psxbios: Fixes save issues on Parasite Eve II, Parasite Eve I and others

Merging never-merged fix by Solus for Parasite Eve. I also fixed some GCC warnings
about dir->name going out of bounds too.
We also make sure to only add '/0' if string is not full and right after the last character in the dir array.

This fixes saving/loading in Parasite Eve II, Parasite Eve.
It also fixed regressions for the LEGO Racers where other games would break,
meaning this should be the proper fix for saves.

We're also using our own strlen implementation to avoid any issues or
relying on the libc's own strlen.

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 829deb0..fbc0002 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -322,9 +322,10 @@ static inline void LoadRegs() {
        SysPrintf("read %d: %x,%x (%s)\n", FDesc[1 + mcd].mcfile, FDesc[1 + mcd].offset, a2, Mcd##mcd##Data + 128 * FDesc[1 + mcd].mcfile + 0xa); \
        ptr = Mcd##mcd##Data + 8192 * FDesc[1 + mcd].mcfile + FDesc[1 + mcd].offset; \
        memcpy(Ra1, ptr, length); \
+       if (FDesc[1 + mcd].mode & 0x8000) { \
        DeliverEvent(0x11, 0x2); /* 0xf0000011, 0x0004 */ \
        DeliverEvent(0x81, 0x2); /* 0xf4000001, 0x0004 */ \
-       if (FDesc[1 + mcd].mode & 0x8000) v0 = 0; \
+       v0 = 0; } \
        else v0 = length; \
        FDesc[1 + mcd].offset += v0; \
 }
@@ -334,10 +335,11 @@ static inline void LoadRegs() {
        SysPrintf("write %d: %x,%x\n", FDesc[1 + mcd].mcfile, FDesc[1 + mcd].offset, a2); \
        ptr = Mcd##mcd##Data + offset; \
        memcpy(ptr, Ra1, length); \
+       FDesc[1 + mcd].offset += length; \
+       if (FDesc[1 + mcd].mode & 0x8000) { \
        DeliverEvent(0x11, 0x2); /* 0xf0000011, 0x0004 */ \
        DeliverEvent(0x81, 0x2); /* 0xf4000001, 0x0004 */ \
-       FDesc[1 + mcd].offset += length; \
-       if (FDesc[1 + mcd].mode & 0x8000) v0 = 0; \
+       v0 = 0; } \
        else v0 = length; \
 }
 
@@ -2208,7 +2210,18 @@ void psxBios_puts() { // 3e/3f
 char ffile[64], *pfile;
 int nfile;
 
+
+/* To avoid any issues with different behaviour when using the libc's own strlen instead.
+ * We want to mimic the PSX's behaviour in this case for bufile. */
+static size_t strlen_internal(char* p) 
+{
+       size_t size_of_array = 0;
+       while (*p++) size_of_array++;
+       return size_of_array;
+}
+
 #define bufile(mcd) { \
+       size_t size_of_name = strlen_internal(dir->name); \
        while (nfile < 16) { \
                int match=1; \
  \
@@ -2219,8 +2232,8 @@ int nfile;
                if (!ptr[0xa]) continue; \
                ptr+= 0xa; \
                if (pfile[0] == 0) { \
-                       strncpy(dir->name, ptr, sizeof(dir->name)); \
-                       dir->name[sizeof(dir->name) - 1] = '\0'; \
+                       strncpy(dir->name, ptr, sizeof(dir->name) - 1); \
+                       if (size_of_name < sizeof(dir->name)) dir->name[size_of_name] = '\0'; \
                } else for (i=0; i<20; i++) { \
                        if (pfile[i] == ptr[i]) { \
                                                                dir->name[i] = ptr[i]; continue; } \