static void Stringize (StrBuf* Source, StrBuf* Target) /* Stringize the given string: Add double quotes at start and end and preceed * each occurance of " and \ by a backslash. */ { char C; /* Add a starting quote */ SB_AppendChar (Target, '\"'); /* Replace any characters inside the string may not be part of a string * unescaped. */ while ((C = SB_Get (Source)) != '\0') { switch (C) { case '\"': case '\\': SB_AppendChar (Target, '\\'); /* FALLTHROUGH */ default: SB_AppendChar (Target, C); break; } } /* Add the closing quote */ SB_AppendChar (Target, '\"'); }
static int GetComma (StrBuf* B) /* Expects and skips a comma in B. Prints an error and returns zero if no * comma is found. Return a value <> 0 otherwise. */ { SB_SkipWhite (B); if (SB_Get (B) != ',') { Error ("Comma expected"); return 0; } SB_SkipWhite (B); return 1; }
static void FuncSPrintF (void) /* Handle the .SPRINTF function */ { StrBuf Format = STATIC_STRBUF_INITIALIZER; /* User supplied format */ StrBuf R = STATIC_STRBUF_INITIALIZER; /* Result string */ StrBuf F1 = STATIC_STRBUF_INITIALIZER; /* One format spec from F */ StrBuf R1 = STATIC_STRBUF_INITIALIZER; /* One result */ char C; int Done; long IVal; /* Integer value */ /* Skip the .SPRINTF token */ NextTok (); /* Left paren expected */ ConsumeLParen (); /* First argument is a format string. Remember and skip it */ if (!LookAtStrCon ()) { return; } SB_Copy (&Format, &CurTok.SVal); NextTok (); /* Walk over the format string, generating the function result in R */ while (1) { /* Get the next char from the format string and check for EOS */ if (SB_Peek (&Format) == '\0') { break; } /* Check for a format specifier */ if (SB_Peek (&Format) != '%') { /* No format specifier, just copy */ SB_AppendChar (&R, SB_Get (&Format)); continue; } SB_Skip (&Format); if (SB_Peek (&Format) == '%') { /* %% */ SB_AppendChar (&R, '%'); SB_Skip (&Format); continue; } if (SB_Peek (&Format) == '\0') { InvalidFormatString (); break; } /* Since a format specifier follows, we do expect anotehr argument for * the .sprintf function. */ ConsumeComma (); /* We will copy the format spec into F1 checking for the things we * support, and later use xsprintf to do the actual formatting. This * is easier than adding another printf implementation... */ SB_Clear (&F1); SB_AppendChar (&F1, '%'); /* Check for flags */ Done = 0; while ((C = SB_Peek (&Format)) != '\0' && !Done) { switch (C) { case '-': /* FALLTHROUGH */ case '+': /* FALLTHROUGH */ case ' ': /* FALLTHROUGH */ case '#': /* FALLTHROUGH */ case '0': SB_AppendChar (&F1, SB_Get (&Format)); break; default: Done = 1; break; } } /* We do only support a numerical width field */ while (IsDigit (SB_Peek (&Format))) { SB_AppendChar (&F1, SB_Get (&Format)); } /* Precision - only positive numerical fields supported */ if (SB_Peek (&Format) == '.') { SB_AppendChar (&F1, SB_Get (&Format)); while (IsDigit (SB_Peek (&Format))) { SB_AppendChar (&F1, SB_Get (&Format)); } } /* Length modifiers aren't supported, so read the conversion specs */ switch (SB_Peek (&Format)) { case 'd': case 'i': case 'o': case 'u': case 'X': case 'x': /* Our ints are actually longs, so we use the 'l' modifier when * calling xsprintf later. Terminate the format string. */ SB_AppendChar (&F1, 'l'); SB_AppendChar (&F1, SB_Get (&Format)); SB_Terminate (&F1); /* The argument must be a constant expression */ IVal = ConstExpression (); /* Format this argument according to the spec */ SB_Printf (&R1, SB_GetConstBuf (&F1), IVal); /* Append the formatted argument to the result */ SB_Append (&R, &R1); break; case 's': /* Add the format spec and terminate the