first commit

xim/xcb-util/src/atoms.c

@@ -0,0 +1,87 @@
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/* Rely on vasprintf (GNU extension) instead of vsnprintf if
+   possible... */
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include <xcb/xcb.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include "xcb_atom.h"
+
+#ifndef __has_attribute
+# define __has_attribute(x) 0  /* Compatibility with older compilers. */
+#endif
+
+#if __has_attribute(__format__)                                         \
+    || defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)
+__attribute__((__format__(__printf__,1,2)))
+#endif
+static char *makename(const char *fmt, ...)
+{
+	char *ret;
+	int n;
+	va_list ap;
+
+#ifndef HAVE_VASPRINTF
+	char *np;
+	int size = 64;
+
+	/* First allocate 'size' bytes, should be enough usually */
+	if((ret = malloc(size)) == NULL)
+		return NULL;
+
+	while(1)
+	{
+		va_start(ap, fmt);
+		n = vsnprintf(ret, size, fmt, ap);
+		va_end(ap);
+
+		if(n < 0)
+			return NULL;
+
+		if(n < size)
+			return ret;
+
+		size = n + 1;
+		if((np = realloc(ret, size)) == NULL)
+		{
+			free(ret);
+			return NULL;
+		}
+
+		ret = np;
+	}
+#else
+	va_start(ap, fmt);
+	n = vasprintf(&ret, fmt, ap);
+	va_end(ap);
+
+	if(n < 0)
+		return NULL;
+
+	return ret;
+#endif
+}
+
+char *xcb_atom_name_by_screen(const char *base, uint8_t screen)
+{
+	return makename("%s_S%u", base, screen);
+}
+
+char *xcb_atom_name_by_resource(const char *base, uint32_t resource)
+{
+	return makename("%s_R%08X", base, resource);
+}
+
+char *xcb_atom_name_unique(const char *base, uint32_t id)
+{
+	if(base)
+		return makename("%s_U%u", base, id);
+	else
+		return makename("U%u", id);
+}