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Bug: Cast to i16 was failing, casted unsigned char to sbyte before promoting

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This commit is contained in:
Joseph Ferano 2024-01-15 11:59:51 +07:00
parent f4d6835694
commit 2a92f04836
1 changed files with 6 additions and 5 deletions
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11
decode.c
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@ -55,7 +55,7 @@ char* memory[65536];
/// Get Effective Address Calculation Registers /// Get Effective Address Calculation Registers
char* get_eac_registers(char rm) char* get_eac_registers(char rm)
{ {
char *reg_name; char* reg_name;
switch (rm) switch (rm)
{ {
case 0b000: case 0b000:
@ -89,14 +89,15 @@ char* get_eac_registers(char rm)
return reg_name; return reg_name;
} }
static inline char *reg_name(Register reg, char wide) static inline char* reg_name(Register reg, char wide)
{ {
return wide == 1 ? reg.fullname : reg.bytename; return wide == 1 ? reg.fullname : reg.bytename;
} }
static inline i16 get_data(unsigned char *buf, char wide) static inline i16 get_data(unsigned char* buf, char wide)
{ {
return wide == 1 ? (i16)buf[1] << 8 | buf[0] : buf[0]; // Cast buf[0] to sbyte if not the conversion to i16 won't detect signedness
return wide == 1 ? (i16)buf[1] << 8 | buf[0] : (sbyte)buf[0];
} }
int main(int argc, char** argv) int main(int argc, char** argv)
@ -153,7 +154,7 @@ int main(int argc, char** argv)
if (bytes_to_read > 0) if (bytes_to_read > 0)
{ {
i16 disp = get_data(buf, bytes_to_read - 1); i16 disp = get_data(buf, bytes_to_read - 1);
if (disp > 0) sprintf(disp_buf, " %s %d", disp >= 0 ? "+" : "-", abs(disp)); sprintf(disp_buf, " %s %hd", disp >= 0 ? "+" : "-", abs(disp));
} }
Register reg = registers[reg_idx]; Register reg = registers[reg_idx];
if (d) printf("mov %s, [%s%s] ;1", reg_name(reg, w), eac_name, disp_buf); if (d) printf("mov %s, [%s%s] ;1", reg_name(reg, w), eac_name, disp_buf);