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logger: reduce the number of appending snprintf calls

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Write the timestamp and location into a temporary buffer, then include them in
the message print. This makes bugs involving size vs length less likely and
provides a fixed limit for how much space the filename can take in the
message.
This commit is contained in:
Peter Hutterer 2021-06-04 14:21:38 +10:00 • committed by Wim Taymans
parent b142e7f09f
commit 1a710cad3c
1 changed files with 7 additions and 5 deletions
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12
spa/plugins/support/logger.c
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@ -78,6 +78,8 @@ impl_log_logv(void *object,
#define RESERVED_LENGTH 24
struct impl *impl = object;
char timestamp[19] = {0};
char filename[64] = {0};
char location[1000 + RESERVED_LENGTH], *p, *s;
static const char *levels[] = { "-", "E", "W", "I", "D", "T", "*T*" };
const char *prefix = "", *suffix = "";
@ -101,21 +103,21 @@ impl_log_logv(void *object,
p = location;
len = sizeof(location) - RESERVED_LENGTH;
size = spa_scnprintf(p, len, "%s[%s]", prefix, levels[level]);
if (impl->timestamp) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC_RAW, &now);
size += spa_scnprintf(p + size, len - size, "[%09lu.%06lu]",
spa_scnprintf(timestamp, sizeof(timestamp), "[%09lu.%06lu]",
now.tv_sec & 0x1FFFFFFF, now.tv_nsec / 1000);
}
if (impl->line && line != 0) {
s = strrchr(file, '/');
size += spa_scnprintf(p + size, len - size, "[%s:%i %s()]",
spa_scnprintf(filename, sizeof(filename), "[%s:%i %s()]",
s ? s + 1 : file, line, func);
}
size += spa_scnprintf(p + size, len - size, " ");
size = spa_scnprintf(p, len, "%s[%s]%s%s", prefix, levels[level],
timestamp, filename);
/*
* it is assumed that at this point `size` <= `len`,
* which is reasonable as long as file names and function names