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/* signal.c: signal and miscellaneous routines for the ed line editor. */
/* GNU ed - The GNU line editor.
Copyright (C) 1993, 1994 Andrew Moore, Talke Studio
Copyright (C) 2006, 2007 Antonio Diaz Diaz.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "ed.h"
jmp_buf jmp_state;
static int mutex = 0; /* If set, signals stay pending */
static int _window_lines = 22; /* scroll length: ws_row - 2 */
static int _window_columns = 72;
static char sighup_pending = 0;
static char sigint_pending = 0;
void sighup_handler( int signum )
{
signum = 0; /* keep compiler happy */
if( mutex ) sighup_pending = 1;
else
{
char hb[] = "ed.hup";
char *hup = 0; /* hup filename */
char *s;
int n, m = 0;
sighup_pending = 0;
if( last_addr() && write_file( "ed.hup", "w", 1, last_addr(), 1 ) < 0 &&
( s = getenv( "HOME" ) ) != 0 &&
( !( n = strlen( s ) ) ||
( int )( n + ( m = *( s + n - 1 ) != '/' ) + sizeof( hb ) ) < path_max( 0 ) ) &&
( hup = ( char *) malloc( n + m + sizeof( hb ) ) ) != 0 )
{
memcpy( hup, s, n );
memcpy( hup + n, m ? "/" : "", 1 );
memcpy( hup + n + m, hb, sizeof( hb ) );
write_file( hup, "w", 1, last_addr(), 1 );
}
exit( 2 );
}
}
void sigint_handler( int signum )
{
if( mutex ) sigint_pending = 1;
else
{
sigset_t set;
sigint_pending = 0;
sigemptyset( &set );
sigaddset( &set, signum );
sigprocmask( SIG_UNBLOCK, &set, 0 );
longjmp( jmp_state, -1 );
}
}
void sigwinch_handler( int signum )
{
#ifdef TIOCGWINSZ
struct winsize ws; /* window size structure */
if( ioctl( 0, TIOCGWINSZ, (char *) &ws ) >= 0 )
{
/* Sanity check values of environment vars */
if( ws.ws_row > 2 && ws.ws_row < 600 ) _window_lines = ws.ws_row - 2;
if( ws.ws_col > 8 && ws.ws_col < 1800 ) _window_columns = ws.ws_col - 8;
}
#endif
signum = 0; /* keep compiler happy */
}
int set_signal( int signum, void (*handler )( int ) )
{
struct sigaction new_action;
new_action.sa_handler = handler;
sigemptyset( &new_action.sa_mask );
#ifdef SA_RESTART
new_action.sa_flags = SA_RESTART;
#else
new_action.sa_flags = 0;
#endif
return sigaction( signum, &new_action, 0 );
}
void enable_interrupts( void )
{
if( --mutex <= 0 )
{
mutex = 0;
if( sighup_pending ) sighup_handler( SIGHUP );
if( sigint_pending ) sigint_handler( SIGINT );
}
}
void disable_interrupts( void ) { ++mutex; }
void set_signals( void )
{
#ifdef SIGWINCH
sigwinch_handler( SIGWINCH );
if( isatty( 0 ) ) set_signal( SIGWINCH, sigwinch_handler );
#endif
set_signal( SIGHUP, sighup_handler );
set_signal( SIGQUIT, SIG_IGN );
set_signal( SIGINT, sigint_handler );
}
void set_window_lines( const int lines ) { _window_lines = lines; }
int window_columns( void ) { return _window_columns; }
int window_lines( void ) { return _window_lines; }
/* convert a string to int with out_of_range detection */
char parse_int( int *i, const char *str, const char **tail )
{
char *tmp;
errno = 0;
*i = strtol( str, &tmp, 10 );
if( tail ) *tail = tmp;
if( tmp == str )
{
set_error_msg( "Bad numerical result" );
*i = 0;
return 0;
}
if( errno == ERANGE )
{
set_error_msg( "Numerical result out of range" );
*i = 0;
return 0;
}
return 1;
}
/* assure at least a minimum size for buffer `buf' */
char resize_buffer( char **buf, int *size, int min_size )
{
if( *size < min_size )
{
const int new_size = ( min_size < 512 ? 512 : ( min_size / 512 ) * 1024 );
char *new_buf = 0;
disable_interrupts();
if( *buf ) new_buf = realloc( *buf, new_size );
else new_buf = malloc( new_size );
if( !new_buf )
{
show_strerror( 0, errno );
set_error_msg( "Memory exhausted" );
enable_interrupts();
return 0;
}
*size = new_size;
*buf = new_buf;
enable_interrupts();
}
return 1;
}
/* scan command buffer for next non-space char */
const char *skip_blanks( const char *s )
{
while( isspace( (unsigned char)*s ) && *s != '\n' ) ++s;
return s;
}
/* return copy of escaped string of at most length PATH_MAX */
const char *strip_escapes( const char *s )
{
static char *file = 0;
static int filesz = 0;
int i = 0;
if( !resize_buffer( &file, &filesz, path_max( 0 ) + 1 ) ) return 0;
/* assert: no trailing escape */
while( ( file[i++] = ( (*s == '\\' ) ? *++s : *s ) ) )
s++;
return file;
}
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