char *(*func)(int argc, char *argv[]);
};
+static char *do_error_if(int argc, char *argv[])
+{
+ if (!strcmp(argv[0], "y"))
+ pperror("%s", argv[1]);
+
+ return NULL;
+}
+
+static char *do_filename(int argc, char *argv[])
+{
+ return xstrdup(current_file->name);
+}
+
+static char *do_info(int argc, char *argv[])
+{
+ printf("%s\n", argv[0]);
+
+ return xstrdup("");
+}
+
+static char *do_lineno(int argc, char *argv[])
+{
+ char buf[16];
+
+ sprintf(buf, "%d", yylineno);
+
+ return xstrdup(buf);
+}
+
+static char *do_shell(int argc, char *argv[])
+{
+ FILE *p;
+ char buf[256];
+ char *cmd;
+ size_t nread;
+ int i;
+
+ cmd = argv[0];
+
+ p = popen(cmd, "r");
+ if (!p) {
+ perror(cmd);
+ exit(1);
+ }
+
+ nread = fread(buf, 1, sizeof(buf), p);
+ if (nread == sizeof(buf))
+ nread--;
+
+ /* remove trailing new lines */
+ while (nread > 0 && buf[nread - 1] == '\n')
+ nread--;
+
+ buf[nread] = 0;
+
+ /* replace a new line with a space */
+ for (i = 0; i < nread; i++) {
+ if (buf[i] == '\n')
+ buf[i] = ' ';
+ }
+
+ if (pclose(p) == -1) {
+ perror(cmd);
+ exit(1);
+ }
+
+ return xstrdup(buf);
+}
+
+static char *do_warning_if(int argc, char *argv[])
+{
+ if (!strcmp(argv[0], "y"))
+ fprintf(stderr, "%s:%d: %s\n",
+ current_file->name, yylineno, argv[1]);
+
+ return xstrdup("");
+}
+
static const struct function function_table[] = {
/* Name MIN MAX Function */
+ { "error-if", 2, 2, do_error_if },
+ { "filename", 0, 0, do_filename },
+ { "info", 1, 1, do_info },
+ { "lineno", 0, 0, do_lineno },
+ { "shell", 1, 1, do_shell },
+ { "warning-if", 2, 2, do_warning_if },
};
#define FUNCTION_MAX_ARGS 16
return NULL;
}
+/*
+ * Variables (and user-defined functions)
+ */
+static LIST_HEAD(variable_list);
+
+struct variable {
+ char *name;
+ char *value;
+ enum variable_flavor flavor;
+ int exp_count;
+ struct list_head node;
+};
+
+static struct variable *variable_lookup(const char *name)
+{
+ struct variable *v;
+
+ list_for_each_entry(v, &variable_list, node) {
+ if (!strcmp(name, v->name))
+ return v;
+ }
+
+ return NULL;
+}
+
+static char *variable_expand(const char *name, int argc, char *argv[])
+{
+ struct variable *v;
+ char *res;
+
+ v = variable_lookup(name);
+ if (!v)
+ return NULL;
+
+ if (argc == 0 && v->exp_count)
+ pperror("Recursive variable '%s' references itself (eventually)",
+ name);
+
+ if (v->exp_count > 1000)
+ pperror("Too deep recursive expansion");
+
+ v->exp_count++;
+
+ if (v->flavor == VAR_RECURSIVE)
+ res = expand_string_with_args(v->value, argc, argv);
+ else
+ res = xstrdup(v->value);
+
+ v->exp_count--;
+
+ return res;
+}
+
+void variable_add(const char *name, const char *value,
+ enum variable_flavor flavor)
+{
+ struct variable *v;
+ char *new_value;
+ bool append = false;
+
+ v = variable_lookup(name);
+ if (v) {
+ /* For defined variables, += inherits the existing flavor */
+ if (flavor == VAR_APPEND) {
+ flavor = v->flavor;
+ append = true;
+ } else {
+ free(v->value);
+ }
+ } else {
+ /* For undefined variables, += assumes the recursive flavor */
+ if (flavor == VAR_APPEND)
+ flavor = VAR_RECURSIVE;
+
+ v = xmalloc(sizeof(*v));
+ v->name = xstrdup(name);
+ v->exp_count = 0;
+ list_add_tail(&v->node, &variable_list);
+ }
+
+ v->flavor = flavor;
+
+ if (flavor == VAR_SIMPLE)
+ new_value = expand_string(value);
+ else
+ new_value = xstrdup(value);
+
+ if (append) {
+ v->value = xrealloc(v->value,
+ strlen(v->value) + strlen(new_value) + 2);
+ strcat(v->value, " ");
+ strcat(v->value, new_value);
+ free(new_value);
+ } else {
+ v->value = new_value;
+ }
+}
+
+static void variable_del(struct variable *v)
+{
+ list_del(&v->node);
+ free(v->name);
+ free(v->value);
+ free(v);
+}
+
+void variable_all_del(void)
+{
+ struct variable *v, *tmp;
+
+ list_for_each_entry_safe(v, tmp, &variable_list, node)
+ variable_del(v);
+}
+
/*
* Evaluate a clause with arguments. argc/argv are arguments from the upper
* function call.
*/
static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
{
- char *tmp, *name, *res, *prev, *p;
+ char *tmp, *name, *res, *endptr, *prev, *p;
int new_argc = 0;
char *new_argv[FUNCTION_MAX_ARGS];
int nest = 0;
int i;
+ unsigned long n;
tmp = xstrndup(str, len);
+ /*
+ * If variable name is '1', '2', etc. It is generally an argument
+ * from a user-function call (i.e. local-scope variable). If not
+ * available, then look-up global-scope variables.
+ */
+ n = strtoul(tmp, &endptr, 10);
+ if (!*endptr && n > 0 && n <= argc) {
+ res = xstrdup(argv[n - 1]);
+ goto free_tmp;
+ }
+
prev = p = tmp;
/*
new_argv[i] = expand_string_with_args(new_argv[i + 1],
argc, argv);
+ /* Search for variables */
+ res = variable_expand(name, new_argc, new_argv);
+ if (res)
+ goto free;
+
/* Look for built-in functions */
res = function_expand(name, new_argc, new_argv);
if (res)
for (i = 0; i < new_argc; i++)
free(new_argv[i]);
free(name);
+free_tmp:
free(tmp);
return res;
static bool is_end_of_token(char c)
{
- /* Why are '.' and '/' valid characters for symbols? */
- return !(isalnum(c) || c == '_' || c == '-' || c == '.' || c == '/');
+ return !(isalnum(c) || c == '_' || c == '-');
}
/*
projects / carl9170fw.git / blobdiff