format */ SB_AppendChar (&F1, SB_Get (&Format)); SB_Terminate (&F1); /* The argument must be a string constant */ if (!LookAtStrCon ()) { /* Make it one */ SB_CopyStr (&CurTok.SVal, "**undefined**"); } /* Format this argument according to the spec */ SB_Printf (&R1, SB_GetConstBuf (&F1), SB_GetConstBuf (&CurTok.SVal)); /* Skip the string constant */ NextTok (); /* Append the formatted argument to the result */ SB_Append (&R, &R1); break; case 'c': /* Add the format spec and terminate the format */ SB_AppendChar (&F1, SB_Get (&Format)); SB_Terminate (&F1); /* The argument must be a constant expression */ IVal = ConstExpression (); /* Check for a valid character range */ if (IVal <= 0 || IVal > 255) { Error ("Char argument out of range"); IVal = ' '; } /* Format this argument according to the spec. Be sure to pass * an int as the char value. */ SB_Printf (&R1, SB_GetConstBuf (&F1), (int) IVal); /* Append the formatted argument to the result */ SB_Append (&R, &R1); break; default: Error ("Invalid format string"); SB_Skip (&Format); break; } } /* Terminate the result string */ SB_Terminate (&R); /* We expect a closing parenthesis, but will not skip it but replace it * by the string token just created. */ if (CurTok.Tok != TOK_RPAREN) { Error ("`)' expected"); } else { CurTok.Tok = TOK_STRCON; SB_Copy (&CurTok.SVal, &R); SB_Terminate (&CurTok.SVal); } /* Delete the string buffers */ SB_Done (&Format); SB_Done (&R); SB_Done (&F1); SB_Done (&R1); }
static void FuncIdent (void) /* Handle the .IDENT function */ { StrBuf Buf = STATIC_STRBUF_INITIALIZER; token_t Id; unsigned I; /* Skip it */ NextTok (); /* Left paren expected */ ConsumeLParen (); /* The function expects a string argument */ if (!LookAtStrCon ()) { return; } /* Check that the string contains a valid identifier. While doing so, * determine if it is a cheap local, or global one. */ SB_Reset (&CurTok.SVal); /* Check for a cheap local symbol */ if (SB_Peek (&CurTok.SVal) == LocalStart) { SB_Skip (&CurTok.SVal); Id = TOK_LOCAL_IDENT; } else { Id = TOK_IDENT; } /* Next character must be a valid identifier start */ if (!IsIdStart (SB_Get (&CurTok.SVal))) { NoIdent (); return; } for (I = SB_GetIndex (&CurTok.SVal); I < SB_GetLen (&CurTok.SVal); ++I) { if (!IsIdChar (SB_AtUnchecked (&CurTok.SVal, I))) { NoIdent (); return; } } if (IgnoreCase) { UpcaseSVal (); } /* If anything is ok, save and skip the string. Check that the next token * is a right paren, then replace the token by an identifier token. */ SB_Copy (&Buf, &CurTok.SVal); NextTok (); if (CurTok.Tok != TOK_RPAREN) { Error ("`)' expected"); } else { CurTok.Tok = Id; SB_Copy (&CurTok.SVal, &Buf); SB_Terminate (&CurTok.SVal); } /* Free buffer memory */ SB_Done (&Buf); }
static void IFNextChar (CharSource* S) /* Read the next character from the input file */ { /* Check for end of line, read the next line if needed */ while (SB_GetIndex (&S->V.File.Line) >= SB_GetLen (&S->V.File.Line)) { unsigned Len; /* End of current line reached, read next line */ SB_Clear (&S->V.File.Line); while (1) { int N = fgetc (S->V.File.F); if (N == EOF) { /* End of file. Accept files without a newline at the end */ if (SB_NotEmpty (&S->V.File.Line)) { break; } /* No more data - add an empty line to the listing. This ** is a small hack needed to keep the PC output in sync. */ NewListingLine (&EmptyStrBuf, S->V.File.Pos.Name, FCount); C = EOF; return; /* Check for end of line */ } else if (N == '\n') { /* End of line */ break; /* Collect other stuff */ } else { /* Append data to line */ SB_AppendChar (&S->V.File.Line, N); } } /* If we come here, we have a new input line. To