kconfig: add 'shell' built-in function (2fd5b09c) · Commits · 戴 / test

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>

scripts/kconfig/preprocess.c

+41 −0

Original line number	Diff line number	Diff line
		@@ -106,8 +106,49 @@ struct function {
		char (func)(int argc, char *argv[]);
		};

		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 (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 Function */
		{ "shell", 1, 1, do_shell },
		};

		#define FUNCTION_MAX_ARGS 16

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