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#include <stdio.h>
#include <string.h>
#include <log/log.h>
#include <types/types.h>
#include <talloc/talloc.h>
#include <array-size/array-size.h>
#include "grub2.h"
static int builtin_set(struct grub2_script *script,
void *data __attribute__((unused)),
int argc, char *argv[])
{
char *name, *value, *p;
int i;
if (argc < 2)
return -1;
p = strchr(argv[1], '=');
if (!p)
return -1;
name = talloc_strndup(script, argv[1], p - argv[1]);
value = talloc_strdup(script, p+1);
for (i = 2; i < argc; i++)
value = talloc_asprintf_append(value, " %s", argv[i]);
script_env_set(script, name, value);
return 0;
}
static int builtin_linux(struct grub2_script *script,
void *data __attribute__((unused)),
int argc, char *argv[])
{
struct discover_boot_option *opt = script->opt;
const char *root;
int i;
if (!opt) {
pb_log("grub2 syntax error: 'linux' statement outside "
"a menuentry.\n");
return -1;
}
if (argc < 2) {
pb_log("grub2 syntax error: no filename provided to "
"linux statement\n");
return -1;
}
root = script_env_get(script, "root");
opt->boot_image = create_grub2_resource(opt, script->ctx->device,
root, argv[1]);
opt->option->boot_args = NULL;
if (argc > 2)
opt->option->boot_args = talloc_strdup(opt, argv[2]);
for (i = 3; i < argc; i++)
opt->option->boot_args = talloc_asprintf_append(
opt->option->boot_args,
" %s", argv[i]);
return 0;
}
static int builtin_initrd(struct grub2_script *script,
void *data __attribute__((unused)),
int argc, char *argv[])
{
struct discover_boot_option *opt = script->opt;
const char *root;
if (!opt) {
pb_log("grub2 syntax error: 'initrd' statement outside "
"a menuentry.\n");
return -1;
}
if (argc < 2) {
pb_log("grub2 syntax error: no filename provided to "
"initrd statement\n");
return -1;
}
root = script_env_get(script, "root");
opt->initrd = create_grub2_resource(opt, script->ctx->device,
root, argv[1]);
return 0;
}
static int builtin_search(struct grub2_script *script,
void *data __attribute__((unused)),
int argc, char *argv[])
{
const char *env_var, *spec;
int i;
env_var = NULL;
for (i = 1; i < argc - 1; i++) {
if (!strncmp(argv[i], "--set=", strlen("--set="))) {
env_var = argv[i] + strlen("--set=");
break;
}
}
if (!env_var)
return 0;
spec = argv[argc - 1];
script_env_set(script, env_var, spec);
return 0;
}
static bool builtin_test_op(int argc, char **argv, int *consumed)
{
char *op;
if (argc >= 3) {
const char *a1, *a2;
a1 = argv[0];
op = argv[1];
a2 = argv[2];
if (!strcmp(op, "=") || !strcmp(op, "==")) {
*consumed = 3;
return !strcmp(a1, a2);
}
if (!strcmp(op, "!=")) {
*consumed = 3;
return strcmp(a1, a2);
}
if (!strcmp(op, "<")) {
*consumed = 3;
return strcmp(a1, a2) < 0;
}
if (!strcmp(op, ">")) {
*consumed = 3;
return strcmp(a1, a2) > 0;
}
}
if (argc >= 2) {
const char *a1;
op = argv[0];
a1 = argv[1];
if (!strcmp(op, "-z")) {
*consumed = 2;
return strlen(a1) == 0;
}
if (!strcmp(op, "-n")) {
*consumed = 2;
return strlen(a1) != 0;
}
/* todo: implement file checks */
if (!strcmp(op, "-s") || !strcmp(op, "-f")) {
*consumed = 2;
return false;
}
}
*consumed = 1;
return strlen(op) > 0;
}
static int builtin_test(struct grub2_script *script __attribute__((unused)),
void *data __attribute__((unused)),
int argc, char *argv[])
{
int consumed;
bool not, rc;
if (!strcmp(argv[0], "[") && !strcmp(argv[argc - 1], "]"))
argc--;
/* skip command name */
argc--;
argv++;
not = false;
rc = false;
for (consumed = 0; argc > 0; argv += consumed, argc -= consumed) {
if (!strcmp(argv[0], "!")) {
not = true;
consumed = 1;
continue;
}
if (!strcmp(argv[0], "-a")) {
if (!rc)
return 1;
consumed = 1;
continue;
}
if (!strcmp(argv[0], "-o")) {
if (rc)
return 0;
consumed = 1;
continue;
}
rc = builtin_test_op(argc, argv, &consumed);
if (not) {
rc = !rc;
not = false;
}
}
return rc ? 0 : 1;
}
static int builtin_nop(struct grub2_script *script __attribute__((unused)),
void *data __attribute__((unused)),
int argc __attribute__((unused)),
char *argv[] __attribute__((unused)))
{
return 0;
}
static struct {
const char *name;
grub2_function fn;
} builtins[] = {
{
.name = "set",
.fn = builtin_set,
},
{
.name = "linux",
.fn = builtin_linux,
},
{
.name = "initrd",
.fn = builtin_initrd,
},
{
.name = "search",
.fn = builtin_search,
},
{
.name = "[",
.fn = builtin_test,
},
{
.name = "test",
.fn = builtin_test,
},
};
static const char *nops[] = {
"echo", "export", "insmod", "loadfont", "terminfo",
};
void register_builtins(struct grub2_script *script)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(builtins); i++)
script_register_function(script, builtins[i].name,
builtins[i].fn, NULL);
for (i = 0; i < ARRAY_SIZE(nops); i++)
script_register_function(script, nops[i], builtin_nop, NULL);
}
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