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Add __attribute__(format)s for our varargs printf/scanf wrappers

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It turns out that if you set the third argument of
__attribute__(format) to 0, GCC and Clang will check the format
argument without expecting to find variadic arguments.  This is the
correct behavior for vsnprintf, vasprintf, and vscanf.

I'm hoping this will fix bug 5969 (a clang warning) by telling clang that
the format argument to tor_vasprintf is indeed a format string.
This commit is contained in:
Nick Mathewson 2012-05-30 12:14:38 -04:00
parent 75fc4dbbca
commit e284894672
3 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
changes/bug5969_022 Normal file
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@ -0,0 +1,7 @@
o Minor bugfixes
- Fix a build warning with Clang 3.1 related to our use of vasprint.
Fix for bug 5969. Bugfix on 0.2.2.11-alpha.
o Compilation improvements:
- Tell GCC and Clang to check for any errors in format strings passed
to the tor_v*(print|scan)f functions.

5
src/common/compat.h
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@ -261,11 +261,12 @@ void tor_munmap_file(tor_mmap_t *handle) ATTR_NONNULL((1));
int tor_snprintf(char *str, size_t size, const char *format, ...)
CHECK_PRINTF(3,4) ATTR_NONNULL((1,3));
int tor_vsnprintf(char *str, size_t size, const char *format, va_list args)
ATTR_NONNULL((1,3));
CHECK_PRINTF(3,0) ATTR_NONNULL((1,3));
int tor_asprintf(char **strp, const char *fmt, ...)
CHECK_PRINTF(2,3);
int tor_vasprintf(char **strp, const char *fmt, va_list args);
int tor_vasprintf(char **strp, const char *fmt, va_list args)
CHECK_PRINTF(2,0);
const void *tor_memmem(const void *haystack, size_t hlen, const void *needle,
size_t nlen) ATTR_PURE ATTR_NONNULL((1,3));

6
src/common/util.h
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@ -211,7 +211,11 @@ const char *escaped(const char *string);
struct smartlist_t;
void wrap_string(struct smartlist_t *out, const char *string, size_t width,
const char *prefix0, const char *prefixRest);
int tor_vsscanf(const char *buf, const char *pattern, va_list ap);
int tor_vsscanf(const char *buf, const char *pattern, va_list ap)
#ifdef __GNUC__
__attribute__((format(scanf, 2, 0)))
#endif
;
int tor_sscanf(const char *buf, const char *pattern, ...)
#ifdef __GNUC__
__attribute__((format(scanf, 2, 3)))