24 lines
572 B
ArmAsm
24 lines
572 B
ArmAsm
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/* _strncpy() Author: Kees J. Bot */
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/* 1 Jan 1994 */
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/* char *_strncpy(char *s1, const char *s2, size_t ecx) */
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/* Copy string s2 to s1. */
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/* */
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.text
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.globl __strncpy
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.balign 16
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__strncpy:
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movl 12(%ebp), %edi /* edi = string s2 */
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xorb %al, %al /* Look for a zero byte */
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movl %ecx, %edx /* Save maximum count */
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cld
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repne scasb /* Look for end of s2 */
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subl %ecx, %edx /* Number of bytes in s2 including null */
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xchgl %edx, %ecx
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movl 12(%ebp), %esi /* esi = string s2 */
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movl 8(%ebp), %edi /* edi = string s1 */
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rep movsb /* Copy bytes */
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ret
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