Replace several uses of snprintf() by asprintf()

Use asprintf() in some cold code paths. While allocating memory on the
heap is a bit slower, using asprintf() is a bit more memory efficient
and less prone to buffer overflow errors.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

9 files changed, 150 insertions, 135 deletions

diff --git a/src/calcurse.c b/src/calcurse.c
index 81f668d..2e015b4 100644
--- a/src/calcurse.c
+++ b/src/calcurse.c
@@ -256,6 +256,8 @@ static inline void key_generic_save(void)
 
 static inline void key_generic_reload(void)
 {
+	char *msg_um_asktype = NULL;
+
 	if (io_get_modified()) {
 		const char *msg_um_prefix =
 				_("There are unsaved modifications:");
@@ -264,10 +266,8 @@ static inline void key_generic_reload(void)
 		const char *msg_um_keep = _("(k)eep and cancel");
 		const char *msg_um_choice = _("[dmk]");
 
-		char msg_um_asktype[BUFSIZ];
-		snprintf(msg_um_asktype, BUFSIZ, "%s %s, %s, %s",
-			 msg_um_prefix, msg_um_discard, msg_um_merge,
-			 msg_um_keep);
+		asprintf(&msg_um_asktype, "%s %s, %s, %s", msg_um_prefix,
+			 msg_um_discard, msg_um_merge, msg_um_keep);
 
 		char *path_apts_backup, *path_todo_backup;
 		const char *backup_ext = ".sav";
@@ -276,14 +276,10 @@ static inline void key_generic_reload(void)
 		case 1:
 			break;
 		case 2:
-			path_apts_backup = mem_malloc(strlen(path_apts) +
-						      strlen(backup_ext) + 1);
-			path_todo_backup = mem_malloc(strlen(path_todo) +
-						      strlen(backup_ext) + 1);
-			sprintf(path_apts_backup, "%s%s", path_apts,
-				backup_ext);
-			sprintf(path_todo_backup, "%s%s", path_todo,
-				backup_ext);
+			asprintf(&path_apts_backup, "%s%s", path_apts,
+				 backup_ext);
+			asprintf(&path_todo_backup, "%s%s", path_todo,
+				 backup_ext);
 
 			io_save_mutex_lock();
 			io_save_apts(path_apts_backup);
@@ -313,7 +309,7 @@ static inline void key_generic_reload(void)
 			/* FALLTHROUGH */
 		default:
 			wins_update(FLAG_STA);
-			return;
+			goto cleanup;
 		}
 	}
 
@@ -346,6 +342,9 @@ static inline void key_generic_reload(void)
 	notify_check_next_app(1);
 	ui_calendar_monthly_view_cache_set_invalid();
 	wins_update(FLAG_ALL);
+
+cleanup:
+	mem_free(msg_um_asktype);
 }
 
 static inline void key_generic_import(void)
@@ -533,6 +532,7 @@ static inline void key_generic_cmd(void)
 	char cmd[BUFSIZ] = "";
 	char *cmd_name;
 	int valid = 0, force = 0;
+	char *error_msg;
 
 	status_mesg(_("Command:"), "");
 	if (getstring(win[STA].p, cmd, BUFSIZ, 0, 1) != GETSTRING_VALID)
@@ -563,26 +563,19 @@ static inline void key_generic_cmd(void)
 		char *topic = strtok(NULL, " ");
 
 		if (!display_help(topic)) {
-			char error_msg[BUFSIZ];
-
-			snprintf(error_msg, BUFSIZ,
-					_("Help topic does not exist: %s"),
-					topic);
-			error_msg[BUFSIZ - 1] = '\0';
-
+			asprintf(&error_msg,
+				 _("Help topic does not exist: %s"), topic);
 			warnbox(error_msg);
+			mem_free(error_msg);
 		}
 
 		valid = 1;
 	}
 
 	if (!valid) {
-		char error_msg[BUFSIZ];
-
-		snprintf(error_msg, BUFSIZ, _("No such command: %s"), cmd);
-		error_msg[BUFSIZ - 1] = '\0';
-
+		asprintf(&error_msg, _("No such command: %s"), cmd);
 		warnbox(error_msg);
+		mem_free(error_msg);
 	}
 
