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annotate libpam-sys/libpam-sys-test/build.rs @ 128:ad77f2af5ff4 default tip

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Fix `rustc-check-cfg` in `libpam-sys/build.rs`.
author Paul Fisher <paul@pfish.zone>
date Mon, 30 Jun 2025 23:00:53 -0400
parents c77846f3a979
children
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rev   line source
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1 use bindgen::MacroTypeVariation;
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2 use libpam_sys_impls::__pam_impl_enum__;
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3 use proc_macro2::{Group, TokenStream, TokenTree};
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4 use quote::{format_ident, ToTokens};
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5 use std::path::Path;
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6 use std::process::Command;
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7 use std::str::FromStr;
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8 use std::{env, fs};
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9 use syn::{Item, ItemConst, Type, TypePath};
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10
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11 // We're using the macro directly so we can match exhaustively.
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12 __pam_impl_enum__!();
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13
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14 fn main() {
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15 let config = match PamImpl::CURRENT {
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16 PamImpl::LinuxPam => TestConfig {
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17 headers: vec![
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18 "<security/_pam_types.h>",
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19 "<security/pam_appl.h>",
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20 "<security/pam_ext.h>",
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21 "<security/pam_modules.h>",
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22 ],
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23 ignore_consts: vec![
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24 "__LINUX_PAM__",
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25 "__LINUX_PAM_MINOR__",
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26 "PAM_AUTHTOK_RECOVER_ERR",
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27 ],
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28 ..Default::default()
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29 },
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30 PamImpl::OpenPam => TestConfig {
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31 headers: vec![
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32 "<security/pam_types.h>",
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33 "<security/openpam.h>",
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34 "<security/pam_appl.h>",
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35 "<security/pam_constants.h>",
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36 ],
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37 ignore_consts: vec!["OPENPAM_VERSION", "OPENPAM_RELEASE", "PAM_SOEXT"],
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38 ..Default::default()
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39 },
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40 PamImpl::Sun => TestConfig {
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41 headers: vec!["<security/pam_appl.h>", "<security/pam_modules.h>"],
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42 block_headers: vec!["sys/.*"],
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43 ..Default::default()
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44 },
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45 PamImpl::XSso => TestConfig {
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46 headers: vec!["\"xsso_pam_appl.h\""],
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47 ignore_consts: vec!["PAM_CRED_PRELIM_CHECK"],
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48 ..Default::default()
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49 },
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50 };
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51 generate_const_test(&config);
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52 generate_ctest(&config);
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53 }
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54
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55 fn generate_const_test(config: &TestConfig) {
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56 let mut builder = bindgen::Builder::default()
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57 .header_contents("_.h", &config.header_contents())
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58 .merge_extern_blocks(true)
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59 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
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60 .blocklist_type(".*")
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61 .blocklist_function(".*")
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62 .allowlist_var(".*")
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63 .default_macro_constant_type(MacroTypeVariation::Signed);
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64 for hdr in config.block_headers.iter() {
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65 builder = builder.blocklist_file(".*?/".to_owned() + hdr)
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66 }
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67
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68 let generated = builder.generate().unwrap().to_string();
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69 let file = syn::parse_file(&generated).unwrap();
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70 let mut tests = vec![
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71 "use libpam_sys::*;".into(),
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72 "#[allow(deprecated, overflowing_literals)]".into(),
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73 "fn main() {".into(),
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74 format!(
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75 "assert_eq!(PamImpl::CURRENT, PamImpl::{:?});",
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76 PamImpl::CURRENT
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77 ),
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78 ];
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79 tests.extend(
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80 file.items
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81 .iter()
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82 .filter_map(|item| {
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83 if let Item::Const(item) = item {
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84 Some(item)
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85 } else {
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86 None
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87 }
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88 })
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89 .filter(|item| config.should_check_const(item))
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90 .cloned()
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91 .map(|mut item| {
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92 item.ty = Box::new(Type::Path(TypePath {
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93 qself: None,
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94 path: format_ident!("i32").into(),
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95 }));
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96 format!(
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97 "assert_eq!({tokens}, {name});",
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98 tokens = item.expr.to_token_stream(),
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99 name = item.ident
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100 )
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101 }),
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102 );
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103 tests.push("}".into());
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104 let const_test = test_file("constant_test.rs");
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105 fs::write(&const_test, tests.join("\n")).unwrap();
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106 rustfmt(&const_test);
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107 }
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108
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109 fn generate_ctest(config: &TestConfig) {
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110 let mut test = ctest::TestGenerator::new();
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111
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112 for header in config.headers.iter() {
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113 if header.starts_with('"') {
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114 test.include(env::var("CARGO_MANIFEST_DIR").unwrap());
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115 }
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116 test.header(&header[1..header.len() - 1]);
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117 }
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118 // These are opaque structs.
