From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org, linux-trace-devel@vger.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Jaewon Kim <jaewon31.kim@samsung.com>,
Vlastimil Babka <vbabka@suse.cz>,
Kees Cook <keescook@chromium.org>
Subject: [PATCH 1/3] tools lib traceevent: Add append() function helper for appending strings
Date: Tue, 24 Mar 2020 16:08:46 -0400 [thread overview]
Message-ID: <20200324200956.515118403@goodmis.org> (raw)
In-Reply-To: 20200324200845.763565368@goodmis.org
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
There's several locations that open code realloc and strcat() to append text
to strings. Add an append() function that takes a delimiter and a string to
append to another string.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
tools/lib/traceevent/event-parse.c | 98 ++++++++++++------------------
1 file changed, 40 insertions(+), 58 deletions(-)
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index e1bd2a93c6db..eec96c31ea9e 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -1425,6 +1425,19 @@ static unsigned int type_size(const char *name)
return 0;
}
+static int append(char **buf, const char *delim, const char *str)
+{
+ char *new_buf;
+
+ new_buf = realloc(*buf, strlen(*buf) + strlen(delim) + strlen(str) + 1);
+ if (!new_buf)
+ return -1;
+ strcat(new_buf, delim);
+ strcat(new_buf, str);
+ *buf = new_buf;
+ return 0;
+}
+
static int event_read_fields(struct tep_event *event, struct tep_format_field **fields)
{
struct tep_format_field *field = NULL;
@@ -1432,6 +1445,7 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
char *token;
char *last_token;
int count = 0;
+ int ret;
do {
unsigned int size_dynamic = 0;
@@ -1490,24 +1504,15 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
field->flags |= TEP_FIELD_IS_POINTER;
if (field->type) {
- char *new_type;
- new_type = realloc(field->type,
- strlen(field->type) +
- strlen(last_token) + 2);
- if (!new_type) {
- free(last_token);
- goto fail;
- }
- field->type = new_type;
- strcat(field->type, " ");
- strcat(field->type, last_token);
+ ret = append(&field->type, " ", last_token);
free(last_token);
+ if (ret < 0)
+ goto fail;
} else
field->type = last_token;
last_token = token;
continue;
}
-
break;
}
@@ -1523,8 +1528,6 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
if (strcmp(token, "[") == 0) {
enum tep_event_type last_type = type;
char *brackets = token;
- char *new_brackets;
- int len;
field->flags |= TEP_FIELD_IS_ARRAY;
@@ -1536,29 +1539,27 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
field->arraylen = 0;
while (strcmp(token, "]") != 0) {
+ const char *delim;
+
if (last_type == TEP_EVENT_ITEM &&
type == TEP_EVENT_ITEM)
- len = 2;
+ delim = " ";
else
- len = 1;
+ delim = "";
+
last_type = type;
- new_brackets = realloc(brackets,
- strlen(brackets) +
- strlen(token) + len);
- if (!new_brackets) {
+ ret = append(&brackets, delim, token);
+ if (ret < 0) {
free(brackets);
goto fail;
}
- brackets = new_brackets;
- if (len == 2)
- strcat(brackets, " ");
- strcat(brackets, token);
/* We only care about the last token */
field->arraylen = strtoul(token, NULL, 0);
free_token(token);
type = read_token(&token);
if (type == TEP_EVENT_NONE) {
+ free(brackets);
do_warning_event(event, "failed to find token");
goto fail;
}
@@ -1566,13 +1567,11 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
free_token(token);
- new_brackets = realloc(brackets, strlen(brackets) + 2);
- if (!new_brackets) {
+ ret = append(&brackets, "", "]");
+ if (ret < 0) {
free(brackets);
goto fail;
}
- brackets = new_brackets;
- strcat(brackets, "]");
/* add brackets to type */
@@ -1582,34 +1581,23 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field **
* the format: type [] item;
*/
if (type == TEP_EVENT_ITEM) {
- char *new_type;
- new_type = realloc(field->type,
- strlen(field->type) +
- strlen(field->name) +
- strlen(brackets) + 2);
- if (!new_type) {
+ ret = append(&field->type, " ", field->name);
+ if (ret < 0) {
free(brackets);
goto fail;
}
- field->type = new_type;
- strcat(field->type, " ");
- strcat(field->type, field->name);
+ ret = append(&field->type, "", brackets);
+
size_dynamic = type_size(field->name);
free_token(field->name);
- strcat(field->type, brackets);
field->name = field->alias = token;
type = read_token(&token);
} else {
- char *new_type;
- new_type = realloc(field->type,
- strlen(field->type) +
- strlen(brackets) + 1);
- if (!new_type) {
+ ret = append(&field->type, "", brackets);
+ if (ret < 0) {
free(brackets);
goto fail;
}
- field->type = new_type;
- strcat(field->type, brackets);
}
free(brackets);
}
@@ -2046,19 +2034,16 @@ process_op(struct tep_event *event, struct tep_print_arg *arg, char **tok)
/* could just be a type pointer */
if ((strcmp(arg->op.op, "*") == 0) &&
type == TEP_EVENT_DELIM && (strcmp(token, ")") == 0)) {
- char *new_atom;
+ int ret;
if (left->type != TEP_PRINT_ATOM) {
do_warning_event(event, "bad pointer type");
goto out_free;
}
- new_atom = realloc(left->atom.atom,
- strlen(left->atom.atom) + 3);
- if (!new_atom)
+ ret = append(&left->atom.atom, " ", "*");
+ if (ret < 0)
goto out_warn_free;
- left->atom.atom = new_atom;
- strcat(left->atom.atom, " *");
free(arg->op.op);
*arg = *left;
free(left);
@@ -3151,18 +3136,15 @@ process_arg_token(struct tep_event *event, struct tep_print_arg *arg,
}
/* atoms can be more than one token long */
while (type == TEP_EVENT_ITEM) {
- char *new_atom;
- new_atom = realloc(atom,
- strlen(atom) + strlen(token) + 2);
- if (!new_atom) {
+ int ret;
+
+ ret = append(&atom, " ", token);
+ if (ret < 0) {
free(atom);
*tok = NULL;
free_token(token);
return TEP_EVENT_ERROR;
}
- atom = new_atom;
- strcat(atom, " ");
- strcat(atom, token);
free_token(token);
type = read_token_item(&token);
}
--
2.25.1
next prev parent reply other threads:[~2020-03-24 20:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 20:08 [PATCH 0/3] tool lib traceevent: Fix some parsing errors Steven Rostedt
2020-03-24 20:08 ` Steven Rostedt [this message]
2020-03-24 20:08 ` [PATCH 2/3] tools lib traceevent: Handle __attribute__((user)) in field names Steven Rostedt
2020-03-24 20:08 ` [PATCH 3/3] tools lib traceevent: Add handler for __builtin_expect() Steven Rostedt
2020-06-17 21:28 ` [PATCH 0/3] tool lib traceevent: Fix some parsing errors Steven Rostedt
2020-06-17 22:55 ` Arnaldo Carvalho de Melo
2020-06-17 22:55 ` Arnaldo Carvalho de Melo
2020-06-18 13:24 ` Arnaldo Carvalho de Melo
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