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https://gitlab.os-k.eu/os-k-team/kvisc.git
synced 2023-08-25 14:05:46 +02:00
90 lines
1.3 KiB
Plaintext
90 lines
1.3 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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;
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; void itoa(char *buf, int num, int base)
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;
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itoa:
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mov ax3, 1
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jmp ltostr
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;
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; void utoa(char *buf, int num, int base)
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;
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utoa:
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xor ax3, ax3
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jmp ltostr
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;
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; void ltostr(char *buf, int num, int base, bool signed)
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;
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ltostr:
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mov rax, ax0
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xor r11, r11
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; make sure base is in [2, 32]
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b.b ax2, 2, .bad
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b.a ax2, 36, .bad
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; deal with zero
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b.z ax1, 0, .zero
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; deal with base 10 signedness
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test ax3, ax3
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cmp.nz ax2, 10 ; base 10
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j.nz .conv
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sgn r11, ax1 ; extract ax1 sign
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cmp r11, -1 ; negative?
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neg.z ax1, ax1
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; main loop
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.conv:
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b.z ax1, 0, .fini
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rem r10, ax1, ax2 ; ax1 % base
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b.a r10, 9, .nondec ; r10 > 9 ?
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add r10, '0'
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jmp .next
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.nondec:
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add r10, 55 ; 'A' - 10
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.next:
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mov b[ax0], r10
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inc ax0
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div ax1, ax1, ax2
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jmp .conv
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; add minus flag, null-terminate and reverse
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.fini:
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cmp r11, -1
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mov.z b[ax0], '-'
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inc.z ax0
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mov b[ax0], 0
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mov ax0, rax
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call strrev2
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ret
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;
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; exceptional cases
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;
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.bad:
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mov q[errno], EINVAL
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mov b[ax0], 0
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ret
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.zero:
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mov b[ax0], 48 ; '0'
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mov b[ax0+1], 0
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ret
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