 cleanup:
diff --git a/src/config.c b/src/config.c
index 5eb526a..5ce7001 100644
--- a/src/config.c
+++ b/src/config.c
@@ -449,8 +449,7 @@ config_serialize_conf(char *buf, const char *key,
 
 	for (i = 0; i < ARRAY_SIZE(confmap); i++) {
 		if (!strcmp(confmap[i].key, key)) {
-			if (confmap[i].
-			    fn_serialize(buf, confmap[i].target)) {
+			if (confmap[i].fn_serialize(buf, confmap[i].target)) {
 				if (status)
 					status->done[i] = 1;
 				return 1;
diff --git a/src/custom.c b/src/custom.c
index b3d5da5..cccf7b1 100644
--- a/src/custom.c
+++ b/src/custom.c
@@ -803,14 +803,15 @@ print_keys_bindings(WINDOW * win, int selected_row, int selected_elm,
 
 	noelm = y = 0;
 	for (action = 0; action < NBKEYS; action++) {
-		char actionstr[BUFSIZ];
+		char *actionstr;
 		int nbkeys;
 
 		nbkeys = keys_action_count_keys(action);
-		snprintf(actionstr, BUFSIZ, "%s", keys_get_label(action));
+		asprintf(&actionstr, "%s", keys_get_label(action));
 		if (action == selected_row)
 			custom_apply_attr(win, ATTR_HIGHEST);
 		mvwprintw(win, y, XPOS, "%s ", actionstr);
+		mem_free(actionstr);
 		mvwaddstr(win, y, EQUALPOS, "=");
 		if (nbkeys == 0)
 			mvwaddstr(win, y, KEYPOS, _("undefined"));
diff --git a/src/help.c b/src/help.c
index 09f9197..fe144f4 100644
--- a/src/help.c
+++ b/src/help.c
@@ -36,7 +36,7 @@
 
 #include "calcurse.h"
 
-static int find_basedir(const char *locale_info[], unsigned n, char *basedir)
+static int find_basedir(const char *locale_info[], unsigned n, char **basedir)
 {
 	int i;
 	char *locale = NULL;
@@ -47,29 +47,33 @@ static int find_basedir(const char *locale_info[], unsigned n, char *basedir)
 			continue;
 		locale = strdup(locale_info[i]);
 
-		snprintf(basedir, BUFSIZ, DOCDIR "/%s", locale);
-		if (io_dir_exists(basedir)) {
+		asprintf(basedir, "%s/%s", DOCDIR, locale);
+		if (io_dir_exists(*basedir)) {
 			ret = 1;
 			goto cleanup;
 		}
 
 		strtok(locale, ".@");
 
-		snprintf(basedir, BUFSIZ, DOCDIR "/%s", locale);
-		if (io_dir_exists(basedir)) {
+		mem_free(*basedir);
+		asprintf(basedir, "%s/%s", DOCDIR, locale);
+		if (io_dir_exists(*basedir)) {
 			ret = 1;
 			goto cleanup;
 		}
 
 		strtok(locale, "_");
 
-		snprintf(basedir, BUFSIZ, DOCDIR "/%s", locale);
-		if (io_dir_exists(basedir)) {
+		mem_free(*basedir);
+		asprintf(basedir, "%s/%s", DOCDIR, locale);
+		if (io_dir_exists(*basedir)) {
 			ret = 1;
 			goto cleanup;
 		}
 
-		free(locale);
+		mem_free(*basedir);
+		basedir = NULL;
+		mem_free(locale);
 		locale = NULL;
 	}
 
@@ -87,23 +91,27 @@ int display_help(const char *topic)
 		getenv("LC_MESSAGE"),
 		getenv("LANG")
 	};
-	char basedir[BUFSIZ];
-	char path[BUFSIZ];
+	char *basedir;
+	char *path;
+	int ret = 0;
 
 	if (!topic)
 		topic = "intro";
 
-	if (!find_basedir(locale_info, ARRAY_SIZE(locale_info), basedir))
-		snprintf(basedir, BUFSIZ, DOCDIR);
+	if (!find_basedir(locale_info, ARRAY_SIZE(locale_info), &basedir)) {
+		mem_free(basedir);
+		asprintf(&basedir, "%s", DOCDIR);
+	}
 
