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dialog/unix: reduce string allocations

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Simplifies logic of spawning the zenity process by avoiding allocations
of static strings
This commit is contained in:
Marcin Serwin
2024-12-07 17:26:39 +01:00
committed by Sam Lantinga
parent ff82238172
commit 4c86511035
1 changed files with 75 additions and 131 deletions
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206
src/dialog/unix/SDL_zenitydialog.c
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@@ -36,35 +36,25 @@ typedef struct
bool allow_many;
SDL_FileDialogType type;
/* Zenity only works with X11 handles apparently */
Uint64 x11_window_handle;
char x11_window_handle[64];
const char *title;
const char *accept;
const char *cancel;
} zenityArgs;
#define CLEAR_AND_RETURN() \
{ \
while (--nextarg >= 0) { \
SDL_free(argv[nextarg]); \
} \
SDL_free(argv); \
return NULL; \
}
typedef struct
{
char **argv;
int argc;
#define CHECK_OOM() \
{ \
if (!argv[nextarg - 1]) { \
CLEAR_AND_RETURN() \
} \
\
if (nextarg > argc) { \
SDL_SetError("Zenity dialog problem: argc (%d) < nextarg (%d)", \
argc, nextarg); \
CLEAR_AND_RETURN() \
} \
}
char **filters_slice;
int nfilters;
} Args;
char *zenity_clean_name(const char *name)
#define NULL_ARGS \
(Args) { NULL }
static char *zenity_clean_name(const char *name)
{
char *newname = SDL_strdup(name);
@@ -89,70 +79,31 @@ char *zenity_clean_name(const char *name)
* [--cancel-label CANCEL]
* [--file-filter=Filter Name | *.filt *.fn ...]...
*/
static char** generate_args(const zenityArgs* info)
static Args generate_args(const zenityArgs *info)
{
int argc = 3;
int nextarg = 0;
char **argv = NULL;
// ARGC PASS
if (info->allow_many) {
argc++;
}
switch (info->type) {
case SDL_FILEDIALOG_OPENFILE:
break;
case SDL_FILEDIALOG_SAVEFILE:
argc += 2;
break;
case SDL_FILEDIALOG_OPENFOLDER:
argc++;
break;
};
if (info->filename) {
argc += 2;
}
if (info->x11_window_handle) {
argc += 3;
}
if (info->title) {
argc += 2;
}
if (info->accept) {
argc += 2;
}
if (info->cancel) {
argc += 2;
}
if (info->filters) {
argc += info->nfilters;
}
argv = SDL_malloc(sizeof(char *) * argc + 1);
int argc = 0;
char **argv = SDL_malloc(
sizeof(*argv) * (3 /* zenity --file-selection --separator=\n */
+ 1 /* --multiple */
+ 1 /* --directory */
+ 2 /* --save --confirm-overwrite */
+ 2 /* --filename [file] */
+ 3 /* --modal --attach [handle] */
+ 2 /* --title [title] */
+ 2 /* --ok-label [label] */
+ 2 /* --cancel-label [label] */
+ info->nfilters + 1 /* NULL */));
if (!argv) {
return NULL;
return NULL_ARGS;
}
// ARGV PASS
argv[nextarg++] = SDL_strdup("zenity");
CHECK_OOM()
argv[nextarg++] = SDL_strdup("--file-selection");
CHECK_OOM()
argv[nextarg++] = SDL_strdup("--separator=\n");
CHECK_OOM()
argv[argc++] = "zenity";
argv[argc++] = "--file-selection";
argv[argc++] = "--separator=\n";
if (info->allow_many) {
argv[nextarg++] = SDL_strdup("--multiple");
CHECK_OOM()
argv[argc++] = "--multiple";
}
switch (info->type) {
@@ -160,61 +111,43 @@ static char** generate_args(const zenityArgs* info)
break;
case SDL_FILEDIALOG_SAVEFILE:
argv[nextarg++] = SDL_strdup("--save");
argv[argc++] = "--save";
/* Asking before overwriting while saving seems like a sane default */
argv[nextarg++] = SDL_strdup("--confirm-overwrite");
argv[argc++] = "--confirm-overwrite";
break;
case SDL_FILEDIALOG_OPENFOLDER:
argv[nextarg++] = SDL_strdup("--directory");
argv[argc++] = "--directory";
break;
};
if (info->filename) {
argv[nextarg++] = SDL_strdup("--filename");
CHECK_OOM()
argv[nextarg++] = SDL_strdup(info->filename);
CHECK_OOM()
argv[argc++] = "--filename";
argv[argc++] = (char *)info->filename;
}
if (info->x11_window_handle) {
argv[nextarg++] = SDL_strdup("--modal");
CHECK_OOM()
argv[nextarg++] = SDL_strdup("--attach");
CHECK_OOM()
argv[nextarg++] = SDL_malloc(64);
CHECK_OOM()
SDL_snprintf(argv[nextarg - 1], 64, "0x%" SDL_PRIx64, info->x11_window_handle);
