X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=builtin-grep.c;h=0bd517b2649af37d9980f85e784f9a00c3263922;hb=409d1d2053657f73a3222651111740606122aa80;hp=5fac5701e6ccebdbe83b00d2e2df19343d3aea0e;hpb=44fe4f522e63d3f01174459af674af2f9c293671;p=git.git

diff --git a/builtin-grep.c b/builtin-grep.c
index 5fac5701e..0bd517b26 100644
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -29,10 +29,11 @@ static int pathspec_matches(const char **paths, const char *name)
 		int matchlen = strlen(match);
 		const char *cp, *meta;
 
-		if ((matchlen <= namelen) &&
-		    !strncmp(name, match, matchlen) &&
-		    (match[matchlen-1] == '/' ||
-		     name[matchlen] == '\0' || name[matchlen] == '/'))
+		if (!matchlen ||
+		    ((matchlen <= namelen) &&
+		     !strncmp(name, match, matchlen) &&
+		     (match[matchlen-1] == '/' ||
+		      name[matchlen] == '\0' || name[matchlen] == '/')))
 			return 1;
 		if (!fnmatch(match, name, 0))
 			return 1;
@@ -81,17 +82,48 @@ static int pathspec_matches(const char **paths, const char *name)
 	return 0;
 }
 
+enum grep_pat_token {
+	GREP_PATTERN,
+	GREP_AND,
+	GREP_OPEN_PAREN,
+	GREP_CLOSE_PAREN,
+	GREP_NOT,
+	GREP_OR,
+};
+
 struct grep_pat {
 	struct grep_pat *next;
 	const char *origin;
 	int no;
+	enum grep_pat_token token;
 	const char *pattern;
 	regex_t regexp;
 };
 
+enum grep_expr_node {
+	GREP_NODE_ATOM,
+	GREP_NODE_NOT,
+	GREP_NODE_AND,
+	GREP_NODE_OR,
+};
+
+struct grep_expr {
+	enum grep_expr_node node;
+	union {
+		struct grep_pat *atom;
+		struct grep_expr *unary;
+		struct {
+			struct grep_expr *left;
+			struct grep_expr *right;
+		} binary;
+	} u;
+};
+
 struct grep_opt {
 	struct grep_pat *pattern_list;
 	struct grep_pat **pattern_tail;
+	struct grep_expr *pattern_expression;
+	int prefix_length;
 	regex_t regexp;
 	unsigned linenum:1;
 	unsigned invert:1;
@@ -104,43 +136,168 @@ struct grep_opt {
 #define GREP_BINARY_NOMATCH	1
 #define GREP_BINARY_TEXT	2
 	unsigned binary:2;
+	unsigned extended:1;
+	unsigned relative:1;
 	int regflags;
 	unsigned pre_context;
 	unsigned post_context;
 };
 
 static void add_pattern(struct grep_opt *opt, const char *pat,
-			const char *origin, int no)
+			const char *origin, int no, enum grep_pat_token t)
 {
 	struct grep_pat *p = xcalloc(1, sizeof(*p));
 	p->pattern = pat;
 	p->origin = origin;
 	p->no = no;
+	p->token = t;
 	*opt->pattern_tail = p;
 	opt->pattern_tail = &p->next;
 	p->next = NULL;
 }
 
