so://phie

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  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 ctl.h
 17
 18#ifndef _SO_CTL_H
 19#define _SO_CTL_H
 20
 21#include <stdio.h>
 22#include <stdlib.h>
 23
 24// @type ctl_render_fn_t
 25typedef int (*ctl_render_fn_t)(void *, void *, const char *);
 26
 27// @struct ctl_templref_t
 28typedef struct {
 29  ctl_render_fn_t fn;
 30  void *data;
 31  const char *dl_path;
 32} ctl_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 $name##_render(void *out, void *ctx) { \
 44    char *path = getenv("CTL_BUILDPATH"); \
 45    if (path == NULL) { \
 46      path = "./"; \
 47    } \
 48    char dl_path[strlen(path) + strlen(__CTL_UID_##$name) + 4]; \
 49    snprintf(dl_path, sizeof(dl_path), "%s%s.so", path, __CTL_UID_##$name); \
 50    void *handle = dlopen(dl_path, RTLD_NOW); \
 51    if (!handle) { \
 52      fprintf(stderr, "%s\n", dlerror()); \
 53      return 1; \
 54    } \
 55    const size_t *hash = (size_t *) dlsym(handle, "__CTL_SIG_HASH_" #$name); \
 56    if (__CTL_SIG_HASH_##$name != *hash) { \
 57      fprintf(stderr, "Invalid signature hash! (%llx != %llx)\n", __CTL_SIG_HASH_##$name, *hash); \
 58      return 1; \
 59    } \
 60    $name##_fn_t fn = ($name##_fn_t) dlsym(handle, "ctl_" #$name); \
 61    char *err = dlerror(); \
 62    if (err) { \
 63      fprintf(stderr, "%s\n", err); \
 64      dlclose(handle); \
 65      return 1; \
 66    } \
 67    fn(out, ($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, $params) \
 76  \
 77  void ctl_##$name(void *out, $name##_t *ctx);
 78
 79// @macro TEMPLDEF
 80#define TEMPLDEF($name, $params) \
 81  __TEMPLDEF_MACRO($name, $params) \
 82  \
 83  void ctl_##$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  (ctl_templref_t) { \
 91    .fn = $name##_render, \
 92    .data = $data, \
 93    .dl_path = $dl_path, \
 94  },
 95
 96// @macro INCLUDE
 97#define INCLUDE($name) ctx->$name.fn(ctl, ctx->$name.data, ctx->$name.dl_path);
 98
 99#endif // _SO_CTL_H