X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=common%2Fcommon.c;h=f2fd0b82d62f8ca859a0dbd6c34e46ae8633ae48;hb=68b66a256a54d32992dfefeaad11eea88b7df234;hp=bc22fa5c6a71a25ed32da120d4c70471ff80c2fd;hpb=9009cc24dc1634ba03cbdfe6c37831f8b1ba95d3;p=babeltrace.git

diff --git a/common/common.c b/common/common.c
index bc22fa5c..f2fd0b82 100644
--- a/common/common.c
+++ b/common/common.c
@@ -22,20 +22,78 @@
  * SOFTWARE.
  */
 
+#define BT_LOG_TAG "COMMON"
+#include "logging.h"
+
 #include <unistd.h>
 #include <string.h>
+#include <inttypes.h>
 #include <sys/types.h>
-#include <pwd.h>
+#include <sys/stat.h>
 #include <unistd.h>
-#include <assert.h>
+#include <babeltrace2/assert-internal.h>
+#include <stdarg.h>
 #include <ctype.h>
 #include <glib.h>
-#include <babeltrace/babeltrace-internal.h>
-#include <babeltrace/common-internal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <wchar.h>
+#include <stdbool.h>
+#include <babeltrace2/babeltrace-internal.h>
+#include <babeltrace2/common-internal.h>
+#include <babeltrace2/compat/unistd-internal.h>
+
+#ifndef __MINGW32__
+#include <pwd.h>
+#endif
 
-#define SYSTEM_PLUGIN_PATH	INSTALL_LIBDIR "/babeltrace/plugins"
+#define SYSTEM_PLUGIN_PATH	INSTALL_LIBDIR "/babeltrace2/plugins"
 #define HOME_ENV_VAR		"HOME"
-#define HOME_PLUGIN_SUBPATH	"/.local/lib/babeltrace/plugins"
+#define HOME_PLUGIN_SUBPATH	"/.local/lib/babeltrace2/plugins"
+
+static const char *bt_common_color_code_reset = "";
+static const char *bt_common_color_code_bold = "";
+static const char *bt_common_color_code_fg_default = "";
+static const char *bt_common_color_code_fg_red = "";
+static const char *bt_common_color_code_fg_green = "";
+static const char *bt_common_color_code_fg_yellow = "";
+static const char *bt_common_color_code_fg_blue = "";
+static const char *bt_common_color_code_fg_magenta = "";
+static const char *bt_common_color_code_fg_cyan = "";
+static const char *bt_common_color_code_fg_light_gray = "";
+static const char *bt_common_color_code_bg_default = "";
+static const char *bt_common_color_code_bg_red = "";
+static const char *bt_common_color_code_bg_green = "";
+static const char *bt_common_color_code_bg_yellow = "";
+static const char *bt_common_color_code_bg_blue = "";
+static const char *bt_common_color_code_bg_magenta = "";
+static const char *bt_common_color_code_bg_cyan = "";
+static const char *bt_common_color_code_bg_light_gray = "";
+
+static
+void __attribute__((constructor)) bt_common_color_ctor(void)
+{
+	if (bt_common_colors_supported()) {
+		bt_common_color_code_reset = BT_COMMON_COLOR_RESET;
+		bt_common_color_code_bold = BT_COMMON_COLOR_BOLD;
+		bt_common_color_code_fg_default = BT_COMMON_COLOR_FG_DEFAULT;
+		bt_common_color_code_fg_red = BT_COMMON_COLOR_FG_RED;
+		bt_common_color_code_fg_green = BT_COMMON_COLOR_FG_GREEN;
+		bt_common_color_code_fg_yellow = BT_COMMON_COLOR_FG_YELLOW;
+		bt_common_color_code_fg_blue = BT_COMMON_COLOR_FG_BLUE;
+		bt_common_color_code_fg_magenta = BT_COMMON_COLOR_FG_MAGENTA;
+		bt_common_color_code_fg_cyan = BT_COMMON_COLOR_FG_CYAN;
+		bt_common_color_code_fg_light_gray = BT_COMMON_COLOR_FG_LIGHT_GRAY;
+		bt_common_color_code_bg_default = BT_COMMON_COLOR_BG_DEFAULT;
+		bt_common_color_code_bg_red = BT_COMMON_COLOR_BG_RED;
+		bt_common_color_code_bg_green = BT_COMMON_COLOR_BG_GREEN;
+		bt_common_color_code_bg_yellow = BT_COMMON_COLOR_BG_YELLOW;
+		bt_common_color_code_bg_blue = BT_COMMON_COLOR_BG_BLUE;
+		bt_common_color_code_bg_magenta = BT_COMMON_COLOR_BG_MAGENTA;
+		bt_common_color_code_bg_cyan = BT_COMMON_COLOR_BG_CYAN;
+		bt_common_color_code_bg_light_gray = BT_COMMON_COLOR_BG_LIGHT_GRAY;
+	}
+}
 
