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annotate mrjunejune/template_renderer.c @ 267:a78f5986011f

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discover bundled production runtimes Locate Bazel-packaged Copilot and Python binaries by stable suffix instead of hardcoding an external repository prefix. Co-authored-by: Copilot <[email protected]>
author MrJuneJune <me@mrjunejune.com>
date Fri, 07 Aug 2026 12:58:55 -0700
parents 04fee26ecce0
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1 /*
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2 * template_renderer.c — site-owned HTML template renderer for mrjunejune.
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3 *
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4 * Expands one level of {{/path}} include tokens found in HTML templates.
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5 * File I/O is done with standard C fopen/fread so that tests can point
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6 * the renderer at any root without depending on Seobeo server state.
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7 */
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8
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9 #include "mrjunejune/template_renderer.h"
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10
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11 #include "dowa/dowa.h"
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12 #include "seobeo/seobeo.h"
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13
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17
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18 /* Default matches the path Seobeo_Web_Server_Start_On receives in main.c. */
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19 static char g_src_root[512] = "mrjunejune/src";
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20
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21 void Mjj_Template_Renderer_Init(const char *src_root)
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22 {
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23 if (!src_root || src_root[0] == '\0')
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24 return;
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25 strncpy(g_src_root, src_root, sizeof(g_src_root) - 1);
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26 g_src_root[sizeof(g_src_root) - 1] = '\0';
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27 }
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28
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29 /* Load a file using the renderer's own root; caller must free() result. */
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30 static char *renderer_load_file(const char *rel_path, size_t *p_size)
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31 {
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32 if (!rel_path)
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33 return NULL;
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34
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35 char full_path[1024];
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36 /* rel_path already starts with '/' when produced by canonical markers
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37 (e.g. "/parts/base_head.html"), so concatenate directly. */
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38 if (rel_path[0] == '/')
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39 snprintf(full_path, sizeof(full_path), "%s%s", g_src_root, rel_path);
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40 else
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41 snprintf(full_path, sizeof(full_path), "%s/%s", g_src_root, rel_path);
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42
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43 FILE *f = fopen(full_path, "rb");
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44 if (!f)
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45 return NULL;
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46
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47 fseek(f, 0, SEEK_END);
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48 long sz = ftell(f);
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49 fseek(f, 0, SEEK_SET);
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50 if (sz < 0)
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51 {
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52 fclose(f);
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53 return NULL;
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54 }
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55
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56 char *buf = (char *)malloc((size_t)sz + 1);
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57 if (!buf)
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58 {
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59 fclose(f);
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60 return NULL;
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61 }
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62
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63 size_t n = fread(buf, 1, (size_t)sz, f);
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64 fclose(f);
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65 buf[n] = '\0';
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66
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67 if (p_size)
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68 *p_size = n;
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69 return buf;
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70 }
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71
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72 /* Write `len` bytes of `src` to out starting at *p_offset, respecting cap.
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73 Returns FALSE and does a best-effort NUL-terminate on overflow. */
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74 static boolean safe_append(
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75 char *out, size_t cap, size_t *p_offset,
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76 const char *src, size_t len)
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77 {
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78 if (len == 0)
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79 return TRUE;
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80 if (*p_offset + len >= cap)
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81 {
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82 /* Partial write then NUL-terminate. */
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83 size_t avail = (cap > *p_offset + 1) ? (cap - *p_offset - 1) : 0;
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84 if (avail > 0)
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85 memcpy(out + *p_offset, src, avail);
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86 out[cap - 1] = '\0';
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87 return FALSE;
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88 }
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89 memcpy(out + *p_offset, src, len);
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90 *p_offset += len;
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91 return TRUE;
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92 }
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93
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94 boolean Mjj_Template_Render(
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95 char *out, size_t cap, const char *tmpl, Dowa_Arena *arena)
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96 {
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97 if (!out || cap == 0)
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98 return FALSE;
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99 out[0] = '\0';
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100 if (!tmpl)
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101 return FALSE;
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102
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103 size_t offset = 0;
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104 const char *cursor = tmpl;
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105
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106 while (1)
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107 {
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108 const char *open = strstr(cursor, "{{");
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109 if (!open)
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110 break;
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111
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112 const char *close = strstr(open + 2, "}}");
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113 if (!close)
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114 break;
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115
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116 /* Copy text before the token. */
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117 size_t lead = (size_t)(open - cursor);
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118 if (!safe_append(out, cap, &offset, cursor, lead))
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119 return FALSE;
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120
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121 /* Extract include path between {{ and }}. */
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122 size_t name_len = (size_t)(close - (open + 2));
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123 char *include_name = (char *)Dowa_Arena_Allocate(arena, name_len + 1);
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124 if (!include_name)
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125 return FALSE;
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126 memcpy(include_name, open + 2, name_len);
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127 include_name[name_len] = '\0';
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128
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129 /* Load and inline the included file; skip silently if missing. */
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130 size_t inc_size = 0;
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131 char *inc = renderer_load_file(include_name, &inc_size);
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132 Seobeo_Log(SEOBEO_DEBUG,
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133 "[TEMPLATE] include '%s' -> %s (size=%zu)\n",
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134 include_name, inc ? "OK" : "MISSING", inc_size);
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135 if (inc)
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136 {
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137 boolean ok = safe_append(out, cap, &offset, inc, inc_size);
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138 free(inc);
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139 if (!ok)
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140 return FALSE;
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141 }
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142
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143 cursor = close + 2;
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144 }
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145
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146 /* Copy the tail (after the last token, or the whole string if no tokens). */
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147 size_t tail = strlen(cursor);
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148 if (!safe_append(out, cap, &offset, cursor, tail))
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149 return FALSE;
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150
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151 out[offset] = '\0';
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152 return TRUE;
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153 }
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154
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155 boolean Mjj_Template_Render_File(
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156 char *out, size_t cap, const char *path, Dowa_Arena *arena)
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157 {
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158 if (!out || cap == 0)
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159 return FALSE;
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160 out[0] = '\0';
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161
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162 Seobeo_Log(SEOBEO_DEBUG, "[TEMPLATE] loading file '%s'\n", path);
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163
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164 size_t file_size = 0;
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165 char *tmpl = renderer_load_file(path, &file_size);
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166 if (!tmpl)
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167 {
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168 Seobeo_Log(SEOBEO_DEBUG, "[TEMPLATE] file '%s' not found\n", path);
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169 return FALSE;
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170 }
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171
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172 boolean ok = Mjj_Template_Render(out, cap, tmpl, arena);
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173 free(tmpl);
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174 return ok;
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175 }