kopia lustrzana https://github.com/F5OEO/tstools
306 wiersze
7.9 KiB
C
306 wiersze
7.9 KiB
C
/*
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* Support for printing out to stdout/stderr/elsewhere -- functions to use
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* instead of printf, etc.
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the MPEG TS, PS and ES tools.
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*
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* The Initial Developer of the Original Code is Amino Communications Ltd.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Amino Communications Ltd, Swavesey, Cambridge UK
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*
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* ***** END LICENSE BLOCK *****
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include "compat.h"
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#include "printing_fns.h"
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#define DEBUG 0
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// ============================================================
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// Default printing functions
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// ============================================================
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static void print_message_to_stdout(const char *message)
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{
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#if DEBUG
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fputs("1>>",stdout);
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#endif
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(void) fputs(message,stdout);
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}
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static void print_message_to_stderr(const char *message)
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{
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#if DEBUG
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fputs("2>>",stderr);
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#endif
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(void) fputs(message,stderr);
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}
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static void fprint_message_to_stdout(const char *format, va_list arg_ptr)
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{
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#if DEBUG
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fputs("3>>",stdout);
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#endif
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(void) vfprintf(stdout, format, arg_ptr);
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}
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static void fprint_message_to_stderr(const char *format, va_list arg_ptr)
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{
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#if DEBUG
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fputs("4>>",stderr);
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#endif
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(void) vfprintf(stderr, format, arg_ptr);
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}
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static void flush_stdout(void)
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{
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(void) fflush(stdout);
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}
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// ============================================================
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// Print redirection defaults to all output going to stdout
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// ============================================================
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struct print_fns
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{
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void (*print_message_fn) (const char *message);
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void (*print_error_fn) (const char *message);
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void (*fprint_message_fn) (const char *format, va_list arg_ptr);
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void (*fprint_error_fn) (const char *format, va_list arg_ptr);
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void (*flush_message_fn) (void);
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};
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static struct print_fns fns = { print_message_to_stdout,
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print_message_to_stdout,
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fprint_message_to_stdout,
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fprint_message_to_stdout,
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flush_stdout };
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#if DEBUG
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static void report_fns(const char *why)
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{
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printf("Printing bound to (%s) m:%p, e:%p, fm:%p, fe:%p\n",why,
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fns.print_message_fn,
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fns.print_error_fn,
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fns.fprint_message_fn,
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fns.fprint_error_fn);
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}
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#endif
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// ============================================================
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// Functions for printing
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// ============================================================
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/*
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* Prints the given string, as a normal message.
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*/
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extern void print_msg(const char *text)
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{
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#if DEBUG
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printf("m:%p %s",fns.print_message_fn,text);
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report_fns("m");
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#endif
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fns.print_message_fn(text);
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}
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/*
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* Prints the given string, as an error message.
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*/
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extern void print_err(const char *text)
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{
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#if DEBUG
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printf("e:%p %s",fns.print_error_fn,text);
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report_fns("e");
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#endif
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fns.print_error_fn(text);
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}
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/*
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* Prints the given format text, as a normal message.
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*/
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extern void fprint_msg(const char *format, ...)
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{
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va_list va_arg;
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va_start(va_arg, format);
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#if DEBUG
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printf("fm:%p %s",fns.fprint_message_fn,format);
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report_fns("fm");
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#endif
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fns.fprint_message_fn(format, va_arg);
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va_end(va_arg);
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}
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/*
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* Prints the given formatted text, as an error message.
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*/
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extern void fprint_err(const char *format, ...)
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{
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va_list va_arg;
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va_start(va_arg, format);
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#if DEBUG
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printf("fe:%p %s",fns.fprint_error_fn,format);
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report_fns("fe");
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#endif
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fns.fprint_error_fn(format, va_arg);
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va_end(va_arg);
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}
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/*
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* Prints the given formatted text, as a normal or error message.
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* If `is_msg`, then as a normal message, else as an error
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*/
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extern void fprint_msg_or_err(int is_msg, const char *format, ...)