avoid problems ** with strange line terminators, remove all whitespace from the ** end of the line, then add a single newline. */ Len = SB_GetLen (&S->V.File.Line); while (Len > 0 && IsSpace (SB_AtUnchecked (&S->V.File.Line, Len-1))) { --Len; } SB_Drop (&S->V.File.Line, SB_GetLen (&S->V.File.Line) - Len); SB_AppendChar (&S->V.File.Line, '\n'); /* Terminate the string buffer */ SB_Terminate (&S->V.File.Line); /* One more line */ S->V.File.Pos.Line++; /* Remember the new line for the listing */ NewListingLine (&S->V.File.Line, S->V.File.Pos.Name, FCount); } /* Set the column pointer */ S->V.File.Pos.Col = SB_GetIndex (&S->V.File.Line); /* Return the next character from the buffer */ C = SB_Get (&S->V.File.Line); }
static void NumericConst (void) /* Parse a numeric constant */ { unsigned Base; /* Temporary number base */ unsigned Prefix; /* Base according to prefix */ StrBuf S = STATIC_STRBUF_INITIALIZER; int IsFloat; char C; unsigned DigitVal; unsigned long IVal; /* Value */ /* Check for a leading hex or octal prefix and determine the possible ** integer types. */ if (CurC == '0') { /* Gobble 0 and examine next char */ NextChar (); if (toupper (CurC) == 'X') { Base = Prefix = 16; NextChar (); /* gobble "x" */ } else { Base = 10; /* Assume 10 for now - see below */ Prefix = 8; /* Actual prefix says octal */ } } else { Base = Prefix = 10; } /* Because floating point numbers don't have octal prefixes (a number ** with a leading zero is decimal), we first have to read the number ** before converting it, so we can determine if it's a float or an ** integer. */ while (IsXDigit (CurC) && HexVal (CurC) < Base) { SB_AppendChar (&S, CurC); NextChar (); } SB_Terminate (&S); /* The following character tells us if we have an integer or floating ** point constant. Note: Hexadecimal floating point constants aren't ** supported in C89. */ IsFloat = (CurC == '.' || (Base == 10 && toupper (CurC) == 'E') || (Base == 16 && toupper (CurC) == 'P' && IS_Get (&Standard) >= STD_C99)); /* If we don't have a floating point type, an octal prefix results in an ** octal base. */ if (!IsFloat && Prefix == 8) { Base = 8; } /* Since we do now know the correct base, convert the remembered input ** into a number. */ SB_Reset (&S); IVal = 0; while ((C = SB_Get (&S)) != '\0') { DigitVal = HexVal (C); if (DigitVal >= Base) { Error ("Numeric constant contains digits beyond the radix"); } IVal = (IVal * Base) + DigitVal; } /* We don't need the string buffer any longer */ SB_Done (&S); /* Distinguish between integer and floating point constants */ if (!IsFloat) { unsigned Types; int HaveSuffix; /* Check for a suffix and determine the possible types */ HaveSuffix = 1; if (toupper (CurC) == 'U') { /* Unsigned type */ NextChar (); if (toupper (CurC) != 'L') { Types = IT_UINT | IT_ULONG; } else { NextChar (); Types = IT_ULONG; } } else if (toupper (CurC) == 'L') { /* Long type */ NextChar (); if (toupper (CurC) != 'U') { Types = IT_LONG | IT_ULONG; } else { NextChar (); Types = IT_ULONG; } } else { HaveSuffix = 0; if (Prefix == 10) { /* Decimal constants are of any type but uint */ Types = IT_INT | IT_LONG | IT_ULONG; } else { /* Octal or hex constants are of any type */ Types = IT_INT | IT_UINT | IT_LONG | IT_ULONG; } } /* Check the range to determine the type */ if (IVal > 0x7FFF) { /* Out of range for int */ Types &= ~IT_INT; /* If the value is in the range 0x8000..0xFFFF, unsigned int is not ** allowed, and we don't have a type specifying suffix, emit a ** warning, because the constant is of type long. */ if (IVal <= 0xFFFF && (Types & IT_UINT) == 0 && !HaveSuffix) { Warning ("Constant