linux/tools/perf/util/quote.c
Masami Hiramatsu 70a6898fdc 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>
2016-05-10 11:56:52 -03:00

59 lines
1.3 KiB
C

#include "cache.h"
#include "quote.h"
/* Help to copy the thing properly quoted for the shell safety.
* any single quote is replaced with '\'', any exclamation point
* is replaced with '\!', and the whole thing is enclosed in a
*
* E.g.
* original sq_quote result
* name ==> name ==> 'name'
* a b ==> a b ==> 'a b'
* a'b ==> a'\''b ==> 'a'\''b'
* a!b ==> a'\!'b ==> 'a'\!'b'
*/
static inline int need_bs_quote(char c)
{
return (c == '\'' || c == '!');
}
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);
ret = strbuf_addch(dst, '\'');
while (!ret && *src) {
size_t len = strcspn(src, "'!");
ret = strbuf_add(dst, src, len);
src += len;
while (!ret && need_bs_quote(*src))
ret = strbuf_addf(dst, "'\\%c\'", *src++);
}
if (!ret)
ret = strbuf_addch(dst, '\'');
free(to_free);
return ret;
}
int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
{
int i, ret;
/* Copy into destination buffer. */
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;
}