@@ -104,8 +104,49 @@ struct function {
char *(*func)(int argc, char *argv[], int old_argc, char *old_argv[]);
};
+static char *do_shell(int argc, char *argv[], int old_argc, char *old_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 (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 const struct function function_table[] = {
/* Name MIN MAX EXP? Function */
+ { "shell", 1, 1, true, do_shell },
};
#define FUNCTION_MAX_ARGS 16
This accepts a single command to execute. It returns the standard output from it. [Example code] config HELLO string default "$(shell,echo hello world)" config Y def_bool $(shell,echo y) [Result] $ make -s alldefconfig && tail -n 2 .config CONFIG_HELLO="hello world" CONFIG_Y=y Caveat: Like environments, functions are expanded in the lexer. You cannot pass symbols to function arguments. This is a limitation to simplify the implementation. I want to avoid the dynamic function evaluation, which would introduce much more complexity. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> --- Changes in v4: - Accept only one argument to simplify the implementation Changes in v3: None Changes in v2: None scripts/kconfig/preprocess.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) -- 2.7.4