+static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
+{
+	int err = regcomp(&p->regexp, p->pattern, opt->regflags);
+	if (err) {
+		char errbuf[1024];
+		char where[1024];
+		if (p->no)
+			sprintf(where, "In '%s' at %d, ",
+				p->origin, p->no);
+		else if (p->origin)
+			sprintf(where, "%s, ", p->origin);
+		else
+			where[0] = 0;
+		regerror(err, &p->regexp, errbuf, 1024);
+		regfree(&p->regexp);
+		die("%s'%s': %s", where, p->pattern, errbuf);
+	}
+}
+
+static struct grep_expr *compile_pattern_expr(struct grep_pat **);
+static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
+{
+	struct grep_pat *p;
+	struct grep_expr *x;
+
+	p = *list;
+	switch (p->token) {
+	case GREP_PATTERN: /* atom */
+		x = xcalloc(1, sizeof (struct grep_expr));
+		x->node = GREP_NODE_ATOM;
+		x->u.atom = p;
+		*list = p->next;
+		return x;
+	case GREP_OPEN_PAREN:
+		*list = p->next;
+		x = compile_pattern_expr(list);
+		if (!x)
+			return NULL;
+		if (!*list || (*list)->token != GREP_CLOSE_PAREN)
+			die("unmatched parenthesis");
+		*list = (*list)->next;
+		return x;
+	default:
+		return NULL;
+	}
+}
+
+static struct grep_expr *compile_pattern_not(struct grep_pat **list)
+{
+	struct grep_pat *p;
+	struct grep_expr *x;
+
+	p = *list;
+	switch (p->token) {
+	case GREP_NOT:
+		if (!p->next)
+			die("--not not followed by pattern expression");
+		*list = p->next;
+		x = xcalloc(1, sizeof (struct grep_expr));
+		x->node = GREP_NODE_NOT;
+		x->u.unary = compile_pattern_not(list);
+		if (!x->u.unary)
+			die("--not followed by non pattern expression");
+		return x;
+	default:
+		return compile_pattern_atom(list);
+	}
+}
+
+static struct grep_expr *compile_pattern_and(struct grep_pat **list)
+{
+	struct grep_pat *p;
+	struct grep_expr *x, *y, *z;
+
+	x = compile_pattern_not(list);
+	p = *list;
+	if (p && p->token == GREP_AND) {
+		if (!p->next)
+			die("--and not followed by pattern expression");
+		*list = p->next;
+		y = compile_pattern_and(list);
+		if (!y)
+			die("--and not followed by pattern expression");
+		z = xcalloc(1, sizeof (struct grep_expr));
+		z->node = GREP_NODE_AND;
+		z->u.binary.left = x;
+		z->u.binary.right = y;
+		return z;
+	}
+	return x;
+}
+
+static struct grep_expr *compile_pattern_or(struct grep_pat **list)
+{
+	struct grep_pat *p;
+	struct grep_expr *x, *y, *z;
+
+	x = compile_pattern_and(list);
+	p = *list;
+	if (x && p && p->token != GREP_CLOSE_PAREN) {
+		y = compile_pattern_or(list);
+		if (!y)
+			die("not a pattern expression %s", p->pattern);
+		z = xcalloc(1, sizeof (struct grep_expr));
+		z->node = GREP_NODE_OR;
+		z->u.binary.left = x;
+		z->u.binary.right = y;
+		return z;
+	}
+	return x;
+}
+
+static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
+{
+	return compile_pattern_or(list);
+}
+
 static void compile_patterns(struct grep_opt *opt)
 {
 	struct grep_pat *p;
+
+	/* First compile regexps */
 	for (p = opt->pattern_list; p; p = p->next) {
-		int err = regcomp(&p->regexp, p->pattern, opt->regflags);
-		if (err) {
-			char errbuf[1024];
-			char where[1024];
-			if (p->no)
-				sprintf(where, "In '%s' at %d, ",
-					p->origin, p->no);
-			else if (p->origin)
-				sprintf(where, "%s, ", p->origin);
-			else
-				where[0] = 0;
-			regerror(err, &p->regexp, errbuf, 1024);
-			regfree(&p->regexp);
-			die("%s'%s': %s", where, p->pattern, errbuf);
-		}
+		if (p->token == GREP_PATTERN)
+			compile_regexp(p, opt);
+		else
+			opt->extended = 1;
 	}
+
+	if (!opt->extended)
+		return;
+
+	/* Then bundle them up in an expression.
+	 * A classic recursive descent parser would do.
+	 */
+	p = opt->pattern_list;
+	opt->pattern_expression = compile_pattern_expr(&p);
+#if DEBUG
+	dump_pattern_exp(opt->pattern_expression, 0);
+#endif
+	if (p)
+		die("incomplete pattern expression: %s", p->pattern);
 }
 
 static char *end_of_line(char *cp, unsigned long *left)
@@ -176,9 +333,7 @@ static int buffer_is_binary(const char *ptr, unsigned long size)
 {
 	if (FIRST_FEW_BYTES < size)
 		size = FIRST_FEW_BYTES;
-	if (memchr(ptr, 0, size))
-		return 1;
-	return 0;
+	return !!memchr(ptr, 0, size);
 }
 
 static int fixmatch(const char *pattern, char *line, regmatch_t *match)
@@ -195,6 +350,94 @@ static int fixmatch(const char *pattern, char *line, regmatch_t *match)
 	}
 }
 
