added evector.c

libcext/evector.c

@@ -0,0 +1,33 @@
+/* extendible vectors. Icarus Sparry 2006.  Public domain. */
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "cext.h"
+
+#define ERRMSG "Out of memory in cext_evector_attach\n"
+void
+cext_evector_attach(evector_t *v, void *p)
+{
+	++v->size;
+	if (!(v->data = realloc(v->data, v->size * sizeof(void *)))) {
+		write(2,ERRMSG,sizeof(ERRMSG)-1);
+		exit(99);
+	}
+	v->data[v->size-1]=p;
+}
+
+void
+cext_evector_detach(evector_t *v, void *data)
+{
+	void **p = v->data, **end;
+	if (!p) return;
+	for(end=p+v->size-1; p<=end; p++)
+		if (*p == data) {
+			for(; p<end; p++)
+				p[0] = p[1]; /* Could use memmove rather than this loop */
+			*end = nil;
+			--v->size;
+			return;
+		}
+}
+