+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <assert.h>
+#include <vector>
+#include <string>
+
+#include "parse.h"
+
+using namespace std;
+
+vector<string> split_tokens(const string &line)
+{
+ vector<string> ret;
+ string current_token;
+
+ for (size_t i = 0; i < line.size(); ++i) {
+ if (isspace(line[i])) {
+ if (!current_token.empty()) {
+ ret.push_back(current_token);
+ }
+ current_token.clear();
+ } else {
+ current_token.push_back(line[i]);
+ }
+ }
+ if (!current_token.empty()) {
+ ret.push_back(current_token);
+ }
+ return ret;
+}
+
+vector<string> split_lines(const string &str)
+{
+ vector<string> ret;
+ string current_line;
+
+ for (size_t i = 0; i < str.size(); ++i) {
+ // Skip \r if followed by an \n.
+ if (str[i] == '\r' && i < str.size() - 1 && str[i + 1] == '\n') {
+ continue;
+ }
+
+ // End of the current line?
+ if (str[i] == '\n') {
+ if (!current_line.empty()) {
+ ret.push_back(current_line);
+ }
+ current_line.clear();
+ } else {
+ current_line.push_back(str[i]);
+ }
+ }
+ if (!current_line.empty()) {
+ ret.push_back(current_line);
+ }
+ return ret;
+}
+
+vector<ConfigLine> parse_config(const string &filename)
+{
+ vector<ConfigLine> ret;
+
+ FILE *fp = fopen(filename.c_str(), "r");
+ if (fp == NULL) {
+ perror(filename.c_str());
+ exit(1);
+ }
+
+ char buf[4096];
+ while (!feof(fp)) {
+ if (fgets(buf, sizeof(buf), fp) == NULL) {
+ break;
+ }
+
+ // Chop off the string at the first #, \r or \n.
+ buf[strcspn(buf, "#\r\n")] = 0;
+
+ // Remove all whitespace from the end of the string.
+ size_t len = strlen(buf);
+ while (len > 0 && isspace(buf[len - 1])) {
+ buf[--len] = 0;
+ }
+
+ // If the line is now all blank, ignore it.
+ if (len == 0) {
+ continue;
+ }
+
+ vector<string> tokens = split_tokens(buf);
+ assert(!tokens.empty());
+
+ ConfigLine line;
+ line.keyword = tokens[0];
+
+ for (size_t i = 1; i < tokens.size(); ++i) {
+ // foo=bar is a parameter; anything else is an argument.
+ size_t equals_pos = tokens[i].find_first_of('=');
+ if (equals_pos == string::npos) {
+ line.arguments.push_back(tokens[i]);
+ } else {
+ string key = tokens[i].substr(0, equals_pos);
+ string value = tokens[i].substr(equals_pos + 1, string::npos);
+ line.parameters.insert(make_pair(key, value));
+ }
+ }
+
+ ret.push_back(line);
+ }
+
+ fclose(fp);
+ return ret;
+}
+
+int fetch_config_int(const vector<ConfigLine> &config, const string &keyword, int min_limit, int max_limit)
+{
+ bool value_found = false;
+ int value = -1;
+ for (unsigned i = 0; i < config.size(); ++i) {
+ if (config[i].keyword != keyword) {
+ continue;
+ }
+ if (config[i].parameters.size() > 0 ||
+ config[i].arguments.size() != 1) {
+ fprintf(stderr, "ERROR: '%s' takes one argument and no parameters\n", keyword.c_str());
+ exit(1);
+ }
+ value_found = true;
+ value = atoi(config[i].arguments[0].c_str()); // TODO: verify int validity.
+ }
+ if (!value_found) {
+ fprintf(stderr, "ERROR: Missing '%s' statement in config file.\n",
+ keyword.c_str());
+ exit(1);
+ }
+ if (value < min_limit || value > max_limit) {
+ fprintf(stderr, "ERROR: '%s' is set to %d, must be in [%d,%d]\n",
+ keyword.c_str(), value, min_limit, max_limit);
+ exit(1);
+ }
+ return value;
+}