-	snprintf(path, BUFSIZ, "%s/%s.txt", basedir, topic);
+	asprintf(&path, "%s/%s.txt", basedir, topic);
 
 	if (!io_file_exists(path) && keys_str2int(topic) > 0 &&
 	    keys_get_action(keys_str2int(topic)) > 0) {
 		int ch = keys_str2int(topic);
 		enum key action = keys_get_action(ch);
 		topic = keys_get_label(action);
-		snprintf(path, BUFSIZ, "%s/%s.txt", basedir, topic);
+		mem_free(path);
+		asprintf(&path, "%s/%s.txt", basedir, topic);
 	}
 
 	if (!io_file_exists(path)) {
@@ -185,14 +193,17 @@ int display_help(const char *topic)
 			topic = "priority";
 		else if (!strcmp(topic, "lower-priority"))
 			topic = "priority";
-		snprintf(path, BUFSIZ, "%s/%s.txt", basedir, topic);
+		mem_free(path);
+		asprintf(&path, "%s/%s.txt", basedir, topic);
 	}
 
 	if (io_file_exists(path)) {
 		const char *arg[] = { conf.pager, path, NULL };
 		wins_launch_external(arg);
-		return 1;
-	} else {
-		return 0;
+		ret = 1;
 	}
+
+	mem_free(basedir);
+	mem_free(path);
+	return ret;
 }
diff --git a/src/io.c b/src/io.c
index 1ac8cd4..70f0ede 100644
--- a/src/io.c
+++ b/src/io.c
@@ -166,13 +166,11 @@ static FILE *get_export_stream(enum export_type type)
 	const char *file_ext[IO_EXPORT_NBTYPES] = { "ical", "txt" };
 
 	stream = NULL;
-	stream_name = (char *)mem_malloc(BUFSIZ);
 	if ((home = getenv("HOME")) != NULL)
-		snprintf(stream_name, BUFSIZ, "%s/calcurse.%s", home,
-			 file_ext[type]);
+		asprintf(&stream_name, "%s/calcurse.%s", home, file_ext[type]);
 	else
-		snprintf(stream_name, BUFSIZ, "%s/calcurse.%s",
-			 get_tempdir(), file_ext[type]);
+		asprintf(&stream_name, "%s/calcurse.%s", get_tempdir(),
+			 file_ext[type]);
 
 	while (stream == NULL) {
 		status_mesg(question, "");
@@ -186,8 +184,8 @@ static FILE *get_export_stream(enum export_type type)
 			wgetch(win[KEY].p);
 		}
 	}
-	mem_free(stream_name);
 
+	mem_free(stream_name);
 	return stream;
 }
 
@@ -196,7 +194,7 @@ unsigned io_fprintln(const char *fname, const char *fmt, ...)
 {
 	FILE *fp;
 	va_list ap;
-	char buf[BUFSIZ];
+	char *buf;
 	int ret;
 
 	fp = fopen(fname, "a");
@@ -204,7 +202,7 @@ unsigned io_fprintln(const char *fname, const char *fmt, ...)
 		  strerror(errno));
 
 	va_start(ap, fmt);
-	ret = vsnprintf(buf, sizeof buf, fmt, ap);
+	ret = vasprintf(&buf, fmt, ap);
 	RETVAL_IF(ret < 0, 0, _("Failed to build message\n"));
 	va_end(ap);
 
@@ -215,6 +213,7 @@ unsigned io_fprintln(const char *fname, const char *fmt, ...)
 	RETVAL_IF(ret != 0, 0, _("Failed to close \"%s\" - %s\n"),
 		  fname, strerror(errno));
 
+	mem_free(buf);
 	return 1;
 }
 
@@ -809,14 +808,14 @@ void io_load_keys(const char *pager)
 				int ch;
 
 				if ((ch = keys_str2int(key_ch)) < 0) {
-					char unknown_key[BUFSIZ];
+					char *unknown_key;
 
 					skipped++;
-					(void)snprintf(unknown_key, BUFSIZ,
-						       _("Error reading key: \"%s\""),
-						       key_ch);
-					io_log_print(log, line,
-						     unknown_key);
+					asprintf(&unknown_key,
+						 _("Error reading key: \"%s\""),
+						 key_ch);
+					io_log_print(log, line, unknown_key);
+					mem_free(unknown_key);
 				} else {
 					int used;
 
