mirror of
https://github.com/byteworksinc/ORCA-C.git
synced 2024-06-25 16:29:56 +00:00
d3aff49550
Error messages are now lined up to account for the actual printed length of any escape sequences.
953 lines
26 KiB
ObjectPascal
953 lines
26 KiB
ObjectPascal
{$optimize 7}
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{---------------------------------------------------------------}
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{ }
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{ Printf }
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{ }
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{ Analyzes printf/scanf format and arguments to check for }
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{ potential problems. }
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{ Called from FunctionParms (Expression.pas) }
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{ Enabled via #pragma lint 16 }
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{---------------------------------------------------------------}
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unit Printf;
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interface
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{$LibPrefix '0/obj/'}
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uses CCommon, Scanner;
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{$segment 'PRINTF'}
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type
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fmtArgPtr = ^fmtArgRecord;
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fmtArgRecord = record
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next: fmtArgPtr;
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ty: typePtr;
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tk: tokenPtr;
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end;
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{
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format arg1: printf
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format arg2: fprintf, sprintf, asprintf, dprintf
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format arg3: snprintf
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format arg1: scanf
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format arg2: fscanf, sscanf
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}
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fmt_type = (fmt_none, fmt_printf1, fmt_printf2, fmt_printf3, fmt_scanf1, fmt_scanf2);
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function FormatClassify(fname: stringPtr): fmt_type;
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procedure FormatCheck(fmt: fmt_type; args: fmtArgPtr);
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implementation
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const
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feature_hh = true;
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feature_ll = false;
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feature_s_long = false;
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feature_n_size = true;
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type
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length_modifier = (default, h, hh, l, ll, j, z, t, ld);
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state_enum = (st_text, st_flag, st_width,
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st_precision_dot, st_precision, st_precision_number,
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st_length, st_length_h, st_length_l, st_format,
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{ scanf }
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st_suppress, st_set, st_set_1, st_set_2,
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st_error);
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types = set of baseTypeEnum;
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function KeyPress: boolean; extern; {in Scanner.asm}
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function FormatClassify {fname: stringPtr): fmt_type};
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{
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Check if a function name is printf/scanf. Caller must check if
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it otherwise matches (variadic, direct call)
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}
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var
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l: integer;
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begin {FormatClassify}
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FormatClassify := fmt_none;
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l := length(fname^);
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if (l >= 5) and (l <= 8) then case fname^[1] of
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'a': if fname^ = 'asprintf' then FormatClassify := fmt_printf2;
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'd': if fname^ = 'dprintf' then FormatClassify := fmt_printf2;
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'p': if fname^ = 'printf' then FormatClassify := fmt_printf1;
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'f':
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if fname^ = 'fprintf' then FormatClassify := fmt_printf2
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else if fname^ = 'fscanf' then FormatClassify := fmt_scanf2;
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's':
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if fname^ = 'scanf' then FormatClassify := fmt_scanf1
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else if fname^ = 'snprintf' then FormatClassify := fmt_printf3
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else if fname^ = 'sprintf' then FormatClassify := fmt_printf2
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else if fname^ = 'sscanf' then FormatClassify := fmt_scanf2;
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otherwise: ;
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end; {case}
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end; {FormatClassify}
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procedure FormatCheck{fmt: fmt_type; args: fmtArgPtr};
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var
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head: fmtArgPtr;
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s: longstringPtr;
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state: state_enum;
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has_length: length_modifier;
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error_count: integer;
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expected: integer;
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offset: integer;
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number_set : set of char;
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flag_set : set of char;
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length_set : set of char;
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format_set : set of char;
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procedure Warning(msg: stringPtr);
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{
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Pretty Print a warning.
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offset is the location of the current % character within s.
