Import xwrite(), cstr_set(), resolve_..._template()

From degesch and json-rpc-shell.

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014 - 2018, Přemysl Eric Janouch <p@janouch.name>
+Copyright (c) 2014 - 2020, Přemysl Eric Janouch <p@janouch.name>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted.

cmake/FindNcursesw.cmake

@@ -1,17 +1,17 @@
 # Public Domain
 
 find_package (PkgConfig REQUIRED)
-pkg_check_modules (NCURSESW QUIET ncursesw)
+pkg_check_modules (Ncursesw QUIET ncursesw)
 
 # OpenBSD doesn't provide a pkg-config file
-set (required_vars NCURSESW_LIBRARIES)
-if (NOT NCURSESW_FOUND)
-	find_library (NCURSESW_LIBRARIES NAMES ncursesw)
-	find_path (NCURSESW_INCLUDE_DIRS ncurses.h)
-	list (APPEND required_vars NCURSESW_INCLUDE_DIRS)
-endif (NOT NCURSESW_FOUND)
+set (required_vars Ncursesw_LIBRARIES)
+if (NOT Ncursesw_FOUND)
+	find_library (Ncursesw_LIBRARIES NAMES ncursesw)
+	find_path (Ncursesw_INCLUDE_DIRS ncurses.h)
+	list (APPEND required_vars Ncursesw_INCLUDE_DIRS)
+endif (NOT Ncursesw_FOUND)
 
 include (FindPackageHandleStandardArgs)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS (NCURSESW DEFAULT_MSG ${required_vars})
+FIND_PACKAGE_HANDLE_STANDARD_ARGS (Ncursesw DEFAULT_MSG ${required_vars})
 
-mark_as_advanced (NCURSESW_LIBRARIES NCURSESW_INCLUDE_DIRS)
+mark_as_advanced (Ncursesw_LIBRARIES Ncursesw_INCLUDE_DIRS)

cmake/FindUnistring.cmake

@@ -1,10 +1,10 @@
 # Public Domain
 
-find_path (UNISTRING_INCLUDE_DIRS unistr.h)
-find_library (UNISTRING_LIBRARIES NAMES unistring libunistring)
+find_path (Unistring_INCLUDE_DIRS unistr.h)
+find_library (Unistring_LIBRARIES NAMES unistring libunistring)
 
 include (FindPackageHandleStandardArgs)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS (UNISTRING DEFAULT_MSG
-	UNISTRING_INCLUDE_DIRS UNISTRING_LIBRARIES)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS (Unistring DEFAULT_MSG
+	Unistring_INCLUDE_DIRS Unistring_LIBRARIES)
 
-mark_as_advanced (UNISTRING_LIBRARIES UNISTRING_INCLUDE_DIRS)
+mark_as_advanced (Unistring_LIBRARIES Unistring_INCLUDE_DIRS)

liberty.c

@@ -1,7 +1,7 @@
 /*
  * liberty.c: the ultimate C unlibrary
  *
- * Copyright (c) 2014 - 2018, Přemysl Eric Janouch <p@janouch.name>
+ * Copyright (c) 2014 - 2020, Přemysl Eric Janouch <p@janouch.name>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted.
@@ -731,6 +731,21 @@ set_blocking (int fd, bool blocking)
 	return prev;
 }
 
+static bool
+xwrite (int fd, const char *data, size_t len, struct error **e)
+{
+	size_t written = 0;
+	while (written < len)
+	{
+		ssize_t res = write (fd, data + written, len - written);
+		if (res >= 0)
+			written += res;
+		else if (errno != EINTR)
+			return error_set (e, "%s", strerror (errno));
+	}
+	return true;
+}
+
 static void
 xclose (int fd)
 {
@@ -1357,6 +1372,7 @@ struct poller_idle
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
+// The heap could definitely be made faster but we'll prefer simplicity
 struct poller_timers
 {
 	struct poller_timer **heap;         ///< Min-heap of timers
@@ -2672,6 +2688,12 @@ strncasecmp_ascii (const char *a, const char *b, size_t n)
 	return 0;
 }
 