@@ -825,18 +824,15 @@ void io_load_keys(const char *pager)
 								ht_elm->
 								key);
 					if (used) {
-						char already_assigned
-						    [BUFSIZ];
+						char *already_assigned;
 
 						skipped++;
-						(void)
-						    snprintf
-						    (already_assigned,
-						     BUFSIZ,
-						     _("\"%s\" assigned multiple times!"),
-						     key_ch);
+						asprintf(&already_assigned,
+							 _("\"%s\" assigned multiple times!"),
+							 key_ch);
 						io_log_print(log, line,
 							     already_assigned);
+						mem_free(already_assigned);
 					} else {
 						assigned++;
 					}
@@ -1048,7 +1044,7 @@ void io_import_data(enum import_type type, const char *stream_name)
 {
 	const char *proc_report =
 	    _("Import process report: %04d lines read ");
-	char stats_str[4][BUFSIZ];
+	char *stats_str[4];
 	FILE *stream = NULL;
 	struct io_file *log;
 	struct {
@@ -1092,25 +1088,25 @@ void io_import_data(enum import_type type, const char *stream_name)
 	if (stream != stdin)
 		file_close(stream, __FILE_POS__);
 
-	snprintf(stats_str[0], BUFSIZ,
-		 ngettext("%d app", "%d apps", stats.apoints),
+	asprintf(&stats_str[0], ngettext("%d app", "%d apps", stats.apoints),
 		 stats.apoints);
-	snprintf(stats_str[1], BUFSIZ,
+	asprintf(&stats_str[1],
 		 ngettext("%d event", "%d events", stats.events),
 		 stats.events);
-	snprintf(stats_str[2], BUFSIZ,
-		 ngettext("%d todo", "%d todos", stats.todos),
+	asprintf(&stats_str[2], ngettext("%d todo", "%d todos", stats.todos),
 		 stats.todos);
-	snprintf(stats_str[3], BUFSIZ, _("%d skipped"), stats.skipped);
+	asprintf(&stats_str[3], _("%d skipped"), stats.skipped);
 
 	if (ui_mode == UI_CURSES && conf.system_dialogs) {
-		char read[BUFSIZ], stat[BUFSIZ];
+		char *read, *stat;
 
-		snprintf(read, BUFSIZ, proc_report, stats.lines);
-		snprintf(stat, BUFSIZ, "%s / %s / %s / %s (%s)",
+		asprintf(&read, proc_report, stats.lines);
+		asprintf(&stat, "%s / %s / %s / %s (%s)",
 			 stats_str[0], stats_str[1], stats_str[2],
 			 stats_str[3], _("Press [ENTER] to continue"));
 		status_mesg(read, stat);
+		mem_free(read);
+		mem_free(stat);
 		wgetch(win[KEY].p);
 	} else if (ui_mode == UI_CMDLINE) {
 		printf(proc_report, stats.lines);
@@ -1128,16 +1124,20 @@ void io_import_data(enum import_type type, const char *stream_name)
 
 		io_log_display(log, view_log, conf.pager);
 	}
+
+	mem_free(stats_str[0]);
+	mem_free(stats_str[1]);
+	mem_free(stats_str[2]);
+	mem_free(stats_str[3]);
 	io_log_free(log);
 }
 
 struct io_file *io_log_init(void)
 {
-	char logprefix[BUFSIZ];
-	char *logname;
+	char *logprefix, *logname;
 	struct io_file *log;
 