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}
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var
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i: integer;
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ch: char;
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begin {Warning}
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if error_count = 0 then begin
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WriteLine;
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Error(124);
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WriteLine;
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if s <> nil then begin
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Write(' > "');
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for i := 1 to s^.length do begin
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ch := s^.str[i];
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if ch in [' '..'~'] then begin
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if ch in ['"','\','?'] then
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write('\');
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write(ch);
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end {if}
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else
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case ord(ch) of
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7: write('\a');
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8: write('\b');
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9: write('\t');
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10: write('\n');
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11: write('\v');
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12: write('\f');
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13: write('\r');
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otherwise: begin
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write('\');
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write((ord(ch)>>6):1);
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write(((ord(ch)>>3) & $0007):1);
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write((ord(ch) & $0007):1);
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end;
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end; {case}
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end; {for}
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WriteLn('"');
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end; {if}
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end; {if}
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error_count := error_count + 1;
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Write(' ');
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if offset = 0 then
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if s <> nil then begin
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offset := s^.length;
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write(' ');
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end; {if}
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if offset > 0 then begin
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if s <> nil then begin
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if offset > s^.length then
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offset := s^.length;
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for i := 1 to offset do begin
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ch := s^.str[i];
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if ch in [' '..'~'] then begin
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if ch in ['"','\','?'] then
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write(' ');
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write(' ');
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end {if}
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else
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case ord(ch) of
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7,8,9,10,11,12,13: write(' ');
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otherwise: write(' ');
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end; {case}
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end; {for}
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end; {if}
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Write('^ ');
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end; {if}
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WriteLn(msg^);
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end; {Warning}
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procedure WarningConversionChar(c: char);
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{ Warn that a conversion character is invalid, eg %z }
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var
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msg: stringPtr;
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begin {WarningConversionChar}
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if (ord(c) >= $20) and (ord(c) <= $7f) then begin
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new(msg);
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msg^ := concat('unknown conversion type character ''', c, ''' in format');
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Warning(msg);
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dispose(msg);
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end {if}
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else Warning(@'unknown conversion type character in format');
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end; {WarningConversionChar}
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procedure WarningExtraArgs(i: integer);
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{ Warn that too many arguments were provided }
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var
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msg: stringPtr;
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begin {WarningExtraArgs}
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new(msg);
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msg^ := concat('extra argument(s) provided (', cnvis(i), ' expected)');
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Warning(msg);
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dispose(msg);
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end; {WarningExtraArgs}
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function popType: typePtr;
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{ Return the token type and advance the linked list. }
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begin {popType}
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expected := expected + 1;
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popType := nil;
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if args <> nil then begin
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popType := args^.ty;
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args := args^.next;
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end; {if}
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end; {popType}
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procedure expect_long;
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{ Verify the current argument is a long int.}
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var
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ty: typePtr;