 BT_HIDDEN
 const char *bt_common_get_system_plugin_path(void)
@@ -43,23 +101,40 @@ const char *bt_common_get_system_plugin_path(void)
 	return SYSTEM_PLUGIN_PATH;
 }
 
+#ifdef __MINGW32__
+BT_HIDDEN
+bool bt_common_is_setuid_setgid(void)
+{
+	return false;
+}
+#else /* __MINGW32__ */
 BT_HIDDEN
 bool bt_common_is_setuid_setgid(void)
 {
 	return (geteuid() != getuid() || getegid() != getgid());
 }
+#endif /* __MINGW32__ */
 
-static char *bt_secure_getenv(const char *name)
+static
+char *bt_secure_getenv(const char *name)
 {
 	if (bt_common_is_setuid_setgid()) {
-		printf_error("Disregarding %s environment variable for setuid/setgid binary",
-			name);
+		BT_LOGD("Disregarding environment variable for setuid/setgid binary: "
+			"name=\"%s\"", name);
 		return NULL;
 	}
 	return getenv(name);
 }
 
-static const char *get_home_dir(void)
+#ifdef __MINGW32__
+static
+const char *bt_get_home_dir(void)
+{
+	return g_get_home_dir();
+}
+#else /* __MINGW32__ */
+static
+const char *bt_get_home_dir(void)
 {
 	char *val = NULL;
 	struct passwd *pwd;
@@ -77,21 +152,25 @@ static const char *get_home_dir(void)
 end:
 	return val;
 }
+#endif /* __MINGW32__ */
 
 BT_HIDDEN
 char *bt_common_get_home_plugin_path(void)
 {
 	char *path = NULL;
 	const char *home_dir;
+	size_t length;
 
-	home_dir = get_home_dir();
+	home_dir = bt_get_home_dir();
 	if (!home_dir) {
 		goto end;
 	}
 
-	if (strlen(home_dir) + strlen(HOME_PLUGIN_SUBPATH) + 1 >= PATH_MAX) {
-		printf_error("Home directory path is too long: `%s`\n",
-			home_dir);
+	length = strlen(home_dir) + strlen(HOME_PLUGIN_SUBPATH) + 1;
+
+	if (length >= PATH_MAX) {
+		BT_LOGW("Home directory path is too long: length=%zu",
+			length);
 		goto end;
 	}
 
@@ -115,7 +194,7 @@ int bt_common_append_plugin_path_dirs(const char *paths, GPtrArray *dirs)
 	const char *end;
 	size_t init_dirs_len;
 
-	assert(dirs);
+	BT_ASSERT(dirs);
 	init_dirs_len = dirs->len;
 
 	if (!paths) {
@@ -128,19 +207,19 @@ int bt_common_append_plugin_path_dirs(const char *paths, GPtrArray *dirs)
 
 	while (at < end) {
 		GString *path;
-		const char *next_colon;
+		const char *next_sep;
 
-		next_colon = strchr(at, ':');
-		if (next_colon == at) {
+		next_sep = strchr(at, G_SEARCHPATH_SEPARATOR);
+		if (next_sep == at) {
 			/*
 			 * Empty path: try next character (supported
 			 * to conform to the typical parsing of $PATH).
 			 */
 			at++;
 			continue;
-		} else if (!next_colon) {
-			/* No more colon: use the remaining */
-			next_colon = paths + strlen(paths);
+		} else if (!next_sep) {
+			/* No more separator: use the remaining */
+			next_sep = paths + strlen(paths);
 		}
 
 		path = g_string_new(NULL);
@@ -148,8 +227,8 @@ int bt_common_append_plugin_path_dirs(const char *paths, GPtrArray *dirs)
 			goto error;
 		}
 
