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ductape

Static template generator for C
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  1                    GNU GENERAL PUBLIC LICENSE
  2                       Version 3, 29 June 2007
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  559but the special requirements of the GNU Affero General Public License,
  560section 13, concerning interaction through a network will apply to the
  561combination as such.
  562
  563  14. Revised Versions of this License.
  564
  565  The Free Software Foundation may publish revised and/or new versions of
  566the GNU General Public License from time to time.  Such new versions will
  567be similar in spirit to the present version, but may differ in detail to
  568address new problems or concerns.
  569
  570  Each version is given a distinguishing version number.  If the
  571Program specifies that a certain numbered version of the GNU General
  572Public License "or any later version" applies to it, you have the
  573option of following the terms and conditions either of that numbered
  574version or of any later version published by the Free Software
  575Foundation.  If the Program does not specify a version number of the
  576GNU General Public License, you may choose any version ever published
  577by the Free Software Foundation.
  578
  579  If the Program specifies that a proxy can decide which future
  580versions of the GNU General Public License can be used, that proxy's
  581public statement of acceptance of a version permanently authorizes you
  582to choose that version for the Program.
  583
  584  Later license versions may give you additional or different
  585permissions.  However, no additional obligations are imposed on any
  586author or copyright holder as a result of your choosing to follow a
  587later version.
  588
  589  15. Disclaimer of Warranty.
  590
  591  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
  592APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
  593HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
  594OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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  600  16. Limitation of Liability.
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  602  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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  610SUCH DAMAGES.
  611
  612  17. Interpretation of Sections 15 and 16.
  613
  614  If the disclaimer of warranty and limitation of liability provided
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  620
  621                     END OF TERMS AND CONDITIONS
  622
  623            How to Apply These Terms to Your New Programs
  624
  625  If you develop a new program, and you want it to be of the greatest
  626possible use to the public, the best way to achieve this is to make it
  627free software which everyone can redistribute and change under these terms.
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  629  To do so, attach the following notices to the program.  It is safest
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  634    <one line to give the program's name and a brief idea of what it does.>
  635    Copyright (C) <year>  <name of author>
  636
  637    This program is free software: you can redistribute it and/or modify
  638    it under the terms of the GNU General Public License as published by
  639    the Free Software Foundation, either version 3 of the License, or
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  641
  642    This program is distributed in the hope that it will be useful,
  643    but WITHOUT ANY WARRANTY; without even the implied warranty of
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  649
  650Also add information on how to contact you by electronic and paper mail.
  651
  652  If the program does terminal interaction, make it output a short
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  655    <program>  Copyright (C) <year>  <name of author>
  656    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  657    This is free software, and you are welcome to redistribute it
  658    under certain conditions; type `show c' for details.
  659
  660The hypothetical commands `show w' and `show c' should show the appropriate
  661parts of the General Public License.  Of course, your program's commands
  662might be different; for a GUI interface, you would use an "about box".
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  664  You should also get your employer (if you work as a programmer) or school,
  665if any, to sign a "copyright disclaimer" for the program, if necessary.
  666For more information on this, and how to apply and follow the GNU GPL, see
  667<https://www.gnu.org/licenses/>.
  668
  669  The GNU General Public License does not permit incorporating your program
  670into proprietary programs.  If your program is a subroutine library, you
  671may consider it more useful to permit linking proprietary applications with
  672the library.  If this is what you want to do, use the GNU Lesser General
  673Public License instead of this License.  But first, please read
  674<https://www.gnu.org/licenses/why-not-lgpl.html>.
  

• src/ductape.h [new file]

  1// Copyright (C) 2026 Sophie Sitzler
  2//
  3// This program is free software: you can redistribute it and/or modify
  4// it under the terms of the GNU General Public License as published by
  5// the Free Software Foundation, either version 3 of the License, or
  6// (at your option) any later version.
  7//
  8// This program is distributed in the hope that it will be useful,
  9// but WITHOUT ANY WARRANTY; without even the implied warranty of
  10// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11// GNU General Public License for more details.
  12//
  13// You should have received a copy of the GNU General Public License
  14// along with this program. If not, see <https://www.gnu.org/licenses/>.
  15
  16// @file ductape.h
  17
  18#ifndef _SO_DUCTAPE_H
  19#define _SO_DUCTAPE_H
  20
  21#include <stdio.h>
  22#include <stdlib.h>
  23
  24// @type duc_render_fn_t
  25typedef int (*duc_render_fn_t)(void *, void *);
  26
  27// @struct duc_templref_t
  28typedef struct {
  29  duc_render_fn_t fn;
  30  void *data;
  31  const char *dl_path;
  32} duc_templref_t;
  33
  34// @macro __TEMPLDEF_MACRO
  35// @internal
  36#define __TEMPLDEF_MACRO($name, $params) \
  37  typedef struct { \
  38    $params \
  39  } $name##_t; \
  40  \
  41  typedef void (*$name##_fn_t)(void *, $name##_t *); \
  42  \
  43  int $name##_render(void *out, void *ctx) { \
  44    char *path = getenv("DUC_BUILDPATH"); \
  45    if (path == NULL) { \
  46      path = "./"; \
  47    } \
  48    char dl_path[strlen(path) + strlen(__DUC_UID_##$name) + 4]; \
  49    snprintf(dl_path, sizeof(dl_path), "%s%s.so", path, __DUC_UID_##$name); \
  50    void *handle = dlopen(dl_path, RTLD_NOW); \
  51    if (!handle) { \
  52      fprintf(stderr, "%s\n", dlerror()); \
  53      return 1; \
  54    } \
  55    const size_t *hash = (size_t *) dlsym(handle, "__DUC_SIG_HASH_" #$name); \
  56    if (__DUC_SIG_HASH_##$name != *hash) { \
  57      fprintf(stderr, "Invalid signature hash! (%llx != %llx)\n", __DUC_SIG_HASH_##$name, *hash); \
  58      return 1; \
  59    } \
  60    $name##_fn_t fn = ($name##_fn_t) dlsym(handle, "duc_" #$name); \
  61    char *err = dlerror(); \
  62    if (err) { \
  63      fprintf(stderr, "%s\n", err); \
  64      dlclose(handle); \
  65      return 1; \
  66    } \
  67    fn(out, ($name##_t *) ctx); \
  68    dlclose(handle); \
  69    return 0; \
  70  }
  71
  72// @macro __TEMPLDEF_HEADER
  73// @internal
  74#define __TEMPLDEF_HEADER($name, $params) \
  75  __TEMPLDEF_MACRO($name, $params) \
  76  \
  77  void duc_##$name(void *out, $name##_t *ctx);
  78
  79// @macro TEMPLDEF
  80#define TEMPLDEF($name, $params) \
  81  __TEMPLDEF_MACRO($name, $params) \
  82  \
  83  void duc_##$name(void *out, $name##_t *ctx) {
  84
  85// @macro ENDTEMPL
  86#define ENDTEMPL }
  87
  88// @macro TEMPLBIND
  89#define TEMPLBIND($name, $data, $dl_path) \
  90  (duc_templref_t) { \
  91    .fn = $name##_render, \
  92    .data = $data, \
  93    .dl_path = $dl_path, \
  94  },
  95
  96// @macro INCLUDE
  97#define INCLUDE($name) ctx->$name.fn(duc, ctx->$name.data, ctx->$name.dl_path);
  98
  99#endif // _SO_DUC_H