1 files changed, 48 insertions, 0 deletions
diff --git a/utils/dupcat.c b/utils/dupcat.c
new file mode 100644
index 00000000..ddd6599e
--- /dev/null
+++ b/utils/dupcat.c
@@ -0,0 +1,48 @@
+/*
+ * Implementation function behind dupcat() in misc.h.
+ *
+ * This function is called with an arbitrary number of 'const char *'
+ * parameters, of which the last one is a null pointer. The wrapper
+ * macro puts on the null pointer itself, so normally callers don't
+ * have to.
+ */
+
+#include <string.h>
+#include <stdarg.h>
+
+#include "defs.h"
+#include "misc.h"
+
+char *dupcat_fn(const char *s1, ...)
+{
+    int len;
+    char *p, *q, *sn;
+    va_list ap;
+
+    len = strlen(s1);
+    va_start(ap, s1);
+    while (1) {
+        sn = va_arg(ap, char *);
+        if (!sn)
+            break;
+        len += strlen(sn);
+    }
+    va_end(ap);
+
+    p = snewn(len + 1, char);
+    strcpy(p, s1);
+    q = p + strlen(p);
+
+    va_start(ap, s1);
+    while (1) {
+        sn = va_arg(ap, char *);
+        if (!sn)
+            break;
+        strcpy(q, sn);
+        q += strlen(q);
+    }
+    va_end(ap);
+
+    return p;
+}
+