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128 lines
3.6 KiB
128 lines
3.6 KiB
/*
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* Functions for manipulating variable sized memory buffers.
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* These buffers can grow and shrink as the program progresses.
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*
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* Written by Eric R. Smith
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* Copyright (c) 2012 Total Spectrum Software Inc.
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* MIT Licensed; see terms at the end of this file.
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*/
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#include "flexbuf.h"
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#include <stdlib.h>
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#include <stdio.h>
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#define DEFAULT_GROWSIZE BUFSIZ
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void flexbuf_init(struct flexbuf *fb, size_t growsize)
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{
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fb->data = NULL;
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fb->len = 0;
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fb->space = 0;
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fb->growsize = growsize ? growsize : DEFAULT_GROWSIZE;
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}
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size_t flexbuf_curlen(struct flexbuf *fb)
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{
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return fb->len;
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}
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/* add a single character to a buffer */
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char *flexbuf_addchar(struct flexbuf *fb, int c)
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{
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size_t newlen = fb->len + 1;
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if (newlen > fb->space) {
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char *newdata;
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newdata = (char *)realloc(fb->data, fb->space + fb->growsize);
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if (!newdata) return newdata;
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fb->space += fb->growsize;
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fb->data = newdata;
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}
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fb->data[fb->len] = (char)c;
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fb->len = newlen;
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return fb->data;
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}
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/* add N characters to a buffer */
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char *flexbuf_addmem(struct flexbuf *fb, const char *buf, size_t N)
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{
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size_t newlen = fb->len + N;
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if (newlen > fb->space) {
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char *newdata;
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size_t newspace;
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newspace = fb->space + fb->growsize;
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if (newspace < newlen) {
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newspace = newlen + fb->growsize;
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}
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newdata = (char *)realloc(fb->data, newspace);
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if (!newdata) return newdata;
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fb->space = newspace;
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fb->data = newdata;
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}
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memcpy(fb->data + fb->len, buf, N);
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fb->len = newlen;
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return fb->data;
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}
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/* add a string to a buffer */
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char *flexbuf_addstr(struct flexbuf *fb, const char *str)
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{
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return flexbuf_addmem(fb, str, strlen(str));
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}
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/* retrieve the pointer for a flexbuf */
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/* "peek" gets it but keeps it reserved;
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* "get" gets it and releases it from the flexbuf
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*/
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char *flexbuf_peek(struct flexbuf *fb)
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{
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char *r = fb->data;
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return r;
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}
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char *flexbuf_get(struct flexbuf *fb)
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{
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char *r = fb->data;
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flexbuf_init(fb, fb->growsize);
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return r;
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}
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/* reset the buffer to empty (but do not free space) */
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void flexbuf_clear(struct flexbuf *fb)
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{
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fb->len = 0;
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}
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/* free the memory associated with a buffer */
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void flexbuf_delete(struct flexbuf *fb)
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{
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if (fb->data)
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free(fb->data);
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flexbuf_init(fb, 1);
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}
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/*
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* +--------------------------------------------------------------------
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* ¦ TERMS OF USE: MIT License
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* +--------------------------------------------------------------------
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* +--------------------------------------------------------------------
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*/
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