diff options
| -rw-r--r-- | cbs.h | 17 |
1 files changed, 11 insertions, 6 deletions
@@ -209,13 +209,17 @@ static int cmdwait(pid_t); static void cmdput(cmd_t); static void cmdputf(FILE *, cmd_t); -/* Expand the environment variable s using /bin/sh expansion rules and store the - results in the given string vector. If the environment variable is NULL or - empty, then store the strings specified by the array p of length n. +/* Expand the environment variable s using /bin/sh expansion rules and append + the results in the given string vector. If the environment variable is NULL + or empty, then store the strings specified by the array p of length n. env_or_default() is the same as env_or_defaultv() but you provide p as - variadic arguments. */ -static void env_or_defaultv(struct strv *, const char *s, char **p, size_t n); + variadic arguments. + + If the pointer p is null, then no default value is appended to the given + string vector when the environment variable is not present. */ +static void env_or_defaultv(struct strv *, const char *s, char *_Nullable *p, + size_t n); #define env_or_default(sv, s, ...) \ env_or_defaultv((sv), (s), _vtoa(__VA_ARGS__), lengthof(_vtoa(__VA_ARGS__))) @@ -616,7 +620,8 @@ env_or_defaultv(struct strv *sv, const char *s, char **p, size_t n) p = we.we_wordv; n = we.we_wordc; - } + } else if (!p) + return; sv->buf = bufalloc(sv->buf, sv->len + n, sizeof(*sv->buf)); for (size_t i = 0; i < n; i++) { |