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Decompile strlen

This commit is contained in:
Ryan Dwyer 2021-01-30 10:29:07 +10:00
parent 2b96f793d3
commit 9cb9a9b4d7
2 changed files with 11 additions and 16 deletions
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2
src/include/PR/os_misc.h
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@ -13,7 +13,7 @@ f32 sinf(f32 arg0);
f32 sqrtf(f32 arg0);
void *memcpy(void *, const void *, size_t);
u32 strlen(char *str);
size_t strlen(const char *s);
char *strchr(const char *s, int c);
#endif

25
src/lib/ultra/libc/string.c
View File

@ -17,21 +17,16 @@ glabel memcpy
/* 4a608: 00801025 */ or $v0,$a0,$zero
);
GLOBAL_ASM(
glabel strlen
/* 4a60c: 908e0000 */ lbu $t6,0x0($a0)
/* 4a610: 00801825 */ or $v1,$a0,$zero
/* 4a614: 11c00005 */ beqz $t6,.L0004a62c
/* 4a618: 00000000 */ nop
/* 4a61c: 906f0001 */ lbu $t7,0x1($v1)
.L0004a620:
/* 4a620: 24630001 */ addiu $v1,$v1,0x1
/* 4a624: 55e0fffe */ bnezl $t7,.L0004a620
/* 4a628: 906f0001 */ lbu $t7,0x1($v1)
.L0004a62c:
/* 4a62c: 03e00008 */ jr $ra
/* 4a630: 00641023 */ subu $v0,$v1,$a0
);
size_t strlen(const char *s)
{
const char *sc = s;
while (*sc) {
sc++;
}
return sc - s;
}
char *strchr(const char *s, int c)
{