C++-ify it some more, begin readfile

src/graph.cpp

@@ -1,22 +1,59 @@
 #include <cstdlib>
 #include "graph.hpp"
 
-int graph_reduce(struct adjmatrix *graph) {
+/* reducible:
+      Perform the graph reduction algorithm on the adjacency matrix to detect deadlocks
+      This algorithm is described in section 5.2 of the Zybook
+      (!THIS MODIFIES THE GRAPH!)
+   @params: none, uses class-internal data
+   @returns:
+      bool:
+         false if graph is not reducible (deadlock)
+         true if graph is reducible (no deadlock)
+*/
+bool graph::reducible() {
    // TODO: Implement a function which checks if a process is blocked
    // TODO: Use that function to implement the graph reduction algorithm
    //? Make sure when reducing the graph, you don't try to delete the
-   return 0;
+   return false;
 }
 
-int knot_detect(struct adjmatrix *graph)  {
-   return 0;
+/* knotted:
+      Perform the knot detection algorithm on the adjacency matrix to detect deadlocks
+      (!THIS MODIFIES THE GRAPH!)
+   @params: none, uses class-internal data
+   @returns:
+      int:
+         true if graph is knotted (deadlock)
+         false if graph is not (no deadlock)
+*/
+bool graph::knotted()  {
+   return false;
 }
 
-int destroy_adjmatrix(struct adjmatrix *matrix) {
-   for (int i = 0; i < matrix->num_processes + matrix->num_resources; i++) {
-      free(matrix->matrix[i]);
+graph::graph (const int processes, const int resources) {
+   num_processes = processes;
+   num_resources = resources;
+   matrix.x = processes + resources;
+   matrix.y = matrix.x;
+   matrix.data = new int*[matrix.x];
+   for (int x = 0; x < matrix.x; x++) {
+      matrix.data[x] = new int[matrix.y];
    }
-   free(matrix->matrix);
-   free(matrix->resource_counts);
-   return 0;
+}
+
+graph::~graph() {
+   /* clean up the 2D matrix */
+   if (matrix.data)  {
+      if (matrix.x || matrix.y) {
+         // delete y axes
+         for (int x = 0; x < matrix.x; x++) {
+            delete matrix.data[x];
+         }
+         // delete x axis
+         delete matrix.data;
+         matrix.x = 0; matrix.y = 0;
+      }
+   }
+   free(resource_counts);
 }

src/main.cpp

@@ -1,9 +1,10 @@
 /* +-------------+---------+-----------------------+
-   | John Breaux | jab0910 | JohnBreaux@my.unt.edu | //TODO put your name here
+   | John Breaux | jab0910 | JohnBreaux@my.unt.edu |
+   |             |         |                       | //TODO put your names here
    +-------------+---------+-----------------------+
    |              Created  2022-04-16              |
    +-----------------------------------------------+  */
-#include <cstdio>      // printf
+#include <string>
 #include "graph.hpp"      // Graph reduction/Knot detection, struct adjmatrix
 #include "read_input.hpp" //TODO: Read input in the associated C file, and provide an interface to that function here
 
@@ -12,16 +13,15 @@ int main(int argc, char** argv) {
    // TODO: Grab file name from args
    //? Command line argument structure?
    //? Other flags? What other features should this have?
-   char* filename = NULL;
+   if (argc < 2) return 1;
+   std::string filename = argv[1];
 
    //TODO: Implement reading from a file
-   struct adjmatrix *graph;
-   read_file(filename, graph);
+   read_file(filename);
 
 
    // TODO: Implement graph reduction and/or knot detection
 
    // TODO: Destroy the graph created by read_file
-   destroy_adjmatrix(graph);
    return 0;
 }

src/read_input.cpp

@@ -1,39 +1,58 @@
 //TODO: Include C file IO header (stdio.h? Whatever it is)
-#include <cstdio>
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <regex>
 #include "graph.hpp"      // struct adjmatrix
 #include "read_input.hpp" // read_input
 
 #define MAX_LINE_LEN 1024
 
+// Vector of regices
+std::vector<std::regex> patterns = {
+   //* A line starting with a % is a comment, and should be skipped
+   //* A blank line should be skipped
+   //* A line starting with `num_processes=` contains the number of processes
+   std::regex("^.*(num_processes)\\s*=\\s*(\\d+).*"),
+   //* A line starting with `num_resources=` contains the number of resources
+   std::regex("^.*(num_resources)\\s*=\\s*(\\d+)"),
+   //* A line containing comma-separated values should be returned as-is, for manual disassembly
+   std::regex("^([0-9, ]+)")
+};
+
 // TODO: Implement reading from a file
-int read_file(char *filename, struct adjmatrix *graph) {
-   // TODO: Open file with name filename as read-only
-   FILE *f = fopen(filename, "r");
+void read_file(std::string filename) {
+   // Open file with name filename as read-only
+   std::fstream f; f.open(filename, f.in);
    // TODO: Check for file IO errors (I might have a solution for that in another project)
 
    int num_processes = 0, num_resources = 0;
-   char line[MAX_LINE_LEN]; // Lines can be no more than 1KB in size, a sensible limitation
-   while (!feof(f)) {
-      //* A line starting with a % is a comment, and should be skipped
-      // if %:
-         continue;
-      //* A blank line should be skipped
-      // if blank:
-         continue;
-      //* A line starting with `num_processes=` contains the number of processes
-      //if "num_processes":
-         num_processes = 0; // TODO: Read file
-      //* A line starting with `num_resources=` contains the number of resources
-      //if "num_resources":
-         num_resources = 0;
-      // TODO: create graph 'object' here
-      //* A line containing num_resources numbers follows, indicating the number of each resource
-      //* Resources are comma-separated, so there can never be more than 1/2 as many as max line length
-         int resource_counts[MAX_LINE_LEN/2];
-      //* A comma-separated, newline-separated adjacency matrix with which to reduce
+   std::vector<int> rescount;
+   std::vector<std::vector<int>> matrix;
+   std::string line; // Lines can be no more than 1KB in size, a sensible limitation
+   while (!f.eof()) {
+      std::getline (f, line);
+      std::smatch res;
+      // Iterate over each pattern, and grab the associated data
+      for (auto pattern: patterns) {
+         if (std::regex_search (line, res, pattern)) {
+            // get the pattern type, value
+            std::string type = res.format("$1"), value = res.format("$2");
+            // Handle the pattern
+            if (type == "num_processes") { num_processes = std::stoi(value); } else
+            if (type == "num_resources") { num_resources = std::stoi(value); } else
+            if (type.length()/2 <= num_resources) {
+               // This is the resource count structure
 
+            }
+            break;
+         }
+      }
    }
 
-   // TODO: Close file
+   // Close file
+   f.close();
    // TODO: Check for file IO errors (Shouldn't be any)
+   return;
 }