From 972845e2ecba5a46e33ad25934399d50bd63bdca Mon Sep 17 00:00:00 2001
From: Jacob McDonnell <jacob@jacobmcdonnell.com>
Date: Sun, 5 Apr 2026 21:40:09 -0400
Subject: feat: Function to write tags by themselves

Added a function to write tags by themselves as a shorthand since
writing tags only is useful.
---
 example/main          | Bin 0 -> 50808 bytes
 example/main.c        |   4 ++--
 example/main.o        | Bin 0 -> 2960 bytes
 example/test.mat      | Bin 320 -> 320 bytes
 include/matfile.h     |   1 +
 src/libMatfile.a      | Bin 0 -> 2600 bytes
 src/libMatfile.so.1.1 | Bin 0 -> 33824 bytes
 src/matfile.c         |  14 +++++++++++++-
 src/matfile.o         | Bin 0 -> 2336 bytes
 9 files changed, 16 insertions(+), 3 deletions(-)
 create mode 100755 example/main
 create mode 100644 example/main.o
 create mode 100644 src/libMatfile.a
 create mode 100755 src/libMatfile.so.1.1
 create mode 100644 src/matfile.o

diff --git a/example/main b/example/main
new file mode 100755
index 0000000..6bab08a
Binary files /dev/null and b/example/main differ
diff --git a/example/main.c b/example/main.c
index ef7e0dd..15ac62e 100644
--- a/example/main.c
+++ b/example/main.c
@@ -70,7 +70,7 @@ void write_int_array(FILE *fp) {
     array.type = miMATRIX;
     array.size = 80;
 
-    fwrite((void *)&array, 1, sizeof(array), fp);
+    write_tag(fp, array);
     write_data(fp, flags_data);
     write_data(fp, dim_data);
     write_small_data(fp, name);
@@ -113,7 +113,7 @@ void write_double_array(FILE *fp) {
     array.type = miMATRIX;
     array.size = 96;
 
-    fwrite((void *)&array, 1, sizeof(array), fp);
+    write_tag(fp, array);
     write_data(fp, flags_data);
     write_data(fp, dim_data);
     write_data(fp, name);
diff --git a/example/main.o b/example/main.o
new file mode 100644
index 0000000..e564b93
Binary files /dev/null and b/example/main.o differ
diff --git a/example/test.mat b/example/test.mat
index 45738ab..a733ddb 100644
Binary files a/example/test.mat and b/example/test.mat differ
diff --git a/include/matfile.h b/include/matfile.h
index b92cd3a..6f062b1 100644
--- a/include/matfile.h
+++ b/include/matfile.h
@@ -91,6 +91,7 @@ typedef struct {
 } mArrayFlags_t;
 
 bool write_header(FILE *file);
+bool write_tag(FILE *file, mTag_t tag);
 bool write_data(FILE *file, mData_t data);
 bool write_small_data(FILE *file, mSmallData_t data);
 
diff --git a/src/libMatfile.a b/src/libMatfile.a
new file mode 100644
index 0000000..89a3b80
Binary files /dev/null and b/src/libMatfile.a differ
diff --git a/src/libMatfile.so.1.1 b/src/libMatfile.so.1.1
new file mode 100755
index 0000000..a09e26d
Binary files /dev/null and b/src/libMatfile.so.1.1 differ
diff --git a/src/matfile.c b/src/matfile.c
index c6da630..85af901 100644
--- a/src/matfile.c
+++ b/src/matfile.c
@@ -32,8 +32,16 @@ bool write_header(FILE *file) {
     return (status == sizeof(header));
 }
 
+bool write_tag(FILE *file, mTag_t tag) {
+    if (file == NULL) {
+        return false;
+    }
+
+    return (fwrite((const void *)&tag, 1, sizeof(tag), file) == sizeof(tag));
+}
+
 bool write_data(FILE *file, const mData_t data) {
-    if (data.data == NULL) {
+    if (data.data == NULL || file == NULL) {
         return false;
     }
 
@@ -51,6 +59,10 @@ bool write_data(FILE *file, const mData_t data) {
 }
 
 bool write_small_data(FILE *file, const mSmallData_t data) {
+    if (file == NULL) {
+        return false;
+    }
+
     const size_t w = fwrite((const void *)&data, 1, sizeof(data), file);
 
     return (w == sizeof(data));
diff --git a/src/matfile.o b/src/matfile.o
new file mode 100644
index 0000000..e437d4d
Binary files /dev/null and b/src/matfile.o differ
-- 
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