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msg: use dynamic buffer for message formatting

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Until now, a rather large stack buffer was used for this, and also a
static buffer in mp_log_root. The latter was added to buffer partial
lines, and the stack buffer was used only for MSGL_STATUS and MSGL_STATS
(I guess because these are the most likely/severe to clash with partial
line buffering).

Make the buffer in mp_log_root dynamically sized, so we don't get cut
off log lines if the text is excessively large. (The OpenGL extension
list dumped by vo_opengl is such an example.)

Since we still have to support partial line buffering (FFmpeg's log
callbacks leave no other choice), keep the stack buffer. But make it
smaller; there's no way all ~6KB are going to be needed in any
situation.
This commit is contained in:
wm4 2016-03-01 21:51:59 +01:00
parent 33774e18ed
commit e094499197
1 changed files with 18 additions and 10 deletions

28
common/msg.c
View File

@ -41,9 +41,6 @@
#include "msg.h"
#include "msg_control.h"
/* maximum message length of mp_msg */
#define MSGSIZE_MAX 6144
struct mp_log_root {
struct mpv_global *global;
// --- protected by mp_msg_lock
@ -67,7 +64,7 @@ struct mp_log_root {
* synchronized mp_log tree.) */
atomic_ulong reload_counter;
// --- protected by mp_msg_lock
char buffer[MSGSIZE_MAX];
char *buffer;
};
struct mp_log {
@ -337,17 +334,27 @@ void mp_msg_va(struct mp_log *log, int lev, const char *format, va_list va)
pthread_mutex_lock(&mp_msg_lock);
char tmp[MSGSIZE_MAX];
// MSGL_STATUS and MSGL_STATS use their own buffer; this prevents clashes
// with mp_msg() users which do not properly send complete lines only.
char tmp[256];
bool use_tmp = lev == MSGL_STATUS || lev == MSGL_STATS;
struct mp_log_root *root = log->root;
char *text = use_tmp ? tmp : root->buffer;
int len = use_tmp ? 0 : strlen(text);
int max_len = use_tmp ? sizeof(tmp) : talloc_get_size(text);
if (vsnprintf(text + len, MSGSIZE_MAX - len, format, va) < 0)
snprintf(text + len, MSGSIZE_MAX - len, "[fprintf error]\n");
text[MSGSIZE_MAX - 2] = '\n';
text[MSGSIZE_MAX - 1] = 0;
va_list t;
va_copy(t, va);
int res = vsnprintf(text + len, max_len - len, format, t);
if (res >= 0 && res >= max_len - len && !use_tmp) {
root->buffer = talloc_realloc(root, root->buffer, char, res + len + 1);
text = root->buffer;
max_len = talloc_get_size(text);
res = vsnprintf(text + len, max_len - len, format, va);
}
if (res < 0)
text = "[fprintf error]\n";
if (lev == MSGL_STATS) {
dump_stats(log, lev, text);
@ -376,7 +383,7 @@ void mp_msg_va(struct mp_log *log, int lev, const char *format, va_list va)
if (lev == MSGL_STATUS) {
if (text[0]) {
len = strlen(text);
if (len < MSGSIZE_MAX - 1) {
if (len < max_len - 1) {
text[len] = root->termosd ? '\r' : '\n';
text[len + 1] = '\0';
}
@ -441,6 +448,7 @@ void mp_msg_init(struct mpv_global *global)
*root = (struct mp_log_root){
.global = global,
.reload_counter = ATOMIC_VAR_INIT(1),
.buffer = talloc_strdup(root, ""),
};
struct mp_log dummy = { .root = root };