-		g_string_append_len(path, at, next_colon - at);
-		at = next_colon + 1;
+		g_string_append_len(path, at, next_sep - at);
+		at = next_sep + 1;
 		g_ptr_array_add(dirs, path);
 	}
 
@@ -167,12 +246,37 @@ end:
 	return ret;
 }
 
+static
+bool isarealtty(int fd)
+{
+	bool istty = false;
+	struct stat tty_stats;
+
+	if (!isatty(fd)) {
+		/* Not a TTY */
+		goto end;
+	}
+
+	if (fstat(fd, &tty_stats) == 0) {
+		if (!S_ISCHR(tty_stats.st_mode)) {
+			/* Not a character device: not a TTY */
+			goto end;
+		}
+	}
+
+	istty = true;
+
+end:
+	return istty;
+}
+
 BT_HIDDEN
 bool bt_common_colors_supported(void)
 {
 	static bool supports_colors = false;
 	static bool supports_colors_set = false;
-	const char *term;
+	const char *term_env_var;
+	const char *term_color_env_var;
 
 	if (supports_colors_set) {
 		goto end;
@@ -180,22 +284,39 @@ bool bt_common_colors_supported(void)
 
 	supports_colors_set = true;
 
-	term = getenv("TERM");
-	if (!term) {
+	/*
+	 * `BABELTRACE_TERM_COLOR` environment variable always overrides
+	 * the automatic color support detection.
+	 */
+	term_color_env_var = getenv("BABELTRACE_TERM_COLOR");
+	if (term_color_env_var) {
+		if (g_ascii_strcasecmp(term_color_env_var, "always") == 0) {
+			/* Force colors */
+			supports_colors = true;
+		} else if (g_ascii_strcasecmp(term_color_env_var, "never") == 0) {
+			/* Force no colors */
+			goto end;
+		}
+	}
+
+	/* We need a compatible, known terminal */
+	term_env_var = getenv("TERM");
+	if (!term_env_var) {
 		goto end;
 	}
 
-	if (strncmp(term, "xterm", 5) != 0 &&
-			strncmp(term, "rxvt", 4) != 0 &&
-			strncmp(term, "konsole", 7) != 0 &&
-			strncmp(term, "gnome", 5) != 0 &&
-			strncmp(term, "screen", 5) != 0 &&
-			strncmp(term, "tmux", 4) != 0 &&
-			strncmp(term, "putty", 5) != 0) {
+	if (strncmp(term_env_var, "xterm", 5) != 0 &&
+			strncmp(term_env_var, "rxvt", 4) != 0 &&
+			strncmp(term_env_var, "konsole", 7) != 0 &&
+			strncmp(term_env_var, "gnome", 5) != 0 &&
+			strncmp(term_env_var, "screen", 5) != 0 &&
+			strncmp(term_env_var, "tmux", 4) != 0 &&
+			strncmp(term_env_var, "putty", 5) != 0) {
 		goto end;
 	}
 
-	if (!isatty(1)) {
+	/* Both standard output and error streams need to be TTYs */
+	if (!isarealtty(STDOUT_FILENO) || !isarealtty(STDERR_FILENO)) {
 		goto end;
 	}
 
@@ -208,111 +329,109 @@ end:
 BT_HIDDEN
 const char *bt_common_color_reset(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_RESET : "";
+	return bt_common_color_code_reset;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bold(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BOLD : "";
+	return bt_common_color_code_bold;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_default(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_DEFAULT : "";
+	return bt_common_color_code_fg_default;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_red(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_RED : "";
+	return bt_common_color_code_fg_red;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_green(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_GREEN : "";
+	return bt_common_color_code_fg_green;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_yellow(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_YELLOW : "";
+	return bt_common_color_code_fg_yellow;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_blue(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_BLUE : "";
+	return bt_common_color_code_fg_blue;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_magenta(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_MAGENTA : "";
+	return bt_common_color_code_fg_magenta;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_cyan(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_FG_CYAN : "";
+	return bt_common_color_code_fg_cyan;
 }
 
