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io-util: introduce iovw_append() helper function

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This commit is contained in:
Yu Watanabe 2023-08-11 04:46:00 +09:00
parent bf77d59772
commit 3746131aac
2 changed files with 38 additions and 0 deletions
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37
src/basic/io-util.c
View File

@ -374,6 +374,43 @@ size_t iovw_size(struct iovec_wrapper *iovw) {
return n;
}
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 (!source || source->count == 0)
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;
}
void iovec_array_free(struct iovec *iov, size_t n) {
if (!iov)
return;

1
src/basic/io-util.h
View File

@ -111,5 +111,6 @@ int iovw_put_string_field(struct iovec_wrapper *iovw, const char *field, const c
int iovw_put_string_field_free(struct iovec_wrapper *iovw, const char *field, char *value);
void iovw_rebase(struct iovec_wrapper *iovw, char *old, char *new);
size_t iovw_size(struct iovec_wrapper *iovw);
int iovw_append(struct iovec_wrapper *target, const struct iovec_wrapper *source);
void iovec_array_free(struct iovec *iov, size_t n);