-	snprintf(logprefix, BUFSIZ, "%s/calcurse_log.", get_tempdir());
+	asprintf(&logprefix, "%s/calcurse_log.", get_tempdir());
 	logname = new_tempfile(logprefix, TMPEXTSIZ);
 	RETVAL_IF(logname == NULL, 0,
 		  _("Warning: could not create temporary log file, Aborting..."));
@@ -1145,6 +1145,7 @@ struct io_file *io_log_init(void)
 	RETVAL_IF(log == NULL, 0,
 		  _("Warning: could not open temporary log file, Aborting..."));
 	snprintf(log->name, sizeof(log->name), "%s%s", logprefix, logname);
+	mem_free(logprefix);
 	mem_free(logname);
 	log->fd = fopen(log->name, "w");
 	if (log->fd == NULL) {
diff --git a/src/note.c b/src/note.c
index 882d1a6..ce627b9 100644
--- a/src/note.c
+++ b/src/note.c
@@ -59,17 +59,18 @@ HTABLE_PROTOTYPE(htp, note_gc_hash)
 char *generate_note(const char *str)
 {
 	char *sha1 = mem_malloc(SHA1_DIGESTLEN * 2 + 1);
-	char notepath[BUFSIZ];
+	char *notepath;
 	FILE *fp;
 
 	sha1_digest(str, sha1);
-	snprintf(notepath, BUFSIZ, "%s%s", path_notes, sha1);
+	asprintf(&notepath, "%s%s", path_notes, sha1);
 	fp = fopen(notepath, "w");
 	EXIT_IF(fp == NULL, _("Warning: could not open %s, Aborting..."),
 		notepath);
 	fputs(str, fp);
 	file_close(fp, __FILE_POS__);
 
+	mem_free(notepath);
 	return sha1;
 }
 
@@ -78,7 +79,7 @@ void edit_note(char **note, const char *editor)
 {
 	char tmppath[BUFSIZ];
 	char *tmpext;
-	char notepath[BUFSIZ];
+	char *notepath = NULL;
 	char *sha1 = mem_malloc(SHA1_DIGESTLEN * 2 + 1);
 	FILE *fp;
 
@@ -91,7 +92,7 @@ void edit_note(char **note, const char *editor)
 	mem_free(tmpext);
 
 	if (*note != NULL) {
-		snprintf(notepath, BUFSIZ, "%s%s", path_notes, *note);
+		asprintf(&notepath, "%s%s", path_notes, *note);
 		io_file_cp(notepath, tmppath);
 	}
 
@@ -105,8 +106,10 @@ void edit_note(char **note, const char *editor)
 		fclose(fp);
 		*note = sha1;
 
-		snprintf(notepath, BUFSIZ, "%s%s", path_notes, *note);
+		mem_free(notepath);
+		asprintf(&notepath, "%s%s", path_notes, *note);
 		io_file_cp(tmppath, notepath);
+		mem_free(notepath);
 	}
 
 	unlink(tmppath);
@@ -115,14 +118,16 @@ void edit_note(char **note, const char *editor)
 /* View a note in an external pager. */
 void view_note(const char *note, const char *pager)
 {
-	char fullname[BUFSIZ];
+	char *fullname;
 
 	if (note == NULL)
 		return;
-	snprintf(fullname, BUFSIZ, "%s%s", path_notes, note);
+	asprintf(&fullname, "%s%s", path_notes, note);
 
 	const char *arg[] = { pager, fullname, NULL };
 	wins_launch_external(arg);
+
+	mem_free(fullname);
 }
 
 /* Erase a note previously attached to an item. */
@@ -172,7 +177,7 @@ void note_gc(void)
 	struct dirent *dp;
 	llist_item_t *i;
 	struct note_gc_hash tmph;
-	char notepath[BUFSIZ];
+	char *notepath;
 
 	if (!(dirp = opendir(path_notes)))
 		return;
@@ -235,7 +240,8 @@ void note_gc(void)
 
 	/* Unlink unused note files. */
 	HTABLE_FOREACH(hp, htp, &gc_htable) {
-		snprintf(notepath, BUFSIZ, "%s%s", path_notes, hp->hash);
+		asprintf(&notepath, "%s%s", path_notes, hp->hash);
 		unlink(notepath);
+		mem_free(notepath);
 	}
 }
diff --git a/src/ui-calendar.c b/src/ui-calendar.c
index b24d555..bd8d7fe 100644
--- a/src/ui-calendar.c
+++ b/src/ui-calendar.c
@@ -629,7 +629,7 @@ void ui_calendar_change_day(int datefmt)
 {
 #define LDAY 11
 	char selected_day[LDAY] = "";
-	char outstr[BUFSIZ];
+	char *outstr;
 	int dday, dmonth, dyear;
 	int wrong_day = 1;
 	const char *mesg_line1 =
@@ -640,9 +640,9 @@ void ui_calendar_change_day(int datefmt)
 	    _("Enter the day to go to [ENTER for today] : %s");
 
