rofi/source/helper.c

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/**
* rofi
*
* MIT/X11 License
* Copyright (c) 2012 Sean Pringle <sean.pringle@gmail.com>
* Modified 2013-2015 Qball Cow <qball@gmpclient.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <config.h>
#include <stdio.h>
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#include <stdlib.h>
#include <glib.h>
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#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/file.h>
#include "helper.h"
#include "rofi.h"
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static int stored_argc = 0;
static char **stored_argv = NULL;
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void cmd_set_arguments ( int argc, char **argv )
{
stored_argc = argc;
stored_argv = argv;
}
/**
* `fgets` implementation with custom separator.
*/
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char* fgets_s ( char* s, int n, FILE *iop, char sep )
{
// Map these to registers.
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register int c = EOF;
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register char* cs;
cs = s;
// read until EOF or buffer is full.
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while ( --n > 0 && ( c = getc ( iop ) ) != EOF ) {
// put the input char into the current pointer position, then increment it
// if a newline entered, break
if ( ( *cs++ = c ) == sep ) {
// Whipe separator
cs[-1] = '\0';
break;
}
}
// Always, 0 terminate the buffer.
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*cs = '\0';
// if last read was end of file and current index is start, we are done:
// Return NULL.
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return ( c == EOF && cs == s ) ? NULL : s;
}
/**
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* @param info To Match information on.
* @param res The string being generated.
* @param data User data
*
* Replace the entries. This function gets called by g_regex_replace_eval.
*
* @returns TRUE to stop replacement, FALSE to continue
*/
static gboolean helper_eval_cb ( const GMatchInfo *info,
GString *res,
gpointer data )
{
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gchar *match;
// Get the match
match = g_match_info_fetch ( info, 0 );
if ( match != NULL ) {
// Lookup the match, so we can replace it.
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gchar *r = g_hash_table_lookup ( (GHashTable *) data, match );
if ( r != NULL ) {
// Append the replacement to the string.
g_string_append ( res, r );
}
// Free match.
g_free ( match );
}
// Continue replacement.
return FALSE;
}
int helper_parse_setup ( char * string, char ***output, int *length, ... )
{
GError *error = NULL;
GHashTable *h;
h = g_hash_table_new ( g_str_hash, g_str_equal );
// By default, we insert terminal and ssh-client
g_hash_table_insert ( h, "{terminal}", config.terminal_emulator );
g_hash_table_insert ( h, "{ssh-client}", config.ssh_client );
// Add list from variable arguments.
va_list ap;
va_start ( ap, length );
while ( 1 ) {
char * key = va_arg ( ap, char * );
if ( key == NULL ) {
break;
}
char *value = va_arg ( ap, char * );
if ( value == NULL ) {
break;
}
g_hash_table_insert ( h, key, value );
}
va_end ( ap );
// Replace hits within {-\w+}.
GRegex *reg = g_regex_new ( "{[-\\w]+}", 0, 0, NULL );
char *res = g_regex_replace_eval ( reg,
string, -1,
0, 0, helper_eval_cb, h,
NULL );
// Free regex.
g_regex_unref ( reg );
// Destroy key-value storage.
g_hash_table_destroy ( h );
// Parse the string into shell arguments.
if ( g_shell_parse_argv ( res, length, output, &error ) ) {
g_free ( res );
return TRUE;
}
g_free ( res );
// Throw error if shell parsing fails.
if ( error ) {
char *msg = g_strdup_printf ( "Failed to parse: '%s'\nError: '%s'", string,
error->message );
#ifdef error_dialog
error_dialog ( msg );
#else
fputs ( msg, stderr );
#endif
g_free ( msg );
// print error.
g_error_free ( error );
}
return FALSE;
}
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char *token_collate_key ( const char *token, int case_sensitive )
{
char *tmp, *compk;
if ( case_sensitive ) {
tmp = g_strdup ( token );
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}
else {
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tmp = g_utf8_casefold ( token, -1 );
}
compk = g_utf8_collate_key ( tmp, -1 );
g_free ( tmp );
return compk;
}
char **tokenize ( const char *input, int case_sensitive )
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{
if ( input == NULL ) {
return NULL;
}
char *saveptr = NULL, *token;
char **retv = NULL;
// First entry is always full (modified) stringtext.
int num_tokens = 0;
// Copy the string, 'strtok_r' modifies it.
char *str = g_strdup ( input );
// Iterate over tokens.
