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  2+                    GNU GENERAL PUBLIC LICENSE
  3+                       Version 3, 29 June 2007
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561+section 13, concerning interaction through a network will apply to the
562+combination as such.
563+
564+  14. Revised Versions of this License.
565+
566+  The Free Software Foundation may publish revised and/or new versions of
567+the GNU General Public License from time to time.  Such new versions will
568+be similar in spirit to the present version, but may differ in detail to
569+address new problems or concerns.
570+
571+  Each version is given a distinguishing version number.  If the
572+Program specifies that a certain numbered version of the GNU General
573+Public License "or any later version" applies to it, you have the
574+option of following the terms and conditions either of that numbered
575+version or of any later version published by the Free Software
576+Foundation.  If the Program does not specify a version number of the
577+GNU General Public License, you may choose any version ever published
578+by the Free Software Foundation.
579+
580+  If the Program specifies that a proxy can decide which future
581+versions of the GNU General Public License can be used, that proxy's
582+public statement of acceptance of a version permanently authorizes you
583+to choose that version for the Program.
584+
585+  Later license versions may give you additional or different
586+permissions.  However, no additional obligations are imposed on any
587+author or copyright holder as a result of your choosing to follow a
588+later version.
589+
590+  15. Disclaimer of Warranty.
591+
592+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
593+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
594+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
595+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
596+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
597+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
598+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
599+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
600+
601+  16. Limitation of Liability.
602+
603+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
604+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
605+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
606+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
607+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
608+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
609+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
610+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
611+SUCH DAMAGES.
612+
613+  17. Interpretation of Sections 15 and 16.
614+
615+  If the disclaimer of warranty and limitation of liability provided
616+above cannot be given local legal effect according to their terms,
617+reviewing courts shall apply local law that most closely approximates
618+an absolute waiver of all civil liability in connection with the
619+Program, unless a warranty or assumption of liability accompanies a
620+copy of the Program in return for a fee.
621+
622+                     END OF TERMS AND CONDITIONS
623+
624+            How to Apply These Terms to Your New Programs
625+
626+  If you develop a new program, and you want it to be of the greatest
627+possible use to the public, the best way to achieve this is to make it
628+free software which everyone can redistribute and change under these terms.
629+
630+  To do so, attach the following notices to the program.  It is safest
631+to attach them to the start of each source file to most effectively
632+state the exclusion of warranty; and each file should have at least
633+the "copyright" line and a pointer to where the full notice is found.
634+
635+    <one line to give the program's name and a brief idea of what it does.>
636+    Copyright (C) <year>  <name of author>
637+
638+    This program is free software: you can redistribute it and/or modify
639+    it under the terms of the GNU General Public License as published by
640+    the Free Software Foundation, either version 3 of the License, or
641+    (at your option) any later version.
642+
643+    This program is distributed in the hope that it will be useful,
644+    but WITHOUT ANY WARRANTY; without even the implied warranty of
645+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
646+    GNU General Public License for more details.
647+
648+    You should have received a copy of the GNU General Public License
649+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
650+
651+Also add information on how to contact you by electronic and paper mail.
652+
653+  If the program does terminal interaction, make it output a short
654+notice like this when it starts in an interactive mode:
655+
656+    <program>  Copyright (C) <year>  <name of author>
657+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
658+    This is free software, and you are welcome to redistribute it
659+    under certain conditions; type `show c' for details.
660+
661+The hypothetical commands `show w' and `show c' should show the appropriate
662+parts of the General Public License.  Of course, your program's commands
663+might be different; for a GUI interface, you would use an "about box".
664+
665+  You should also get your employer (if you work as a programmer) or school,
666+if any, to sign a "copyright disclaimer" for the program, if necessary.
667+For more information on this, and how to apply and follow the GNU GPL, see
668+<https://www.gnu.org/licenses/>.
669+
670+  The GNU General Public License does not permit incorporating your program
671+into proprietary programs.  If your program is a subroutine library, you
672+may consider it more useful to permit linking proprietary applications with
673+the library.  If this is what you want to do, use the GNU Lesser General
674+Public License instead of this License.  But first, please read
675+<https://www.gnu.org/licenses/why-not-lgpl.html>.
676
677

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3d09136
--- /dev/null
+++ b/Makefile

  1@@ -0,0 +1,10 @@
  2+CC=cc
  3+CFLAGS=-Wall -Wextra -Werror -pedantic
  4+CCHECK=-I. -x c - -fsyntax-only
  5+
  6+install:
  7+	mkdir -p /usr/local/include/
  8+	sudo cp src/orb.h /usr/local/include/
  9+
 10+check: src/orb.h
 11+	@printf '#define ORB_IMPL\n#include "%s"' "$^" | $(CC) $(CFLAGS) $(CCHECK)
 12
 13

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1d8d653
--- /dev/null
+++ b/README.md