 	while (wrong_day) {
-		snprintf(outstr, BUFSIZ, request_date,
-			 DATEFMT_DESC(datefmt));
+		asprintf(&outstr, request_date, DATEFMT_DESC(datefmt));
 		status_mesg(outstr, "");
+		mem_free(outstr);
 		if (getstring(win[STA].p, selected_day, LDAY, 0, 1) ==
 		    GETSTRING_ESC) {
 			return;
diff --git a/src/ui-day.c b/src/ui-day.c
index 269d818..39fa53c 100644
--- a/src/ui-day.c
+++ b/src/ui-day.c
@@ -156,8 +156,7 @@ static void update_rept(struct rpt **rpt, const long start)
 {
 	int newtype, newfreq;
 	long newuntil;
-	char outstr[BUFSIZ];
-	char *freqstr, *timstr;
+	char *freqstr = NULL, *timstr, *outstr = NULL;
 	const char *msg_rpt_prefix = _("Enter the new repetition type:");
 	const char *msg_rpt_daily = _("(d)aily");
 	const char *msg_rpt_weekly = _("(w)eekly");
@@ -166,7 +165,7 @@ static void update_rept(struct rpt **rpt, const long start)
 
 	/* Find the current repetition type. */
 	const char *rpt_current;
-	char msg_rpt_current[BUFSIZ];
+	char *msg_rpt_current;
 	switch (recur_def2char((*rpt)->type)) {
 	case 'D':
 		rpt_current = msg_rpt_daily;
@@ -185,15 +184,12 @@ static void update_rept(struct rpt **rpt, const long start)
 		rpt_current = msg_rpt_daily;
 	}
 
-	snprintf(msg_rpt_current, BUFSIZ, _("(currently using %s)"),
-		 rpt_current);
+	asprintf(&msg_rpt_current, _("(currently using %s)"), rpt_current);
 
-	char msg_rpt_asktype[BUFSIZ];
-	snprintf(msg_rpt_asktype, BUFSIZ, "%s %s, %s, %s, %s ? %s",
-		 msg_rpt_prefix,
-		 msg_rpt_daily,
-		 msg_rpt_weekly, msg_rpt_monthly, msg_rpt_yearly,
-		 msg_rpt_current);
+	char *msg_rpt_asktype;
+	asprintf(&msg_rpt_asktype, "%s %s, %s, %s, %s ? %s", msg_rpt_prefix,
+		 msg_rpt_daily, msg_rpt_weekly, msg_rpt_monthly,
+		 msg_rpt_yearly, msg_rpt_current);
 
 	const char *msg_rpt_choice = _("[dwmy]");
 	const char *msg_wrong_freq =
@@ -219,17 +215,16 @@ static void update_rept(struct rpt **rpt, const long start)
 		newtype = 'Y';
 		break;
 	default:
-		return;
+		goto cleanup;
 	}
 
 	do {
 		status_mesg(_("Enter the new repetition frequence:"), "");
-		freqstr = mem_malloc(BUFSIZ);
-		snprintf(freqstr, BUFSIZ, "%d", (*rpt)->freq);
+		asprintf(&freqstr, "%d", (*rpt)->freq);
 		if (updatestring(win[STA].p, &freqstr, 0, 1) !=
 		    GETSTRING_VALID) {
 			mem_free(freqstr);
-			return;
+			goto cleanup;
 		}
 		newfreq = atoi(freqstr);
 		mem_free(freqstr);
@@ -246,8 +241,7 @@ static void update_rept(struct rpt **rpt, const long start)
 		struct date new_date;
 		int newmonth, newday, newyear;
 