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begin {expect_long}
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ty := popType;
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if ty <> nil then begin
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if (ty^.kind <> scalarType) or (not (ty^.baseType in [cgLong, cgULong])) then begin
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Warning(@'expected long int');
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end; {if}
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end {if}
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else begin
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Warning(@'argument missing; expected long int');
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end; {else}
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end; {expect_long}
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procedure expect_int;
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var
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ty: typePtr;
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begin {expect_int}
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ty := popType;
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if ty <> nil then begin
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if (ty^.kind <> scalarType) or
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not (ty^.baseType in [cgWord, cgUWord, cgByte, cgUByte]) then begin
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Warning(@'expected int');
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end; {if}
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end {if}
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else begin
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Warning(@'argument missing; expected int');
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end; {else}
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end; {expect_int}
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procedure expect_char;
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var
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ty: typePtr;
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begin {expect_char}
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ty := popType;
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if ty <> nil then begin
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if (ty^.kind <> scalarType) or
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not (ty^.baseType in [cgWord, cgUWord, cgByte, cgUByte]) then begin
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Warning(@'expected char');
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end; {if}
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end {if}
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else begin
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Warning(@'argument missing; expected char');
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end; {else}
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end; {expect_char}
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procedure expect_extended;
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{ Verify the current argument is an extended*. }
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{ * or float or double or comp since they're all passed as extended }
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var
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ty: typePtr;
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begin {expect_extended}
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ty := popType;
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if ty <> nil then begin
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if (ty^.kind <> scalarType) or
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not (ty^.baseType in [cgExtended, cgReal, cgDouble, cgComp]) then begin
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Warning(@'expected a floating-point value');
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end; {if}
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end {if}
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else begin
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Warning(@'argument missing; expected a floating-point value');
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end; {else}
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end; {expect_extended}
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procedure expect_pointer;
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{ Verify the current argument is a pointer of some sort. }
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var
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ty: typePtr;
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begin {expect_pointer}
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ty := popType;
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if ty <> nil then begin
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if (ty^.kind <> pointerType) then begin
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Warning(@'expected pointer');
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end; {if}
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end {if}
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else begin
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Warning(@'argument missing; expected pointer');
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end; {else}
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end; {expect_pointer}
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procedure expect_pointer_to(expected: types; name: stringPtr);
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{ Verify the current argument is a pointer to the expected set.}
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var
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ty: typePtr;
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baseTy: typePtr;
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ok: boolean;
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procedure error(prefix: stringPtr);
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var
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msg: stringPtr;
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begin
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new(msg);
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msg^ := concat(prefix^, name^);
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Warning(msg);
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dispose(msg);
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end; {error}
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begin {expect_pointer_to}
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ok := false;
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ty := popType;
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baseTy := nil;
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if ty <> nil then
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if (ty^.kind = pointerType) or (ty^.kind = arrayType) then begin
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baseTy := ty^.pType;
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if (baseTy <> nil)
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and (baseTy^.kind = scalarType)
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and (baseTy^.baseType in expected)
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then ok := true;
