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buffer: Add APIs for editing bytes in buffer

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This commit adds a few functions for getting at and
using the size, bytes, and capacity of a buffer.

This will make it easier to modify utf8 string on the side and
and update the buffer size afterward.
This commit is contained in:
Ray Strode 2023-12-10 10:09:37 -05:00
parent 73093a8411
commit 804a78860a
2 changed files with 31 additions and 0 deletions
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20
src/libply/ply-buffer.c
View file

@ -224,6 +224,20 @@ ply_buffer_append_from_fd (ply_buffer_t *buffer,
ply_buffer_append_bytes (buffer, bytes, bytes_read);
}
void
ply_buffer_set_bytes (ply_buffer_t *buffer,
void *bytes,
size_t number_of_bytes,
size_t capacity)
{
if (buffer->data != bytes)
free (buffer->data);
buffer->data = bytes;
buffer->size = number_of_bytes;
buffer->capacity = capacity;
}
const char *
ply_buffer_get_bytes (ply_buffer_t *buffer)
{
@ -246,6 +260,12 @@ ply_buffer_steal_bytes (ply_buffer_t *buffer)
return bytes;
}
size_t
ply_buffer_get_capacity (ply_buffer_t *buffer)
{
return buffer->capacity;
}
size_t
ply_buffer_get_size (ply_buffer_t *buffer)
{

11
src/libply/ply-buffer.h
View file

@ -44,12 +44,23 @@ __attribute__((__format__ (__printf__, 2, 3)))
void ply_buffer_append_with_non_literal_format_string (ply_buffer_t *buffer,
const char *format,
...);
void ply_buffer_set_bytes (ply_buffer_t *buffer,
void *bytes,
size_t number_of_bytes,
size_t capacity);
void ply_buffer_remove_bytes (ply_buffer_t *buffer,
size_t number_of_bytes);
void ply_buffer_remove_bytes_at_end (ply_buffer_t *buffer,
size_t number_of_bytes);
const char *ply_buffer_get_bytes (ply_buffer_t *buffer);
size_t ply_buffer_get_capacity (ply_buffer_t *buffer);
char *ply_buffer_steal_bytes (ply_buffer_t *buffer);
#define ply_buffer_borrow_bytes(buffer, bytes, size, capacity) \
for (bool _ran = false; *bytes = (char *) ply_buffer_get_bytes (buffer), \
*size = ply_buffer_get_size (buffer), \
*capacity = ply_buffer_get_capacity (buffer), \
!_ran; \
ply_buffer_set_bytes (buffer, *bytes, *size, *capacity), _ran = true)
size_t ply_buffer_get_size (ply_buffer_t *buffer);
void ply_buffer_clear (ply_buffer_t *buffer);
#endif