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#include "buffer.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
/* hoedown_buffer_init: initialize a buffer with custom allocators */
void
hoedown_buffer_init(
hoedown_buffer *buf,
size_t unit,
hoedown_realloc_callback data_realloc,
hoedown_free_callback data_free,
hoedown_free_callback buffer_free)
{
if (!buf)
return;
buf->data = NULL;
buf->size = buf->asize = 0;
buf->unit = unit;
buf->data_realloc = data_realloc;
buf->data_free = data_free;
buf->buffer_free = buffer_free;
}
/* hoedown_buffer_new: allocation of a new buffer */
hoedown_buffer *
hoedown_buffer_new(size_t unit)
{
hoedown_buffer *ret = malloc(sizeof (hoedown_buffer));
hoedown_buffer_init(ret, unit, realloc, free, free);
return ret;
}
/* hoedown_buffer_free: decrease the reference count and free the buffer if needed */
void
hoedown_buffer_free(hoedown_buffer *buf)
{
if (!buf)
return;
buf->data_free(buf->data);
if (buf->buffer_free)
buf->buffer_free(buf);
}
/* hoedown_buffer_reset: frees internal data of the buffer */
void
hoedown_buffer_reset(hoedown_buffer *buf)
{
if (!buf)
return;
buf->data_free(buf->data);
buf->data = NULL;
buf->size = buf->asize = 0;
}
/* hoedown_buffer_grow: increasing the allocated size to the given value */
int
hoedown_buffer_grow(hoedown_buffer *buf, size_t neosz)
{
size_t neoasz;
void *neodata;
assert(buf && buf->unit);
if (buf->asize >= neosz)
return HOEDOWN_BUF_OK;
neoasz = buf->asize + buf->unit;
while (neoasz < neosz)
neoasz += buf->unit;
neodata = buf->data_realloc(buf->data, neoasz);
if (!neodata)
return HOEDOWN_BUF_ENOMEM;
buf->data = neodata;
buf->asize = neoasz;
return HOEDOWN_BUF_OK;
}
/* hoedown_buffer_put: appends raw data to a buffer */
void
hoedown_buffer_put(hoedown_buffer *buf, const void *data, size_t len)
{
assert(buf && buf->unit);
if (buf->size + len > buf->asize && hoedown_buffer_grow(buf, buf->size + len) < 0)
return;
memcpy(buf->data + buf->size, data, len);
buf->size += len;
}
/* hoedown_buffer_puts: appends a NUL-terminated string to a buffer */
void
hoedown_buffer_puts(hoedown_buffer *buf, const char *str)
{
hoedown_buffer_put(buf, str, strlen(str));
}
/* hoedown_buffer_putc: appends a single uint8_t to a buffer */
void
hoedown_buffer_putc(hoedown_buffer *buf, uint8_t c)
{
assert(buf && buf->unit);
if (buf->size + 1 > buf->asize && hoedown_buffer_grow(buf, buf->size + 1) < 0)
return;
buf->data[buf->size] = c;
buf->size += 1;
}
int
hoedown_buffer_prefix(const hoedown_buffer *buf, const char *prefix)
{
size_t i;
assert(buf && buf->unit);
for (i = 0; i < buf->size; ++i) {
if (prefix[i] == 0)
return 0;
if (buf->data[i] != prefix[i])
return buf->data[i] - prefix[i];
}
return 0;
}
/* hoedown_buffer_slurp: removes a given number of bytes from the head of the array */
void
hoedown_buffer_slurp(hoedown_buffer *buf, size_t len)
{
assert(buf && buf->unit);
if (len >= buf->size) {
buf->size = 0;
return;
}
buf->size -= len;
memmove(buf->data, buf->data + len, buf->size);
}
/* hoedown_buffer_cstr: NULL-termination of the string array */
const char *
hoedown_buffer_cstr(hoedown_buffer *buf)
{
assert(buf && buf->unit);
if (buf->size < buf->asize && buf->data[buf->size] == 0)
return (char *)buf->data;
if (buf->size + 1 <= buf->asize || hoedown_buffer_grow(buf, buf->size + 1) == 0) {
buf->data[buf->size] = 0;
return (char *)buf->data;
}
return NULL;
}
/* hoedown_buffer_printf: formatted printing to a buffer */
void
hoedown_buffer_printf(hoedown_buffer *buf, const char *fmt, ...)
{
va_list ap;
int n;
assert(buf && buf->unit);
if (buf->size >= buf->asize && hoedown_buffer_grow(buf, buf->size + 1) < 0)
return;
va_start(ap, fmt);
n = vsnprintf((char *)buf->data + buf->size, buf->asize - buf->size, fmt, ap);
va_end(ap);
if (n < 0) {
#ifndef _MSC_VER
return;
#else
va_start(ap, fmt);
n = _vscprintf(fmt, ap);
va_end(ap);
#endif
}
if ((size_t)n >= buf->asize - buf->size) {
if (hoedown_buffer_grow(buf, buf->size + n + 1) < 0)
return;
va_start(ap, fmt);
n = vsnprintf((char *)buf->data + buf->size, buf->asize - buf->size, fmt, ap);
va_end(ap);
}
if (n < 0)
return;
buf->size += n;
}
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