 BT_HIDDEN
 const char *bt_common_color_fg_light_gray(void)
 {
-	return bt_common_colors_supported() ?
-		BT_COMMON_COLOR_FG_LIGHT_GRAY : "";
+	return bt_common_color_code_fg_light_gray;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_default(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_DEFAULT : "";
+	return bt_common_color_code_bg_default;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_red(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_RED : "";
+	return bt_common_color_code_bg_red;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_green(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_GREEN : "";
+	return bt_common_color_code_bg_green;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_yellow(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_YELLOW : "";
+	return bt_common_color_code_bg_yellow;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_blue(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_BLUE : "";
+	return bt_common_color_code_bg_blue;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_magenta(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_MAGENTA : "";
+	return bt_common_color_code_bg_magenta;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_cyan(void)
 {
-	return bt_common_colors_supported() ? BT_COMMON_COLOR_BG_CYAN : "";
+	return bt_common_color_code_bg_cyan;
 }
 
 BT_HIDDEN
 const char *bt_common_color_bg_light_gray(void)
 {
-	return bt_common_colors_supported() ?
-		BT_COMMON_COLOR_BG_LIGHT_GRAY : "";
+	return bt_common_color_code_bg_light_gray;
 }
 
 BT_HIDDEN
@@ -458,7 +577,7 @@ bool bt_common_string_is_printable(const char *input)
 {
 	const char *ch;
 	bool printable = true;
-	assert(input);
+	BT_ASSERT(input);
 
 	for (ch = input; *ch != '\0'; ch++) {
 		if (!isprint(*ch) && *ch != '\n' && *ch != '\r' &&
@@ -512,7 +631,7 @@ struct bt_common_lttng_live_url_parts bt_common_parse_lttng_live_url(
 	const char *at = url;
 	size_t end_pos;
 
-	assert(url);
+	BT_ASSERT(url);
 	memset(&parts, 0, sizeof(parts));
 	parts.port = -1;
 
@@ -681,7 +800,7 @@ void bt_common_normalize_star_glob_pattern(char *pattern)
 	char *np;
 	bool got_star = false;
 
-	assert(pattern);
+	BT_ASSERT(pattern);
 
 	for (p = pattern, np = pattern; *p != '\0'; p++) {
 		switch (*p) {
@@ -703,7 +822,7 @@ void bt_common_normalize_star_glob_pattern(char *pattern)
 				goto end;
 			}
 
-			/* Fall through default case. */
+			/* fall-through */
 		default:
 			got_star = false;
 			break;
@@ -889,7 +1008,7 @@ retry:
 	 *                         ^  ^ SUCCESS
 	 */
 	while ((c - candidate) < candidate_len && *c != '\0') {
-		assert(*c);
+		BT_ASSERT(*c);
 
