[Cscope-devel] [PATCH 2/2] cscope: make it possible to add the new keywords

[Oleg N. <ol...@re...>]

The linux kernel uses a lot of annotations which confuse cscope.
Simple example:

	$ cat -n test.c
	     1	void func1(void) __acquires(RCU)
	     2	{
	     3		X = 1;
	     4	}
	     5
	     6	void func2(void) __releases(RCU)
	     7	{
	     8		X = 1;
	     9	}

Without this patch:

	$ ./src/cscope -bu test.c
	$ ./src/cscope -dL -0 X
	test.c __acquires 3 X = 1;
	test.c __releases 8 X = 1;

With this patch:

	$ ./src/cscope -bu -K __acquires,__releases test.c
	$ ./src/cscope -dL -0 X
	test.c func1 3 X = 1;
	test.c func2 8 X = 1;

Signed-off-by: Oleg Nesterov <ol...@re...>
---
 src/global.h |  1 +
 src/lookup.c | 35 +++++++++++++++++++++++++++++++----
 src/main.c   |  5 ++++-
 3 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/src/global.h b/src/global.h
index a6f1486..5f75b68 100644
--- a/src/global.h
+++ b/src/global.h
@@ -342,6 +342,7 @@ char	*read_block(void);
 char	*scanpast(char c);
 
 
+void	add_keyword(char *csk);
 void	addcmd(int f, char *s);
 void	addsrcfile(char *path);
 void	askforchar(void);
diff --git a/src/lookup.c b/src/lookup.c
index d8595db..71e4aac 100644
--- a/src/lookup.c
+++ b/src/lookup.c
@@ -51,7 +51,9 @@ char	uniontext[] = "union";
  * without changing the database file version and adding compatibility code
  * for old databases.
  */
-struct	keystruct keyword[] = {
+#define KEYWORDS	64
+
+struct	keystruct keyword[KEYWORDS] = {
 	{"",		'\0',	NULL},	/* dummy entry */
 	{"#define",	' ',	NULL},	/* must be table entry 1 */
 	{"#include",	' ',	NULL},	/* must be table entry 2 */
@@ -93,7 +95,32 @@ struct	keystruct keyword[] = {
 	{"signed",	' ',	NULL},
 	{"volatile",	' ',	NULL},
 };
-#define KEYWORDS	(sizeof(keyword) / sizeof(keyword[0]))
+
+static int keyword_nr = 38;
+
+void add_keyword(char *csk)
+{
+	for (;;) {
+		char *eok = strchrnul(csk, ',');
+		int last = !*eok;
+
+		*eok = 0;
+		if (*csk) {
+			if (keyword_nr == KEYWORDS) {
+				fprintf(stderr, "KEYWORDS overflow\n");
+				myexit(1);
+			}
+			keyword[keyword_nr].text = csk;
+			keyword[keyword_nr].delim = '(';
+			keyword_nr++;
+		}
+
+		if (last)
+			break;
+		csk = eok + 1;
+	}
+}
+
 
 #define HASHMOD	(KEYWORDS * 2 + 1)
 
@@ -106,8 +133,8 @@ initsymtab(void)
 {
     unsigned int i, j;
     struct keystruct *p;
-	
-    for (i = 1; i < KEYWORDS; ++i) {
+
+    for (i = 1; i < keyword_nr; ++i) {
 	p = keyword + i;
 	j = hash(p->text) % HASHMOD;
 	p->next = hashtab[j];
diff --git a/src/main.c b/src/main.c
index 2ffabc3..055b222 100644
--- a/src/main.c
+++ b/src/main.c
@@ -153,7 +153,7 @@ char ** parse_options(int *argc, char **argv)
 	
 
 	while ((opt = getopt_long(argcc, argv,
-	       "hVbcCdeF:f:I:i:kLl0:1:2:3:4:5:6:7:8:9:P:p:qRs:TUuvX",
+	       "hVbcCdeF:f:I:i:kLl0:1:2:3:4:5:6:7:8:9:P:p:qRs:TUuvXK:",
 	       lopts, &longind)) != -1) {
 		switch(opt) {
 
@@ -273,6 +273,9 @@ char ** parse_options(int *argc, char **argv)
 		case 's':	/* additional source file directory */
 			sourcedir(optarg);
 			break;
+		case 'K':
+			add_keyword(optarg);
+			break;
 		}
 	}
 	/*
-- 
2.25.1.362.g51ebf55