projects / vvhitespace / blame
| Commit | Line | Data |
|---|---|---|
| 48f88489 AT |
1 | @ (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com> |
| 2 | @ See LICENSE.txt file for copyright and license details. | |
| 3 | ||
| ae1f85a1 AT |
4 | #ifndef VVS_STDLIB_STRING |
| 5 | #define VVS_STDLIB_STRING | |
| 6 | ||
| 7 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | |
| 8 | @ Name: | |
| 9 | @ strlen (100000) | |
| 10 | @ Description: | |
| 11 | @ Counts number of words in a null-terminated string. | |
| 12 | @ Returned number does not include the null-terminator. | |
| 13 | @ Call Stack: | |
| 14 | @ pointer to first character <-- TOS | |
| 15 | @ Return Stack: | |
| 16 | @ number of words in string <-- TOS | |
| 17 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | |
| 18 | NSSVTSSSSSN | Mark: 100000 (strlen) | |
| 19 | ||
| 20 | @ Create a length counter. | |
| 21 | SSSSN | PUSH 0 | |
| 22 | SNT | SWAP | |
| 23 | ||
| 24 | @ Increment the counter (and pointer) on each pass through the loop. | |
| 25 | NSSVSSTSSSSSSSSSSSSSN | Mark: 00100000 00000000 | |
| 26 | SNS | DUP | |
| 27 | TTT | LOAD | |
| 28 | NTSSSTSSSSSSSSSSSSTN | BRZ > 00100000 00000001 | |
| 29 | SNT | SWAP | |
| 30 | SSSTN | PUSH 1 | |
| 31 | TSSS | ADD | |
| 32 | SNT | SWAP | |
| 33 | SSSTN | PUSH 1 | |
| 34 | TSSS | ADD | |
| 35 | NSNSSTSSSSSSSSSSSSSN | JMP > 00100000 00000000 | |
| 36 | ||
| 37 | @ Clean up and return. | |
| 38 | NSSVSSTSSSSSSSSSSSSTN | Mark: 00100000 00000001 | |
| 39 | SNN | DROP | |
| 40 | NTN | RTS | |
| 41 | ||
| 0e0d0a4a AT |
42 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 43 | @ Name: | |
| 44 | @ isdigit (100001) | |
| 45 | @ Description: | |
| 46 | @ Tests 'character' on stack. Is it an ASCII number? | |
| 47 | @ Returns 1 or 0 representing True/False. | |
| 48 | @ Call Stack: | |
| 49 | @ character <-- TOS | |
| 50 | @ Return Stack: | |
| 51 | @ 1 or 0 <-- TOS | |
| 52 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | |
| 53 | NSSVTSSSSTN | Mark: 100001 (isdigit) | |
| 54 | ||
| 55 | SSSSSTTSSSSN | PUSH 48 (ASCII '0') | |
| 56 | TSST | SUBTRACT | |
| 57 | SNS | DUP | |
| 58 | NTTSSTSSSSTSSSSSSSSN | BMI > 00100001 00000000 (not digit) | |
| 59 | SNS | DUP | |
| 60 | SSSTSTSN | PUSH 10 | |
| 61 | TSST | SUBTRACT | |
| 62 | NTTSSTSSSSTSSSSSSSTN | BMI > 00100001 00000001 (is digit) | |
| 63 | ||
| 64 | NSSVSSTSSSSTSSSSSSSSN | Mark: 00100001 00000000 (not digit) | |
| 65 | SNN | DROP | |
| 66 | SSSSN | PUSH 0 | |
| 67 | NTN | RTS | |
| 68 | ||
| 69 | NSSVSSTSSSSTSSSSSSSTN | Mark: 00100001 00000001 (is digit) | |
| 70 | SNN | DROP | |
| 71 | SSSTN | PUSH 1 | |
| 72 | NTN | RTS | |
| 73 | ||
| fada5085 AT |
74 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 75 | @ Name: | |
| 76 | @ get_user_string | |
| 77 | @ Description: | |
| 78 | @ Read one line of user input or read buffer_size characters, whichever comes | |
