3 files changed, 64 insertions, 21 deletions

diff --git a/src/lib/core/include/utils.h b/src/lib/core/include/utils.h
index b405b2a..583a8b8 100644
--- a/src/lib/core/include/utils.h
+++ b/src/lib/core/include/utils.h
@@ -419,4 +419,41 @@ int gen_file_extension_str(char *filename, const char *extension);
 char *remove_extras(char *s);
 
 void debug_hexdump(char *data, int len);
+
+/**
+ * Realloc helper
+ *
+ * @code{.c}
+ * #include <stdio.h>
+ * #include <stdlib.h>
+ * #include <string.h>
+ * #include "utils.h"
+ *
+ * int main(int argc, char *argv[]) {
+ *     size_t sz = 10;
+ *     char *data = calloc(sz, sizeof(*data));
+ *
+ *     // populate data
+ *     strncat(data, "/path/to/", sz - 1);
+ *
+ *     // Double the allocation size for data
+ *     if (grow(sz * 2, &sz, &data)) {
+ *         // memory error
+ *     }
+ *
+ *     // sz is now 20
+ *     strncat(data, "filename", sz - 1 - strlen(data));
+ *
+ *     puts(data);
+ *     // output: "/path/to/filename"
+ * }
+ * @endcode
+ *
+ * @param size_new increase by `size_new` bytes
+ * @param size_orig address of variable containing the original allocation size (modified)
+ * @param data address to write data
+ * @return 0 on success
+ * @return -1 on error
+ */
+int grow(size_t size_new, size_t *size_orig, char **data);
 #endif //STASIS_UTILS_H
diff --git a/src/lib/core/template.c b/src/lib/core/template.c
index ba45a5a..68d20c9 100644
--- a/src/lib/core/template.c
+++ b/src/lib/core/template.c
@@ -137,23 +137,6 @@ struct tplfunc_frame *tpl_getfunc(char *key) {
     return result;
 }
 
-static int grow(size_t z, size_t *output_bytes, char **output) {
-    if (z >= *output_bytes) {
-        size_t new_size = *output_bytes + z + 1;
-        SYSDEBUG("template output buffer new size: %zu\n", new_size);
-
-        char *tmp = realloc(*output, new_size);
-        if (!tmp) {
-            perror("realloc failed");
-            return -1;
-        } else if (tmp != *output) {
-            *output = tmp;
-        }
-        *output_bytes = new_size;
-    }
-    return 0;
-}
-
 char *tpl_render(char *str) {
     if (!str) {
         return NULL;
diff --git a/src/lib/core/utils.c b/src/lib/core/utils.c
index a9c9ea5..89d0baa 100644
--- a/src/lib/core/utils.c
+++ b/src/lib/core/utils.c
@@ -892,10 +892,11 @@ int gen_file_extension_str(char *filename, const char *extension) {
     return replace_text(ext_orig, ext_orig, extension, 0);
 }
 
+#define DEBUG_HEXDUMP_FMT_BYTES 6
 #define DEBUG_HEXDUMP_ADDR_MAXLEN 20
 #define DEBUG_HEXDUMP_BYTES_MAXLEN (16 * 3 + 2)
 #define DEBUG_HEXDUMP_ASCII_MAXLEN (16 + 1)
-#define DEBUG_HEXDUMP_OUTPUT_MAXLEN (DEBUG_HEXDUMP_ADDR_MAXLEN + DEBUG_HEXDUMP_BYTES_MAXLEN + DEBUG_HEXDUMP_ASCII_MAXLEN + 1)
+#define DEBUG_HEXDUMP_OUTPUT_MAXLEN (DEBUG_HEXDUMP_FMT_BYTES + DEBUG_HEXDUMP_ADDR_MAXLEN + DEBUG_HEXDUMP_BYTES_MAXLEN + DEBUG_HEXDUMP_ASCII_MAXLEN + 1)
 
 void debug_hexdump(char *data, int len) {
     int count = 0;
@@ -936,10 +937,32 @@ void debug_hexdump(char *data, int len) {
         // Add group padding
         strcat(bytes, " ");
     }
-    int padding = 16 - count;
+    const int padding = 16 - count;
     for (int i = 0; i < padding; i++) {
         strcat(bytes, "   ");
     }
-    sprintf(output, "%s | %s | %s", addr, bytes, ascii);
+    snprintf(output, 6 + sizeof(addr) + sizeof(bytes) + sizeof(ascii), "%s | %s | %s", addr, bytes, ascii);
     puts(output);
-}
\ No newline at end of file
+}
+
+int grow(const size_t size_new, size_t *size_orig, char **data) {
+    if (!*data) {
+        return 0;
+    }
+    if (size_new >= *size_orig) {
+        const size_t new_size = *size_orig + size_new + 1;
+        SYSDEBUG("template data buffer new size: %zu\n", new_size);
+
+        char *tmp = realloc(*data, new_size);
+        if (!tmp) {
+            perror("realloc failed");
+            return -1;
+        }
+        if (tmp != *data) {
+            *data = tmp;
+        }
+        *size_orig = new_size;
+    }
+    return 0;
+}
+