is long"); } } if (IVal > 0xFFFF) { /* Out of range for unsigned int */ Types &= ~IT_UINT; } if (IVal > 0x7FFFFFFF) { /* Out of range for long int */ Types &= ~IT_LONG; } /* Now set the type string to the smallest type in types */ if (Types & IT_INT) { NextTok.Type = type_int; } else if (Types & IT_UINT) { NextTok.Type = type_uint; } else if (Types & IT_LONG) { NextTok.Type = type_long; } else { NextTok.Type = type_ulong; } /* Set the value and the token */ NextTok.IVal = IVal; NextTok.Tok = TOK_ICONST; } else { /* Float constant */ Double FVal = FP_D_FromInt (IVal); /* Convert to double */ /* Check for a fractional part and read it */ if (CurC == '.') { Double Scale; /* Skip the dot */ NextChar (); /* Read fractional digits */ Scale = FP_D_Make (1.0); while (IsXDigit (CurC) && (DigitVal = HexVal (CurC)) < Base) { /* Get the value of this digit */ Double FracVal = FP_D_Div (FP_D_FromInt (DigitVal * Base), Scale); /* Add it to the float value */ FVal = FP_D_Add (FVal, FracVal); /* Scale base */ Scale = FP_D_Mul (Scale, FP_D_FromInt (DigitVal)); /* Skip the digit */ NextChar (); } } /* Check for an exponent and read it */ if ((Base == 16 && toupper (CurC) == 'F') || (Base == 10 && toupper (CurC) == 'E')) { unsigned Digits; unsigned Exp; /* Skip the exponent notifier */ NextChar (); /* Read an optional sign */ if (CurC == '-') { NextChar (); } else if (CurC == '+') { NextChar (); } /* Read exponent digits. Since we support only 32 bit floats ** with a maximum exponent of +-/127, we read the exponent ** part as integer with up to 3 digits and drop the remainder. ** This avoids an overflow of Exp. The exponent is always ** decimal, even for hex float consts. */ Digits = 0; Exp = 0; while (IsDigit (CurC)) { if (++Digits <= 3) { Exp = Exp * 10 + HexVal (CurC); } NextChar (); } /* Check for errors: We must have exponent digits, and not more ** than three. */ if (Digits == 0) { Error ("Floating constant exponent has no digits"); } else if (Digits > 3) { Warning ("Floating constant exponent is too large"); } /* Scale the exponent and adjust the value accordingly */ if (Exp) { FVal = FP_D_Mul (FVal, FP_D_Make (pow (10, Exp))); } } /* Check for a suffix and determine the type of the constant */ if (toupper (CurC) == 'F') { NextChar (); NextTok.Type = type_float; } else { NextTok.Type = type_double; } /* Set the value and the token */ NextTok.FVal = FVal; NextTok.Tok = TOK_FCONST; } }
static void ParsePragma (void) /* Parse the contents of the _Pragma statement */ { pragma_t Pragma; StrBuf Ident = AUTO_STRBUF_INITIALIZER; /* Create a string buffer from the string literal */ StrBuf B = AUTO_STRBUF_INITIALIZER; SB_Append (&B, GetLiteralStrBuf (CurTok.SVal)); /* Skip the string token */ NextToken (); /* Get the pragma name from the string */ SB_SkipWhite (&B); if (!SB_GetSym (&B, &Ident, "-")) { Error ("Invalid pragma"); goto ExitPoint; } /* Search for the name */ Pragma = FindPragma (&Ident); /* Do we know this pragma? */ if (Pragma == PRAGMA_ILLEGAL) { /* According to the ANSI standard, we're not allowed to generate errors * for unknown pragmas, but warn about them if enabled (the default). */ if (IS_Get (&WarnUnknownPragma)) { Warning ("Unknown pragma `%s'", SB_GetConstBuf (&Ident)); } goto ExitPoint; } /* Check for an open paren */ SB_SkipWhite (&B); if (SB_Get (&B) != '(') { Error ("'(' expected"); goto ExitPoint; } /* Skip white space before the argument */ SB_SkipWhite (&B); /* Switch for the different pragmas */ switch (Pragma) { case PRAGMA_ALIGN: IntPragma (&B, &DataAlignment, 1, 4096); break; case PRAGMA_BSSSEG: Warning ("#pragma bssseg is