| 79 | @ first, and store at buffer_address. | |
| 80 | @ Appends null terminator to end of string. | |
| 81 | @ Call Stack: | |
| 82 | @ buffer_size (>0) | |
| 83 | @ buffer_address <-- TOS | |
| 84 | @ Return Stack: | |
| 85 | @ <empty> | |
| 86 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | |
| 87 | #include <stack.pvvs> | |
| 88 | NSSVTSSSTSN | MARK: 100010 (get_user_string) | |
| 89 | ||
| 90 | @ Verify we were handed a plausible buffer size. | |
| 91 | SNT | SWAP | |
| 92 | SNS | DUP | |
| 93 | NTSSSTSSSTSSSSSSSSSN | BRZ > 00100010 00000000 (get_user_string:bad_buffer_size) | |
| 94 | SNS | DUP | |
| 95 | NTTSSTSSSTSSSSSSSSSN | BMI > 00100010 00000000 (get_user_string:bad_buffer_size) | |
| 96 | SNT | SWAP | |
| 97 | ||
| 98 | @ Push an offset counter on to the stack for use inside the loop. | |
| 99 | SSSSN | PUSH 0 | |
| 100 | ||
| 101 | @ Get one character from user on each pass through this loop. | |
| 102 | @ TOS> offset, buffer_addr, buffer_size | |
| 103 | NSSVSSTSSSTSSSSSSSSTN | MARK: 00100010 00000001 (get_user_string:main_loop) | |
| 104 | @ Have we reached the end of the buffer? | |
| 105 | SSSTTN | PUSH 3 | |
| 106 | NSTTTSSN | JSR > 1100 (deepdup) | |
| 107 | SSSTSN | PUSH 2 | |
| 108 | NSTTTSSN | JSR > 1100 (deepdup) | |
| 109 | TSST | SUBTRACT | |
| 110 | SSSTN | PUSH 1 | |
| 111 | TSST | SUBTRACT | |
| 112 | NTSSSTSSSTSSSSSSSTTN | BRZ > 00100010 00000011 (get_user_string:end_of_buffer) | |
| 113 | @ Get a character, store it in the buffer, and echo it back to user. | |
| 114 | SNS | DUP | |
| 115 | SSSTTN | PUSH 3 | |
| 116 | NSTTTSSN | JSR > 1100 (deepdup) | |
| 117 | TSSS | ADD | |
| 118 | SNS | DUP | |
| 119 | TNTS | GETCHAR | |
| 120 | TTT | LOAD | |
| 121 | SNS | DUP (for later testing) | |
| 122 | TNSS | PUTCHAR | |
| 123 | @ Did the user press ENTER? | |
| 124 | SSSTSTSN | PUSH 10 (ASCII '\n') | |
| 125 | TSST | SUBTRACT | |
| 126 | NTSSSTSSSTSSSSSSSTSN | BRZ > 00100010 00000010 (get_user_string:end_of_line) | |
| 127 | @ User did not press ENTER. Increment offset and loop again. | |
| 128 | SSSTN | PUSH 1 | |
| 129 | TSSS | ADD | |
| 130 | NSNSSTSSSTSSSSSSSSTN | JMP > 00100010 00000001 (get_user_string:main_loop) | |
| 131 | ||
| 132 | NSSVSSTSSSTSSSSSSSTSN | MARK: 00100010 00000010 (get_user_string:end_of_line) | |
| 133 | TSSS | ADD | |
| 134 | SSSSN | PUSH 0 (ASCII '\0') | |
| 135 | TTS | STORE | |
| 136 | SNN | DROP | |
| 137 | NTN | RTS | |
| 138 | ||
| 139 | NSSVSSTSSSTSSSSSSSTTN | MARK: 00100010 00000011 (get_user_string:end_of_buffer) | |
| 140 | SNN | DROP | |
| 141 | TSSS | ADD | |
| 142 | SSSTN | PUSH 1 | |
| 143 | TSST | SUBTRACT | |
| 144 | SSSSN | PUSH 0 (ASCII '\0') | |
| 145 | TTS | STORE | |
| 146 | NTN | RTS | |
| 147 | ||
| 148 | NSSVSSTSSSTSSSSSSSSSN | MARK: 00100010 00000000 (get_user_string:bad_buffer_size) | |
| 149 | SNN | DROP | |
| 150 | SNN | DROP | |
| 151 | NNN | DIE | |
| 152 | ||
| ae1f85a1 | 153 | #endif |