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36 lines
749 B
ArmAsm
36 lines
749 B
ArmAsm
/* strrchr() Author: Kees J. Bot */
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/* 2 Jan 1994 */
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/* char *strrchr(const char *s, int c) */
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/* Look for the last occurrence a character in a string. */
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/* */
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#include "asm.h"
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ENTRY(strrchr)
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push %ebp
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movl %esp, %ebp
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push %edi
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movl 8(%ebp), %edi /* edi = string */
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movl $-1, %ecx
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xorb %al, %al
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cld
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repne scasb /* Look for the end of the string */
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notl %ecx /* -1 - ecx = Length of the string + null */
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decl %edi /* Put edi back on the zero byte */
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movb 12(%ebp), %al /* The character to look for */
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std /* Downwards search */
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repne scasb
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cld /* Direction bit back to default */
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jne failure
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leal 1(%edi), %eax /* Found it */
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pop %edi
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pop %ebp
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ret
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failure:
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xorl %eax, %eax /* Not there */
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pop %edi
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pop %ebp
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ret
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