obsolete, please use #pragma bss-name instead"); /* FALLTHROUGH */ case PRAGMA_BSS_NAME: SegNamePragma (&B, SEG_BSS); break; case PRAGMA_CHARMAP: CharMapPragma (&B); break; case PRAGMA_CHECKSTACK: Warning ("#pragma checkstack is obsolete, please use #pragma check-stack instead"); /* FALLTHROUGH */ case PRAGMA_CHECK_STACK: FlagPragma (&B, &CheckStack); break; case PRAGMA_CODESEG: Warning ("#pragma codeseg is obsolete, please use #pragma code-name instead"); /* FALLTHROUGH */ case PRAGMA_CODE_NAME: SegNamePragma (&B, SEG_CODE); break; case PRAGMA_CODESIZE: IntPragma (&B, &CodeSizeFactor, 10, 1000); break; case PRAGMA_DATASEG: Warning ("#pragma dataseg is obsolete, please use #pragma data-name instead"); /* FALLTHROUGH */ case PRAGMA_DATA_NAME: SegNamePragma (&B, SEG_DATA); break; case PRAGMA_LOCAL_STRINGS: FlagPragma (&B, &LocalStrings); break; case PRAGMA_OPTIMIZE: FlagPragma (&B, &Optimize); break; case PRAGMA_REGVARADDR: FlagPragma (&B, &AllowRegVarAddr); break; case PRAGMA_REGVARS: Warning ("#pragma regvars is obsolete, please use #pragma register-vars instead"); /* FALLTHROUGH */ case PRAGMA_REGISTER_VARS: FlagPragma (&B, &EnableRegVars); break; case PRAGMA_RODATASEG: Warning ("#pragma rodataseg is obsolete, please use #pragma rodata-name instead"); /* FALLTHROUGH */ case PRAGMA_RODATA_NAME: SegNamePragma (&B, SEG_RODATA); break; case PRAGMA_SIGNEDCHARS: Warning ("#pragma signedchars is obsolete, please use #pragma signed-chars instead"); /* FALLTHROUGH */ case PRAGMA_SIGNED_CHARS: FlagPragma (&B, &SignedChars); break; case PRAGMA_STATICLOCALS: Warning ("#pragma staticlocals is obsolete, please use #pragma static-locals instead"); /* FALLTHROUGH */ case PRAGMA_STATIC_LOCALS: FlagPragma (&B, &StaticLocals); break; case PRAGMA_WARN: WarnPragma (&B); break; case PRAGMA_WRITABLE_STRINGS: FlagPragma (&B, &WritableStrings); break; case PRAGMA_ZPSYM: StringPragma (&B, MakeZPSym); break; default: Internal ("Invalid pragma"); } /* Closing paren expected */ SB_SkipWhite (&B); if (SB_Get (&B) != ')') { Error ("')' expected"); goto ExitPoint; } SB_SkipWhite (&B); /* Allow an optional semicolon to be compatible with the old syntax */ if (SB_Peek (&B) == ';') { SB_Skip (&B); SB_SkipWhite (&B); } /* Make sure nothing follows */ if (SB_Peek (&B) != '\0') { Error ("Unexpected input following pragma directive"); } ExitPoint: /* Release the string buffers */ SB_Done (&B); SB_Done (&Ident); }
static int ParseChar (StrBuf* B) /* Parse a character. Converts \n into EOL, etc. */ { unsigned I; unsigned Val; int C; /* Check for escape chars */ if ((C = SB_Get (B)) == '\\') { switch (SB_Peek (B)) { case '?': C = '?'; SB_Skip (B); break; case 'a': C = '\a'; SB_Skip (B); break; case 'b': C = '\b'; SB_Skip (B); break; case 'f': C = '\f'; SB_Skip (B); break; case 'r': C = '\r'; SB_Skip (B); break; case 'n': C = '\n'; SB_Skip (B); break; case 't': C = '\t'; SB_Skip (B); break; case 'v': C = '\v'; SB_Skip (B); break; case '\"': C = '\"'; SB_Skip (B); break; case '\'': C = '\''; SB_Skip (B); break; case '\\': C = '\\'; SB_Skip (B); break; case 'x': case 'X': /* Hex character constant */ SB_Skip (B); C = HexVal (SB_Get (B)) << 4; C |= HexVal (SB_Get (B)); break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': /* Octal constant */ I = 0; Val = SB_Get (B) - '0'; while (SB_Peek (B) >= '0' && SB_Peek (B) <= '7' && ++I <= 3) { Val = (Val << 3) | (SB_Get (B) - '0'); } C = (int) Val; if (Val > 256) { Error ("Character constant out of range"); C = ' '; } break; default: Error ("Illegal character constant 0x%02X", SB_Get (B)); C = ' '; break; } } /* Return the character */ return C; }