117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
/* buffer.c
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*
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* Copyright (C) 2010-2011 Henrik Hautakoski <henrik@fiktivkod.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "error.h"
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#include "buffer.h"
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#define CHNK_SIZE 128
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unsigned char buffer_null = '\0';
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void buffer_init(struct buffer *b) {
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b->block = &buffer_null;
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b->size = b->len = 0;
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}
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void buffer_expand(struct buffer *b, size_t len) {
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if (b->len + len < b->size)
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return;
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if (!b->size)
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b->block = NULL;
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do
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b->size += CHNK_SIZE;
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while(b->len + len > b->size);
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b->block = realloc(b->block, b->size);
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}
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char* buffer_cstr(struct buffer *b) {
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buffer_expand(b, 1);
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b->block[b->len] = '\0';
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return (char*) b->block;
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}
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char* buffer_cstr_release(struct buffer *b) {
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char *ret;
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if (b->size) {
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if (b->len + 1 != b->size) {
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ret = realloc(b->block, b->len + 1);
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} else {
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ret = (char *) b->block;
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}
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ret[b->len] = '\0';
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} else {
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ret = calloc(1, 1);
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}
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buffer_init(b);
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return ret;
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}
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void buffer_free(struct buffer *b) {
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if (!b->size)
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return;
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free(b->block);
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buffer_init(b);
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}
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void buffer_attach(struct buffer *b, void *ptr, size_t len, size_t size) {
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buffer_free(b);
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b->block = ptr;
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b->len = len;
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b->size = size;
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buffer_expand(b, 0);
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}
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void buffer_append(struct buffer *b, const void *ptr, size_t len) {
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buffer_expand(b, len);
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memcpy(b->block + b->len, ptr, len);
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buffer_setlen(b, b->len + len);
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}
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int buffer_write(struct buffer *b, const char *filename) {
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int fd, rc;
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fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0664);
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if (fd < 0)
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return warn("%s: %s", filename, strerror(errno));
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rc = write(fd, b->block, b->len);
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close(fd);
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return rc;
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}
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