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/*
* utils.c: miscellaneous utilities
*
* Copyright (c) 2013 - 2020, Přemysl Eric Janouch <p@janouch.name>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <glib.h>
#include <glib/gprintf.h>
#include <gio/gio.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include <curses.h>
#include <termios.h>
#ifndef TIOCGWINSZ
#include <sys/ioctl.h>
#endif // ! TIOCGWINSZ
#include "config.h"
#include "utils.h"
/// Trivially filter out all tags that aren't part of the Pango markup language,
/// or no frontend can quite handle--this seems to work well.
/// Given the nature of our display, also skip whole keyword elements.
gchar *
xdxf_to_pango_markup_with_reduced_effort (const gchar *xml)
{
GString *filtered = g_string_new ("");
while (*xml)
{
// GMarkup can read some of the wilder XML constructs, Pango skips them
const gchar *p = NULL;
if (*xml != '<' || xml[1] == '!' || xml[1] == '?'
|| g_ascii_isspace (xml[1]) || !*(p = xml + 1 + (xml[1] == '/'))
|| (strchr ("biu", *p) && p[1] == '>') || !(p = strchr (p, '>')))
g_string_append_c (filtered, *xml++);
else if (xml[1] != 'k' || xml[2] != '>' || !(xml = strstr (p, "</k>")))
xml = ++p;
}
return g_string_free (filtered, FALSE);
}
/// Read the whole stream into a byte array.
gboolean
stream_read_all (GByteArray *ba, GInputStream *is, GError **error)
{
guint8 buffer[1024 * 64];
gsize bytes_read;
while (g_input_stream_read_all (is, buffer, sizeof buffer,
&bytes_read, NULL, error))
{
g_byte_array_append (ba, buffer, bytes_read);
if (bytes_read < sizeof buffer)
return TRUE;
}
return FALSE;
}
/// Read a null-terminated string from a data input stream.
gchar *
stream_read_string (GDataInputStream *dis, GError **error)
{
gsize length;
gchar *s = g_data_input_stream_read_upto (dis, "", 1, &length, NULL, error);
if (!s)
return NULL;
GError *err = NULL;
g_data_input_stream_read_byte (dis, NULL, &err);
if (err)
{
g_free (s);
g_propagate_error (error, err);
return NULL;
}
return s;
}
gboolean
xstrtoul (unsigned long *out, const char *s, int base)
{
char *end;
errno = 0;
*out = strtoul (s, &end, base);
return errno == 0 && !*end && end != s;
}
// Didn't want to have this ugly piece of code in the main source file;
// the standard endwin/refresh sequence makes the terminal flicker.
void
update_curses_terminal_size (void)
{
#if defined (HAVE_RESIZETERM) && defined (TIOCGWINSZ)
struct winsize size;
if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size))
{
char *row = getenv ("LINES");
char *col = getenv ("COLUMNS");
unsigned long tmp;
resizeterm (
(row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row,
(col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col);
}
#else // HAVE_RESIZETERM && TIOCGWINSZ
endwin ();
refresh ();
#endif // HAVE_RESIZETERM && TIOCGWINSZ
}
/// Print a fatal error message and terminate the process immediately.
void
fatal (const gchar *format, ...)
{
va_list ap;
va_start (ap, format);
g_vfprintf (stderr, format, ap);
exit (EXIT_FAILURE);
va_end (ap);
}
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