Move dupcat out into its own file, and add dupstr.

Also a handy #define to replace all those tedious castings of NULL.

1 files changed, 35 insertions, 0 deletions

diff --git a/dupstr.c b/dupstr.c
new file mode 100644
index 0000000..d3a5f53
--- /dev/null
+++ b/dupstr.c
@@ -0,0 +1,35 @@
+#include <stdarg.h>
+#include <string.h>
+
+#include "memory.h"
+#include "dupstr.h"
+
+char *dupcat(const char *str, ...)
+{
+    va_list ap;
+    const char *p;
+    char *out, *outp;
+    size_t len;
+
+    len = 1;
+    va_start(ap, str);
+    for (p = str; p; p = va_arg(ap, const char *))
+        len += strlen(p);
+    va_end(ap);
+
+    out = snewn(len, char);
+    outp = out;
+    va_start(ap, str);
+    for (p = str; p; p = va_arg(ap, const char *)) {
+        strcpy(outp, p);
+        outp += strlen(p);
+    }
+    va_end(ap);
+
+    return out;
+}
+
+char *dupstr(const char *str)
+{
+    return dupcat(str, (const char *)NULL);
+}