
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| 348 | push cx ; Store CX |
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| 349 | mov al, STOP ; Load string end char to AL |
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| 350 | mov cx, -1 ; Scan for maximum string length |
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| 351 | call String_BuffHasChar ; Find offset for string ending char |
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| 352 | pop cx ; Restore CX |
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| 353 | ret |
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| 354 | %endif |
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| 355 | |
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| 356 | |
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| 357 | ;-------------------------------------------------------------------- |
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| 358 | ; Returns length for token string. Token strings ends to any whitespace |
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| 359 | ; character or to STOP. |
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| 360 | ; |
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| 361 | ; String_TokenLen |
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| 362 | ; Parameters: |
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| 363 | ; ES:DI: Pointer to token string |
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| 364 | ; Returns: |
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| 365 | ; AX: Token length in characters |
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| 366 | ; Corrupts registers: |
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| 367 | ; Nothing |
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| 368 | ;-------------------------------------------------------------------- |
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| 369 | %ifdef USE_STR_TOKEN |
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| 370 | ALIGN JUMP_ALIGN |
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| 371 | String_TokenLen: |
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| 372 | push bx ; Store BX |
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| 373 | xor bx, bx ; Zero BX for token length |
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| 374 | ALIGN JUMP_ALIGN |
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| 375 | .CharLoop: |
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| 376 | mov al, [es:di+bx] ; Load character to AL |
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| 377 | cmp al, STOP ; End of token? |
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| 378 | je .Return ; If so, return |
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| 379 | call String_IsSpace ; End of token? |
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| 380 | jc .Return ; If so, return |
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| 381 | inc bx ; Increment token length |
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| 382 | jmp .CharLoop ; Loop while characters left |
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| 383 | ALIGN JUMP_ALIGN |
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| 384 | .Return: |
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| 385 | mov ax, bx ; Copy string length to AX |
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| 386 | pop bx ; Restore BX |
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| 387 | ret |
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| 388 | %endif |
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| 389 | |
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| 390 | |
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| 391 | ;-------------------------------------------------------------------- |
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| 392 | ; Returns index and ptr to first occurrence of |
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| 393 | ; string 2 in string 1 (strstr on C). |
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| 394 | ; Strings must be STOP terminated strings. |
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| 395 | ; |
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| 396 | ; String_StrWithin |
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| 397 | ; Parameters: |
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| 398 | ; DS:SI: Pointer to string 1 |
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| 399 | ; ES:DI: Pointer to string 2 |
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| 400 | ; Returns: |
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| 401 | ; AX: Index to first occurrence of string 2 in string 1 |
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| 402 | ; DS:BX: Pointer to first occurrence of string 2 in string 1 |
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| 403 | ; CF: Set if string 2 was found in string 1 |
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| 404 | ; Cleared if string 2 was not found |
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| 405 | ; Corrupts registers: |
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| 406 | ; Nothing |
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| 407 | ;-------------------------------------------------------------------- |
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| 408 | %ifdef USE_STR_WITHIN |
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| 409 | ALIGN JUMP_ALIGN |
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| 410 | String_StrWithin: |
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| 411 | push cx ; Store CX |
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| 412 | push si ; Store SI |
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| 413 | call String_StrLen ; Load str2 length to AX |
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| 414 | mov cx, ax ; Copy str2 length to CX |
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| 415 | |
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| 416 | ALIGN JUMP_ALIGN |
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| 417 | .Str1CharLoop: |
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| 418 | cmp BYTE [si], STOP ; End of string? |
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| 419 | je .Str2NotFound ; If so, return FALSE |
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| 420 | call String_BuffCmp ; str2 found in str1? |
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| 421 | je .Str2Found ; If so, break loop |
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| 422 | add si, ax ; Add index to first unmatching char |
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| 423 | inc si ; Increment str1 ptr |
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| 424 | jmp .Str1CharLoop ; Loop while characters left |
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| 425 | |
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| 426 | ALIGN JUMP_ALIGN |
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| 427 | .Str2Found: |
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| 428 | mov bx, si ; Copy ptr to BX |
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| 429 | mov ax, si ; Copy ptr to AX |
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| 430 | pop si ; Restore SI |
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| 431 | pop cx ; Restore CX |
