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https://gitlab.os-k.eu/os-k-team/kvisc.git
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54 lines
913 B
Plaintext
54 lines
913 B
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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;
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; int strcmp(const char *str1, const char *str2)
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;
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; Returns:
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; 0 if the contents of both strings are equal
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; >0 if the first character that does not match has a greater value in str1 than in str2
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; <0 if the first character that does not match has a lower value in str1 than in str2
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;
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strcmp:
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mov rcx, zero
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.l:
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movzx rax, b[ax0+rcx]
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movzx rdx, b[ax1+rcx]
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cmp rax, rdx
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jmp.nz .r
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; both zero?
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add rbx, rax, rdx
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jmp.bxz .r
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inc rcx, 1
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jmp .l
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.r:
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dec rax, rdx
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ret
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;
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; int strncmp(const char *str1, const char *str2, int maxn)
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;
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strncmp:
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mov rcx, ax2
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jmp.cxz .r
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.l:
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movzx rax, b[ax0]
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movzx rdx, b[ax1]
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cmp rax, rdx
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jmp.nz .r
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inc ax0, 1
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inc ax1, 1
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loop .l
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.r:
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dec rax, rdx
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ret
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