From 688972df9daa1f80d24feff5c056ab3a66c4eee9 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 7 Nov 2025 18:15:14 -0500
Subject: cal: parse csv tables

---
 sw/cal/csv.go | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 sw/cal/csv.go

(limited to 'sw/cal/csv.go')

diff --git a/sw/cal/csv.go b/sw/cal/csv.go
new file mode 100644
index 0000000..bb5cd01
--- /dev/null
+++ b/sw/cal/csv.go
@@ -0,0 +1,55 @@
+package main
+
+import (
+	"os"
+	"fmt"
+	"io"
+	"strconv"
+	"encoding/csv"
+)
+
+func parseTable(filename string) (map[int32]uint16, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		eprintf("%v\n", err)
+	}
+	defer f.Close()
+
+	tbl := make(map[int32]uint16)
+	rdr := csv.NewReader(f)
+	for {
+		err := parseRow(rdr, tbl)
+		if err == io.EOF {
+			return tbl, nil
+		} else if err != nil {
+			return nil, fmt.Errorf("%s:%v", filename, err)
+		}
+	}
+}
+
+func parseRow(rdr *csv.Reader, tbl map[int32]uint16) error {
+	row, err := rdr.Read()
+	if err != nil {
+		return err
+	}
+	if len(row) != 2 {
+		line, _ := rdr.FieldPos(0)
+		return fmt.Errorf("%d: malformed row", line)
+	}
+	key, err := strconv.ParseInt(row[0], 10, 32)
+	if err != nil {
+		line, col := rdr.FieldPos(0)
+		return fmt.Errorf("%d:%d: %v", line, col, err)
+	}
+	val, err := strconv.ParseUint(row[1], 10, 16)
+	if err != nil {
+		line, col := rdr.FieldPos(1)
+		return fmt.Errorf("%d:%d: %v", line, col, err)
+	}
+	if _, ok := tbl[int32(key)]; ok {
+		line, col := rdr.FieldPos(0)
+		return fmt.Errorf("%d: %d: duplicate key %d", line, col, key)
+	}
+	tbl[int32(key)] = uint16(val)
+	return nil
+}
-- 
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