+static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol, char *eol)
+{
+	int hit = 0;
+	int at_true_bol = 1;
+	regmatch_t pmatch[10];
+
+ again:
+	if (!opt->fixed) {
+		regex_t *exp = &p->regexp;
+		hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
+			       pmatch, 0);
+	}
+	else {
+		hit = !fixmatch(p->pattern, bol, pmatch);
+	}
+
+	if (hit && opt->word_regexp) {
+		if ((pmatch[0].rm_so < 0) ||
+		    (eol - bol) <= pmatch[0].rm_so ||
+		    (pmatch[0].rm_eo < 0) ||
+		    (eol - bol) < pmatch[0].rm_eo)
+			die("regexp returned nonsense");
+
+		/* Match beginning must be either beginning of the
+		 * line, or at word boundary (i.e. the last char must
+		 * not be a word char).  Similarly, match end must be
+		 * either end of the line, or at word boundary
+		 * (i.e. the next char must not be a word char).
+		 */
+		if ( ((pmatch[0].rm_so == 0 && at_true_bol) ||
+		      !word_char(bol[pmatch[0].rm_so-1])) &&
+		     ((pmatch[0].rm_eo == (eol-bol)) ||
+		      !word_char(bol[pmatch[0].rm_eo])) )
+			;
+		else
+			hit = 0;
+
+		if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
+			/* There could be more than one match on the
+			 * line, and the first match might not be
+			 * strict word match.  But later ones could be!
+			 */
+			bol = pmatch[0].rm_so + bol + 1;
+			at_true_bol = 0;
+			goto again;
+		}
+	}
+	return hit;
+}
+
+static int match_expr_eval(struct grep_opt *opt,
+			   struct grep_expr *x,
+			   char *bol, char *eol)
+{
+	switch (x->node) {
+	case GREP_NODE_ATOM:
+		return match_one_pattern(opt, x->u.atom, bol, eol);
+		break;
+	case GREP_NODE_NOT:
+		return !match_expr_eval(opt, x->u.unary, bol, eol);
+	case GREP_NODE_AND:
+		return (match_expr_eval(opt, x->u.binary.left, bol, eol) &&
+			match_expr_eval(opt, x->u.binary.right, bol, eol));
+	case GREP_NODE_OR:
+		return (match_expr_eval(opt, x->u.binary.left, bol, eol) ||
+			match_expr_eval(opt, x->u.binary.right, bol, eol));
+	}
+	die("Unexpected node type (internal error) %d\n", x->node);
+}
+
+static int match_expr(struct grep_opt *opt, char *bol, char *eol)
+{
+	struct grep_expr *x = opt->pattern_expression;
+	return match_expr_eval(opt, x, bol, eol);
+}
+
+static int match_line(struct grep_opt *opt, char *bol, char *eol)
+{
+	struct grep_pat *p;
+	if (opt->extended)
+		return match_expr(opt, bol, eol);
+	for (p = opt->pattern_list; p; p = p->next) {
+		if (match_one_pattern(opt, p, bol, eol))
+			return 1;
+	}
+	return 0;
+}
+
 static int grep_buffer(struct grep_opt *opt, const char *name,
 		       char *buf, unsigned long size)
 {
@@ -230,46 +473,15 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
 		hunk_mark = "--\n";
 
 	while (left) {
-		regmatch_t pmatch[10];
 		char *eol, ch;
 		int hit = 0;
-		struct grep_pat *p;
 
 		eol = end_of_line(bol, &left);
 		ch = *eol;
 		*eol = 0;
 
-		for (p = opt->pattern_list; p; p = p->next) {
-			if (!opt->fixed) {
-				regex_t *exp = &p->regexp;
-				hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
-					       pmatch, 0);
-			}
-			else {
-				hit = !fixmatch(p->pattern, bol, pmatch);
-			}
+		hit = match_line(opt, bol, eol);
 
