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tools lib traceevent: Introduce extend_token()

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The __read_token() function has some duplicated code to handle
internal buffer overflow. Factor them out to new extend_token().

According to the man pages of realloc/free(3), they can handle NULL
pointer input so that it can be ended up to compact the code.  Also
handle error path correctly.

Signed-off-by: Namhyung Kim <namhyung.kim@lge.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1333940074-19052-4-git-send-email-namhyung.kim@lge.com
[rostedt@goodmis.org: added some extra whitespace]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Namhyung Kim 2012-04-09 11:54:30 +09:00 • committed by Namhyung Kim
parent 0fc45ef520
commit deba3fb26f
1 changed files with 26 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

54
tools/lib/traceevent/event-parse.c
View file

@ -781,6 +781,25 @@ int pevent_peek_char(void)
return __peek_char(); return __peek_char();
} }
static int extend_token(char **tok, char *buf, int size)
{
char *newtok = realloc(*tok, size);
if (!newtok) {
free(*tok);
*tok = NULL;
return -1;
}
if (!*tok)
strcpy(newtok, buf);
else
strcat(newtok, buf);
*tok = newtok;
return 0;
}
static enum event_type force_token(const char *str, char **tok); static enum event_type force_token(const char *str, char **tok);
static enum event_type __read_token(char **tok) static enum event_type __read_token(char **tok)
@ -865,17 +884,10 @@ static enum event_type __read_token(char **tok)
do { do {
if (i == (BUFSIZ - 1)) { if (i == (BUFSIZ - 1)) {
buf[i] = 0; buf[i] = 0;
if (*tok) {
*tok = realloc(*tok, tok_size + BUFSIZ);
if (!*tok)
return EVENT_NONE;
strcat(*tok, buf);
} else
*tok = strdup(buf);
if (!*tok)
return EVENT_NONE;
tok_size += BUFSIZ; tok_size += BUFSIZ;
if (extend_token(tok, buf, tok_size) < 0)
return EVENT_NONE;
i = 0; i = 0;
} }
last_ch = ch; last_ch = ch;
@ -914,17 +926,10 @@ static enum event_type __read_token(char **tok)
while (get_type(__peek_char()) == type) { while (get_type(__peek_char()) == type) {
if (i == (BUFSIZ - 1)) { if (i == (BUFSIZ - 1)) {
buf[i] = 0; buf[i] = 0;
if (*tok) {
*tok = realloc(*tok, tok_size + BUFSIZ);
if (!*tok)
return EVENT_NONE;
strcat(*tok, buf);
} else
*tok = strdup(buf);
if (!*tok)
return EVENT_NONE;
tok_size += BUFSIZ; tok_size += BUFSIZ;
if (extend_token(tok, buf, tok_size) < 0)
return EVENT_NONE;
i = 0; i = 0;
} }
ch = __read_char(); ch = __read_char();
@ -933,14 +938,7 @@ static enum event_type __read_token(char **tok)
out: out:
buf[i] = 0; buf[i] = 0;
if (*tok) { if (extend_token(tok, buf, tok_size + i + 1) < 0)
*tok = realloc(*tok, tok_size + i);
if (!*tok)
return EVENT_NONE;
strcat(*tok, buf);
} else
*tok = strdup(buf);
if (!*tok)
return EVENT_NONE; return EVENT_NONE;
if (type == EVENT_ITEM) { if (type == EVENT_ITEM) {