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{
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va_list va_arg;
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va_start(va_arg, format);
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if (is_msg)
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{
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#if DEBUG
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printf("?m:%p %s",fns.fprint_message_fn,format);
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report_fns("?m");
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#endif
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fns.fprint_message_fn(format, va_arg);
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}
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else
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{
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#if DEBUG
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printf("?e:%p %s",fns.fprint_error_fn,format);
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report_fns("?e");
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#endif
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fns.fprint_error_fn(format, va_arg);
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}
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va_end(va_arg);
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}
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/*
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* Prints the given string, as a normal message.
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*/
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extern void flush_msg(void)
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{
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fns.flush_message_fn();
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}
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// ============================================================
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// Choosing what the printing functions do
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// ============================================================
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/*
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* Calling this causes errors to go to stderr, and all other output
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* to go to stdout. This is the "traditional" mechanism used by
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* Unices.
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*/
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extern void redirect_output_stderr(void)
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{
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fns.print_message_fn = &print_message_to_stdout;
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fns.print_error_fn = &print_message_to_stderr;
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fns.fprint_message_fn = &fprint_message_to_stdout;
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fns.fprint_error_fn = &fprint_message_to_stderr;
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fns.flush_message_fn = &flush_stdout;
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#if DEBUG
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report_fns("traditional");
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#endif
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}
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/*
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* Calling this causes all output to go to stdout. This is simpler,
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* and is likely to be more use to most users.
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*
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* This is the default state.
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*/
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extern void redirect_output_stdout(void)
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{
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fns.print_message_fn = &print_message_to_stdout;
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fns.print_error_fn = &print_message_to_stdout;
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fns.fprint_message_fn = &fprint_message_to_stdout;
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fns.fprint_error_fn = &fprint_message_to_stdout;
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fns.flush_message_fn = &flush_stdout;
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#if DEBUG
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report_fns("stdout");
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#endif
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}
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/*
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* This allows the user to specify a set of functions to use for
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* formatted printing and non-formatted printing of errors and
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* other messages.
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*
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* It is up to the caller to ensure that all of the functions
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* make sense. All four functions must be specified.
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*
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* * `new_print_message_fn` takes a string and prints it out to the "normal"
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* output stream.
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* * `new_print_error_fn` takes a string and prints it out to the error output
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* stream.
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* * `new_fprint_message_fn` takes a printf-style format string and the
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* appropriate arguments, and writes the result out to the "normal" output.
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* * `new_fprint_error_fn` takes a printf-style format string and the
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* appropriate arguments, and writes the result out to the "error" output.
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* * `new_flush_msg_fn` flushes the "normal" message output.
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*
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* Returns 0 if all goes well, 1 if something goes wrong.
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*/
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extern int redirect_output( void (*new_print_message_fn) (const char *message),
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void (*new_print_error_fn) (const char *message),
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void (*new_fprint_message_fn) (const char *format, va_list arg_ptr),
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void (*new_fprint_error_fn) (const char *format, va_list arg_ptr),
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void (*new_flush_msg_fn) (void)
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)
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{
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if (new_print_message_fn == NULL || new_print_error_fn == NULL ||
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new_fprint_message_fn == NULL || new_fprint_error_fn == NULL ||
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new_flush_msg_fn == NULL)
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return 1;
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fns.print_message_fn = new_print_message_fn;
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fns.print_error_fn = new_print_error_fn;
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fns.fprint_message_fn = new_fprint_message_fn;
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fns.fprint_error_fn = new_fprint_error_fn;
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fns.flush_message_fn = new_flush_msg_fn;
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#if DEBUG
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report_fns("specific");
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#endif
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return 0;
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}
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extern void test_C_printing(void)
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{
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print_msg("C Message\n");
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print_err("C Error\n");
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fprint_msg("C Message %s\n","Fred");
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fprint_err("C Error %s\n","Fred");
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}
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// Local Variables:
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// tab-width: 8
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// indent-tabs-mode: nil
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// c-basic-offset: 2
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// End:
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// vim: set tabstop=8 shiftwidth=2 expandtab:
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