mirror of
https://gitlab.os-k.eu/os-k-team/kvisc.git
synced 2023-08-25 14:05:46 +02:00
58 lines
1.1 KiB
Plaintext
58 lines
1.1 KiB
Plaintext
; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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.try_exec:
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; try without appending ".com"
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mov rax, Sys.OpenFile
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mov ax0, argv0
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trap 0
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; we good?
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blte zero, rax, .do_exec
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; nope, append ".com" and try again
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sub rcx, argbuf.size, 5
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scasb ax0, zero ; find null-term
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mov b[ax0+0], '.' ; ".com"
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mov b[ax0+1], 'c'
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mov b[ax0+2], 'o'
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mov b[ax0+3], 'm'
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nul b[ax0+4]
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; try again
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mov rax, Sys.OpenFile
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mov ax0, argv0
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trap 0
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; still no good?
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bltz rax, .exec_not_found
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.do_exec:
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; load file into memory
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mov ax0, rax
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mov ax1, FILE_LOADP
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mov ax2, FILE_MAXSZ
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mov rax, Sys.ReadFile
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trap 0
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; save load address
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mov rcx, rax
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; close file
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mov rax, Sys.CloseFile
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trap 0
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; read anything?
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bltz rcx, .couldnt_read
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jrcxz .empty_file
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; all good, let's go
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mov rax, Sys.ExecuteInFrame
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mov ax0, FILE_LOADP
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mov ax1, 5
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trap 0
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; unreachable
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jmp abort
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