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buffer: Add and use ssh_buffer_allocate_size()

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Add a small helper for ssh_buffer to ensure that the buffer has a
certain amount of space already preallocated. This can be useful in case
it is known how much data is going to be added to a buffer, to avoid
multiple reallocations.

Make use of it in few places in the library.

Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Pino Toscano
2018-06-27 14:10:26 +02:00
committed by Andreas Schneider
parent afa4021ded
commit 12284b75fa
6 changed files with 221 additions and 0 deletions
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include/libssh/buffer.h
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@@ -51,6 +51,7 @@ int ssh_buffer_add_u64(ssh_buffer buffer, uint64_t data);
int ssh_buffer_validate_length(struct ssh_buffer_struct *buffer, size_t len);
void *ssh_buffer_allocate(struct ssh_buffer_struct *buffer, uint32_t len);
int ssh_buffer_allocate_size(struct ssh_buffer_struct *buffer, uint32_t len);
int ssh_buffer_pack_va(struct ssh_buffer_struct *buffer,
const char *format,
int argc,