// strtok should still be valid for utf8.
for ( token = strtok_r ( str, " ", &saveptr );
token != NULL;
token = strtok_r ( NULL, " ", &saveptr ) ) {
retv = g_realloc ( retv, sizeof ( char* ) * ( num_tokens + 2 ) );
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retv[num_tokens] = token_collate_key ( token, case_sensitive );
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retv[num_tokens + 1] = NULL;
num_tokens++;
}
// Free str.
g_free ( str );
return retv;
}
// cli arg handling
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int find_arg ( const char * const key )
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{
int i;
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for ( i = 0; i < stored_argc && strcasecmp ( stored_argv[i], key ); i++ ) {
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;
}
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return i < stored_argc ? i : -1;
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}
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int find_arg_str ( const char * const key, char** val )
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{
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int i = find_arg ( key );
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if ( val != NULL && i > 0 && i < stored_argc - 1 ) {
*val = stored_argv[i + 1];
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return TRUE;
}
return FALSE;
}
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int find_arg_int ( const char * const key, int *val )
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{
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int i = find_arg ( key );
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if ( val != NULL && i > 0 && i < ( stored_argc - 1 ) ) {
*val = strtol ( stored_argv[i + 1], NULL, 10 );
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return TRUE;
}
return FALSE;
}
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int find_arg_uint ( const char * const key, unsigned int *val )
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{
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int i = find_arg ( key );
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if ( val != NULL && i > 0 && i < ( stored_argc - 1 ) ) {
*val = strtoul ( stored_argv[i + 1], NULL, 10 );
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return TRUE;
}
return FALSE;
}
char helper_parse_char ( const char *arg )
{
char retv = -1;
int len = strlen ( arg );
// If the length is 1, it is not escaped.
if ( len == 1 ) {
retv = arg[0];
}
// If the length is 2 and the first character is '\', we unescape it.
else if ( len == 2 && arg[0] == '\\' ) {
// New line
if ( arg[1] == 'n' ) {
retv = '\n';
}
// Bell
else if ( arg[1] == 'a' ) {
retv = '\a';
}
// Backspace
else if ( arg[1] == 'b' ) {
retv = '\b';
}
// Tab
else if ( arg[1] == 't' ) {
retv = '\t';
}
// Vertical tab
else if ( arg[1] == 'v' ) {
retv = '\v';
}
// Form feed
else if ( arg[1] == 'f' ) {
retv = '\f';
}
// Carriage return
else if ( arg[1] == 'r' ) {
retv = '\r';
}
// Forward slash
else if ( arg[1] == '\\' ) {
retv = '\\';
}
}
else if ( len > 2 && arg[0] == '\\' && arg[1] == 'x' ) {
retv = (char) strtol ( &arg[2], NULL, 16 );
}
if ( retv < 0 ) {
fprintf ( stderr, "Failed to parse character string: \"%s\"\n", arg );
exit ( 1 );
}
return retv;
}
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int find_arg_char ( const char * const key, char *val )
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{
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int i = find_arg ( key );
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if ( val != NULL && i > 0 && i < ( stored_argc - 1 ) ) {
*val = helper_parse_char ( stored_argv[i + 1] );
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return TRUE;
}
return FALSE;
}
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/**
* Shared 'token_match' function.
* Matches tokenized.
