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Decompile strchr

This commit is contained in:
Ryan Dwyer 2021-01-30 10:28:20 +10:00
parent ecb623d6d0
commit 2b96f793d3
2 changed files with 15 additions and 26 deletions
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2
src/include/PR/os_misc.h
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@ -14,6 +14,6 @@ f32 sqrtf(f32 arg0);
void *memcpy(void *, const void *, size_t);
u32 strlen(char *str);
u32 strchr(void);
char *strchr(const char *s, int c);
#endif

39
src/lib/ultra/libc/string.c
View File

@ -33,28 +33,17 @@ glabel strlen
/* 4a630: 00641023 */ subu $v0,$v1,$a0
);
GLOBAL_ASM(
glabel strchr
/* 4a634: 90830000 */ lbu $v1,0x0($a0)
/* 4a638: 30ae00ff */ andi $t6,$a1,0xff
/* 4a63c: 30a200ff */ andi $v0,$a1,0xff
/* 4a640: 51c3000a */ beql $t6,$v1,.L0004a66c
/* 4a644: 00801025 */ or $v0,$a0,$zero
.L0004a648:
/* 4a648: 54600004 */ bnezl $v1,.L0004a65c
/* 4a64c: 90830001 */ lbu $v1,0x1($a0)
/* 4a650: 03e00008 */ jr $ra
/* 4a654: 00001025 */ or $v0,$zero,$zero
/* 4a658: 90830001 */ lbu $v1,0x1($a0)
.L0004a65c:
/* 4a65c: 24840001 */ addiu $a0,$a0,0x1
/* 4a660: 1443fff9 */ bne $v0,$v1,.L0004a648
/* 4a664: 00000000 */ nop
/* 4a668: 00801025 */ or $v0,$a0,$zero
.L0004a66c:
/* 4a66c: 03e00008 */ jr $ra
/* 4a670: 00000000 */ nop
/* 4a674: 00000000 */ nop
/* 4a678: 00000000 */ nop
/* 4a67c: 00000000 */ nop
);
char *strchr(const char *s, int c)
{
const char ch = c;
while (*s != ch) {
if (*s == 0) {
return NULL;
}
s++;
}
return (char *)s;
}