-			if (hit && opt->word_regexp) {
-				/* Match beginning must be either
-				 * beginning of the line, or at word
-				 * boundary (i.e. the last char must
-				 * not be alnum or underscore).
-				 */
-				if ((pmatch[0].rm_so < 0) ||
-				    (eol - bol) <= pmatch[0].rm_so ||
-				    (pmatch[0].rm_eo < 0) ||
-				    (eol - bol) < pmatch[0].rm_eo)
-					die("regexp returned nonsense");
-				if (pmatch[0].rm_so != 0 &&
-				    word_char(bol[pmatch[0].rm_so-1]))
-					hit = 0;
-				if (pmatch[0].rm_eo != (eol-bol) &&
-				    word_char(bol[pmatch[0].rm_eo]))
-					hit = 0;
-			}
-			if (hit)
-				break;
-		}
 		/* "grep -v -e foo -e bla" should list lines
 		 * that do not have either, so inversion should
 		 * be done outside.
@@ -363,19 +575,40 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
 	return !!last_hit;
 }
 
-static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name)
+static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
 {
 	unsigned long size;
 	char *data;
 	char type[20];
+	char *to_free = NULL;
 	int hit;
+
 	data = read_sha1_file(sha1, type, &size);
 	if (!data) {
 		error("'%s': unable to read %s", name, sha1_to_hex(sha1));
 		return 0;
 	}
+	if (opt->relative && opt->prefix_length) {
+		static char name_buf[PATH_MAX];
+		char *cp;
+		int name_len = strlen(name) - opt->prefix_length + 1;
+
+		if (!tree_name_len)
+			name += opt->prefix_length;
+		else {
+			if (ARRAY_SIZE(name_buf) <= name_len)
+				cp = to_free = xmalloc(name_len);
+			else
+				cp = name_buf;
+			memcpy(cp, name, tree_name_len);
+			strcpy(cp + tree_name_len,
+			       name + tree_name_len + opt->prefix_length);
+			name = cp;
+		}
+	}
 	hit = grep_buffer(opt, name, data, size);
 	free(data);
+	free(to_free);
 	return hit;
 }
 
@@ -405,6 +638,8 @@ static int grep_file(struct grep_opt *opt, const char *filename)
 		return 0;
 	}
 	close(i);
+	if (opt->relative && opt->prefix_length)
+		filename += opt->prefix_length;
 	i = grep_buffer(opt, filename, data, st.st_size);
 	free(data);
 	return i;
@@ -445,12 +680,14 @@ static int exec_grep(int argc, const char **argv)
 
 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
 {
-	int i, nr, argc, hit, len;
+	int i, nr, argc, hit, len, status;
 	const char *argv[MAXARGS+1];
 	char randarg[ARGBUF];
 	char *argptr = randarg;
 	struct grep_pat *p;
 
+	if (opt->extended || (opt->relative && opt->prefix_length))
+		return -1;
 	len = nr = 0;
 	push_arg("grep");
 	if (opt->fixed)
@@ -535,12 +772,17 @@ static int external_grep(struct grep_opt *opt, const char **paths, int cached)
 		argv[argc++] = name;
 		if (argc < MAXARGS)
 			continue;
-		hit += exec_grep(argc, argv);
+		status = exec_grep(argc, argv);
+		if (0 < status)
+			hit = 1;
 		argc = nr;
 	}
-	if (argc > nr)
-		hit += exec_grep(argc, argv);
-	return 0;
+	if (argc > nr) {
+		status = exec_grep(argc, argv);
+		if (0 < status)
+			hit = 1;
+	}
+	return hit;
 }
 
 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
@@ -569,7 +811,7 @@ static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
 		if (!pathspec_matches(paths, ce->name))
 			continue;
 		if (cached)
-			hit |= grep_sha1(opt, ce->sha1, ce->name);
+			hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
 		else
 			hit |= grep_file(opt, ce->name);
 	}
@@ -584,11 +826,12 @@ static int grep_tree(struct grep_opt *opt, const char **paths,
 	int hit = 0;
 	struct name_entry entry;
 	char *down;
-	char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
+	int tn_len = strlen(tree_name);
+	char *path_buf = xmalloc(PATH_MAX + tn_len + 100);
 