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end; {if}
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if not ok then begin
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if ty = nil then
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error(@'argument missing; expected pointer to ')
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else error(@'expected pointer to ');
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end; {if}
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end; {expect_pointer_to}
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procedure do_length(c: char);
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{ helper to process the length modifier }
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begin {do_length}
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state := st_format;
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case c of
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'h': begin
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has_length := h;
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state := st_length_h;
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end;
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'l': begin
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has_length := l;
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state := st_length_l;
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end;
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'j': has_length := j;
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'z': has_length := z;
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't': has_length := t;
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'L': has_length := ld;
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end; {case}
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end; {do_length}
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procedure FormatScanf;
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{ Check the scanf string and arguments. }
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label 1;
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var
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i: integer;
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c: char;
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has_suppress: boolean;
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procedure do_scanf_format;
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{ check an individual scanf argument. }
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{
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(current) ORCALib limitations, wrt size modifiers:
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- ignored for string types
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- hh not supported
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- L not supported
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- ignored for 'n'
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}
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var
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expected: types;
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name: stringPtr;
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begin {do_scanf_format}
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name := nil;
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state := st_text;
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if c in format_set then begin
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case c of
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'%': begin
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if has_suppress or (has_length <> default) then
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Warning(@'invalid element in %% conversion specification');
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has_suppress := true;
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end;
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'b': begin
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if has_length <> default then
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Warning(@'length modifier may not be used with %b');
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expected := [cgByte, cgUByte];
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name := @'char';
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end;
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'c', 's', '[' : begin
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{ %ls, etc is a wchar_t *}
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expected := [cgByte, cgUByte];
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name := @'char';
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if has_length = l then begin
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expected := [cgWord, cgUWord];
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name := @'wchar_t';
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if not feature_s_long then
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Warning(@'%ls, %lc, or %l[ is not currently supported');
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end {if}
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else if has_length <> default then
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Warning(@'invalid length modifier');
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if c = '[' then state := st_set_1;
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end;
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'd', 'i', 'u', 'o', 'x', 'X': begin
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case has_length of
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hh: begin
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expected := [cgByte, cgUByte];
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name := @'char';
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end;
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l, ll, j, z, t: begin
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expected := [cgLong, cgULong];
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name := @'long';
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end;
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h: begin
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expected := [cgWord, cgUWord];
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name := @'short';
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end;
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default: begin
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expected := [cgWord, cgUWord];
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name := @'int';
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end;
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otherwise: begin
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Warning(@'invalid length modifier');
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expected := [cgWord, cgUWord];
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name := @'int';
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end;
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end; {case}
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end;
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'n': begin
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{ n.b. - *n is undefined; orcalib pops a parm but doesn't store.}
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{ C99 - support for length modifiers }
