perf util: Fix compression checks returning -1 as bool

The lzma_is_compressed and gzip_is_compressed functions are declared
to return a "bool" type, but in case of an error (e.g., file open
failure), they incorrectly returned -1.

A bool type is a boolean value that is either true or false.
Returning -1 for a bool return type can lead to unexpected behavior
and may violate strict type-checking in some compilers.

Fix the return value to be false in error cases, ensuring the function
adheres to its declared return type improves for preventing potential
bugs related to type mismatch.

Fixes: 4b57fd44b61beb51 ("perf tools: Add lzma_is_compressed function")
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Yunseong Kim <ysk@kzalloc.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Link: https://lore.kernel.org/r/20250822162506.316844-3-ysk@kzalloc.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c
index bbcd2ffcf4bd133f5e23d41f7137cefd95618295..c355757ed3911d572e3a939696449eb94661cd1a 100644 (file)
--- a/tools/perf/util/lzma.c
+++ b/tools/perf/util/lzma.c
@@ -120,7 +120,7 @@ bool lzma_is_compressed(const char *input)
        ssize_t rc;
 
        if (fd < 0)
-               return -1;
+               return false;
 
        rc = read(fd, buf, sizeof(buf));
        close(fd);

diff --git a/tools/perf/util/zlib.c b/tools/perf/util/zlib.c
index 78d2297c1b67463be02d2f7145da54d2b4dbf32d..1f7c065230599d8a37b51bcf4e27780b5856ef38 100644 (file)
--- a/tools/perf/util/zlib.c
+++ b/tools/perf/util/zlib.c
@@ -88,7 +88,7 @@ bool gzip_is_compressed(const char *input)
        ssize_t rc;
 
        if (fd < 0)
-               return -1;
+               return false;
 
        rc = read(fd, buf, sizeof(buf));
        close(fd);