kc3-lang/pkgconf/libpkgconf/personality.c

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• Hash : c581e24a
  Author :
  Date : 2022-02-10T19:46:19
  

  personality: use an unsigned to track initializations
  
  Instead of a bool. The latter will result in de-initing leaving the
  library unable to init again, which works out for the cli, but is
  problematic for other consumers (meson++ and muon).
  
  v2: - Add docs that the functions are not thread safe
  

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• libpkgconf/personality.c

• /*
   * personality.c
   * libpkgconf cross-compile personality database
   *
   * Copyright (c) 2018 pkgconf authors (see AUTHORS).
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * This software is provided 'as is' and without any warranty, express or
   * implied.  In no event shall the authors be liable for any damages arising
   * from the use of this software.
   */
  
  #include <libpkgconf/config.h>
  #include <libpkgconf/stdinc.h>
  #include <libpkgconf/libpkgconf.h>
  
  #ifdef _WIN32
  #	define strcasecmp _stricmp
  #endif
  
  /*
   * Increment each time the default personality is inited, decrement each time
   * it's deinited. Whenever it is 0, then the deinit frees the personality. In
   * that case an additional call to init will create it anew.
   */
  static unsigned default_personality_init = 0;
  
  static pkgconf_cross_personality_t default_personality = {
  	.name = "default",
  #ifdef _WIN32
  	.want_default_static = true,
  	.want_default_pure = true,
  #endif
  };
  
  static inline void
  build_default_search_path(pkgconf_list_t* dirlist)
  {
  #ifdef _WIN32
  	char namebuf[MAX_PATH];
  	char outbuf[MAX_PATH];
  	char *p;
  
  	int sizepath = GetModuleFileName(NULL, namebuf, sizeof namebuf);
  	char * winslash;
  	namebuf[sizepath] = '\0';
  	while ((winslash = strchr (namebuf, '\\')) != NULL)
  	{
  		*winslash = '/';
  	}
  	p = strrchr(namebuf, '/');
  	if (p == NULL)
  		pkgconf_path_split(PKG_DEFAULT_PATH, dirlist, true);
  
  	*p = '\0';
  	pkgconf_strlcpy(outbuf, namebuf, sizeof outbuf);
  	pkgconf_strlcat(outbuf, "/", sizeof outbuf);
  	pkgconf_strlcat(outbuf, "../lib/pkgconfig", sizeof outbuf);
  	pkgconf_path_add(outbuf, dirlist, true);
  	pkgconf_strlcpy(outbuf, namebuf, sizeof outbuf);
  	pkgconf_strlcat(outbuf, "/", sizeof outbuf);
  	pkgconf_strlcat(outbuf, "../share/pkgconfig", sizeof outbuf);
  	pkgconf_path_add(outbuf, dirlist, true);
  #elif __HAIKU__
  	char **paths;
  	size_t count;
  	if (find_paths(B_FIND_PATH_DEVELOP_LIB_DIRECTORY, "pkgconfig", &paths, &count) == B_OK) {
  		for (size_t i = 0; i < count; i++)
  			pkgconf_path_add(paths[i], dirlist, true);
  		free(paths);
  		paths = NULL;
  	}
  	if (find_paths(B_FIND_PATH_DATA_DIRECTORY, "pkgconfig", &paths, &count) == B_OK) {
  		for (size_t i = 0; i < count; i++)
  			pkgconf_path_add(paths[i], dirlist, true);
  		free(paths);
  		paths = NULL;
  	}
  #else
  	pkgconf_path_split(PKG_DEFAULT_PATH, dirlist, true);
  #endif
  }
  
  /*
   * !doc
   *
   * .. c:function:: const pkgconf_cross_personality_t *pkgconf_cross_personality_default(void)
   *
   *    Returns the default cross-compile personality.
   *
   *    Not thread safe.
   *
   *    :rtype: pkgconf_cross_personality_t*
   *    :return: the default cross-compile personality
   */
  pkgconf_cross_personality_t *
  pkgconf_cross_personality_default(void)
  {
  	if (default_personality_init) {
  		++default_personality_init;
  		return &default_personality;
  	}
  
  	build_default_search_path(&default_personality.dir_list);
  
  	pkgconf_path_split(SYSTEM_LIBDIR, &default_personality.filter_libdirs, false);
  	pkgconf_path_split(SYSTEM_INCLUDEDIR, &default_personality.filter_includedirs, false);
  
  	++default_personality_init;
  	return &default_personality;
  }
  
  /*
   * !doc
   *
   * .. c:function:: void pkgconf_cross_personality_deinit(pkgconf_cross_personality_t *)
   *
   *    Decrements the count of default cross personality instances.
   *
   *    Not thread safe.
   *
   *    :rtype: void
   */
  void
  pkgconf_cross_personality_deinit(pkgconf_cross_personality_t *personality)
  {
      if (--default_personality_init == 0) {
          pkgconf_path_free(&personality->dir_list);
          pkgconf_path_free(&personality->filter_libdirs);
          pkgconf_path_free(&personality->filter_includedirs);
      }
  }
  
