c-programming

commit d2ab03772cfccbac849b1e2ad8e4f7353be94d2d
parent da2f30b9ab22f5277a82998c1c0247d058a2fcb1
Author: Andrew Laack <andrew@laack.co>
Date:   Thu, 13 Nov 2025 16:10:09 -0600

Reading CSVs for ML

Diffstat:
R
ml/count-columns.c -> ml/old/count-columns.c
 | 
0

R
ml/count-columns.h -> ml/old/count-columns.h
 | 
0

R
ml/dynamic-array.c -> ml/old/dynamic-array.c
 | 
0

R
ml/dynamic-array.h -> ml/old/dynamic-array.h
 | 
0

A
ml/old/read-csv.c
 | 
38
++++++++++++++++++++++++++++++++++++++
M
ml/read-csv.c
 | 
77
++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------

6 files changed, 94 insertions(+), 21 deletions(-)
diff --git a/ml/count-columns.c b/ml/old/count-columns.c
diff --git a/ml/count-columns.h b/ml/old/count-columns.h
diff --git a/ml/dynamic-array.c b/ml/old/dynamic-array.c
diff --git a/ml/dynamic-array.h b/ml/old/dynamic-array.h
diff --git a/ml/old/read-csv.c b/ml/old/read-csv.c
@@ -0,0 +1,38 @@
+// this is wrong; please do this by counting the characters then allocating.
+#include <stdio.h>
+#include "count-columns.h"
+#include "dynamic-array.h"
+#include <stdlib.h>
+
+int main(int argc, char ** argv){
+    
+    char* filename = argv[1];
+    int columns = countColumns(filename);
+    printf("columns: %d\n", columns);
+
+    int size = 0;
+    char data [size];
+    FILE* fp = fopen(filename, "r");
+    DynamicArray* first = makeArr(data,size);
+    DynamicArray* second = makeArr(data,size);
+
+    char c;
+    while ((c = getc(fp)) != ','){
+        arrAppend(first, c);
+    }
+
+    while ((c = getc(fp)) != '\n'){
+        arrAppend(second, c);
+    }
+
+    printArr(first);
+    printf("\n");
+    printArr(second);
+    printf("\n");
+
+    // todo: cleanup allocations
+
+    fclose(fp);
+
+    return 0;
+}
diff --git a/ml/read-csv.c b/ml/read-csv.c
@@ -1,35 +1,70 @@
 #include <stdio.h>
-#include "count-columns.h"
-#include "dynamic-array.h"
 #include <stdlib.h>
 
-int main(int argc, char ** argv){
-    
-    char* filename = argv[1];
-    int columns = countColumns(filename);
-    printf("columns: %d\n", columns);
+#define TRUE 1
+#define FALSE 0
 
-    int size = 0;
-    char data [size];
-    FILE* fp = fopen(filename, "r");
-    DynamicArray* first = makeArr(data,size);
-    DynamicArray* second = makeArr(data,size);
 
+int getRows(char* fileName){
     char c;
-    while ((c = getc(fp)) != ','){
-        arrAppend(first, c);
+    int count = 0;
+    FILE* fp = fopen(fileName, "r");
+    while((c = getc(fp)) != EOF){
+        if(c == '\n'){
+            count += 1;
+        }
     }
+    return count + 1;
 
-    while ((c = getc(fp)) != '\n'){
-        arrAppend(second, c);
+}
+
+// there's more too it than just this
+// not sure how \n characters work.
+// not sure how to handle cases where escaping for \" charcter.
+
+int getColumns(char* fileName){
+    char c;
+    int count = 0;
+    int escaped = FALSE;
+
+    FILE* fp = fopen(fileName, "r");
+    c = getc(fp);
+    while(c != EOF && c != '\n'){
+        if(c == ',' && escaped == FALSE){
+            count += 1;
+        }
+        else if (c == '"'){
+            if (escaped == TRUE){
+                escaped = FALSE;
+            }
+            else{
+                escaped = TRUE;
+            }
+        }
+        c = getc(fp);
     }
 
-    printArr(first);
-    printf("\n");
-    printArr(second);
-    printf("\n");
+    if(escaped == TRUE){
+        return -1;
+    }
+    return count + 1;
+}
+
+
+int main(int argc, char** argv){
+
+    char* fileName = argv[1];
+    FILE* fp = fopen(fileName, "r");
+
+    char** allRecords;
+    int rows = getRows(fileName);
+    int columns = getColumns(fileName);
+
+    if (columns == -1){
+        printf("Non-matching quotations in first row.");
+    }
 
-    // todo: cleanup allocations
+    printf("Rows: %d, Columns: %d\n", rows, columns);
 
     fclose(fp);