*/
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int token_match ( char **tokens, const char *input, int case_sensitive,
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__attribute__( ( unused ) ) int index,
__attribute__( ( unused ) ) void *data )
{
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int match = 1;
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char *compk = token_collate_key ( input, case_sensitive );
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// Do a tokenized match.
if ( tokens ) {
for ( int j = 0; match && tokens[j]; j++ ) {
match = ( strstr ( compk, tokens[j] ) != NULL );
}
}
g_free ( compk );
return match;
}
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int execute_generator ( char * cmd )
{
char **args = NULL;
int argv = 0;
helper_parse_setup ( config.run_command, &args, &argv, "{cmd}", cmd, NULL );
int fd = -1;
GError *error = NULL;
g_spawn_async_with_pipes ( NULL,
args,
NULL,
G_SPAWN_SEARCH_PATH,
NULL,
NULL,
NULL,
NULL, &fd, NULL,
&error );
if ( error != NULL ) {
char *msg = g_strdup_printf ( "Failed to execute: '%s'\nError: '%s'", cmd,
error->message );
#ifdef error_dialog
error_dialog ( msg );
#else
fputs ( msg, stderr );
#endif
g_free ( msg );
// print error.
g_error_free ( error );
fd = -1;
}
g_strfreev ( args );
return fd;
}
void create_pid_file ( const char *pidfile )
{
if ( pidfile == NULL ) {
return;
}
int fd = open ( pidfile, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR );
if ( fd < 0 ) {
fprintf ( stderr, "Failed to create pid file." );
exit ( EXIT_FAILURE );
}
// Set it to close the File Descriptor on exit.
int flags = fcntl ( fd, F_GETFD, NULL );
flags = flags | FD_CLOEXEC;
if ( fcntl ( fd, F_SETFD, flags, NULL ) < 0 ) {
fprintf ( stderr, "Failed to set CLOEXEC on pidfile." );
close ( fd );
exit ( EXIT_FAILURE );
}
// Try to get exclusive write lock on FD
int retv = flock ( fd, LOCK_EX | LOCK_NB );
if ( retv != 0 ) {
fprintf ( stderr, "Failed to set lock on pidfile: Rofi already running?\n" );
fprintf ( stderr, "%d %s\n", retv, strerror ( errno ) );
exit ( EXIT_FAILURE );
}
if ( ftruncate ( fd, (off_t) 0 ) == 0 ) {
// Write pid, not needed, but for completeness sake.
char buffer[64];
int length = snprintf ( buffer, 64, "%i", getpid () );
ssize_t l = 0;
while ( l < length ) {
l += write ( fd, &buffer[l], length - l );
}
}
}
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/**
* Do some input validation, especially the first few could break things.
* It is good to catch them beforehand.
*
* This functions exits the program with 1 when it finds an invalid configuration.
*/
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void config_sanity_check ( )
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{
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if ( find_arg ( "-rnow" ) >= 0 || find_arg ( "-snow" ) >= 0 ||
find_arg ( "-now" ) >= 0 || find_arg ( "-key" ) >= 0 ||
find_arg ( "-skey" ) >= 0 || find_arg ( "-rkey" ) >= 0 ) {
fprintf ( stderr, "The -snow, -now, -rnow, -key, -rkey, -skey are deprecated "
"and have been removed.\n"
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"Please see the manpage: %s -help for the correct syntax.", stored_argv[0] );
exit ( EXIT_FAILURE );
}
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if ( config.element_height < 1 ) {
fprintf ( stderr, "config.element_height is invalid. It needs to be atleast 1 line high.\n" );
exit ( 1 );
}
if ( config.menu_columns == 0 ) {
fprintf ( stderr, "config.menu_columns is invalid. You need at least one visible column.\n" );
exit ( 1 );
}
if ( config.menu_width == 0 ) {
fprintf ( stderr, "config.menu_width is invalid. You cannot have a window with no width.\n" );
exit ( 1 );
}
if ( !( config.location >= WL_CENTER && config.location <= WL_WEST ) ) {
fprintf ( stderr, "config.location is invalid. ( %d >= %d >= %d) does not hold.\n",
WL_WEST, config.location, WL_CENTER );
exit ( 1 );
}
// If alternative row is not set, copy the normal background color.
if ( config.menu_bg_alt == NULL ) {
config.menu_bg_alt = config.menu_bg;
}
}