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util/Alloc: add fallback for gcc 4.6

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This commit is contained in:
Max Kellermann 2014-11-28 19:44:32 +01:00
parent 16a99ad515
commit 849b0563ce
1 changed files with 21 additions and 0 deletions
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21
src/util/Alloc.cxx
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@ -75,6 +75,8 @@ xstrndup(const char *s, size_t n)
return p;
}
#if CLANG_OR_GCC_VERSION(4,7)
template<typename... Args>
static inline size_t
FillLengths(size_t *lengths, const char *a, Args&&... args)
@ -104,11 +106,14 @@ StringCat(char *p, const size_t *lengths, const char *a)
memcpy(p, a, *lengths);
}
#endif
template<typename... Args>
gcc_malloc gcc_nonnull_all
static inline char *
t_xstrcatdup(Args&&... args)
{
#if CLANG_OR_GCC_VERSION(4,7)
constexpr size_t n = sizeof...(args);
size_t lengths[n];
@ -118,6 +123,22 @@ t_xstrcatdup(Args&&... args)
StringCat(p, lengths, args...);
p[total] = 0;
return p;
#else
/* fallback implementation for gcc 4.6, because that old
compiler is too buggy to compile the above template
functions */
const char *const argv[] = { args... };
size_t total = 0;
for (auto i : argv)
total += strlen(i);
char *p = (char *)xalloc(total + 1), *q = p;
for (auto i : argv)
q = stpcpy(q, i);
return p;
#endif
}
char *