-	if (tree_name[0]) {
-		int offset = sprintf(path_buf, "%s:", tree_name);
-		down = path_buf + offset;
+	if (tn_len) {
+		tn_len = sprintf(path_buf, "%s:", tree_name);
+		down = path_buf + tn_len;
 		strcat(down, base);
 	}
 	else {
@@ -610,7 +853,7 @@ static int grep_tree(struct grep_opt *opt, const char **paths,
 		if (!pathspec_matches(paths, down))
 			;
 		else if (S_ISREG(entry.mode))
-			hit |= grep_sha1(opt, entry.sha1, path_buf);
+			hit |= grep_sha1(opt, entry.sha1, path_buf, tn_len);
 		else if (S_ISDIR(entry.mode)) {
 			char type[20];
 			struct tree_desc sub;
@@ -630,10 +873,9 @@ static int grep_tree(struct grep_opt *opt, const char **paths,
 static int grep_object(struct grep_opt *opt, const char **paths,
 		       struct object *obj, const char *name)
 {
-	if (!strcmp(obj->type, blob_type))
-		return grep_sha1(opt, obj->sha1, name);
-	if (!strcmp(obj->type, commit_type) ||
-	    !strcmp(obj->type, tree_type)) {
+	if (obj->type == OBJ_BLOB)
+		return grep_sha1(opt, obj->sha1, name, 0);
+	if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 		struct tree_desc tree;
 		void *data;
 		int hit;
@@ -646,24 +888,32 @@ static int grep_object(struct grep_opt *opt, const char **paths,
 		free(data);
 		return hit;
 	}
-	die("unable to grep from object of type %s", obj->type);
+	die("unable to grep from object of type %s", typename(obj->type));
 }
 
 static const char builtin_grep_usage[] =
 "git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
 
-int cmd_grep(int argc, const char **argv, char **envp)
+static const char emsg_invalid_context_len[] =
+"%s: invalid context length argument";
+static const char emsg_missing_context_len[] =
+"missing context length argument";
+static const char emsg_missing_argument[] =
+"option requires an argument -%s";
+
+int cmd_grep(int argc, const char **argv, const char *prefix)
 {
 	int hit = 0;
 	int cached = 0;
 	int seen_dashdash = 0;
 	struct grep_opt opt;
-	struct object_list *list, **tail, *object_list = NULL;
-	const char *prefix = setup_git_directory();
+	struct object_array list = { 0, 0, NULL };
 	const char **paths = NULL;
 	int i;
 
 	memset(&opt, 0, sizeof(opt));
+	opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
+	opt.relative = 1;
 	opt.pattern_tail = &opt.pattern_list;
 	opt.regflags = REG_NEWLINE;
 
@@ -674,11 +924,10 @@ int cmd_grep(int argc, const char **argv, char **envp)
 	 * pattern, but then what follows it must be zero or more
 	 * valid refs up to the -- (if exists), and then existing
 	 * paths.  If there is an explicit pattern, then the first
-	 * unrecocnized non option is the beginning of the refs list
+	 * unrecognized non option is the beginning of the refs list
 	 * that continues up to the -- (if exists), and then paths.
 	 */
 