  1@@ -0,0 +1,11 @@
  2+# orb
  3+
  4+Multi-purpose module system
  5+
  6+## Installation
  7+
  8+```
  9+git clone git@soophie.de:/srv/git/orb
 10+cd orb
 11+sudo make install
 12+```
 13
 14

diff --git a/src/orb.h b/src/orb.h
new file mode 100644
index 0000000..9860981
--- /dev/null
+++ b/src/orb.h

  1@@ -0,0 +1,119 @@
  2+#pragma once
  3+
  4+#include <stddef.h>
  5+#include <stdbool.h>
  6+
  7+#define ORB_RC_INIT ((orb_rc_t) { .code = 0, .is_fatal = false })
  8+#define ORB_OK ORB_RC_INIT
  9+
 10+#define ORB_MODULE(module) { \
 11+  orb_module_run(module, DUC_OUT); \
 12+}
 13+
 14+#define ORB_MODULE_DEF(type, param_list) { \
 15+  orb_module_t module = orb_module_create(&type, param_list); \
 16+  ORB_MODULE(&module) \
 17+}
 18+
 19+typedef struct {
 20+  int code;
 21+  bool is_fatal;
 22+} orb_rc_t;
 23+
 24+typedef struct orb_module orb_module_t;
 25+
 26+typedef struct {
 27+  size_t size;
 28+  orb_rc_t (*init)(orb_module_t *self);
 29+  orb_rc_t (*fetch)(orb_module_t *self);
 30+  orb_rc_t (*render)(orb_module_t *self, void *out);
 31+  void (*cleanup)(orb_module_t *self);
 32+} orb_module_type_t;
 33+
 34+struct orb_module {
 35+  const orb_module_type_t *type;
 36+  void *param_list;
 37+  void *data;
 38+};
 39+
 40+typedef struct {
 41+  void *out;
 42+  orb_module_t *module;
 43+  orb_rc_t rc;
 44+} orb_ctx_t;
 45+
 46+orb_rc_t ORB_ERR(int code);
 47+orb_rc_t ORB_FATAL(int code);
 48+orb_ctx_t orb_ctx_create(void *out);
 49+orb_module_t orb_module_create(const orb_module_type_t *type, void *param_list);
 50+void orb_module_run(orb_module_t *self, orb_ctx_t *ctx);
 51+
 52+#ifdef ORB_IMPL
 53+
 54+#include <stdlib.h>
 55+
 56+orb_rc_t ORB_ERR(int code) {
 57+  return (orb_rc_t) { .code = code, .is_fatal = false };
 58+}
 59+
 60+orb_rc_t ORB_FATAL(int code) {
 61+  return (orb_rc_t) { .code = code, .is_fatal = true };
 62+}
 63+
 64+orb_ctx_t orb_ctx_create(void *out) {
 65+  return (orb_ctx_t) {
 66+    .out = out,
 67+    .module = NULL,
 68+    .rc = ORB_RC_INIT,
 69+  };
 70+}
 71+
 72+orb_module_t orb_module_create(const orb_module_type_t *type, void *param_list) {
 73+  return (orb_module_t) {
 74+    .type = type,
 75+    .param_list = param_list,
 76+    .data = NULL,
 77+  };
 78+}
 79+
 80+static void _orb_module_init(orb_module_t *self) {
 81+  if (self->type->size == 0) return;
 82+  self->data = calloc(1, self->type->size);
 83+}
 84+
 85+static void _orb_module_cleanup(orb_module_t *self) {
 86+  if (self->data) {
 87+    free(self->data);
 88+    self->data = NULL;
 89+  }
 90+}
 91+
 92+void orb_module_run(orb_module_t *self, orb_ctx_t *ctx) {
 93+  orb_ctx_t sub_ctx = {
 94+    .out = ctx->out,
 95+    .module = self,
 96+    .rc = ORB_RC_INIT,
 97+  };
 98+  _orb_module_init(self);
 99+  if (self->type->init) {
100+    sub_ctx.rc = self->type->init(self);
101+    if (sub_ctx.rc.is_fatal) goto cleanup;
102+  }
103+  if (self->type->fetch) {
104+    sub_ctx.rc = self->type->fetch(self);
105+    if (sub_ctx.rc.is_fatal) goto cleanup;
106+  }
107+  if (self->type->render) {
108+    orb_rc_t rc = self->type->render(self, &sub_ctx);
109+    if (rc.code != 0) sub_ctx.rc = rc;
110+    if (sub_ctx.rc.is_fatal) goto cleanup;
111+  }
112+  cleanup:
113+  if (self->type->cleanup) {
114+    self->type->cleanup(self);
115+  }
116+  _orb_module_cleanup(self);
117+  ctx->rc = sub_ctx.rc;
118+}
119+
120+#endif // ORB_IMPL
121
122