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Implement scanf and fix sscanf to actually endian swap the results correctly

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5763 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-03-31 22:12:37 +00:00
parent 88a9a3e6e3
commit f9a88b684d
1 changed files with 97 additions and 2 deletions
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99
lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
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@ -410,17 +410,111 @@ GenericValue lle_X_printf(FunctionType *M, const vector<GenericValue> &Args) {
return GV;
}
static void ByteswapSCANFResults(const char *Fmt, void *Arg0, void *Arg1,
void *Arg2, void *Arg3, void *Arg4, void *Arg5,
void *Arg6, void *Arg7, void *Arg8) {
void *Args[] = { Arg0, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7, Arg8, 0 };
// Loop over the format string, munging read values as appropriate (performs
// byteswaps as neccesary).
unsigned ArgNo = 0;
while (*Fmt) {
if (*Fmt++ == '%') {
// Read any flag characters that may be present...
bool Suppress = false;
bool Half = false;
bool Long = false;
bool LongLong = false; // long long or long double
while (1) {
switch (*Fmt++) {
case '*': Suppress = true; break;
case 'a': /*Allocate = true;*/ break; // We don't need to track this
case 'h': Half = true; break;
case 'l': Long = true; break;
case 'q':
case 'L': LongLong = true; break;
default:
if (Fmt[-1] > '9' || Fmt[-1] < '0') // Ignore field width specs
goto Out;
}
}
Out:
// Read the conversion character
if (!Suppress && Fmt[-1] != '%') { // Nothing to do?
unsigned Size = 0;
const Type *Ty = 0;
switch (Fmt[-1]) {
case 'i': case 'o': case 'u': case 'x': case 'X': case 'n': case 'p':
case 'd':
if (Long || LongLong) {
Size = 8; Ty = Type::ULongTy;
} else if (Half) {
Size = 4; Ty = Type::UShortTy;
} else {
Size = 4; Ty = Type::UIntTy;
}
break;
case 'e': case 'g': case 'E':
case 'f':
if (Long || LongLong) {
Size = 8; Ty = Type::DoubleTy;
} else {
Size = 4; Ty = Type::FloatTy;
}
break;
case 's': case 'c': case '[': // No byteswap needed
Size = 1;
Ty = Type::SByteTy;
break;
default: break;
}
if (Size) {
GenericValue GV;
void *Arg = Args[ArgNo++];
memcpy(&GV, Arg, Size);
TheInterpreter->StoreValueToMemory(GV, (GenericValue*)Arg, Ty);
}
}
}
}
}
// int sscanf(const char *format, ...);
GenericValue lle_X_sscanf(FunctionType *M, const vector<GenericValue> &args) {
assert(args.size() < 10 && "Only handle up to 10 args to sscanf right now!");
const char *Args[10];
char *Args[10];
for (unsigned i = 0; i < args.size(); ++i)
Args[i] = (const char*)GVTOP(args[i]);
Args[i] = (char*)GVTOP(args[i]);
GenericValue GV;
GV.IntVal = sscanf(Args[0], Args[1], Args[2], Args[3], Args[4],
Args[5], Args[6], Args[7], Args[8], Args[9]);
ByteswapSCANFResults(Args[1], Args[2], Args[3], Args[4],
Args[5], Args[6], Args[7], Args[8], Args[9], 0);
return GV;
}
// int scanf(const char *format, ...);
GenericValue lle_X_scanf(FunctionType *M, const vector<GenericValue> &args) {
assert(args.size() < 10 && "Only handle up to 10 args to scanf right now!");
char *Args[10];
for (unsigned i = 0; i < args.size(); ++i)
Args[i] = (char*)GVTOP(args[i]);
GenericValue GV;
GV.IntVal = scanf(Args[0], Args[1], Args[2], Args[3], Args[4],
Args[5], Args[6], Args[7], Args[8], Args[9]);
ByteswapSCANFResults(Args[0], Args[1], Args[2], Args[3], Args[4],
Args[5], Args[6], Args[7], Args[8], Args[9]);
return GV;
}
@ -644,6 +738,7 @@ void Interpreter::initializeExternalMethods() {
FuncNames["lle_X_printf"] = lle_X_printf;
FuncNames["lle_X_sprintf"] = lle_X_sprintf;
FuncNames["lle_X_sscanf"] = lle_X_sscanf;
FuncNames["lle_X_scanf"] = lle_X_scanf;
FuncNames["lle_i_clock"] = lle_i_clock;
FuncNames["lle_X_fopen"] = lle_X_fopen;
FuncNames["lle_X_fclose"] = lle_X_fclose;