io-util: split out iovw_xyz into iovec-wrapper.h

Let's split these APIs out, they are kinda their own thing.

1 files changed, 131 insertions, 0 deletions

diff --git a/src/basic/iovec-wrapper.c b/src/basic/iovec-wrapper.c
new file mode 100644
index 0000000000..b335acd108
--- /dev/null
+++ b/src/basic/iovec-wrapper.c
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "iovec-util.h"
+#include "iovec-wrapper.h"
+#include "string-util.h"
+
+struct iovec_wrapper *iovw_new(void) {
+        return new0(struct iovec_wrapper, 1);
+}
+
+void iovw_free_contents(struct iovec_wrapper *iovw, bool free_vectors) {
+        assert(iovw);
+
+        if (free_vectors)
+                for (size_t i = 0; i < iovw->count; i++)
+                        free(iovw->iovec[i].iov_base);
+
+        iovw->iovec = mfree(iovw->iovec);
+        iovw->count = 0;
+}
+
+struct iovec_wrapper *iovw_free_free(struct iovec_wrapper *iovw) {
+        if (!iovw)
+                return NULL;
+
+        iovw_free_contents(iovw, /* free_vectors= */ true);
+        return mfree(iovw);
+}
+
+struct iovec_wrapper *iovw_free(struct iovec_wrapper *iovw) {
+        if (!iovw)
+                return NULL;
+
+        iovw_free_contents(iovw, /* free_vectors= */ false);
+        return mfree(iovw);
+}
+
+int iovw_put(struct iovec_wrapper *iovw, void *data, size_t len) {
+        assert(iovw);
+
+        if (len == 0)
+                return 0;
+
+        assert(data);
+
+        if (iovw->count >= IOV_MAX)
+                return -E2BIG;
+
+        if (!GREEDY_REALLOC(iovw->iovec, iovw->count + 1))
+                return -ENOMEM;
+
+        iovw->iovec[iovw->count++] = IOVEC_MAKE(data, len);
+        return 0;
+}
+
+int iovw_put_string_field(struct iovec_wrapper *iovw, const char *field, const char *value) {
+        _cleanup_free_ char *x = NULL;
+        int r;
+
+        assert(iovw);
+
+        x = strjoin(field, value);
+        if (!x)
+                return -ENOMEM;
+
+        r = iovw_put(iovw, x, strlen(x));
+        if (r >= 0)
+                TAKE_PTR(x);
+
+        return r;
+}
+
+int iovw_put_string_field_free(struct iovec_wrapper *iovw, const char *field, char *value) {
+        _cleanup_free_ _unused_ char *free_ptr = value;
+
+        return iovw_put_string_field(iovw, field, value);
+}
+
+void iovw_rebase(struct iovec_wrapper *iovw, void *old, void *new) {
+        assert(iovw);
+
+        FOREACH_ARRAY(i, iovw->iovec, iovw->count) {
+                assert(i->iov_base >= old);
+                i->iov_base = (uint8_t*) i->iov_base - (uint8_t*) old + (uint8_t*) new;
+        }
+}
+
+size_t iovw_size(const struct iovec_wrapper *iovw) {
+        if (!iovw)
+                return 0;
+
+        return iovec_total_size(iovw->iovec, iovw->count);
+}
+
+int iovw_append(struct iovec_wrapper *target, const struct iovec_wrapper *source) {
+        size_t original_count;
+        int r;
+
+        assert(target);
+
+        /* This duplicates the source and merges it into the target. */
+
+        if (iovw_isempty(source))
+                return 0;
+
+        original_count = target->count;
+
+        FOREACH_ARRAY(iovec, source->iovec, source->count) {
+                void *dup;
+
+                dup = memdup(iovec->iov_base, iovec->iov_len);
+                if (!dup) {
+                        r = -ENOMEM;
+                        goto rollback;
+                }
+
+                r = iovw_consume(target, dup, iovec->iov_len);
+                if (r < 0)
+                        goto rollback;
+        }
+
+        return 0;
+
+rollback:
+        for (size_t i = original_count; i < target->count; i++)
+                free(target->iovec[i].iov_base);
+
+        target->count = original_count;
+        return r;
+}