  #ifndef PKGCONF_LITE
  static bool
  valid_triplet(const char *triplet)
  {
  	const char *c = triplet;
  
  	for (; *c; c++)
  		if (!isalnum(*c) && *c != '-' && *c != '_')
  			return false;
  
  	return true;
  }
  
  typedef void (*personality_keyword_func_t)(pkgconf_cross_personality_t *p, const char *keyword, const size_t lineno, const ptrdiff_t offset, char *value);
  typedef struct {
  	const char *keyword;
  	const personality_keyword_func_t func;
  	const ptrdiff_t offset;
  } personality_keyword_pair_t;
  
  static void
  personality_bool_func(pkgconf_cross_personality_t *p, const char *keyword, const size_t lineno, const ptrdiff_t offset, char *value)
  {
  	(void) keyword;
  	(void) lineno;
  
  	bool *dest = (bool *)((char *) p + offset);
  	*dest = strcasecmp(value, "true") || strcasecmp(value, "yes") || *value == '1';
  }
  
  static void
  personality_copy_func(pkgconf_cross_personality_t *p, const char *keyword, const size_t lineno, const ptrdiff_t offset, char *value)
  {
  	(void) keyword;
  	(void) lineno;
  
  	char **dest = (char **)((char *) p + offset);
  	*dest = strdup(value);
  }
  
  static void
  personality_fragment_func(pkgconf_cross_personality_t *p, const char *keyword, const size_t lineno, const ptrdiff_t offset, char *value)
  {
  	(void) keyword;
  	(void) lineno;
  
  	pkgconf_list_t *dest = (pkgconf_list_t *)((char *) p + offset);
  	pkgconf_path_split(value, dest, false);
  }
  
  /* keep in alphabetical order! */
  static const personality_keyword_pair_t personality_keyword_pairs[] = {
  	{"DefaultSearchPaths", personality_fragment_func, offsetof(pkgconf_cross_personality_t, dir_list)},
  	{"SysrootDir", personality_copy_func, offsetof(pkgconf_cross_personality_t, sysroot_dir)},
  	{"SystemIncludePaths", personality_fragment_func, offsetof(pkgconf_cross_personality_t, filter_includedirs)},
  	{"SystemLibraryPaths", personality_fragment_func, offsetof(pkgconf_cross_personality_t, filter_libdirs)},
  	{"Triplet", personality_copy_func, offsetof(pkgconf_cross_personality_t, name)},
  	{"WantDefaultPure", personality_bool_func, offsetof(pkgconf_cross_personality_t, want_default_pure)},
  	{"WantDefaultStatic", personality_bool_func, offsetof(pkgconf_cross_personality_t, want_default_static)},
  };
  
  static int
  personality_keyword_pair_cmp(const void *key, const void *ptr)
  {
  	const personality_keyword_pair_t *pair = ptr;
  	return strcasecmp(key, pair->keyword);
  }
  
  static void
  personality_keyword_set(pkgconf_cross_personality_t *p, const size_t lineno, const char *keyword, char *value)
  {
  	const personality_keyword_pair_t *pair = bsearch(keyword,
  		personality_keyword_pairs, PKGCONF_ARRAY_SIZE(personality_keyword_pairs),
  		sizeof(personality_keyword_pair_t), personality_keyword_pair_cmp);
  
  	if (pair == NULL || pair->func == NULL)
  		return;
  
  	pair->func(p, keyword, lineno, pair->offset, value);
  }
  
  static const pkgconf_parser_operand_func_t personality_parser_ops[256] = {
  	[':'] = (pkgconf_parser_operand_func_t) personality_keyword_set
  };
  
  static void personality_warn_func(void *p, const char *fmt, ...) PRINTFLIKE(2, 3);
  
  static void
  personality_warn_func(void *p, const char *fmt, ...)
  {
  	va_list va;
  
  	(void) p;
  
  	va_start(va, fmt);
  	vfprintf(stderr, fmt, va);
  	va_end(va);
  }
  
  static pkgconf_cross_personality_t *
  load_personality_with_path(const char *path, const char *triplet)
  {
  	char pathbuf[PKGCONF_ITEM_SIZE];
  	FILE *f;
  	pkgconf_cross_personality_t *p;
  
  	/* if triplet is null, assume that path is a direct path to the personality file */
  	if (triplet != NULL)
  		snprintf(pathbuf, sizeof pathbuf, "%s/%s.personality", path, triplet);
  	else
  		pkgconf_strlcpy(pathbuf, path, sizeof pathbuf);
  
  	f = fopen(pathbuf, "r");
  	if (f == NULL)
  		return NULL;
  
  	p = calloc(sizeof(pkgconf_cross_personality_t), 1);
  	if (triplet != NULL)
  		p->name = strdup(triplet);
  	pkgconf_parser_parse(f, p, personality_parser_ops, personality_warn_func, pathbuf);
  
  	return p;
  }
  
  /*
   * !doc
   *
   * .. c:function:: pkgconf_cross_personality_t *pkgconf_cross_personality_find(const char *triplet)
   *
   *    Attempts to find a cross-compile personality given a triplet.
   *
   *    :rtype: pkgconf_cross_personality_t*
   *    :return: the default cross-compile personality
   */
  pkgconf_cross_personality_t *
  pkgconf_cross_personality_find(const char *triplet)
  {
  	pkgconf_list_t plist = PKGCONF_LIST_INITIALIZER;
  	pkgconf_node_t *n;
  	pkgconf_cross_personality_t *out = NULL;
  
  	out = load_personality_with_path(triplet, NULL);
  	if (out != NULL)
  		return out;
  
  	if (!valid_triplet(triplet))
  		return NULL;
  
  	pkgconf_path_split(PERSONALITY_PATH, &plist, true);
  
  	PKGCONF_FOREACH_LIST_ENTRY(plist.head, n)
  	{
  		pkgconf_path_t *pn = n->data;
  
  		out = load_personality_with_path(pn->path, triplet);
  		if (out != NULL)
  			goto finish;
  	}
  
  finish:
  	pkgconf_path_free(&plist);
  	return out != NULL ? out : pkgconf_cross_personality_default();
  }
  #endif
  

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