-		snprintf(outstr, BUFSIZ,
-			 _("Enter the new ending date: [%s] or '0'"),
+		asprintf(&outstr, _("Enter the new ending date: [%s] or '0'"),
 			 DATEFMT_DESC(conf.input_datefmt));
 		status_mesg(outstr, "");
 		timstr =
@@ -255,8 +249,7 @@ static void update_rept(struct rpt **rpt, const long start)
 				      DATEFMT(conf.input_datefmt));
 		if (updatestring(win[STA].p, &timstr, 0, 1) !=
 		    GETSTRING_VALID) {
-			mem_free(timstr);
-			return;
+			goto cleanup;
 		}
 		if (strcmp(timstr, "0") == 0) {
 			newuntil = 0;
@@ -265,7 +258,7 @@ static void update_rept(struct rpt **rpt, const long start)
 		if (!parse_date
 		    (timstr, conf.input_datefmt, &newyear, &newmonth,
 		     &newday, ui_calendar_get_slctd_day())) {
-			snprintf(outstr, BUFSIZ, msg_fmts,
+			asprintf(&outstr, msg_fmts,
 				 DATEFMT_DESC(conf.input_datefmt));
 			status_mesg(msg_wrong_date, outstr);
 			wgetch(win[KEY].p);
@@ -283,10 +276,16 @@ static void update_rept(struct rpt **rpt, const long start)
 		wgetch(win[KEY].p);
 	}
 
-	mem_free(timstr);
 	(*rpt)->type = recur_char2def(newtype);
 	(*rpt)->freq = newfreq;
 	(*rpt)->until = newuntil;
+
+cleanup:
+	mem_free(msg_rpt_current);
+	mem_free(msg_rpt_asktype);
+	mem_free(freqstr);
+	mem_free(outstr);
+	mem_free(timstr);
 }
 
 /* Edit an already existing item. */
@@ -650,7 +649,7 @@ void ui_day_item_repeat(void)
 	time_t t;
 	int year = 0, month = 0, day = 0;
 	struct date until_date;
-	char outstr[BUFSIZ];
+	char *outstr = NULL;
 	char user_input[BUFSIZ] = "";
 	const char *msg_rpt_prefix = _("Enter the repetition type:");
 	const char *msg_rpt_daily = _("(d)aily");
@@ -672,9 +671,8 @@ void ui_day_item_repeat(void)
 	const char *mesg_older =
 	    _("Sorry, the date you entered is older than the item start time.");
 
-	char msg_asktype[BUFSIZ];
-	snprintf(msg_asktype, BUFSIZ, "%s %s, %s, %s, %s",
-		 msg_rpt_prefix,
+	char *msg_asktype;
+	asprintf(&msg_asktype, "%s %s, %s, %s, %s", msg_rpt_prefix,
 		 msg_rpt_daily, msg_rpt_weekly, msg_rpt_monthly,
 		 msg_rpt_yearly);
 
@@ -685,14 +683,14 @@ void ui_day_item_repeat(void)
 	long until, date;
 
 	if (day_item_count(0) <= 0)
-		return;
+		goto cleanup;
 
 	item_nb = listbox_get_sel(&lb_apt);
 	p = day_get_item(item_nb);
 	if (p->type != APPT && p->type != EVNT) {
 		status_mesg(wrong_type_1, wrong_type_2);
 		wgetch(win[KEY].p);
-		return;
+		goto cleanup;
 	}
 
 	switch (status_ask_choice(msg_asktype, msg_type_choice, 4)) {
@@ -709,14 +707,14 @@ void ui_day_item_repeat(void)
 		type = RECUR_YEARLY;
 		break;
 	default:
-		return;
+		goto cleanup;
 	}
 
 	while (freq == 0) {
 		status_mesg(mesg_freq_1, "");
 		if (getstring(win[STA].p, user_input, BUFSIZ, 0, 1) !=
 		    GETSTRING_VALID)
-			return;
+			goto cleanup;
 		freq = atoi(user_input);
 		if (freq == 0) {
 			status_mesg(mesg_wrong_freq, wrong_type_2);
@@ -726,12 +724,12 @@ void ui_day_item_repeat(void)
 	}
 
