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/* strbuf - String buffer routines
*
* Copyright (c) 2010-2012 Mark Pulford <mark@kyne.com.au>
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <stdint.h>
#include "strbuf.h"
static void die(const char *fmt, ...)
{
va_list arg;
va_start(arg, fmt);
vfprintf(stderr, fmt, arg);
va_end(arg);
fprintf(stderr, "\n");
abort();
}
void strbuf_init(strbuf_t *s, size_t len)
{
size_t size;
if (!len)
size = STRBUF_DEFAULT_SIZE;
else
size = len + 1;
if (size < len)
die("Overflow, len: %zu", len);
s->buf = NULL;
s->size = size;
s->length = 0;
s->dynamic = 0;
s->reallocs = 0;
s->debug = 0;
s->buf = malloc(size);
if (!s->buf)
die("Out of memory");
strbuf_ensure_null(s);
}
strbuf_t *strbuf_new(size_t len)
{
strbuf_t *s;
s = malloc(sizeof(strbuf_t));
if (!s)
die("Out of memory");
strbuf_init(s, len);
/* Dynamic strbuf allocation / deallocation */
s->dynamic = 1;
return s;
}
static inline void debug_stats(strbuf_t *s)
{
if (s->debug) {
fprintf(stderr, "strbuf(%lx) reallocs: %d, length: %zd, size: %zd\n",
(long)s, s->reallocs, s->length, s->size);
}
}
/* If strbuf_t has not been dynamically allocated, strbuf_free() can
* be called any number of times strbuf_init() */
void strbuf_free(strbuf_t *s)
{
debug_stats(s);
if (s->buf) {
free(s->buf);
s->buf = NULL;
}
if (s->dynamic)
free(s);
}
char *strbuf_free_to_string(strbuf_t *s, size_t *len)
{
char *buf;
debug_stats(s);
strbuf_ensure_null(s);
buf = s->buf;
if (len)
*len = s->length;
if (s->dynamic)
free(s);
return buf;
}
static size_t calculate_new_size(strbuf_t *s, size_t len)
{
size_t reqsize, newsize;
if (len <= 0)
die("BUG: Invalid strbuf length requested");
/* Ensure there is room for optional NULL termination */
reqsize = len + 1;
if (reqsize < len)
die("Overflow, len: %zu", len);
/* If the user has requested to shrink the buffer, do it exactly */
if (s->size > reqsize)
return reqsize;
newsize = s->size;
if (reqsize >= SIZE_MAX / 2) {
newsize = reqsize;
} else {
/* Exponential sizing */
while (newsize < reqsize)
newsize *= 2;
}
if (newsize < reqsize)
die("BUG: strbuf length would overflow, len: %zu", len);
return newsize;
}
/* Ensure strbuf can handle a string length bytes long (ignoring NULL
* optional termination). */
void strbuf_resize(strbuf_t *s, size_t len)
{
size_t newsize;
newsize = calculate_new_size(s, len);
if (s->debug > 1) {
fprintf(stderr, "strbuf(%lx) resize: %zd => %zd\n",
(long)s, s->size, newsize);
}
s->size = newsize;
s->buf = realloc(s->buf, s->size);
if (!s->buf)
die("Out of memory, len: %zu", len);
s->reallocs++;
}
void strbuf_append_string(strbuf_t *s, const char *str)
{
int i;
size_t space;
space = strbuf_empty_length(s);
for (i = 0; str[i]; i++) {
if (space < 1) {
strbuf_resize(s, s->length + 1);
space = strbuf_empty_length(s);
}
s->buf[s->length] = str[i];
s->length++;
space--;
}
}
/* vi:ai et sw=4 ts=4:
*/
|
