Avoid casts between pointers and integers (prog & runtime).

* src/prog.h (mf_stkval): New data type.
(STKVAL): Redefine as union mf_stkval.
(mft_ptr,mft_str,mft_int)
(mft_uint,mft_long,mft_ulong)
(mft_size,mft_string,mft_number): New data types.
(mf_cat,mf_c_val): New macros.
(instr_t): Moved from mailfromd.h
(mf_code_cell): New union
(mf_code_cell_t): New typedef.
(mf_cell_instr,mf_cell_value)
(mf_cell_c_value): New macros
(code_peek): Moved from mailfromd.h. Change return type;
(code_immediate,code_put): Moved from mailfromd.h. Change signature.
(code_op,code_instr,code_exmask)
(code_get_counter,dump_code,fixup_code): Moved from mailfromd.h.
(prog): Change type.
* src/prog.c: Use mf_c_val to extract C values from STKVAL.
(get_immediate): Return STKVAL.
(prog): Change type
(code_cell): New function.
(code_instr): Rewrite using code_cell
(code_immediate): Likewise. Change argument type.
(code_exmask): Use proper typecast.
(code_put): Change argument type.
(code_peek): Change return type.
(runtime_stack_trace): Use mf_cell_instr to access instruction
pointer.
* src/mailfromd.h (yyerror): Change signature.
(instr_t): Move to prog.h
(code_put,code_peek,code_reserve)
(code_immediate,code_op,code_instr)
(code_exmask,code_get_counter)
(dump_code,fixup_code): Move to prog.h
* src/exclist.c: Use mf_c_val
* src/gram.y (yyerror): Change signature.
(mailfromd_run): Use mf_c_val to extract actual value.

* doc/functions.texi (body_has_nulls): Fix return type.

* src/builtin/snarf.m4 (__mf_defun): Define __MF_RETTYPE__
(MF_RETURN): Take optional second argument (return type).
Decide what push function to use and what type to cast the
value to depending on its value and that of __MF_RETTYPE__.
(MF_RETURN_STRING): Remove.
(MF_RETURN_OBSTACK): Explicitly declare return type as STKVAL.
(MF_VAR_REF): Take two or three arguments (second one declaring
value type).
(MF_ALLOC_HEAP_TEMP):
(MF_VAR_STRING): Update.
(END): Popdef __MF_RETTYPE__.
* src/builtin/body.bi: Use MF_RETURN.
(body_has_nulls): Fix return type.
* src/builtin/burst.bi: Use MF_RETURN.
* src/builtin/callout.bi: Likewise.
* src/builtin/ctype.bi: Likewise.
* src/builtin/curhdr.bi: Likewise.
* src/builtin/db.bi: Likewise.
* src/builtin/debug.bi: Likewise.
* src/builtin/dns.bi: Likewise.
* src/builtin/email.bi: Likewise.
* src/builtin/geoip.bi: Likewise.
* src/builtin/getopt.bi: Likewise.
* src/builtin/gettext.bi: Likewise.
* src/builtin/io.bi: Likewise.
* src/builtin/ipaddr.bi: Likewise.
* src/builtin/macro.bi: Likewise.
* src/builtin/msg.bi: Likewise.
* src/builtin/sa.bi: Likewise.
* src/builtin/spf.bi: Likewise.
* src/builtin/string.bi: Likewise.
* src/builtin/system.bi: Likewise.
* src/builtin/vars.bi: Likewise.

* src/drivers.c: Use proper typecasts when calling code_* functions.
* src/optab.opc (scan_code): Use mf_cell_c_value to inspect
prog[].

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