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| author | Lennart Poettering <lennart@poettering.net> | 2013-10-29 19:53:43 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2013-10-29 19:53:43 +0100 |
| commit | 250a918dc4c8a15d927deecc3b3f6a0604657ae4 (patch) | |
| tree | 18faf995d700c26c67ad500b81e7cce007bc0b95 /src/shared/strv.h | |
| parent | 7b1132f60d2a447c31556c23ea90ea31447ac557 (diff) | |
strv: introduce new strv_from_stdarg_alloca() macro to generate a string array from stdarg function parameters
This allows us to turn lists of strings passed in easily into string
arrays without having to allocate memory.
Diffstat (limited to 'src/shared/strv.h')
| -rw-r--r-- | src/shared/strv.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/shared/strv.h b/src/shared/strv.h index cccf2e6a92..737728a3c6 100644 --- a/src/shared/strv.h +++ b/src/shared/strv.h @@ -85,3 +85,32 @@ bool strv_overlap(char **a, char **b) _pure_; char **strv_sort(char **l); void strv_print(char **l); + +#define strv_from_stdarg_alloca(first) \ + ({ \ + char **_l; \ + \ + if (!first) \ + _l = ((char*[1]) { NULL }); \ + else { \ + unsigned _n; \ + va_list _ap; \ + \ + _n = 1; \ + va_start(_ap, first); \ + while (va_arg(_ap, char*)) \ + _n++; \ + va_end(_ap); \ + \ + _l = newa(char*, _n+1); \ + _l[_n = 0] = (char*) first; \ + va_start(_ap, first); \ + for (;;) { \ + _l[++_n] = va_arg(_ap, char*); \ + if (!_l[_n]) \ + break; \ + } \ + va_end(_ap); \ + } \ + _l; \ + }) |