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Decompile sprintf

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This commit is contained in:
Ryan Dwyer
2022-09-27 00:30:03 +10:00
parent c8e1ea19fc
commit eeb69c7119
1 changed files with 18 additions and 36 deletions
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src/lib/ultra/libc/sprintf.c
+18 -36
View File
@@ -1,42 +1,25 @@
#include <ultra64.h>
#include <ultratypes.h>
#include "stdarg.h"
char _Printf(char *(*prout)(char *, const char *, size_t), char *dst, const char *fmt, va_list args);
char *proutSprintf(char *dst, const char *src, size_t count)
{
return (char *)memcpy((u8 *)dst, (u8 *)src, count) + count;
return (char *) memcpy((u8 *) dst, (u8 *) src, count) + count;
}
#if MATCHING
GLOBAL_ASM(
glabel sprintf
/* 136b4: 27bdffe0 */ addiu $sp,$sp,-32
/* 136b8: afa40020 */ sw $a0,0x20($sp)
/* 136bc: afbf0014 */ sw $ra,0x14($sp)
/* 136c0: afa50024 */ sw $a1,0x24($sp)
/* 136c4: afa60028 */ sw $a2,0x28($sp)
/* 136c8: afa7002c */ sw $a3,0x2c($sp)
/* 136cc: 3c047001 */ lui $a0,%hi(proutSprintf)
/* 136d0: 24843690 */ addiu $a0,$a0,%lo(proutSprintf)
/* 136d4: 27a70028 */ addiu $a3,$sp,0x28
/* 136d8: 8fa60024 */ lw $a2,0x24($sp)
/* 136dc: 0c013b40 */ jal _Printf
/* 136e0: 8fa50020 */ lw $a1,0x20($sp)
/* 136e4: 04400004 */ bltz $v0,.L000136f8
/* 136e8: 00401825 */ or $v1,$v0,$zero
/* 136ec: 8fae0020 */ lw $t6,0x20($sp)
/* 136f0: 01c27821 */ addu $t7,$t6,$v0
/* 136f4: a1e00000 */ sb $zero,0x0($t7)
.L000136f8:
/* 136f8: 8fbf0014 */ lw $ra,0x14($sp)
/* 136fc: 27bd0020 */ addiu $sp,$sp,0x20
/* 13700: 03e00008 */ jr $ra
/* 13704: 00000000 */ nop
);
#else
// Mismatch:
// Goal takes v0 from _Printf and copies it to v1 but leaves v0 unmodified.
// The below copies v0 to v1 then back to v0 for the return.
int sprintf(char *dst, const char *fmt, ...)
/**
* Note: A match has only been found for this function if it returns void
* rather than the written length. However, there is code elsewhere in the game
* that reads sprintf's return value. ans is left in v0 so it happens to work
* correctly. Either the decompilation is accurate and the calling code uses an
* incorrect declaration for sprintf, or the decompilation is inaccurate and
* it actually returns ans.
*
* Also note this file is using an incorrect declaration for _Printf.
* _Printf returns an int, not a char.
*/
void sprintf(char *dst, const char *fmt, ...)
{
int ans;
va_list ap;
@@ -45,11 +28,10 @@ int sprintf(char *dst, const char *fmt, ...)
ans = _Printf(proutSprintf, dst, fmt, ap);
if (ans >= 0) {
dst[ans] = 0;
dst[ans] = '\0';
}
va_end(ap);
return ans;
if ((ans && ans) != 0);
}
#endif