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if has_suppress then Warning(@'behavior of %*n is undefined');
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has_suppress := false;
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if (not feature_n_size) and (has_length <> default) then
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Warning(@'size modifier for %n is not currently supported');
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case has_length of
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hh: begin
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expected := [cgByte, cgUByte];
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name := @'char';
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end;
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l, ll, j, z, t: begin
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expected := [cgLong, cgULong];
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name := @'long';
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end;
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h: begin
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expected := [cgWord, cgUWord];
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name := @'short';
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end;
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default: begin
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expected := [cgWord, cgUWord];
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name := @'int';
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end;
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otherwise: begin
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Warning(@'invalid length modifier');
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expected := [cgWord, cgUWord];
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name := @'int';
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end;
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end; {case}
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end;
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'p': begin
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if has_length <> default then
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Warning(@'length modifier may not be used with %p');
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if not has_suppress then expect_pointer;
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has_suppress := true;
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end;
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'a', 'A', 'f', 'F', 'g', 'G', 'e', 'E': begin
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case has_length of
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ld: begin
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expected := [cgExtended];
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name := @'long double';
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end;
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l: begin
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expected := [cgDouble];
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name := @'double';
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end;
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default: begin
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expected := [cgReal];
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name := @'float';
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end;
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otherwise: begin
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Warning(@'invalid length modifier');
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expected := [cgReal];
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name := @'float';
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end;
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end; {case}
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end;
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end; { case }
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if not has_suppress then begin
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expect_pointer_to(expected, name);
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end; {if}
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end {if}
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else WarningConversionChar(c);
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end; {do_scanf_format}
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begin {FormatScanf}
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{
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'%'
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'*'? - assignment suppression
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\d* - maximum field width
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(h|hh|l|ll|j|z|t|L)? - length modifier
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[%bcsdiuoxXnaAeEfFgGp] | set - format
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set: '[[' [^]]* ']'
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set: '[^[' [^]]* ']'
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set: '[' [^]]+ ']'
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}
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state := st_text;
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expected := 0;
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offset := 0;
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number_set := ['0' .. '9'];
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length_set := ['h', 'l', 'j', 't', 'z', 'L'];
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flag_set := ['#', '0', '-', '+', ' '];
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format_set := ['%', '[', 'b', 'c', 's', 'd', 'i', 'o', 'x', 'X', 'u',
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'f', 'F', 'e', 'E', 'a', 'A', 'g', 'G', 'n', 'p'];
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for i := 1 to s^.length do begin
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c := s^.str[i];
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case state of
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st_text: if c = '%' then begin
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state := st_suppress;
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offset := i;
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has_length := default;
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has_suppress := false;
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end; {if}
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st_suppress: { suppress? width? length? format }
|
|
if c = '*' then begin
|
|
state := st_width;
|
|
has_suppress := true;
|
|
end {if}
|
|
else if c in number_set then state := st_width
|
|
else if c in length_set then do_length(c)
|
|
else do_scanf_format;
|
|
|
|
st_width: {width? length? format }
|
|
if c in number_set then state := st_width
|
|
else if c in length_set then do_length(c)
|
|
else do_scanf_format;
|
|
|
|
st_length_h: { h? format }
|
|
if c = 'h' then begin
|
|
has_length := hh;
|
|
state := st_format;
|
|
if not feature_hh then
|
|
Warning(@'hh modifier is not currently supported');
|
|
end {if}
|
|
else do_scanf_format;
|
|
|
|
st_length_l: { l? format }
|
|
if c = 'l' then begin
|
|
has_length := ll;
|
|
state := st_format;
|
|
if not feature_ll then
|
|
