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-rw-r--r--cbs.h41
1 files changed, 22 insertions, 19 deletions
diff --git a/cbs.h b/cbs.h
index b94f7b7..bcf82df 100644
--- a/cbs.h
+++ b/cbs.h
@@ -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__)))
@@ -614,21 +618,20 @@ env_or_defaultv(struct strv *sv, const char *s, char **p, size_t n)
die("wordexp");
}
- sv->buf = bufalloc(NULL, we.we_wordc, sizeof(*sv->buf));
- for (size_t i = 0; i < we.we_wordc; i++) {
- if (!(sv->buf[i] = strdup(we.we_wordv[i])))
- die("strdup");
- }
- sv->len = we.we_wordc;
- wordfree(&we);
- } else {
- sv->buf = bufalloc(NULL, n, sizeof(*sv->buf));
- for (size_t i = 0; i < n; i++) {
- if (!(sv->buf[i] = strdup(p[i])))
- die("strdup");
- }
- sv->len = 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++) {
+ if (!(sv->buf[sv->len + i] = strdup(p[i])))
+ die("strdup");
}
+ sv->len += n;
+
+ if (ev && *ev)
+ wordfree(&we);
}
bool