kopia lustrzana https://github.com/F5OEO/tstools
200 wiersze
5.9 KiB
C
200 wiersze
5.9 KiB
C
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/*
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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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// ============================================================
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// Default printing functions
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// ============================================================
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static int print_message_to_stdout(const char *message)
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{
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return (fputs(message,stdout) == 0 ? 0:1);
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}
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static int print_message_to_stderr(const char *message)
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{
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return (fputs(message,stderr) == 0 ? 0:1);
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}
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static int fprint_message_to_stdout(const char *format, va_list arg_ptr)
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{
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return (vfprintf(stdout, format, arg_ptr) < 0 ? 1:0);
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}
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static int fprint_message_to_stderr(const char *format, va_list arg_ptr)
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{
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return (vfprintf(stderr, format, arg_ptr) < 0 ? 1:0);
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}
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// ============================================================
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// Print redirection
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// ============================================================
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static int (*print_message_fn) (const char *message) = print_message_to_stdout;
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static int (*print_error_fn) (const char *message) = print_message_to_stdout;
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static int (*fprint_message_fn) (const char *format, va_list arg_ptr) = fprint_message_to_stdout;
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static int (*fprint_error_fn) (const char *format, va_list arg_ptr) = fprint_message_to_stdout;
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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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* Returns 0 if all goes well, 1 if something goes wrong.
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*/
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extern int print_msg(const char *text)
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{
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return 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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* Returns 0 if all goes well, 1 if something goes wrong.
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*/
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extern int print_err(const char *text)
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{
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return 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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* Returns 0 if all goes well, 1 if something goes wrong.
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*/
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extern int fprint_msg(const char *format, ...)
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{
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int retval;
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va_list va_arg;
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va_start(va_arg, format);
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retval = fprint_message_fn(format, va_arg);
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va_end(va_arg);
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return retval;
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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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* Returns 0 if all goes well, 1 if something goes wrong.
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*/
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extern int fprint_err(const char *format, ...)
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{
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int retval;
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va_list va_arg;
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va_start(va_arg, format);
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retval = fprint_error_fn(format, va_arg);
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va_end(va_arg);
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return retval;
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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_traditional(void)
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{
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print_message_fn = &print_message_to_stdout;
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print_error_fn = &print_message_to_stderr;
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fprint_message_fn = &fprint_message_to_stdout;
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fprint_error_fn = &fprint_message_to_stderr;
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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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print_message_fn = &print_message_to_stdout;
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print_error_fn = &print_message_to_stdout;
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fprint_message_fn = &fprint_message_to_stdout;
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fprint_error_fn = &fprint_message_to_stdout;
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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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*
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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( int (*new_print_message_fn) (const char *message),
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int (*new_print_error_fn) (const char *message),
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int (*new_fprint_message_fn) (const char *format, va_list arg_ptr),
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int (*new_fprint_error_fn) (const char *format, va_list arg_ptr)
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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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return 1;
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print_message_fn = new_print_message_fn;
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print_error_fn = new_print_error_fn;
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fprint_message_fn = new_fprint_message_fn;
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fprint_error_fn = new_fprint_error_fn;
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return 0;
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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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