 		if (at_end_of_pattern(p, pattern, pattern_len)) {
 			goto end_of_pattern;
@@ -923,6 +1042,7 @@ retry:
 			 * Fall through the default case which compares
 			 * the escaped character now.
 			 */
+			/* fall-through */
 		default:
 			if (at_end_of_pattern(p, pattern, pattern_len) ||
 					*c != *p) {
@@ -966,3 +1086,484 @@ end_of_pattern:
 	p++;
 	return p[-1] == '*' && at_end_of_pattern(p, pattern, pattern_len);
 }
+
+static
+void append_path_parts(const char *path, GPtrArray *parts)
+{
+	const char *ch = path;
+	const char *last = path;
+
+	while (true) {
+		if (*ch == G_DIR_SEPARATOR || *ch == '\0') {
+			if (ch - last > 0) {
+				GString *part = g_string_new(NULL);
+
+				BT_ASSERT(part);
+				g_string_append_len(part, last, ch - last);
+				g_ptr_array_add(parts, part);
+			}
+
+			if (*ch == '\0') {
+				break;
+			}
+
+			last = ch + 1;
+		}
+
+		ch++;
+	}
+}
+
+static
+void destroy_gstring(void *gstring)
+{
+	(void) g_string_free(gstring, TRUE);
+}
+
+#ifdef __MINGW32__
+BT_HIDDEN
+GString *bt_common_normalize_path(const char *path, const char *wd)
+{
+	char *tmp;
+	GString *norm_path = NULL;
+
+	BT_ASSERT(path);
+
+	tmp = _fullpath(NULL, path, PATH_MAX);
+	if (!tmp) {
+		goto error;
+	}
+
+	norm_path = g_string_new(tmp);
+	if (!norm_path) {
+		goto error;
+	}
+
+	goto end;
+error:
+	if (norm_path) {
+		g_string_free(norm_path, TRUE);
+		norm_path = NULL;
+	}
+end:
+	if (tmp) {
+		free(tmp);
+	}
+	return norm_path;
+}
+#else
+BT_HIDDEN
+GString *bt_common_normalize_path(const char *path, const char *wd)
+{
+	size_t i;
+	GString *norm_path;
+	GPtrArray *parts = NULL;
+
+	BT_ASSERT(path);
+	norm_path = g_string_new(G_DIR_SEPARATOR_S);
+	if (!norm_path) {
+		goto error;
+	}
+
+	parts = g_ptr_array_new_with_free_func(destroy_gstring);
+	if (!parts) {
+		goto error;
+	}
+
+	if (path[0] != G_DIR_SEPARATOR) {
+		/* Relative path: start with working directory */
+		if (wd) {
+			append_path_parts(wd, parts);
+		} else {
+			gchar *cd = g_get_current_dir();
+
+			append_path_parts(cd, parts);
+			g_free(cd);
+		}
+	}
+
+	/* Append parts of the path parameter */
+	append_path_parts(path, parts);
+
+	/* Resolve special `..` and `.` parts */
+	for (i = 0; i < parts->len; i++) {
+		GString *part = g_ptr_array_index(parts, i);
+
+		if (strcmp(part->str, "..") == 0) {
+			if (i == 0) {
+				/*
+				 * First part of absolute path is `..`:
+				 * this is invalid.
+				 */
+				goto error;
+			}
+
+			/* Remove `..` and previous part */
+			g_ptr_array_remove_index(parts, i - 1);
+			g_ptr_array_remove_index(parts, i - 1);
+			i -= 2;
+		} else if (strcmp(part->str, ".") == 0) {
+			/* Remove `.` */
+			g_ptr_array_remove_index(parts, i);
+			i -= 1;
+		}
+	}
+
+	/* Create normalized path with what's left */
+	for (i = 0; i < parts->len; i++) {
+		GString *part = g_ptr_array_index(parts, i);
+
+		g_string_append(norm_path, part->str);
+
+		if (i < parts->len - 1) {
+			g_string_append_c(norm_path, G_DIR_SEPARATOR);
+		}
+	}
+
+	goto end;
+
+error:
+	if (norm_path) {
+		g_string_free(norm_path, TRUE);
+		norm_path = NULL;
+	}
+
+end:
+	if (parts) {
+		g_ptr_array_free(parts, TRUE);
+	}
+
+	return norm_path;
+}
+#endif
+
+BT_HIDDEN
+size_t bt_common_get_page_size(void)
+{
+	int page_size;
+
