#       _strncat()                                 Author: Kees J. Bot
#                                                  1 Jan 1994
# char *_strncat(char *s1, const char *s2, size_t edx)
#	Append string s2 to s1.
#

.intel_syntax

.global __strncat

        .text
	.align	16
__strncat:
	push	ebp
	mov	ebp, esp
	push	esi
	push	edi
        mov     edi, [ebp+8]    # String s1
	mov	ecx, -1
	xorb	al, al		# Null byte
	cld
	repne
	scasb			# Look for the zero byte in s1
	dec	edi		# Back one up (and clear 'Z' flag)
	push	edi		# Save end of s1
        mov     edi, [12+ebp]   # edi = string s2
	mov	ecx, edx	# Maximum count
	repne
	scasb			# Look for the end of s2
	jne	no0
	inc	ecx		# Exclude null byte
no0:	sub	edx, ecx	# Number of bytes in s2
	mov	ecx, edx
        mov     esi, [12+ebp]   # esi = string s2
	pop	edi		# edi = end of string s1
	rep
	movsb			# Copy bytes
	stosb			# Add a terminating null
        mov     eax, [8+ebp]    # Return s1
	pop	edi
	pop	esi
	pop	ebp
	ret