merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 109 insertions, 0 deletions

diff --git a/third_party/git/strvec.c b/third_party/git/strvec.c
new file mode 100644
index 000000000000..21dce0a7a4d2
--- /dev/null
+++ b/third_party/git/strvec.c
@@ -0,0 +1,109 @@
+#include "cache.h"
+#include "strvec.h"
+#include "strbuf.h"
+
+const char *empty_strvec[] = { NULL };
+
+void strvec_init(struct strvec *array)
+{
+	array->v = empty_strvec;
+	array->nr = 0;
+	array->alloc = 0;
+}
+
+static void strvec_push_nodup(struct strvec *array, const char *value)
+{
+	if (array->v == empty_strvec)
+		array->v = NULL;
+
+	ALLOC_GROW(array->v, array->nr + 2, array->alloc);
+	array->v[array->nr++] = value;
+	array->v[array->nr] = NULL;
+}
+
+const char *strvec_push(struct strvec *array, const char *value)
+{
+	strvec_push_nodup(array, xstrdup(value));
+	return array->v[array->nr - 1];
+}
+
+const char *strvec_pushf(struct strvec *array, const char *fmt, ...)
+{
+	va_list ap;
+	struct strbuf v = STRBUF_INIT;
+
+	va_start(ap, fmt);
+	strbuf_vaddf(&v, fmt, ap);
+	va_end(ap);
+
+	strvec_push_nodup(array, strbuf_detach(&v, NULL));
+	return array->v[array->nr - 1];
+}
+
+void strvec_pushl(struct strvec *array, ...)
+{
+	va_list ap;
+	const char *arg;
+
+	va_start(ap, array);
+	while ((arg = va_arg(ap, const char *)))
+		strvec_push(array, arg);
+	va_end(ap);
+}
+
+void strvec_pushv(struct strvec *array, const char **items)
+{
+	for (; *items; items++)
+		strvec_push(array, *items);
+}
+
+void strvec_pop(struct strvec *array)
+{
+	if (!array->nr)
+		return;
+	free((char *)array->v[array->nr - 1]);
+	array->v[array->nr - 1] = NULL;
+	array->nr--;
+}
+
+void strvec_split(struct strvec *array, const char *to_split)
+{
+	while (isspace(*to_split))
+		to_split++;
+	for (;;) {
+		const char *p = to_split;
+
+		if (!*p)
+			break;
+
+		while (*p && !isspace(*p))
+			p++;
+		strvec_push_nodup(array, xstrndup(to_split, p - to_split));
+
+		while (isspace(*p))
+			p++;
+		to_split = p;
+	}
+}
+
+void strvec_clear(struct strvec *array)
+{
+	if (array->v != empty_strvec) {
+		int i;
+		for (i = 0; i < array->nr; i++)
+			free((char *)array->v[i]);
+		free(array->v);
+	}
+	strvec_init(array);
+}
+
+const char **strvec_detach(struct strvec *array)
+{
+	if (array->v == empty_strvec)
+		return xcalloc(1, sizeof(const char *));
+	else {
+		const char **ret = array->v;
+		strvec_init(array);
+		return ret;
+	}
+}