84 lines
1.3 KiB
Plaintext
84 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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mov ax3, zero
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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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; 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, zero, .is_zero
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; deal with base 10 signedness
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b.z ax3, zero, .conv
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b.nz ax2, 10, .conv ; base 10
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shr rcx, ax1, 63 ; extract ax1 sign
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sub.cxnz ax1, zero, ax1 ; NEG if negative
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; main loop
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.conv:
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b.z ax1, zero, .fini
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rem rdx, ax1, ax2 ; ax1 % base
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b.a rdx, 9, .nondec ; rdx > 9 ?
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inc rdx, '0'
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jmp .next
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.nondec:
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inc rdx, 55 ; 'A' - 10
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.next:
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mov b[ax0], rdx
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inc ax0, 1
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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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mov.cxnz b[ax0], '-'
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add.cxnz ax0, ax0, 1
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mov b[ax0], zero
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call strrev2, rax
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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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.is_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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