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Remove VLA & calm Valgrind

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`MB_CUR_MAX` looks like a macro, but it's a function call and therefore
creates a VLA. We don't want that.

Also this array being uninitialized created the following Valgrind error

```
==503529== Conditional jump or move depends on uninitialised value(s)
==503529==    at 0x619F15E: waddnstr (lib_addstr.c:67)
==503529==    by 0x1929B7: _inp_write (inputwin.c:353)
==503529==    by 0x1937D5: _inp_redisplay (inputwin.c:619)
==503529==    by 0x61511B1: rl_forced_update_display (display.c:2693)
==503529==    by 0x193F9D: _inp_rl_send_to_editor (inputwin.c:957)
==503529==    by 0x614642F: _rl_dispatch_subseq (readline.c:916)
==503529==    by 0x6146C85: _rl_dispatch_callback (readline.c:823)
==503529==    by 0x616739F: rl_callback_read_char (callback.c:241)
==503529==    by 0x1923DB: inp_readline (inputwin.c:188)
==503529==    by 0x149860: prof_run (profanity.c:117)
==503529==    by 0x2283E8: main (main.c:186)
==503529==  Uninitialised value was created by a stack allocation
==503529==    at 0x1928B1: _inp_write (inputwin.c:334)
```

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
This commit is contained in:
Steffen Jaeckel 2023-05-11 11:20:52 +02:00 committed by Michael Vetter
parent 12d76e4a21
commit 197b839944
2 changed files with 10 additions and 1 deletions
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3
src/common.h
View File

@ -60,6 +60,9 @@ void auto_free_char(char** str);
#define STR_MAYBE_NULL(p) (p)
#endif
/* Our own define of MB_CUR_MAX but this time at compile time */
#define PROF_MB_CUR_MAX 8
// assume malloc stores at most 8 bytes for size of allocated memory
// and page size is at least 4KB
#define READ_BUF_SIZE 4088

8
src/ui/inputwin.c
View File

@ -36,6 +36,7 @@
#define _XOPEN_SOURCE_EXTENDED
#include "config.h"
#include <assert.h>
#include <stdio.h>
#include <sys/select.h>
#include <stdlib.h>
@ -140,6 +141,11 @@ static int _inp_rl_send_to_editor(int count, int key);
void
create_input_window(void)
{
/* MB_CUR_MAX is evaluated at runtime depending on the current
* locale, therefore we check that our own version is big enough
* and bail out if it isn't.
*/
assert(MB_CUR_MAX <= PROF_MB_CUR_MAX);
#ifdef NCURSES_REENTRANT
set_escdelay(25);
#else
@ -331,7 +337,7 @@ _inp_write(char* line, int offset)
for (size_t i = 0; line[i] != '\0'; i++) {
char* c = &line[i];
char retc[MB_CUR_MAX];
char retc[PROF_MB_CUR_MAX] = { 0 };
size_t ch_len = mbrlen(c, MB_CUR_MAX, NULL);
if ((ch_len == (size_t)-2) || (ch_len == (size_t)-1)) {