Warning(@'ll modifier is not currently supported');
|
|
end {if}
|
|
else do_scanf_format;
|
|
|
|
st_format: { format }
|
|
do_scanf_format;
|
|
|
|
{ first char of a [set]. ']' does not end the set. }
|
|
st_set_1:
|
|
if c = '^' then state := st_set_2
|
|
else state := st_set;
|
|
|
|
st_set_2:
|
|
state := st_set;
|
|
|
|
st_set:
|
|
if c = ']' then state := st_text;
|
|
|
|
st_error: goto 1;
|
|
end; { case }
|
|
end; { for }
|
|
|
|
if state <> st_text then
|
|
Warning(@'incomplete format specifier');
|
|
|
|
if args <> nil then begin
|
|
offset := 0;
|
|
WarningExtraArgs(expected);
|
|
end;
|
|
|
|
1:
|
|
|
|
end; {FormatScanf}
|
|
|
|
|
|
|
|
procedure FormatPrintf;
|
|
{ Check the printf string and arguments. }
|
|
|
|
label 1;
|
|
|
|
var
|
|
|
|
i : integer;
|
|
c : char;
|
|
|
|
has_flag : boolean;
|
|
has_width: boolean;
|
|
has_precision : boolean;
|
|
|
|
procedure do_printf_format;
|
|
{ check an individual printf argument. }
|
|
|
|
begin {do_printf_format}
|
|
state := st_text;
|
|
if c in format_set then begin
|
|
case c of
|
|
'p': begin
|
|
if has_length <> default then
|
|
Warning(@'length modifier may not be used with %p');
|
|
expect_pointer;
|
|
end;
|
|
|
|
{ %b: orca-specific - pascal string }
|
|
'b': begin
|
|
if has_length <> default then
|
|
Warning(@'length modifier may not be used with %b');
|
|
expect_pointer_to([cgByte, cgUByte], @'char');
|
|
end;
|
|
|
|
's':
|
|
if has_length = l then begin
|
|
if not feature_s_long then
|
|
Warning(@'%ls is not currently supported');
|
|
|
|
expect_pointer_to([cgWord, cgUWord], @'wchar_t')
|
|
end {if}
|
|
else begin
|
|
if has_length <> default then
|
|
Warning(@'invalid length modifier');
|
|
expect_pointer_to([cgByte, cgUByte], @'char');
|
|
end; {else}
|
|
|
|
'n': begin
|
|
|
|
if (not feature_n_size) and (has_length <> default) then
|
|
Warning(@'length modifier for %n is not currently supported');
|
|
|
|
case has_length of
|
|
hh:
|
|
expect_pointer_to([cgByte, cgUByte], @'char');
|
|
|
|
l, ll, j, z, t:
|
|
expect_pointer_to([cgLong, cgULong], @'long');
|
|
|
|
otherwise: begin
|
|
if feature_n_size and (has_length = ld) then
|
|
Warning(@'invalid length modifier');
|
|
expect_pointer_to([cgWord, cgUWord], @'int');
|
|
end;
|
|
end; {case}
|
|
|
|
end;
|
|
|
|
'c':
|
|
if has_length = l then begin
|
|
if not feature_s_long then
|
|
Warning(@'%lc is not currently supported');
|
|
expect_int;
|
|
end
|
|
else if has_length <> default then begin
|
|
Warning(@'invalid length modifier');
|
|
expect_char;
|
|
end
|
|
else begin
|
|
expect_char;
|
|
end;
|
|
|
|
{ chars are passed as ints so %hhx can be ignored here. }
|
|
'd', 'i', 'o', 'x', 'X', 'u':
|
|
if has_length in [l, ll, j, z, t] then begin
|
|
expect_long;
|
|
end
|
|
else if has_length = ld then begin
|
|
Warning(@'invalid length modifier');
|
|
expect_int;
|
|
end
|
|
else begin
|
|
expect_int;
|
|
end;
|
|
|
|
'f', 'F', 'e', 'E', 'a', 'A', 'g', 'G': begin
|
|
if not (has_length in [l, ld, default]) then
|
|
Warning(@'invalid length modifier');
|
|
expect_extended;
|
|
end;
|
|
|
|
'%':
|
|
if has_flag or has_width or has_precision
|
|
or (has_length <> default) then
|
|
Warning(@'invalid element in %% conversion specification');
|
|
end; {case}
|
|
end {if}
|
|
else WarningConversionChar(c);
|
|
|
|
|
|
end; {do_printf_format}
|
|
|
|
begin {FormatPrintf}
|
|
|
|
state := st_text;
|
|
expected := 0;
|
|
offset := 0;
|
|
|
|
number_set := ['0' .. '9'];
|
|
length_set := ['h', 'l', 'j', 't', 'z', 'L'];
|
|
flag_set := ['#', '0', '-', '+', ' '];
|
|
format_set := ['%', 'b', 'c', 's', 'd', 'i', 'o', 'x', 'X', 'u',
|
|
'f', 'F', 'e', 'E', 'a', 'A', 'g', 'G', 'n', 'p'];
|
|
|
|
for i := 1 to s^.length do begin
|
|
c := s^.str[i];
|
|
case state of
|
|
st_text:
|
|
if c = '%' then begin
|
|
state := st_flag;
|
|
offset := i;
|
|
has_length := default;
|
|
has_flag := false;
|
|
has_width := false;
|
|
has_precision := false;
|
|
end;
|
|
|
|
st_flag: { flags* width? precision? length? format }
|
|
if c in flag_set then begin
|
|
state := st_flag;
|
|
has_flag := true;
|
|
end
|
|
else if c in number_set then begin
|
|
state := st_width;
|
|
has_width := true;
|
|
end
|
|
else if c = '*' then begin
|
|
{ * for the width }
|
|
has_width := true;
|
|
expect_int;
|
|
state := st_precision;
|
|
end
|
|
else if c = '.' then state := st_precision_dot
|
|
else if c in length_set then do_length(c)
|
|
else do_printf_format;
|
|
|
|
st_width: { width? precision? length? format }
|
|
if c in number_set then state := st_width
|
|
else if c = '.' then state := st_precision_dot
|
|
else if c in length_set then do_length(c)
|
|
else do_printf_format;
|
|
|
|
st_precision: { (. precision)? length? format }
|
|
if c = '.' then state := st_precision_dot
|
|
else if c in length_set then do_length(c)
|
|
else do_printf_format;
|
|
|
|
|
|
st_precision_dot: begin { * | [0-9]+ }
|
|
has_precision := true;
|
|
if c = '*' then begin
|
|
expect_int;
|
|
state := st_length;
|
|
end
|
|
else if c in number_set then state := st_precision_number
|
|
else state := st_error;
|
|
end;
|
|
|
|
st_precision_number: { [0-9]* length? format }
|
|
if c in number_set then state := st_precision_number
|
|
else if c in length_set then do_length(c)
|
|
else do_printf_format;
|
|
|
|
st_length: { length? format }
|
|
if c in length_set then do_length(c)
|
|
else do_printf_format;
|
|
|
|
st_length_h: { h? format }
|
|
if c = 'h' then begin
|
|
has_length := hh;
|
|
state := st_format;
|
|
if not feature_hh then
|
|
Warning(@'hh modifier is not currently supported');
|
|
end
|
|
else do_printf_format;
|
|
|
|
st_length_l: { l? format}
|
|
if c = 'l' then begin
|
|
has_length := ll;
|
|
state := st_format;
|
|
if not feature_ll then
|
|
Warning(@'ll modifier is not currently supported');
|
|
end
|
|
else do_printf_format;
|
|
|
|
st_format: do_printf_format;
|
|
|
|
st_error: { error }
|
|
goto 1;
|
|
|
|
end; { case }
|
|
end; { for i }
|
|
|
|
if state <> st_text then
|
|
Warning(@'incomplete format specifier');
|
|
|
|
if args <> nil then begin
|
|
offset := 0;
|
|
WarningExtraArgs(expected);
|
|
end;
|
|
1:
|
|
|
|
end; {FormatPrintf}
|
|
|
|
|
|
|
|
|
|
|
|
function get_format_string(pos: integer): longstringPtr;
|
|
{ get the format string from the pos'th argument. }
|
|
var
|
|
tk: tokenPtr;
|
|
|
|
begin {get_format_string}
|
|
get_format_string := nil;
|
|
|
|
while (args <> nil) and (pos > 1) do begin
|
|
args := args^.next;
|
|
pos := pos - 1;
|
|
end; {while}
|
|
|
|
if (pos = 1) and (args <> nil) then begin
|
|
tk := args^.tk;
|
|
args := args^.next;
|
|
|
|
if (tk <> nil) and (tk^.token.kind = stringconst) then
|
|
get_format_string := tk^.token.sval
|
|
else
|
|
{Error(125) - disabled for now};
|
|
end; {if}
|
|
{ no format string -> Error(85) }
|
|
end; {get_format_string}
|
|
|
|
|
|
|
|
begin {FormatCheck}
|
|
|
|
head := args;
|
|
error_count := 0;
|
|
offset := 0;
|
|
|
|
case fmt of
|
|
fmt_printf1, fmt_scanf1:
|
|
s := get_format_string(1);
|
|
|
|
fmt_printf2, fmt_scanf2:
|
|
s := get_format_string(2);
|
|
|
|
fmt_printf3:
|
|
s := get_format_string(3);
|
|
|
|
otherwise: s := nil;
|
|
end; {case}
|
|
|
|
if (s <> nil) then case fmt of
|
|
fmt_printf1, fmt_printf2, fmt_printf3:
|
|
FormatPrintf;
|
|
|
|
fmt_scanf1, fmt_scanf2:
|
|
FormatScanf;
|
|
end; {case}
|
|
|
|
{ clean up linked list }
|
|
while head <> nil do begin
|
|
args := head^.next;
|
|
dispose(head);
|
|
head := args;
|
|
end;
|
|
|
|
{handle pauses}
|
|
if ((error_count <> 0) and wait) or KeyPress then begin
|
|
DrawHourglass;
|
|
while not KeyPress do {nothing};
|
|
ClearHourglass;
|
|
end; {if}
|
|
end; {FormatCheck}
|
|
|
|
end.
|