From 574e79243648debf57a0d92653bd0df83398e772 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Fri, 6 Oct 2017 22:07:52 +0200
Subject: Print all matching definitions in example

---
 src/util/query.cc | 45 ++++++++++++++++++++++++---------------------
 src/util/query.h  |  4 +++-
 2 files changed, 27 insertions(+), 22 deletions(-)

(limited to 'src')

diff --git a/src/util/query.cc b/src/util/query.cc
index a6fdcd3..f210613 100644
--- a/src/util/query.cc
+++ b/src/util/query.cc
@@ -5,40 +5,43 @@
 #include <cstdio>
 #include <cstring>
 
-#include <stdexcept>
-
 namespace dictzip {
 
-std::string get_line_starting_with(
+std::vector<std::string> get_lines_starting_with(
 	const std::string& path, const std::string& substring) {
-	static const auto BUFFER_SIZE = 16*1024;
-
 	FILE* file = std::fopen(path.c_str(), "r");
 
+	if ( !file ) {
+		return std::vector<std::string>{};
+	}
+
 	posix_fadvise(fileno(file), 0, 0, 1);  // FDADVICE_SEQUENTIAL
 
-	char buffer[BUFFER_SIZE + 1];
+	std::vector<std::string> result;
+	char buffer[16*1024 + 1];
 	char* start_of_match = nullptr;
 
-	while( std::size_t bytes_read = std::fread(buffer, sizeof(char), BUFFER_SIZE, file) ) {
-		if ( bytes_read ) {
-			for ( char* p = buffer;
-			      (p = static_cast<char*>(std::memchr(p, '\n', (buffer + bytes_read) - p)));
-			      ++p ) {
-				if ( start_of_match == nullptr ) {
-					if ( std::strncmp(substring.c_str(), p+1, substring.size()) == 0 ) {
-						start_of_match = p+1;
-					}
-				} else {
-					return std::string(start_of_match, p-start_of_match);
-				}
+	while ( std::size_t n = std::fread(buffer,
+	                                   sizeof(char),
+	                                   sizeof(buffer) - 1,
+	                                   file) ) {
+		for ( char* p = buffer;
+			  (p = static_cast<char*>(std::memchr(p, '\n', (buffer + n) - p)));
+			  ++p ) {
+			if ( start_of_match != nullptr ) {
+				result.emplace_back(start_of_match, p - start_of_match);
+				start_of_match = nullptr;
+			}
+
+			if ( std::strncmp(substring.c_str(), p+1, substring.size()) == 0 ) {
+				start_of_match = p+1;
 			}
-		} else {
-			break;
 		}
 	}
 
-	throw std::runtime_error("No match found");
+	std::fclose(file);
+
+	return result;
 }
 
 std::string get_encoded_offset(const std::string& line) {
diff --git a/src/util/query.h b/src/util/query.h
index 3a25206..1c7df36 100644
--- a/src/util/query.h
+++ b/src/util/query.h
@@ -1,10 +1,12 @@
 #pragma once
 
 #include <string>
+#include <vector>
 
 namespace dictzip {
 
-std::string get_line_starting_with(const std::string& path, const std::string& substring);
+std::vector<std::string> get_lines_starting_with(
+	const std::string& path, const std::string& substring);
 
 std::string get_encoded_offset(const std::string& line);
 std::string get_encoded_length(const std::string& line);
-- 
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