-	tail = &object_list;
 	while (1 < argc) {
 		const char *arg = argv[1];
 		argc--; argv++;
@@ -760,7 +1009,7 @@ int cmd_grep(int argc, const char **argv, char **envp)
 			case 'A': case 'B': case 'C':
 				if (!arg[2]) {
 					if (argc <= 1)
-						usage(builtin_grep_usage);
+						die(emsg_missing_context_len);
 					scan = *++argv;
 					argc--;
 				}
@@ -772,7 +1021,7 @@ int cmd_grep(int argc, const char **argv, char **envp)
 				break;
 			}
 			if (sscanf(scan, "%u", &num) != 1)
-				usage(builtin_grep_usage);
+				die(emsg_invalid_context_len, scan);
 			switch (arg[1]) {
 			case 'A':
 				opt.post_context = num;
@@ -791,7 +1040,7 @@ int cmd_grep(int argc, const char **argv, char **envp)
 			int lno = 0;
 			char buf[1024];
 			if (argc <= 1)
-				usage(builtin_grep_usage);
+				die(emsg_missing_argument, arg);
 			patterns = fopen(argv[1], "r");
 			if (!patterns)
 				die("'%s': %s", argv[1], strerror(errno));
@@ -802,30 +1051,59 @@ int cmd_grep(int argc, const char **argv, char **envp)
 				/* ignore empty line like grep does */
 				if (!buf[0])
 					continue;
-				add_pattern(&opt, strdup(buf), argv[1], ++lno);
+				add_pattern(&opt, strdup(buf), argv[1], ++lno,
+					    GREP_PATTERN);
 			}
 			fclose(patterns);
 			argv++;
 			argc--;
 			continue;
 		}
+		if (!strcmp("--not", arg)) {
+			add_pattern(&opt, arg, "command line", 0, GREP_NOT);
+			continue;
+		}
+		if (!strcmp("--and", arg)) {
+			add_pattern(&opt, arg, "command line", 0, GREP_AND);
+			continue;
+		}
+		if (!strcmp("--or", arg))
+			continue; /* no-op */
+		if (!strcmp("(", arg)) {
+			add_pattern(&opt, arg, "command line", 0, GREP_OPEN_PAREN);
+			continue;
+		}
+		if (!strcmp(")", arg)) {
+			add_pattern(&opt, arg, "command line", 0, GREP_CLOSE_PAREN);
+			continue;
+		}
 		if (!strcmp("-e", arg)) {
 			if (1 < argc) {
-				add_pattern(&opt, argv[1], "-e option", 0);
+				add_pattern(&opt, argv[1], "-e option", 0,
+					    GREP_PATTERN);
 				argv++;
 				argc--;
 				continue;
 			}
-			usage(builtin_grep_usage);
+			die(emsg_missing_argument, arg);
+		}
+		if (!strcmp("--full-name", arg)) {
+			opt.relative = 0;
+			continue;
 		}
-		if (!strcmp("--", arg))
+		if (!strcmp("--", arg)) {
+			/* later processing wants to have this at argv[1] */
+			argv--;
+			argc++;
 			break;
+		}
 		if (*arg == '-')
 			usage(builtin_grep_usage);
 
 		/* First unrecognized non-option token */
 		if (!opt.pattern_list) {
-			add_pattern(&opt, arg, "command line", 0);
+			add_pattern(&opt, arg, "command line", 0,
+				    GREP_PATTERN);
 			break;
 		}
 		else {
@@ -852,12 +1130,9 @@ int cmd_grep(int argc, const char **argv, char **envp)
 		/* Is it a rev? */
 		if (!get_sha1(arg, sha1)) {
 			struct object *object = parse_object(sha1);
-			struct object_list *elem;
 			if (!object)
 				die("bad object %s", arg);
-			elem = object_list_insert(object, tail);
-			elem->name = arg;
-			tail = &elem->next;
+			add_object_array(object, arg, &list);
 			continue;
 		}
 		if (!strcmp(arg, "--")) {
@@ -874,24 +1149,31 @@ int cmd_grep(int argc, const char **argv, char **envp)
 			verify_filename(prefix, argv[j]);
 	}
 
-	if (i < argc)
+	if (i < argc) {
 		paths = get_pathspec(prefix, argv + i);
+		if (opt.prefix_length && opt.relative) {
+			/* Make sure we do not get outside of paths */
+			for (i = 0; paths[i]; i++)
+				if (strncmp(prefix, paths[i], opt.prefix_length))
+					die("git-grep: cannot generate relative filenames containing '..'");
+		}
+	}
 	else if (prefix) {
 		paths = xcalloc(2, sizeof(const char *));
 		paths[0] = prefix;
 		paths[1] = NULL;
 	}
 
-	if (!object_list)
+	if (!list.nr)
 		return !grep_cache(&opt, paths, cached);
 
 	if (cached)
 		die("both --cached and trees are given.");
 
-	for (list = object_list; list; list = list->next) {
+	for (i = 0; i < list.nr; i++) {
 		struct object *real_obj;
-		real_obj = deref_tag(list->item, NULL, 0);
-		if (grep_object(&opt, paths, real_obj, list->name))
+		real_obj = deref_tag(list.objects[i].item, NULL, 0);
+		if (grep_object(&opt, paths, real_obj, list.objects[i].name))
 			hit = 1;
 	}
 	return !hit;