 	for (;;) {
-		snprintf(outstr, BUFSIZ, mesg_until_1,
+		asprintf(&outstr, mesg_until_1,
 			 DATEFMT_DESC(conf.input_datefmt));
 		status_mesg(outstr, "");
 		if (getstring(win[STA].p, user_input, BUFSIZ, 0, 1) !=
 		    GETSTRING_VALID)
-			return;
+			goto cleanup;
 		if (strlen(user_input) == 1
 		    && strcmp(user_input, "0") == 0) {
 			until = 0;
@@ -752,7 +750,8 @@ void ui_day_item_repeat(void)
 			status_mesg(mesg_older, wrong_type_2);
 			wgetch(win[KEY].p);
 		} else {
-			snprintf(outstr, BUFSIZ, mesg_wrong_2,
+			mem_free(outstr);
+			asprintf(&outstr, mesg_wrong_2,
 				 DATEFMT_DESC(conf.input_datefmt));
 			status_mesg(mesg_wrong_1, outstr);
 			wgetch(win[KEY].p);
@@ -783,6 +782,10 @@ void ui_day_item_repeat(void)
 	io_set_modified();
 
 	ui_calendar_monthly_view_cache_set_invalid();
+
+cleanup:
+	mem_free(msg_asktype);
+	mem_free(outstr);
 }
 
 /* Free the current cut item, if any. */
diff --git a/src/utils.c b/src/utils.c
index c675518..34bdd5e 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -197,7 +197,7 @@ int status_ask_choice(const char *message, const char choice[],
 		      int nb_choice)
 {
 	int i, ch;
-	char tmp[BUFSIZ];
+	char *tmp;
 	/* "[4/2/f/t/w/.../Z] " */
 	char avail_choice[2 * nb_choice + 3];
 
@@ -205,9 +205,9 @@ int status_ask_choice(const char *message, const char choice[],
 	avail_choice[1] = '\0';
 
 	for (i = 1; i <= nb_choice; i++) {
-		snprintf(tmp, BUFSIZ, (i == nb_choice) ? "%c] " : "%c/",
-			 choice[i]);
+		asprintf(&tmp, (i == nb_choice) ? "%c] " : "%c/", choice[i]);
 		strcat(avail_choice, tmp);
+		mem_free(tmp);
 	}
 
 	status_mesg(message, avail_choice);
@@ -248,7 +248,7 @@ status_ask_simplechoice(const char *prefix, const char *choice[],
 			int nb_choice)
 {
 	int i;
-	char tmp[BUFSIZ];
+	char *tmp;
 	/* "(1) Choice1, (2) Choice2, (3) Choice3?" */
 	char choicestr[BUFSIZ];
 	/* Holds the characters to choose from ('1', '2', etc) */
@@ -261,10 +261,11 @@ status_ask_simplechoice(const char *prefix, const char *choice[],
 	strcpy(choicestr, prefix);
 
 	for (i = 0; i < nb_choice; i++) {
-		snprintf(tmp, BUFSIZ,
+		asprintf(&tmp,
 			 ((i + 1) == nb_choice) ? "(%d) %s?" : "(%d) %s, ",
 			 (i + 1), choice[i]);
 		strcat(choicestr, tmp);
+		mem_free(tmp);
 	}
 
 	return (status_ask_choice(choicestr, char_choice, nb_choice));
@@ -984,8 +985,7 @@ shell_exec(int *pfdin, int *pfdout, const char *path,
 	narg[1] = "-c";
 
 	if (argc > 1) {
-		arg0 = mem_malloc(strlen(path) + 6);
-		sprintf(arg0, "%s \"$@\"", path);
+		asprintf(&arg0, "%s \"$@\"", path);
 		narg[2] = arg0;
 
 		for (i = 0; i < argc; i++)
@@ -1049,7 +1049,7 @@ void press_any_key(void)
  */
 static void print_notefile(FILE * out, const char *filename, int nbtab)
 {
-	char path_to_notefile[BUFSIZ];
+	char *path_to_notefile;
 	FILE *notefile;
 	char linestarter[BUFSIZ];
 	char buffer[BUFSIZ];
@@ -1064,8 +1064,9 @@ static void print_notefile(FILE * out, const char *filename, int nbtab)
 		linestarter[0] = '\0';
 	}
 
-	snprintf(path_to_notefile, BUFSIZ, "%s/%s", path_notes, filename);
+	asprintf(&path_to_notefile, "%s/%s", path_notes, filename);
 	notefile = fopen(path_to_notefile, "r");
+	mem_free(path_to_notefile);
 	if (notefile) {
 		while (fgets(buffer, BUFSIZ, notefile) != 0) {
 			if (printlinestarter) {