44 lines
1020 B
ArmAsm
44 lines
1020 B
ArmAsm
# _strncat() Author: Kees J. Bot
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# 1 Jan 1994
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# char *_strncat(char *s1, const char *s2, size_t edx)
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# Append string s2 to s1.
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#
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.intel_syntax
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.global __strncat
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.text
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.align 16
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__strncat:
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push ebp
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mov ebp, esp
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push esi
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push edi
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mov edi, [ebp+8] # String s1
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mov ecx, -1
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xorb al, al # Null byte
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cld
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repne
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scasb # Look for the zero byte in s1
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dec edi # Back one up (and clear 'Z' flag)
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push edi # Save end of s1
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mov edi, [12+ebp] # edi = string s2
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mov ecx, edx # Maximum count
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repne
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scasb # Look for the end of s2
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jne no0
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inc ecx # Exclude null byte
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no0: sub edx, ecx # Number of bytes in s2
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mov ecx, edx
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mov esi, [12+ebp] # esi = string s2
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pop edi # edi = end of string s1
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rep
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movsb # Copy bytes
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stosb # Add a terminating null
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mov eax, [8+ebp] # Return s1
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pop edi
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pop esi
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pop ebp
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ret
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