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| 432 | sub ax, si ; Calculate index to str2 in str1 |
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| 433 | stc ; Set CF since str2 found |
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| 434 | ret |
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| 435 | ALIGN JUMP_ALIGN |
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| 436 | .Str2NotFound: |
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[78] | 437 | xor bx, bx ; Zero BX and clear CF |
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[2] | 438 | pop si ; Restore SI |
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| 439 | pop cx ; Restore CX |
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| 440 | ret |
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| 441 | %endif |
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| 442 | |
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| 443 | |
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| 444 | ;-------------------------------------------------------------------- |
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| 445 | ; Returns pointer to wanted token inside STOP terminated string. |
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| 446 | ; Tokens are separated by any white space characters. |
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| 447 | ; |
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| 448 | ; String_StrToken |
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| 449 | ; Parameters: |
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| 450 | ; CX: Index of token to return |
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| 451 | ; ES:DI: Pointer to string |
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| 452 | ; Returns: |
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| 453 | ; AX: Token string length (if token found) |
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| 454 | ; ES:DI: Pointer to token (if token found) |
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| 455 | ; CF: Set if token found |
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| 456 | ; Cleared if token not found |
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| 457 | ; Corrupts registers: |
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| 458 | ; Nothing |
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| 459 | ;-------------------------------------------------------------------- |
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| 460 | %ifdef USE_STR_TOKEN |
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| 461 | ALIGN JUMP_ALIGN |
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| 462 | String_StrToken: |
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| 463 | push cx ; Store CX |
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| 464 | push si ; Store SI |
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| 465 | push ds ; Store DS |
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| 466 | push es ; Copy ES:DI to DS:SI |
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| 467 | pop ds |
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| 468 | mov si, di |
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| 469 | inc cx ; Increment to number of tokens to search |
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| 470 | cld ; LODSB to increment SI |
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| 471 | ALIGN JUMP_ALIGN |
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| 472 | .ConsumeWhite: |
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| 473 | lodsb ; Load char to AL from [DS:SI] |
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| 474 | cmp al, STOP ; End of string? |
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| 475 | je .NotFound ; If so, token was not found |
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| 476 | call String_IsSpace ; Any whitespace character? |
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| 477 | jc .ConsumeWhite ; If so, skip it |
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| 478 | dec si ; Decrement SI to point first non-space |
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| 479 | mov di, si ; Copy offset to token to DI |
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| 480 | ALIGN JUMP_ALIGN |
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| 481 | .TokenLoop: |
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| 482 | lodsb ; Load char to AL |
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| 483 | cmp al, STOP ; End of string? |
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| 484 | je .EndOfString ; If so, end token |
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| 485 | call String_IsSpace ; Any whitespace character? |
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| 486 | jnc .TokenLoop ; If not, loop |
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| 487 | loop .ConsumeWhite ; Loop until wanted token found |
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| 488 | .RetToken: |
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| 489 | pop ds ; Restore DS |
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| 490 | pop si ; Restore SI |
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| 491 | pop cx ; Restore CX |
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| 492 | call String_TokenLen ; Get token length to AX |
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| 493 | stc ; Set CF since token found |
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| 494 | ret |
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| 495 | ALIGN JUMP_ALIGN |
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| 496 | .EndOfString: |
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| 497 | dec si ; Offset to STOP |
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| 498 | cmp di, si ; STOP only char in token? |
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| 499 | je .NotFound ; If so, then it is not valid token |
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| 500 | loop .NotFound ; If last token was not wanted |
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| 501 | jmp .RetToken |
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| 502 | ALIGN JUMP_ALIGN |
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| 503 | .NotFound: |
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| 504 | pop ds ; Restore DS |
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| 505 | pop si ; Restore SI |
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| 506 | pop cx ; Restore CX |
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| 507 | clc ; Clear CF since token not found |
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| 508 | ret |
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| 509 | %endif |
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| 510 | |
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| 511 | |
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| 512 | ;-------------------------------------------------------------------- |
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| 513 | ; Converts a STOP terminated string to unsigned 32-bit integer. |
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| 514 | ; |
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| 515 | ; String_StrToUInt |
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| 516 | ; Parameters: |
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| 517 | ; ES:DI: Pointer to string to convert |
