102 lines
1.9 KiB
NASM
102 lines
1.9 KiB
NASM
;
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; public exported functions
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;
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global _asm_ucs4_strstr
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global _asm_ucs4_strchr
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;
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; code section
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;
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section '.text'
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; constants
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npos db -1
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;================================================================================
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;
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; Поиск подстроки в строке UCS-4 (алгоритм "в лоб", подойдет для коротких строк)
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;
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; rdi: указатель на исходную строку
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; rsi: длина исходной строки символах
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; rdx: указатель на искомую подстроку
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; rcx: длина подстроки в символах
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;
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;================================================================================
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_asm_ucs4_strstr:
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push r12
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mov r9d, dword [rdx]
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mov rax, rdx
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lea r8, [rdi + rsi*4]
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lea r10, [rdx + rcx*4]
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strstr_try_next_symbol:
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cmp r9d, dword [rdi]
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je strstr_init_counter
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add rdi, 4
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cmp rdi, r8
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jne strstr_try_next_symbol
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pop r12
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mov rax, 0
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ret
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strstr_init_counter:
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mov rdx, rax
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mov r12, rdi
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strstr_symbol_found:
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add rdx, 4
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cmp rdx, r10
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je strstr_the_end
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add r12, 4
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mov r11d, dword [r12]
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cmp r11d, dword [rdx]
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je strstr_symbol_found
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add rdi, 4
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jmp strstr_try_next_symbol
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strstr_the_end:
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pop r12
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mov rax, rdi
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ret
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;================================================================================
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;
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; Поиск символа в строке UCS-4
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;
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; rdi: указатель на исходную строку
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; rsi: длина исходной строки символах
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; rdx: искомый символ
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;
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;================================================================================
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_asm_ucs4_strchr:
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xor r8, r8
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try_next_symbol:
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cmp rdx, [rdi]
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je symbol_found
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add rdi, 4
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inc r8
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cmp rsi, r8
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jne try_next_symbol
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mov rax, 0
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ret
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symbol_found:
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mov rax, rdi
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ret
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