From cbd974f40ecc75a8573d27e890ee34c060372416 Mon Sep 17 00:00:00 2001
From: Ian Moffett <industrial.reformer@gmail.com>
Date: Fri, 12 Apr 2024 20:20:54 -0400
Subject: Initial commit

Signed-off-by: Ian Moffett <industrial.reformer@gmail.com>
---
 .gitignore |  1 +
 Makefile   |  2 ++
 src/mex.c  | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/mex.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e660fd9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bin/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1d0015f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+bin/mex: src/mex.c
+	gcc $^ -o $@
diff --git a/src/mex.c b/src/mex.c
new file mode 100644
index 0000000..2c0af0c
--- /dev/null
+++ b/src/mex.c
@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define LINE_LEN 16
+
+static void
+dump_line(const char *line, size_t len)
+{
+    /* The amount of bytes we write */
+    const uint8_t BYTE_COUNT = 2;
+
+    for (size_t i = 0; i < LINE_LEN; ++i) {
+        /* Add padding if needed */
+        if (i >= (len*BYTE_COUNT)+1) {
+            printf(" ");
+            continue;
+        }
+
+        if (i >= len) {
+            /* Don't print any more bytes */
+            continue;
+        }
+
+        printf("%02X", line[i] & 0xFF);
+        if (((i + 1) % BYTE_COUNT) == 0) {
+            printf(" ");
+        }
+    }
+
+    printf(" ");
+    for (size_t i = 0; i < len; ++i) {
+        if (line[i] > 31 && line[i] < 127) {
+            printf("%c", line[i]);
+        } else {
+            printf(".");
+        }
+    }
+
+    printf("\n");
+}
+
+static void
+dump_file(FILE *fp)
+{
+    char *buf = malloc(LINE_LEN * sizeof(char));
+    ssize_t count;
+    size_t offset = 0;
+
+    for (;;) {
+        count = fread(buf, sizeof(char), LINE_LEN, fp);
+        if (count <= 0) {
+            break;
+        }
+
+        printf("%08X: ", offset);
+        offset += LINE_LEN*2;
+        dump_line(buf, count);
+    }
+
+    free(buf);
+}
+
+int
+main(int argc, char **argv)
+{
+    FILE *fp;
+
+    if (argc < 2 || argc > 2) {
+        printf("Usage: %s <filename>\n", argv[0]);
+        return 1;
+    }
+
+    fp = fopen(argv[1], "rb");
+
+    if (fp == NULL) {
+        perror("fopen");
+        return -1;
+    }
+
+    dump_file(fp);
+    fclose(fp);
+
+    return 0;
+}
-- 
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