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string-table: add new DUMP_STRING_TABLE() macro

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The macro is inspired by the other string table macros, and takes the
same arguments in the same order and dumps a string table to stdout.
Since it's typesafe it's nice to implement this as macro rather than
regular function.

This new macro is useful for implementing commands such as "systemctl -t
help" and similar, i.e. wherever we want to dump all values of an enum
to stdout.
This commit is contained in:
Lennart Poettering 2018-05-22 12:06:54 +02:00
parent 930362ab26
commit d34f3bc4e5
1 changed files with 15 additions and 0 deletions
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15
src/basic/string-table.h
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@ -102,3 +102,18 @@ ssize_t string_table_lookup(const char * const *table, size_t len, const char *k
_DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,static)
#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max) \
_DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,static)
#define DUMP_STRING_TABLE(name,type,max) \
do { \
type _k; \
flockfile(stdout); \
for (_k = 0; _k < (max); _k++) { \
const char *_t; \
_t = name##_to_string(_k); \
if (!_t) \
continue; \
fputs_unlocked(_t, stdout); \
fputc_unlocked('\n', stdout); \
} \
funlockfile(stdout); \
} while(false)