+	page_size = bt_sysconf(_SC_PAGESIZE);
+	if (page_size < 0) {
+		BT_LOGF("Cannot get system's page size: ret=%d",
+			page_size);
+		abort();
+	}
+
+	return page_size;
+}
+
+#define BUF_STD_APPEND(...)						\
+	do {								\
+		char _tmp_fmt[64];					\
+		int _count;						\
+		size_t _size = buf_size - (size_t) (*buf_ch - buf);	\
+		size_t _tmp_fmt_size = (size_t) (fmt_ch - *out_fmt_ch);	\
+		strncpy(_tmp_fmt, *out_fmt_ch, _tmp_fmt_size);		\
+		_tmp_fmt[_tmp_fmt_size] = '\0';				\
+		_count = snprintf(*buf_ch, _size, _tmp_fmt, __VA_ARGS__); \
+		BT_ASSERT(_count >= 0);					\
+		*buf_ch += MIN(_count, _size);				\
+	} while (0)
+
+#define BUF_STD_APPEND_SINGLE_ARG(_type)				\
+	do {								\
+		_type _arg = va_arg(*args, _type);			\
+		BUF_STD_APPEND(_arg);					\
+	} while (0)
+
+static inline void handle_conversion_specifier_std(char *buf, char **buf_ch,
+		size_t buf_size, const char **out_fmt_ch, va_list *args)
+{
+	const char *fmt_ch = *out_fmt_ch;
+	enum LENGTH_MODIFIER {
+		LENGTH_MOD_H,
+		LENGTH_MOD_HH,
+		LENGTH_MOD_NONE,
+		LENGTH_MOD_LOW_L,
+		LENGTH_MOD_LOW_LL,
+		LENGTH_MOD_UP_L,
+		LENGTH_MOD_Z,
+	} length_mod = LENGTH_MOD_NONE;
+
+	/* skip '%' */
+	fmt_ch++;
+
+	if (*fmt_ch == '%') {
+		fmt_ch++;
+		**buf_ch = '%';
+		(*buf_ch)++;
+		goto update_rw_fmt;
+	}
+
+	/* flags */
+	for (;;) {
+		switch (*fmt_ch) {
+			case '-':
+			case '+':
+			case ' ':
+			case '#':
+			case '0':
+			case '\'':
+				fmt_ch++;
+				continue;
+			default:
+				break;
+		}
+		break;
+	}
+
+	/* width */
+	for (;;) {
+		if (*fmt_ch < '0' || *fmt_ch > '9') {
+			break;
+		}
+
+		fmt_ch++;
+	}
+
+	/* precision */
+	if (*fmt_ch == '.') {
+		fmt_ch++;
+
+		for (;;) {
+			if (*fmt_ch < '0' || *fmt_ch > '9') {
+				break;
+			}
+
+			fmt_ch++;
+		}
+	}
+
+	/* format (PRI*64) */
+	if (strncmp(fmt_ch, PRId64, sizeof(PRId64) - 1) == 0) {
+		fmt_ch += sizeof(PRId64) - 1;
+		BUF_STD_APPEND_SINGLE_ARG(int64_t);
+		goto update_rw_fmt;
+	} else if (strncmp(fmt_ch, PRIu64, sizeof(PRIu64) - 1) == 0) {
+		fmt_ch += sizeof(PRIu64) - 1;
+		BUF_STD_APPEND_SINGLE_ARG(uint64_t);
+		goto update_rw_fmt;
+	} else if (strncmp(fmt_ch, PRIx64, sizeof(PRIx64) - 1) == 0) {
+		fmt_ch += sizeof(PRIx64) - 1;
+		BUF_STD_APPEND_SINGLE_ARG(uint64_t);
+		goto update_rw_fmt;
+	} else if (strncmp(fmt_ch, PRIX64, sizeof(PRIX64) - 1) == 0) {
+		fmt_ch += sizeof(PRIX64) - 1;
+		BUF_STD_APPEND_SINGLE_ARG(uint64_t);
+		goto update_rw_fmt;
+	} else if (strncmp(fmt_ch, PRIo64, sizeof(PRIo64) - 1) == 0) {
+		fmt_ch += sizeof(PRIo64) - 1;
+		BUF_STD_APPEND_SINGLE_ARG(uint64_t);
+		goto update_rw_fmt;
+	} else if (strncmp(fmt_ch, PRIi64, sizeof(PRIi64) - 1) == 0) {
+		fmt_ch += sizeof(PRIi64) - 1;
+		BUF_STD_APPEND_SINGLE_ARG(int64_t);
+		goto update_rw_fmt;
+	}
+
+	// length modifier
+	switch (*fmt_ch) {
+		case 'h':
+			length_mod = LENGTH_MOD_H;
+			fmt_ch++;
+
+			if (*fmt_ch == 'h') {
+				length_mod = LENGTH_MOD_HH;
+				fmt_ch++;
+				break;
+			}
+			break;
+		case 'l':
+			length_mod = LENGTH_MOD_LOW_L;
+			fmt_ch++;
+
+			if (*fmt_ch == 'l') {
+				length_mod = LENGTH_MOD_LOW_LL;
+				fmt_ch++;
+				break;
+			}
+			break;
+		case 'L':
+			length_mod = LENGTH_MOD_UP_L;
+			fmt_ch++;
+			break;
+		case 'z':
+			length_mod = LENGTH_MOD_Z;
+			fmt_ch++;
