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283 lines
7.0 KiB
C
283 lines
7.0 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "xp_mesg.h"
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#include "xp_mesgp.h"
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#include "xpassert.h"
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#include "xp_trace.h"
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#include <stddef.h>
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#include <stdarg.h>
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#ifdef DEBUG
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int DebugMessages = 1;
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#endif
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/*-----------------------------------------------------------------------------
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stdarg random access
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The stdarg interface requires you to access the argument in order and
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specifying the types. We thus build an array first so that when we later
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want random access to an argument, we know the types of all the ones
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before it.
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-----------------------------------------------------------------------------*/
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INLINE xpm_Integer
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integer_argument (xpm_Args * args, int arg)
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{
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va_list stack;
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xpm_Integer value;
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int i;
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#ifdef VA_START_UGLINESS
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stack = args->stack;
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#else
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va_start (stack, (*(args->start)));
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#endif
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#ifdef DEBUG
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XP_ASSERT (stack == args->stack);
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#endif
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for (i = 0; i <= arg; i++) {
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if (args->types[i] == matInteger)
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value = va_arg (stack, xpm_Integer);
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else
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va_arg (stack, char*);
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}
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va_end (stack);
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XP_LTRACE(DebugMessages,1,("message: integer %i is %i\n", arg, value));
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return value;
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}
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INLINE char *
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stack_string (xpm_Args * args, int arg)
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{
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va_list stack;
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char * value;
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int i;
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#ifdef VA_START_UGLINESS
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stack = args->stack;
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#else
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va_start (stack, (*(args->start)));
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#endif
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#ifdef DEBUG
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XP_ASSERT (stack == args->stack);
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#endif
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for (i = 0; i <= arg; i++) {
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if (args->types[i] == matInteger)
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va_arg (stack, xpm_Integer);
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else
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value = va_arg (stack, char*);
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}
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va_end (stack);
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XP_LTRACE(DebugMessages,1,("message: string %i is %s\n", arg, value));
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return value;
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}
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/*-----------------------------------------------------------------------------
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flow of control
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process_message runs through the format string (such as "open %1s with %2s"
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and sends normal characters through the "literal" output function and
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string and integer arguments though the "argument" function.
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-----------------------------------------------------------------------------*/
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static void
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process_message (const char * format, OutputStream * o)
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{
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const char * current = format;
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char c = *current;
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while (c) {
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if (c == '%') {
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c = *++current;
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XP_ASSERT (c);
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if (c == '%') {
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(o->writeLiteral) (o, '%');
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c = *++current;
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}
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else {
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int i = (c - '1');
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XP_ASSERT (0 <= i && i < MessageArgsMax);
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c = *++current;
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XP_ASSERT (c);
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(o->writeArgument) (o, c, i);
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c = *++current;
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}
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}
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else {
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(o->writeLiteral) (o, c);
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c = *++current;
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}
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}
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}
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/*-----------------------------------------------------------------------------
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ScanStream runs through the format string and builds the stdarg random
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access table.
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-----------------------------------------------------------------------------*/
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typedef struct ScanStream_ {
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OutputStream o;
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} ScanStream;
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static void
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xpm_scan_literal (OutputStream * o, char c)
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{
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ScanStream * s = (ScanStream *) o;
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}
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static void
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xpm_scan_argument (OutputStream * o, char c, int i)
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{
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ScanStream * s = (ScanStream *) o;
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if (c == 's') {
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s->o.args->sizes[i] = sizeof (char*);
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s->o.args->types[i] = matString;
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}
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else if (c == 'i') {
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s->o.args->sizes[i] = sizeof (xpm_Integer);
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s->o.args->types[i] = matInteger;
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}
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else
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XP_ABORT(("message: invalid specifier `%c'\n", c));
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}
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static void
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xpm_ScanStack (const char * format, xpm_Args * args)
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{
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ScanStream s;
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s.o.writeLiteral = & xpm_scan_literal;
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s.o.writeArgument = & xpm_scan_argument;
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s.o.args = args;
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process_message (format, & s.o);
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}
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/*-----------------------------------------------------------------------------
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CountStream counts the total number of characters in the message.
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-----------------------------------------------------------------------------*/
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typedef struct CountStream_ {
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OutputStream o;
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int total;
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} CountStream;
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static void
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xpm_count_literal (OutputStream * o, char c)
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{
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CountStream * s = (CountStream *) o;
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s->total ++;
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}
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static void
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xpm_count_argument (OutputStream * o, char c, int i)
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{
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CountStream * s = (CountStream *) o;
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if (c == 's') {
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char * value = stack_string (o->args, i);
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int len = value? strlen (value): 0;
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s->total += len;
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}
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else if (c == 'i') {
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s->total += 10;
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}
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}
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static int
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xpm_MessageLen (const char * format, xpm_Args * args)
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{
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CountStream s;
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s.o.writeLiteral = & xpm_count_literal;
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s.o.writeArgument = & xpm_count_argument;
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s.o.args = args;
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s.total = 0;
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xpm_ScanStack (format, args);
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process_message (format, & s.o);
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return s.total + 1 /* NULL */;
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}
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/*-----------------------------------------------------------------------------
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Public API
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These just build stdarg structures and call the internal functions.
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-----------------------------------------------------------------------------*/
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int
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XP_MessageLen (const char * format, ...)
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{
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xpm_Args args;
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int len;
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#ifdef VA_START_UGLINESS
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va_start (args.stack, format);
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#endif
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args.start = &format;
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len = xpm_MessageLen (format, &args);
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#ifdef VA_START_UGLINESS
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va_end (args.stack);
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#endif
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return len;
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}
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void
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XP_Message (char * buffer, int bufferLen, const char * format, ...)
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{
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/*
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This is a positional format string function. It's almost like
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sprintf, except that sprintf takes the format arguments in the
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order they are pushed on the stack. This won't work for
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il8n purposes. In other languages the arguments may have to be
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used in a different order. Therefore we need a format string
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which specifies the argument explicitly (say by number).
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sprintf fails us here:
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English: format = "open %1s with %2s"
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Japanese: format = "with %2s open %1s"
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printf (format, "foo.gif", "LView") ->
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English: "open foo.gif with LView"
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Japanese: "with foo.gif open LView" (wrong)
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XP_Message will work like this:
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English: format = "open %1s with %2s"
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Japanese: format = "with %2s open %1s"
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XP_Message (format, "foo.gif", "LView") ->
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English: "open foo.gif with LView"
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Japanese: "with LView open foo.gif" (arguments in correct positions)
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The syntax is: %NT, N = number of argument, T = type (only s and i
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supported). So %1s is the first argument as a string, %2i is the second
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argument as a number. No other printf modifiers (field widths, etc) are
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supported. It is legal to reference the same argument multiple times.
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%% outputs %.
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There is a maximum of 9 arguments.
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*/
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}
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const char *
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XP_StaticMessage (const char * format, ...)
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{
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return NULL;
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}
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