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119 test.skip_struct(|name| matches!(name, "pam_handle" | "AppData"));
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120 test.skip_type(|name| matches!(name, "ConversationCallback" | "CleanupCallback"));
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121 test.type_name(|name, _is_struct, is_union| {
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122 assert!(!is_union); // we scabbin'
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123 match name {
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124 "pam_handle" => "struct pam_handle",
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125 "pam_conv" => "struct pam_conv",
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126 "pam_message" => "struct pam_message",
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127 "pam_response" => "struct pam_response",
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128 "AppData" => "void",
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129 other => other,
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130 }
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131 .into()
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132 });
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133
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134 //
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135 // Welcome to THE HACK ZONE.
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136 //
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137
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138 // Define away constness because the various PAM implementations
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139 // have different const annotations and this will surely drive you crazy.
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140 test.define("const", Some(""));
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141
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142 // Also replace all the `const`s with `mut`s in the ffi.rs file.
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143 let file_contents = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../src/ffi.rs"));
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144 let deconsted_file = test_file("ffi.rs");
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145 remove_consts(file_contents, &deconsted_file);
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146
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147 test.generate(&deconsted_file, "ctest.rs");
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148 }
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149
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150 fn remove_consts(file_contents: &str, out_file: impl AsRef<Path>) {
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151 let deconstified = deconstify(
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152 TokenStream::from_str(file_contents).unwrap(),
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153 &TokenStream::from_str("mut")
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154 .unwrap()
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155 .into_iter()
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156 .next()
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157 .unwrap(),
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158 )
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159 .to_string();
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160 let out_file = out_file.as_ref();
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161 fs::write(out_file, deconstified).unwrap();
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162 rustfmt(out_file)
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163 }
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164
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165 fn rustfmt(file: impl AsRef<Path>) {
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166 let status = Command::new(env!("CARGO"))
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167 .args(["fmt", "--", file.as_ref().to_str().unwrap()])
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168 .status()
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169 .unwrap();
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170 assert!(status.success(), "rustfmt exited with code {status}");
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171 }
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172
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173 fn deconstify(stream: TokenStream, mut_token: &TokenTree) -> TokenStream {
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174 TokenStream::from_iter(stream.into_iter().map(|token| {
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175 match token {
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176 TokenTree::Group(g) => {
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177 TokenTree::Group(Group::new(g.delimiter(), deconstify(g.stream(), mut_token)))
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178 .into_token_stream()
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179 }
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180 TokenTree::Ident(id) if id == "const" => mut_token.into_token_stream(),
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181 other => other.into_token_stream(),
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182 }
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183 }))
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184 }
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185
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186 fn test_file(name: impl AsRef<str>) -> String {
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187 format!("{}/{}", env::var("OUT_DIR").unwrap(), name.as_ref())
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188 }
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189
121
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190 #[derive(Default)]
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191 struct TestConfig {
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192 headers: Vec<&'static str>,
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193 block_headers: Vec<&'static str>,
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194 ignore_consts: Vec<&'static str>,
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195 }
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196
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197 impl TestConfig {
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198 fn header_contents(&self) -> String {
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199 let vec: Vec<_> = self
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200 .headers
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201 .iter()
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202 .map(|h| format!("#include {h}\n"))
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203 .collect();
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204 vec.join("")
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205 }
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206
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207 fn should_check_const(&self, item: &ItemConst) -> bool {
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208 !self
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209 .ignore_consts
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210 .contains(&item.ident.to_string().as_ref())
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211 }
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212 }