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#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xkbcommon/xkbcommon.h>
static char **log_buffer = NULL;
static int log_buffer_size = 0;
static bool log_alloc_success = true;
static void add_log(struct xkb_context *ctx, enum xkb_log_level level,
const char *fmt, va_list args)
{
size_t buflen;
va_list tmpargs;
log_buffer_size++;
if (log_buffer == NULL)
log_buffer = malloc(sizeof(char *));
else
log_buffer = realloc(log_buffer, sizeof(char *) * log_buffer_size);
if (log_buffer == NULL) {
perror("buffer alloc");
log_alloc_success = false;
log_buffer_size--;
return;
}
/* Unfortunately, vasprintf() is a GNU extension and thus not very
* portable, so let's first get the required buffer size using a dummy
* vsnprintf and afterwards allocate the returned amount of bytes.
*
* We also need to make a copy of the args, because the value of the args
* will be indeterminate after the return.
*/
va_copy(tmpargs, args);
buflen = vsnprintf(NULL, 0, fmt, tmpargs);
va_end(tmpargs);
log_buffer[log_buffer_size - 1] = malloc(++buflen);
if (vsnprintf(log_buffer[log_buffer_size - 1], buflen, fmt, args) == -1) {
perror("log line alloc");
log_alloc_success = false;
}
va_end(args);
}
static void print_logs(void)
{
for (int i = 0; i < log_buffer_size; ++i)
fprintf(stderr, " %s", log_buffer[i]);
}
static void free_logs(void)
{
if (log_buffer == NULL)
return;
for (int i = 0; i < log_buffer_size; ++i)
free(log_buffer[i]);
free(log_buffer);
log_buffer = NULL;
log_buffer_size = 0;
}
static bool try_keymap(struct xkb_context *ctx, struct xkb_rule_names *rdef)
{
struct xkb_keymap *keymap;
bool result = true;
if ((keymap = xkb_keymap_new_from_names(ctx, rdef, 0)) == NULL)
result = false;
else
xkb_keymap_unref(keymap);
return result;
}
static void print_error(const char *name, const char *value,
const char *nixos_option)
{
fprintf(stderr, "\nThe value `%s' for keyboard %s is invalid.\n\n"
"Please check the definition in `services.xserver.%s'.\n",
value, name, nixos_option);
fputs("\nDetailed XKB compiler errors:\n\n", stderr);
print_logs();
putc('\n', stderr);
}
#define TRY_KEYMAP(name, value, nixos_option) \
*rdef = (struct xkb_rule_names) {0}; \
free_logs(); \
rdef->name = value; \
result = try_keymap(ctx, rdef); \
if (!log_alloc_success) \
goto out; \
if (!result) { \
print_error(#name, value, nixos_option); \
exit_code = EXIT_FAILURE; \
goto out; \
}
int main(int argc, char **argv)
{
int exit_code = EXIT_SUCCESS;
bool result;
struct xkb_context *ctx;
struct xkb_rule_names *rdef;
if (argc != 5) {
fprintf(stderr, "Usage: %s model layout variant options\n", argv[0]);
return EXIT_FAILURE;
}
ctx = xkb_context_new(XKB_CONTEXT_NO_ENVIRONMENT_NAMES);
xkb_context_set_log_fn(ctx, add_log);
rdef = malloc(sizeof(struct xkb_rule_names));
TRY_KEYMAP(model, argv[1], "xkbModel");
TRY_KEYMAP(layout, argv[2], "layout");
TRY_KEYMAP(variant, argv[3], "xkbVariant");
TRY_KEYMAP(options, argv[4], "xkbOptions");
free_logs();
rdef->model = argv[1];
rdef->layout = argv[2];
rdef->variant = argv[3];
rdef->options = argv[4];
result = try_keymap(ctx, rdef);
if (!log_alloc_success)
goto out;
if (!result) {
fputs("The XKB keyboard definition failed to compile:\n", stderr);
print_logs();
exit_code = EXIT_FAILURE;
}
out:
free_logs();
free(rdef);
xkb_context_unref(ctx);
return exit_code;
}
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