Update fileio, add countLine, rewrite read and write file funcs

src/fileio.c

@@ -1,9 +1,8 @@
-#include <stdio.h>
 #include <string.h>
 #include "global.h"
 #include "fileio.h"
 
-#define MAX_ASM_LINE_LENGTH 30
+#define MAX_ASM_LINE_LENGTH 300
 
 int isValidFileFormat(char filename[], char expectedExtension[]){
     char *pointLoc = strrchr(filename, '.');
@@ -16,67 +15,76 @@ int isValidFileFormat(char filename[], char expectedExtension[]){
     return(0);
 }
 
-int writeBinaryFile(word instrs[], char outputFile[], int numInstrs){
-
-    if (!isValidFileFormat(outputFile, "bin")){
-        return(-1);
+void writeBinaryFile(word instrs[], char outputFile[], int numInstrs) {
+    FILE *fp = fopen(outputFile, "wb");
+    if (fp == NULL) {
+        fprintf(stderr, "Error: Could not open file %s\n", outputFile);
+        exit(EXIT_FAILURE);
     }
-
-    FILE *fp; 
     
-    fp = fopen(outputFile, "wb");
-
-    if(fp == NULL){
-        return(-1);
-    }
-
-    fwrite(instrs, 4, sizeof(word) * numInstrs, fp);
+    fwrite(instrs, sizeof(word), numInstrs, fp);
     fclose(fp);
-
-    return(0);
 }
 
-char **readAssemblyFile(char inputFile[]) {
-    if (!isValidFileFormat(inputFile, "s")){
-        return(NULL);
+int countLines(char *filename) {
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        fprintf(stderr, "Error: Could not read file %s\n", filename);
+        exit(EXIT_FAILURE);
     }
 
-    FILE *fp = fopen(inputFile, "r");
+    int count = 0;
+    char c;
 
-    if (fp == NULL){
-        return(NULL);
-    }
-
-    int lineCount = 0;
-    char ch;
-    while ((ch = fgetc(fp)) != EOF)
-    {
-        if (ch == '\n' || ch == '\0')
-        {
-            lineCount++;
+    while ((c = fgetc(file)) != EOF) {
+        if (c == '\n') {
+            count++;
         }
     }
-    
-    char **heap = malloc(sizeof(char *) * lineCount);
 
-    rewind(fp);
-
-    for( int i=0; i<lineCount; i++) {
-
-        char tmp[512];
-
-        // read line into tmp
-        fgets(tmp, MAX_ASM_LINE_LENGTH-1, fp);
-
-        int size = strlen(tmp);
-
-        char *line = malloc(size+1);  // allocate mem for text line
-
-        strcpy(line, tmp);
-
-        heap[i] = line;  // store line pointer
+    return count;
+}
 
+char **readAssemblyFile(char filename[], int lineCount) {
+    FILE *fp = fopen(filename, "r");
+    if (fp == NULL) {
+        fprintf(stderr, "Error: Could not read file %s\n", filename);
+        exit(EXIT_FAILURE);
     }
 
-    return(heap);
+    char **lines = malloc(sizeof(char *) * lineCount + 1);
+    if (lines == NULL) {
+        fprintf(stderr, "Error: Could not allocate memory to store the assembly lines");
+        exit(EXIT_FAILURE);
+    }
+
+    rewind(fp); // Back to the beginning of the file.
+
+    char buffer[MAX_ASM_LINE_LENGTH];
+    int currentLine = 0;
+    
+    while (fgets(buffer, MAX_ASM_LINE_LENGTH, fp) != NULL) {
+        if (buffer[strlen(buffer) - 1] != '\n') {
+            // It was actually longer than the maximum.
+            // NOTE: I believe this must mean that this is a malformed line, so throw an error.
+            fprintf(stderr, "Error: Line %d in the file %s is too long\n", currentLine, filename);
+            exit(EXIT_FAILURE);
+        }
+
+        lines[currentLine] = malloc(strlen(buffer) + 1);
+        if (lines[currentLine] == NULL) {
+            fprintf(stderr, "Error: Could not allocate memory to store the assembly line");
+            exit(EXIT_FAILURE);
+        }
+
+        strcpy(lines[currentLine], buffer);
+        currentLine++;
+    }
+    
+    if (ferror(fp)) {
+        fprintf(stderr, "Error: Could not read file %s", filename);
+        exit(EXIT_FAILURE);
+    }
+
+    return lines;
 }

src/fileio.h

@@ -1,11 +1,13 @@
 #ifndef __FILEIO__
 #define __FILEIO__
+#include <stdio.h>
 #include <stdlib.h>
 #include "global.h"
 
 #define EXIT_FAILURE 1
 
-char **readAssemblyFile(char inputFile[]);
-int writeBinaryFile(word instrs[], char outputFile[], int numInstrs);
+char **readAssemblyFile(char filename[], int lineCount);
+void writeBinaryFile(word instrs[], char outputFile[], int numInstrs);
+int countLines(char *filename);
 
 #endif