+			break;
+		default:
+			break;
+	}
+
+	// format
+	switch (*fmt_ch) {
+	case 'c':
+	{
+		fmt_ch++;
+
+		switch (length_mod) {
+		case LENGTH_MOD_NONE:
+			BUF_STD_APPEND_SINGLE_ARG(int);
+			break;
+		case LENGTH_MOD_LOW_L:
+			BUF_STD_APPEND_SINGLE_ARG(wint_t);
+			break;
+		default:
+			abort();
+		}
+		break;
+	}
+	case 's':
+		fmt_ch++;
+
+		switch (length_mod) {
+		case LENGTH_MOD_NONE:
+			BUF_STD_APPEND_SINGLE_ARG(char *);
+			break;
+		case LENGTH_MOD_LOW_L:
+			BUF_STD_APPEND_SINGLE_ARG(wchar_t *);
+			break;
+		default:
+			abort();
+		}
+		break;
+	case 'd':
+	case 'i':
+		fmt_ch++;
+
+		switch (length_mod) {
+		case LENGTH_MOD_NONE:
+		case LENGTH_MOD_H:
+		case LENGTH_MOD_HH:
+			BUF_STD_APPEND_SINGLE_ARG(int);
+			break;
+		case LENGTH_MOD_LOW_L:
+			BUF_STD_APPEND_SINGLE_ARG(long);
+			break;
+		case LENGTH_MOD_LOW_LL:
+			BUF_STD_APPEND_SINGLE_ARG(long long);
+			break;
+		case LENGTH_MOD_Z:
+			BUF_STD_APPEND_SINGLE_ARG(size_t);
+			break;
+		default:
+			abort();
+		}
+		break;
+	case 'o':
+	case 'x':
+	case 'X':
+	case 'u':
+		fmt_ch++;
+
+		switch (length_mod) {
+		case LENGTH_MOD_NONE:
+		case LENGTH_MOD_H:
+		case LENGTH_MOD_HH:
+			BUF_STD_APPEND_SINGLE_ARG(unsigned int);
+			break;
+		case LENGTH_MOD_LOW_L:
+			BUF_STD_APPEND_SINGLE_ARG(unsigned long);
+			break;
+		case LENGTH_MOD_LOW_LL:
+			BUF_STD_APPEND_SINGLE_ARG(unsigned long long);
+			break;
+		case LENGTH_MOD_Z:
+			BUF_STD_APPEND_SINGLE_ARG(size_t);
+			break;
+		default:
+			abort();
+		}
+		break;
+	case 'f':
+	case 'F':
+	case 'e':
+	case 'E':
+	case 'g':
+	case 'G':
+		fmt_ch++;
+
+		switch (length_mod) {
+		case LENGTH_MOD_NONE:
+			BUF_STD_APPEND_SINGLE_ARG(double);
+			break;
+		case LENGTH_MOD_UP_L:
+			BUF_STD_APPEND_SINGLE_ARG(long double);
+			break;
+		default:
+			abort();
+		}
+		break;
+	case 'p':
+		fmt_ch++;
+
+		if (length_mod == LENGTH_MOD_NONE) {
+			BUF_STD_APPEND_SINGLE_ARG(void *);
+		} else {
+			abort();
+		}
+		break;
+	default:
+		abort();
+	}
+
+update_rw_fmt:
+	*out_fmt_ch = fmt_ch;
+}
+
+BT_HIDDEN
+void bt_common_custom_vsnprintf(char *buf, size_t buf_size,
+		char intro,
+		bt_common_handle_custom_specifier_func handle_specifier,
+		void *priv_data, const char *fmt, va_list *args)
+{
+	const char *fmt_ch = fmt;
+	char *buf_ch = buf;
+
+	BT_ASSERT(buf);
+	BT_ASSERT(fmt);
+
+	while (*fmt_ch != '\0') {
+		switch (*fmt_ch) {
+		case '%':
+			BT_ASSERT(fmt_ch[1] != '\0');
+
+			if (fmt_ch[1] == intro) {
+				handle_specifier(priv_data, &buf_ch,
+					buf_size - (size_t) (buf_ch - buf),
+					&fmt_ch, args);
+			} else {
+				handle_conversion_specifier_std(buf, &buf_ch,
+					buf_size, &fmt_ch, args);
+			}
+
+			if (buf_ch >= buf + buf_size - 1) {
+				fmt_ch = "";
+			}
+			break;
+		default:
+			*buf_ch = *fmt_ch;
+			buf_ch++;
+			if (buf_ch >= buf + buf_size - 1) {
+				fmt_ch = "";
+			}
+
+			fmt_ch++;
+		}
+	}
+
+	*buf_ch = '\0';
+}
+
+BT_HIDDEN
+void bt_common_custom_snprintf(char *buf, size_t buf_size,
+		char intro,
+		bt_common_handle_custom_specifier_func handle_specifier,
+		void *priv_data, const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	bt_common_custom_vsnprintf(buf, buf_size, intro, handle_specifier,
+		priv_data, fmt, &args);
+	va_end(args);
+}