+static bool
+iscntrl_ascii (int c)
+{
+	return (c >= 0 && c < 32) || c == 0x7f;
+}
+
 static bool
 isalpha_ascii (int c)
 {
@@ -2917,6 +2939,13 @@ base64_encode (const void *data, size_t len, struct str *output)
 
 // --- Utilities ---------------------------------------------------------------
 
+static void
+cstr_set (char **s, char *new)
+{
+	free (*s);
+	*s = new;
+}
+
 static void
 cstr_split (const char *s, const char *delimiters, bool ignore_empty,
 	struct strv *out)
@@ -2946,10 +2975,10 @@ cstr_strip_in_place (char *s, const char *stripped_chars)
 }
 
 static void
-cstr_transform (char *s, int (*tolower) (int c))
+cstr_transform (char *s, int (*xform) (int c))
 {
 	for (; *s; s++)
-		*s = tolower (*s);
+		*s = xform (*s);
 }
 
 static char *
@@ -2996,6 +3025,7 @@ iconv_xstrdup (iconv_t conv, char *in, size_t in_len, size_t *out_len)
 
 	char *in_ptr = in;
 	if (in_len == (size_t) -1)
+		// XXX: out_len will be one character longer than the string!
 		in_len = strlen (in) + 1;
 
 	while (iconv (conv, (char **) &in_ptr, &in_len,
@@ -3255,16 +3285,8 @@ resolve_relative_data_filename (const char *filename)
 }
 
 static char *
-resolve_relative_runtime_filename (const char *filename)
+resolve_relative_runtime_filename_finish (struct str path)
 {
-	struct str path = str_make ();
-	const char *runtime_dir = getenv ("XDG_RUNTIME_DIR");
-	if (runtime_dir && *runtime_dir == '/')
-		str_append (&path, runtime_dir);
-	else
-		get_xdg_home_dir (&path, "XDG_DATA_HOME", ".local/share");
-	str_append_printf (&path, "/%s/%s", PROGRAM_NAME, filename);
-
 	// Try to create the file's ancestors;
 	// typically the user will want to immediately create a file in there
 	const char *last_slash = strrchr (path.str, '/');
@@ -3277,6 +3299,41 @@ resolve_relative_runtime_filename (const char *filename)
 	return str_steal (&path);
 }
 
+static char *
+resolve_relative_runtime_filename (const char *filename)
+{
+	struct str path = str_make ();
+	const char *runtime_dir = getenv ("XDG_RUNTIME_DIR");
+	if (runtime_dir && *runtime_dir == '/')
+		str_append (&path, runtime_dir);
+	else
+		get_xdg_home_dir (&path, "XDG_DATA_HOME", ".local/share");
+
+	str_append_printf (&path, "/%s/%s", PROGRAM_NAME, filename);
+	return resolve_relative_runtime_filename_finish (path);
+}
+
+/// This differs from resolve_relative_runtime_filename() in that we expect
+/// the filename to be something like a pattern for mkstemp(), so the resulting
+/// path can reside in a system-wide directory with no risk of a conflict.
+/// However, we have to take care about permissions.  Do we even need this?
+static char *
+resolve_relative_runtime_template (const char *template)
+{
+	struct str path = str_make ();
+	const char *runtime_dir = getenv ("XDG_RUNTIME_DIR");
+	const char *tmpdir = getenv ("TMPDIR");
+	if (runtime_dir && *runtime_dir == '/')
+		str_append_printf (&path, "%s/%s", runtime_dir, PROGRAM_NAME);
+	else if (tmpdir && *tmpdir == '/')
+		str_append_printf (&path, "%s/%s.%d", tmpdir, PROGRAM_NAME, geteuid ());
+	else
+		str_append_printf (&path, "/tmp/%s.%d", PROGRAM_NAME, geteuid ());
+
+	str_append_printf (&path, "/%s", template);
+	return resolve_relative_runtime_filename_finish (path);
+}
+
 static char *
 try_expand_tilde (const char *filename)
 {