ok?

main.c

@@ -1,89 +1,124 @@
-#include "record.h"
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 #include <unistd.h>
 
-#define MAX_RECORDS 1000
+#define DEFAULT_NN 10000000
+#define DEFAULT_N 1001
+#define DEFAULT_B 10
 #define END_PROGRAM -1
 #define SUCCESS 0
 #define ERROR -2
 
 void print_usage()
 {
-    printf("Usage: [-f filename] [-h]\n");
     printf("Options:\n");
-    printf("  -f filename\tRead records from file\n");
-    printf("  -h\tShow this help message");
+    printf("  -f [filename]\tRead/Generate records from [filename]\n");
+    printf("  -r\t randomly generate N records, and process them\n");
+    printf("  -N [count]\tSet total number of records, default %d\n", DEFAULT_NN);
+    printf("  -n [count]\tSet blocking factor, default %d\n", DEFAULT_N);
+    printf("  -b [count]\tSet number of buffers, default %d\n", DEFAULT_B);
+    printf("  -h\tShow this help message\n");
 }
 
-// stream is function output
-int process_args(int argc, char** argv, FILE** stream)
+typedef struct
 {
+    FILE* input;
+    bool generate_data;
+    bool manual_input;
+    int N; // number of records in a file
+    int b; // blocking factor
+    int n; // number of buffers
+} options;
+
+// reads args into opts
+int process_args(int argc, char** argv, options* opts)
+{
+    if (opts == NULL) {
+        return ERROR;
+    }
+    opts->input = stdin;
+    opts->generate_data = false;
+    opts->manual_input = false;
+    opts->N = DEFAULT_NN;
+    opts->n = DEFAULT_N;
+    opts->b = DEFAULT_B;
     char* filename = NULL;
     int opt;
-    while ((opt = getopt(argc, argv, "f:h")) != -1) {
+    while ((opt = getopt(argc, argv, "f:N:n:b:rhm")) != -1) {
         switch (opt) {
         case 'f':
             filename = optarg;
             break;
+        case 'r':
+            opts->generate_data = true;
+            break;
+        case 'N':
+            opts->N = atoi(optarg);
+            break;
+        case 'n':
+            opts->n = atoi(optarg);
+            break;
+        case 'b':
+            opts->b = atoi(optarg);
+            break;
+        case 'm':
+            opts->manual_input = true;
         case 'h':
             print_usage();
             return END_PROGRAM;
         case '?':
-            printf("invalid option, terminating\n");
+            fprintf(stderr, "invalid option, terminating\n");
             return ERROR;
         }
     }
-    if (filename != NULL) {
-        printf("%s\n", filename);
-        *stream = fopen(filename, "r");
-        if (!*stream) {
-            fprintf(stderr, "Error: Cannot open file '%s'\n", filename);
-            return END_PROGRAM;
-        }
+    if (opts->manual_input == true && opts->generate_data == true) {
+        fprintf(stderr, "Incompatible arguments: mr, aborting\n");
+        return ERROR;
+    }
+    if (filename == NULL) {
+        fprintf(stderr, "No file specified, aborting\n");
+        return ERROR;
+    }
+    opts->input = fopen(filename, "a+");
+    if (!opts->input) {
+        fprintf(stderr, "Error: Cannot open file '%s'\n", filename);
+        return ERROR;
     }
     return SUCCESS;
 }
 
-void process_input(FILE* input)
+void generate_file(options* opts)
 {
-    record records[MAX_RECORDS];
-    int count = 0;
-    while (count < MAX_RECORDS) {
-        if (read_record(input, &records[count]) != SUCCESS) {
-            break;
-        }
-        count++;
-    }
+}
 
-    printf("\nRead %d records\n", count);
-    qsort(records, count, sizeof(record), compare_records);
-    printf("\nSorted records:\n");
-    for (int i = 0; i < count; i++) {
-        printf("Record %d: ", i);
-        print_record(stdout, &records[i]);
-        printf("\n");
-    }
+void write_file(options* opts)
+{
+}
+
+void sort_file(options* opts)
+{
 }
 
 int main(int argc, char** argv)
 {
-    FILE* input = NULL;
-    if (argc > 1) {
-        int result = process_args(argc, argv, &input);
-        if (result != SUCCESS) {
-            return result;
-        }
-        if (input == NULL) {
-            printf("ok\n");
-        }
+    options opts;
+    if (argc <= 1) {
+        fprintf(stderr, "please specify input args\n");
+        return ERROR;
     }
-    if (input == NULL) {
-        printf("Enter records (format: a_0 a_1 a_2 a_3 a_4 x), or 'q' to quit:\n");
-        input = stdin;
+    int result = process_args(argc, argv, &opts);
+    if (result != SUCCESS) {
+        return result;
     }
-    process_input(input);
-    if (input != stdin) {
-        fclose(input);
+    if (opts.generate_data) {
+        srand(time(0));
+        generate_file(&opts);
     }
+    if (opts.manual_input) {
+        write_file(&opts);
+    }
+    sort_file(&opts);
+    fclose(opts.input);
 }