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| 518 | ; CX: Base (10=dec, 16=hex etc.) |
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| 519 | ; Returns: |
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| 520 | ; DX:AX: 32-bit unsigned integer |
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| 521 | ; CF: Set if converted successfully |
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| 522 | ; Cleared if error |
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| 523 | ; Corrupts registers: |
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| 524 | ; Nothing |
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| 525 | ;-------------------------------------------------------------------- |
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| 526 | %ifdef USE_STR_TOUINT |
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| 527 | ALIGN JUMP_ALIGN |
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| 528 | String_StrToUInt: |
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| 529 | push si |
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| 530 | call String_StrLen ; Get string length to AX |
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| 531 | mov si, ax ; Copy length to SI |
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| 532 | call String_BuffToUInt ; Convert to integer in DX:AX |
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| 533 | pop si |
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| 534 | ret |
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| 535 | %endif |
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| 536 | %if 0 |
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| 537 | String_StrToUInt: ; Faster but we want to minimize size |
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| 538 | ; Copy ES:DI to DS:SI |
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| 539 | push ds ; Store DS |
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| 540 | push si ; Store SI |
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| 541 | push bx ; Store BX |
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| 542 | mov si, di ; Copy ES:DI to DS:SI |
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| 543 | push es |
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| 544 | pop ds |
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| 545 | |
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| 546 | ; Prepare to read chars |
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| 547 | xor dx, dx ; Zero DX (HIWORD) |
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| 548 | xor bx, bx ; Zero BX (LOWORD) |
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| 549 | ALIGN JUMP_ALIGN |
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| 550 | .CharLoop: |
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| 551 | lodsb ; Load char to AL |
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| 552 | cmp al, STOP ; End of string? |
---|
| 553 | je .ConvComplete ; If so, break loop |
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| 554 | call String_IsBaseChar ; Is valid character? (AH=digit) |
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| 555 | jnc .RetFalse ; If not, return FALSE |
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| 556 | xchg ax, bx ; AX=LOWORD, BX=digit and char |
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| 557 | call Math_MulDWbyW ; DX:AX *= CX |
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| 558 | xchg ax, bx ; AX=digit and char, BX=LOWORD |
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| 559 | mov al, ah ; Copy digit to AL |
---|
| 560 | xor ah, ah ; Zero AH, AX=digit |
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| 561 | add bx, ax ; Add digit to LOWORD |
---|
| 562 | adc dx, 0 ; Add carry to HIWORD |
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| 563 | jmp .CharLoop ; Loop while valid characters |
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| 564 | ALIGN JUMP_ALIGN |
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| 565 | .ConvComplete: |
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| 566 | stc ; Set CF since success |
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| 567 | ALIGN JUMP_ALIGN |
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[78] | 568 | .RetFalse: ; If we jumped to here no CLC is needed to reflect a FALSE condition |
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| 569 | mov ax, bx ; Copy loword to AX (may be incomplete) |
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[2] | 570 | pop bx ; Restore BX |
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| 571 | pop si ; Restore SI |
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| 572 | pop ds ; Restore DS |
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| 573 | ret |
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| 574 | %endif |
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| 575 | |
---|
| 576 | |
---|
| 577 | ;-------------------------------------------------------------------- |
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| 578 | ; Converts upper case character to lower case character. |
---|
| 579 | ; |
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| 580 | ; String_ToLower |
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| 581 | ; Parameters: |
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| 582 | ; AL: Character to convert |
---|
| 583 | ; Returns: |
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| 584 | ; AL: Character with possible conversion |
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| 585 | ; Corrupts registers: |
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| 586 | ; Nothing |
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| 587 | ;-------------------------------------------------------------------- |
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| 588 | %ifdef USE_STR_TOLOWER |
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| 589 | ALIGN JUMP_ALIGN |
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| 590 | String_ToLower: |
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| 591 | call String_IsUpper ; Is upper case character? |
---|
| 592 | jnc .Return ; If not, return |
---|
| 593 | add al, 'a'-'A' ; Convert to lower case |
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| 594 | .Return: |
---|
| 595 | ret |
---|
| 596 | %endif |
---|
| 597 | |
---|
| 598 | |
---|
| 599 | ;-------------------------------------------------------------------- |
---|
| 600 | ; Converts lower case character to upper case character. |
---|
| 601 | ; |
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| 602 | ; String_ToUpper |
---|
| 603 | ; Parameters: |
---|
| 604 | ; AL: Character to convert |
---|
| 605 | ; Returns: |
---|
| 606 | ; AL: Character with possible conversion |
---|
| 607 | ; Corrupts registers: |
---|
| 608 | ; Nothing |
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| 609 | ;-------------------------------------------------------------------- |
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| 610 | %ifdef USE_STR_TOUPPER |
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| 611 | ALIGN JUMP_ALIGN |
---|
| 612 | String_ToUpper: |
---|
| 613 | call String_IsLower ; Is lower case character? |
---|
| 614 | jnc .Return ; If not, return |
---|
| 615 | sub al, 'a'-'A' ; Convert to upper case |
---|
| 616 | .Return: |
---|
| 617 | ret |
---|
| 618 | %endif |
---|