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view interps/bfjoust/buffer.h @ 8635:0ce4cdb31cce
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author | HackBot |
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date | Tue, 28 Jun 2016 16:29:45 +0000 |
parents | 859f9b4339e6 |
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/* * Copyright (C) 2009 Gregor Richards * * 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. */ #ifndef BUFFER_H #define BUFFER_H #include "helpers.h" #define BUFFER_DEFAULT_SIZE 1024 /* auto-expanding buffer */ #define BUFFER(name, type) \ struct Buffer_ ## name { \ size_t bufsz, bufused; \ type *buf; \ } BUFFER(char, char); BUFFER(int, int); /* initialize a buffer */ #define INIT_BUFFER(buffer) \ { \ (buffer).bufsz = BUFFER_DEFAULT_SIZE; \ (buffer).bufused = 0; \ SF((buffer).buf, malloc, NULL, (BUFFER_DEFAULT_SIZE * sizeof(*(buffer).buf))); \ } /* free a buffer */ #define FREE_BUFFER(buffer) \ { \ if ((buffer).buf) free((buffer).buf); \ (buffer).buf = NULL; \ } /* the address of the free space in the buffer */ #define BUFFER_END(buffer) ((buffer).buf + (buffer).bufused) /* mark new bytes in a buffer */ #define STEP_BUFFER(buffer, by) ((buffer).bufused += by) /* the amount of space left in the buffer */ #define BUFFER_SPACE(buffer) ((buffer).bufsz - (buffer).bufused) /* expand a buffer */ #define EXPAND_BUFFER(buffer) \ { \ (buffer).bufsz *= 2; \ SF((buffer).buf, realloc, NULL, ((buffer).buf, (buffer).bufsz * sizeof(*(buffer).buf))); \ } /* write a string to a buffer */ #define WRITE_BUFFER(buffer, string, len) \ { \ size_t _len = (len); \ while (BUFFER_SPACE(buffer) < _len) { \ EXPAND_BUFFER(buffer); \ } \ memcpy(BUFFER_END(buffer), string, _len * sizeof(*(buffer).buf)); \ STEP_BUFFER(buffer, _len); \ } /* read a file into a buffer */ #define READ_FILE_BUFFER(buffer, fh) \ { \ size_t _rd; \ while ((_rd = fread(BUFFER_END(buffer), 1, BUFFER_SPACE(buffer), (fh))) > 0) { \ STEP_BUFFER(buffer, _rd); \ if (BUFFER_SPACE(buffer) <= 0) { \ EXPAND_BUFFER(buffer); \ } \ } \ } #endif