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Don't redefine str(n)casecmp on windows unless they're missing

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When we do redefine them, use inline functions instead of #define.

This fixes a latent code problem in our redefinition of these
functions, which was exposed by our refactoring: Previously, we
would #define strcasecmp after string.h was included, so nothing bad
would happen.  But when we refactored, we would sometimes #define it
first, which was a problem on mingw, whose headers contain
(approximately):

inline int strcasecmp (const char *a, const char *b)
   { return _stricmp(a,b); }

Our define turned this into:
  inline int _stricmp(const char *a, const char *b)
    { return _stricmp(a,b); }

And GCC would correctly infer that this function would loop forever,
rather than actually comparing anything.  This caused bug 26594.

Fixes bug 26594; bug not in any released version of Tor.
This commit is contained in:
Nick Mathewson 2018-07-02 11:50:17 -04:00
parent cb1a3674eb
commit c8ccd028a7
2 changed files with 16 additions and 3 deletions
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2
configure.ac
View File

@ -610,6 +610,8 @@ AC_CHECK_FUNCS(
sigaction \
socketpair \
statvfs \
strncasecmp \
strcasecmp \
strlcat \
strlcpy \
strnlen \

17
src/lib/string/compat_string.h
View File

@ -13,9 +13,20 @@
/* ===== String compatibility */
#ifdef _WIN32
/* Windows names string functions differently from most other platforms. */
#define strncasecmp _strnicmp
#define strcasecmp _stricmp
/* Windows doesn't have str(n)casecmp, but mingw defines it: only define it
* ourselves if it's missing. */
#ifndef HAVE_STRNCASECMP
static inline int strncasecmp(const char *a, const char *b, size_t n);
static inline int strncasecmp(const char *a, const char *b, size_t n) {
return strncmpi(a,b);
}
#endif
#ifndef HAVE_STRCASECMP
static inline int strcasecmp(const char *a, const char *b, size_t n);
static inline int strcasecmp(const char *a, const char *b, size_t n) {
return strcmpi(a,b);
}
#endif
#endif
#if defined __APPLE__