X-Git-Url: https://jxself.org/git/?p=carl9170fw.git;a=blobdiff_plain;f=config%2Fpreprocess.c;h=5ca2df790d3cfa5f4253a33a303219aaa8fc4394;hp=56aa1f0bad0422eab2d1f1f2eb1f8d79f99b769c;hb=c38004b50bcc9378ad1981165dc8dfbb3445c0a9;hpb=c9645e9489aac917a4883ddecc857b1c6fcc2c38

diff --git a/config/preprocess.c b/config/preprocess.c
index 56aa1f0..5ca2df7 100644
--- a/config/preprocess.c
+++ b/config/preprocess.c
@@ -106,6 +106,35 @@ struct function {
 	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;
@@ -127,7 +156,7 @@ static char *do_shell(int argc, char *argv[])
 		nread--;
 
 	/* remove trailing new lines */
-	while (buf[nread - 1] == '\n')
+	while (nread > 0 && buf[nread - 1] == '\n')
 		nread--;
 
 	buf[nread] = 0;
@@ -146,9 +175,23 @@ static char *do_shell(int argc, char *argv[])
 	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
@@ -186,6 +229,7 @@ struct variable {
 	char *name;
 	char *value;
 	enum variable_flavor flavor;
+	int exp_count;
 	struct list_head node;
 };
 
@@ -210,11 +254,22 @@ static char *variable_expand(const char *name, int argc, char *argv[])
 	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;
 }
 
@@ -241,6 +296,7 @@ void variable_add(const char *name, const char *value,
 
 		v = xmalloc(sizeof(*v));
 		v->name = xstrdup(name);
+		v->exp_count = 0;
 		list_add_tail(&v->node, &variable_list);
 	}