1 files changed, 66 insertions, 0 deletions
diff --git a/sternenblog/stringutil.c b/sternenblog/stringutil.c
new file mode 100644
index 0000000..44cec9e
--- /dev/null
+++ b/sternenblog/stringutil.c
@@ -0,0 +1,66 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+char nibble_hex(short h) {
+    switch(h) {
+        case 0:
+        case 1:
+        case 2:
+        case 3:
+        case 4:
+        case 5:
+        case 6:
+        case 7:
+        case 8:
+        case 9:
+            return (h + 48);
+        case 10:
+        case 11:
+        case 12:
+        case 13:
+        case 14:
+        case 15:
+            return (h + 55);
+        default:
+            return 0;
+    }
+}
+
+char *catn_alloc(size_t n, ...) {
+    va_list args;
+    size_t pos = 0;
+    char *buffer = NULL;
+    size_t buffer_size = 0;
+    va_start(args, n);
+
+    for(size_t i = 0; i < n; i++) {
+        char *str = va_arg(args, char *);
+        if(str != NULL) {
+            size_t copy_len = strlen(str) + (i + 1 == n ? 1 : 0);
+
+            char *tmp = realloc(buffer, buffer_size + copy_len);
+
+            if(tmp == NULL) {
+                break;
+            } else {
+                buffer = tmp;
+            }
+
+            buffer_size += copy_len;
+            memcpy(buffer + pos, str, copy_len);
+            pos += copy_len;
+        }
+    }
+
+    if(buffer != NULL) {
+        // ensure it's NUL terminated
+        buffer[buffer_size - 1] = '\0';
+    }
+
+    va_end(args);
+
+    return buffer;
+}
+