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/*
* Copyright (c) 2008, Natacha Porté
* Copyright (c) 2015, Vicent Marti
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#define BUFFER_MAX_ALLOC_SIZE (1024 * 1024 * 16) //16mb
#define __USE_MINGW_ANSI_STDIO 1
#include "buffer.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
/* MSVC compat */
#if defined(_MSC_VER)
# define _buf_vsnprintf _vsnprintf
#else
# define _buf_vsnprintf vsnprintf
#endif
int
bufprefix(const struct buf *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;
}
/* bufgrow: increasing the allocated size to the given value */
int
bufgrow(struct buf *buf, size_t neosz)
{
size_t neoasz;
void *neodata;
assert(buf && buf->unit);
if (neosz > BUFFER_MAX_ALLOC_SIZE)
return BUF_ENOMEM;
if (buf->asize >= neosz)
return BUF_OK;
neoasz = buf->asize + buf->unit;
while (neoasz < neosz)
neoasz += buf->unit;
neodata = realloc(buf->data, neoasz);
if (!neodata)
return BUF_ENOMEM;
buf->data = neodata;
buf->asize = neoasz;
return BUF_OK;
}
/* bufnew: allocation of a new buffer */
struct buf *
bufnew(size_t unit)
{
struct buf *ret;
ret = malloc(sizeof (struct buf));
if (ret) {
ret->data = 0;
ret->size = ret->asize = 0;
ret->unit = unit;
}
return ret;
}
/* bufnullterm: NULL-termination of the string array */
const char *
bufcstr(const struct buf *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 || bufgrow(buf, buf->size + 1) == BUF_OK) {
buf->data[buf->size] = 0;
return (char *)buf->data;
}
return NULL;
}
/* bufprintf: formatted printing to a buffer */
void
bufprintf(struct buf *buf, const char *fmt, ...)
{
va_list ap;
int n;
assert(buf && buf->unit);
if (buf->size >= buf->asize && bufgrow(buf, buf->size + 1) < BUF_OK)
return;
va_start(ap, fmt);
n = _buf_vsnprintf((char *)buf->data + buf->size, buf->asize - buf->size, fmt, ap);
va_end(ap);
if (n < 0) {
#ifdef _MSC_VER
va_start(ap, fmt);
n = _vscprintf(fmt, ap);
va_end(ap);
#else
return;
#endif
}
if ((size_t)n >= buf->asize - buf->size) {
if (bufgrow(buf, buf->size + n + 1) < BUF_OK)
return;
va_start(ap, fmt);
n = _buf_vsnprintf((char *)buf->data + buf->size, buf->asize - buf->size, fmt, ap);
va_end(ap);
}
if (n < 0)
return;
buf->size += n;
}
/* bufput: appends raw data to a buffer */
void
bufput(struct buf *buf, const void *data, size_t len)
{
assert(buf && buf->unit);
if (buf->size + len > buf->asize && bufgrow(buf, buf->size + len) < BUF_OK)
return;
memcpy(buf->data + buf->size, data, len);
buf->size += len;
}
/* bufputs: appends a NUL-terminated string to a buffer */
void
bufputs(struct buf *buf, const char *str)
{
bufput(buf, str, strlen(str));
}
/* bufputc: appends a single uint8_t to a buffer */
void
bufputc(struct buf *buf, int c)
{
assert(buf && buf->unit);
if (buf->size + 1 > buf->asize && bufgrow(buf, buf->size + 1) < BUF_OK)
return;
buf->data[buf->size] = c;
buf->size += 1;
}
/* bufrelease: decrease the reference count and free the buffer if needed */
void
bufrelease(struct buf *buf)
{
if (!buf)
return;
free(buf->data);
free(buf);
}
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