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Add "buffer management" and "shrink" API calls to vstr.

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vstr is initially intended to deal with arbitrary-length strings. By
providing a bit lower-level API calls, it will be also useful to deal
with arbitrary-length I/O buffers (the difference from strings is that
buffers are filled from "outside", via I/O).

Another issue, especially aggravated by I/O buffer use, is alloc size
vs actual size length. If allocated 1Mb for buffer, but actually
read 1 byte, we don't want to keep rest of 1Mb be locked by this I/O
result, but rather return it to heap ASAP ("shrink" buffer before passing
it to qstr_from_str_take()).
This commit is contained in:
Paul Sokolovsky
2014-01-13 23:15:23 +02:00
parent ca318bba0d
commit 5d2499c638
4 changed files with 49 additions and 6 deletions
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6
py/misc.h
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@@ -58,15 +58,19 @@ typedef struct _vstr_t {
bool had_error;
} vstr_t;
void vstr_init(vstr_t *vstr);
void vstr_init(vstr_t *vstr, int alloc);
void vstr_clear(vstr_t *vstr);
vstr_t *vstr_new(void);
vstr_t *vstr_new_size(int alloc);
void vstr_free(vstr_t *vstr);
void vstr_reset(vstr_t *vstr);
bool vstr_had_error(vstr_t *vstr);
char *vstr_str(vstr_t *vstr);
int vstr_len(vstr_t *vstr);
void vstr_hint_size(vstr_t *vstr, int size);
char *vstr_extend(vstr_t *vstr, int size);
bool vstr_set_size(vstr_t *vstr, int size);
bool vstr_shrink(vstr_t *vstr);
char *vstr_add_len(vstr_t *vstr, int len);
void vstr_add_byte(vstr_t *vstr, byte v);
void vstr_add_char(vstr_t *vstr, unichar chr);