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AP_Common: missing: Add definition for strndupa

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`strndupa` is only available when using the GNU GCC suite.
With this definition is possible to use the MUSL compiler.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>
This commit is contained in:
Patrick José Pereira 2020-07-06 10:56:46 -03:00 committed by Lucas De Marchi
parent 5746943f50
commit 6e24880f87
1 changed files with 15 additions and 0 deletions
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15
libraries/AP_Common/missing/string.h Normal file
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#include_next <string.h>
// Necessary for toolchains that does not provide `strndupa`, such as musl.
#if !defined(HAVE_DECL_STRNDUPA) && !defined(strndupa)
// The last value of the GCC extension "statement exprs" will be
// evaluated and returned, E.g: `#define foo(n) ({ n; })` is equivalent for
// `auto foo(auto n) { return n; }`
#define strndupa(old_string, len) \
({ \
const size_t string_len = strnlen(old_string, len); \
char *new_string = static_cast<char*>(alloca(string_len + 1)); \
new_string[string_len] = '\0'; \
static_cast<char*>(memcpy(new_string, old_string, len)); \
})
#endif