if (info->x11_window_handle[0]) {
argv[argc++] = "--modal";
argv[argc++] = "--attach";
argv[argc++] = (char *)info->x11_window_handle;
}
if (info->title) {
argv[nextarg++] = SDL_strdup("--title");
CHECK_OOM()
argv[nextarg++] = SDL_strdup(info->title);
CHECK_OOM()
argv[argc++] = "--title";
argv[argc++] = (char *)info->title;
}
if (info->accept) {
argv[nextarg++] = SDL_strdup("--ok-label");
CHECK_OOM()
argv[nextarg++] = SDL_strdup(info->accept);
CHECK_OOM()
argv[argc++] = "--ok-label";
argv[argc++] = (char *)info->accept;
}
if (info->cancel) {
argv[nextarg++] = SDL_strdup("--cancel-label");
CHECK_OOM()
argv[nextarg++] = SDL_strdup(info->cancel);
CHECK_OOM()
argv[argc++] = "--cancel-label";
argv[argc++] = (char *)info->cancel;
}
char **filters_slice = &argv[argc];
if (info->filters) {
for (int i = 0; i < info->nfilters; i++) {
char *filter_str = convert_filter(info->filters[i],
@@ -223,29 +156,38 @@ static char** generate_args(const zenityArgs* info)
"*.", " *.", "");
if (!filter_str) {
CLEAR_AND_RETURN()
while (i--) {
SDL_free(filters_slice[i]);
}
SDL_free(argv);
return NULL_ARGS;
}
argv[nextarg++] = filter_str;
CHECK_OOM()
filters_slice[i] = filter_str;
}
}
argv[nextarg++] = NULL;
argc += info->nfilters;
argv[argc] = NULL;
return argv;
return (Args){
.argv = argv,
.argc = argc,
.filters_slice = filters_slice,
.nfilters = info->nfilters
};
}
void free_args(char **argv)
static void free_args(Args args)
{
char **ptr = argv;
while (*ptr) {
SDL_free(*ptr);
ptr++;
if (!args.argv) {
return;
}
for (int i = 0; i < args.nfilters; i++) {
SDL_free(args.filters_slice[i]);
}
SDL_free(argv);
SDL_free(args.argv);
}
// TODO: Zenity survives termination of the parent
@@ -255,7 +197,6 @@ static void run_zenity(zenityArgs* arg_struct)
SDL_DialogFileCallback callback = arg_struct->callback;
void* userdata = arg_struct->userdata;
SDL_Process *process = NULL;
char **args = NULL;
SDL_Environment *env = NULL;
int status = -1;
size_t bytes_read = 0;
@@ -264,8 +205,8 @@ static void run_zenity(zenityArgs* arg_struct)
char **array = NULL;
bool result = false;
args = generate_args(arg_struct);
if (!args) {
Args args = generate_args(arg_struct);
if (!args.argv) {
goto done;
}
@@ -284,7 +225,7 @@ static void run_zenity(zenityArgs* arg_struct)
SDL_SetEnvironmentVariable(env, "ZENITY_TIMEOUT", "2", true);
SDL_PropertiesID props = SDL_CreateProperties();
SDL_SetPointerProperty(props, SDL_PROP_PROCESS_CREATE_ARGS_POINTER, args);
SDL_SetPointerProperty(props, SDL_PROP_PROCESS_CREATE_ARGS_POINTER, args.argv);
SDL_SetPointerProperty(props, SDL_PROP_PROCESS_CREATE_ENVIRONMENT_POINTER, env);
SDL_SetNumberProperty(props, SDL_PROP_PROCESS_CREATE_STDIN_NUMBER, SDL_PROCESS_STDIO_NULL);
SDL_SetNumberProperty(props, SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER, SDL_PROCESS_STDIO_APP);
@@ -372,7 +313,7 @@ void SDL_Zenity_ShowFileDialogWithProperties(SDL_FileDialogType type, SDL_Dialog
args->nfilters = SDL_GetNumberProperty(props, SDL_PROP_FILE_DIALOG_NFILTERS_NUMBER, 0);
args->allow_many = SDL_GetBooleanProperty(props, SDL_PROP_FILE_DIALOG_MANY_BOOLEAN, false);
args->type = type;
args->x11_window_handle = 0;
args->x11_window_handle[0] = 0;
args->title = SDL_GetStringProperty(props, SDL_PROP_FILE_DIALOG_TITLE_STRING, NULL);
args->accept = SDL_GetStringProperty(props, SDL_PROP_FILE_DIALOG_ACCEPT_STRING, NULL);
args->cancel = SDL_GetStringProperty(props, SDL_PROP_FILE_DIALOG_CANCEL_STRING, NULL);
@@ -381,7 +322,10 @@ void SDL_Zenity_ShowFileDialogWithProperties(SDL_FileDialogType type, SDL_Dialog
if (window) {
SDL_PropertiesID window_props = SDL_GetWindowProperties(window);
if (window_props) {
args->x11_window_handle = (Uint64) SDL_GetNumberProperty(window_props, SDL_PROP_WINDOW_X11_WINDOW_NUMBER, 0);
Uint64 handle = (Uint64)SDL_GetNumberProperty(window_props, SDL_PROP_WINDOW_X11_WINDOW_NUMBER, 0);
if (handle) {
SDL_snprintf(args->x11_window_handle, 64, "0x%" SDL_PRIx64, handle);
}
}
}