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perf tools: Make alias handler to check return value of strbuf 

Make alias handler and sq_quote_argv to check the return value of strbuf
APIs.

In sq_quote_argv() calls die(), but this fix handles strbuf failure as a
special case and returns to caller, since the caller - handle_alias()
also has to check the return value of other strbuf APIs and those checks
can be merged to one if() statement.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054725.6158.84597.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2016-05-10 14:47:26 +09:00 committed by Arnaldo Carvalho de Melo
parent b72ca40390
commit 70a6898fdc
3 changed files with 26 additions and 20 deletions
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8
tools/perf/perf.c
View File

@ -309,9 +309,11 @@ static int handle_alias(int *argcp, const char ***argv)
if (*argcp > 1) {
struct strbuf buf;
strbuf_init(&buf, PATH_MAX);
strbuf_addstr(&buf, alias_string);
sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
if (strbuf_init(&buf, PATH_MAX) < 0 ||
strbuf_addstr(&buf, alias_string) < 0 ||
sq_quote_argv(&buf, (*argv) + 1,
PATH_MAX) < 0)
die("Failed to allocate memory.");
free(alias_string);
alias_string = buf.buf;
}

36
tools/perf/util/quote.c
View File

@ -17,38 +17,42 @@ static inline int need_bs_quote(char c)
return (c == '\'' || c == '!');
}
static void sq_quote_buf(struct strbuf *dst, const char *src)
static int sq_quote_buf(struct strbuf *dst, const char *src)
{
char *to_free = NULL;
int ret;
if (dst->buf == src)
to_free = strbuf_detach(dst, NULL);
strbuf_addch(dst, '\'');
while (*src) {
ret = strbuf_addch(dst, '\'');
while (!ret && *src) {
size_t len = strcspn(src, "'!");
strbuf_add(dst, src, len);
ret = strbuf_add(dst, src, len);
src += len;
while (need_bs_quote(*src)) {
strbuf_addstr(dst, "'\\");
strbuf_addch(dst, *src++);
strbuf_addch(dst, '\'');
}
while (!ret && need_bs_quote(*src))
ret = strbuf_addf(dst, "'\\%c\'", *src++);
}
strbuf_addch(dst, '\'');
if (!ret)
ret = strbuf_addch(dst, '\'');
free(to_free);
return ret;
}
void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
{
int i;
int i, ret;
/* Copy into destination buffer. */
strbuf_grow(dst, 255);
for (i = 0; argv[i]; ++i) {
strbuf_addch(dst, ' ');
sq_quote_buf(dst, argv[i]);
ret = strbuf_grow(dst, 255);
for (i = 0; !ret && argv[i]; ++i) {
ret = strbuf_addch(dst, ' ');
if (ret)
break;
ret = sq_quote_buf(dst, argv[i]);
if (maxlen && dst->len > maxlen)
die("Too many or long arguments");
}
return ret;
}

2
tools/perf/util/quote.h
View File

@ -24,6 +24,6 @@
* sq_quote() in a real application.
*/
void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
int sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
#endif /* __PERF_QUOTE_H */