From 372eb2647f04c8789679a7fd80a0e91a65e47941 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Thu, 3 Nov 2022 12:55:01 -0400
Subject: Added a column getter

---
 files.c | 9 +++++++++
 files.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/files.c b/files.c
index 22eaed1..0231f21 100644
--- a/files.c
+++ b/files.c
@@ -197,6 +197,15 @@ size_t get_line_number(file_t *f, const char *p)
     return lo; // Return the line number whose line starts closest before p
 }
 
+//
+// Given a pointer, determine which line column it points to.
+//
+size_t get_line_column(file_t *f, const char *p)
+{
+    size_t line_no = get_line_number(f, p);
+    return 1 + (size_t)(p - f->lines[line_no]);
+}
+
 //
 // Return a pointer to the line with the specified line number.
 //
diff --git a/files.h b/files.h
index b32d5a4..358fcd8 100644
--- a/files.h
+++ b/files.h
@@ -28,6 +28,8 @@ void destroy_file(file_t **f);
 __attribute__((pure, nonnull))
 size_t get_line_number(file_t *f, const char *p);
 __attribute__((pure, nonnull))
+size_t get_line_column(file_t *f, const char *p);
+__attribute__((pure, nonnull))
 const char *get_line(file_t *f, size_t line_number);
 
 #endif
-- 
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