mirror of https://github.com/YosysHQ/yosys.git
136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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/**
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* POSIX.2008 fake implementation for pre-POSIX.2008 systems. (OSX, BSD, MINGW, CYGWIN, older Linux &c.)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#if !(_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L || defined(EMSCRIPTEN))
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typedef struct memstream {
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off_t pos;
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off_t size;
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char * buffer;
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char ** bufp;
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size_t * sizep;
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bool realloc;
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} memstream_t;
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static int memstream_read (void * cookie, char * buf, int size)
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{
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memstream_t * mem = (memstream_t *) cookie;
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off_t available = mem->size - mem->pos;
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if (available < 0)
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available = 0;
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if (size > available)
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size = available;
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memcpy(buf, mem->buffer + mem->pos, size);
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mem->pos += size;
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return size;
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}
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static int memstream_write (void * cookie, const char * buf, int size)
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{
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memstream_t * mem = (memstream_t *) cookie;
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off_t available = mem->size - mem->pos;
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if (size > available) {
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if (mem->realloc) {
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mem->buffer = (char *) realloc(mem->buffer, mem->pos + size + 1);
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memset(mem->buffer + mem->size, 0, mem->pos + size + 1 - mem->size);
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mem->size = mem->pos + size;
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if (mem->bufp)
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*(mem->bufp) = mem->buffer;
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if (mem->sizep)
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*(mem->sizep) = mem->size;
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} else {
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size = available;
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}
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}
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memcpy(mem->buffer + mem->pos, buf, sizeof(char) * size);
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mem->pos += size;
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return size;
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}
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static fpos_t memstream_seek (void * cookie, fpos_t offset, int whence)
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{
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memstream_t * mem = (memstream_t *) cookie;
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switch (whence) {
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case SEEK_SET:
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if (offset < 0)
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goto error_inval;
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mem->pos = offset;
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return 0;
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case SEEK_CUR:
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if (mem->pos + offset < 0)
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goto error_inval;
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mem->pos += offset;
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return 0;
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case SEEK_END:
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if (mem->size + offset < 0)
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goto error_inval;
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mem->pos = mem->size + offset;
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break;
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default:
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goto error_inval;
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}
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return mem->pos;
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error_inval:
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errno = EINVAL;
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return -1;
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}
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static int memstream_close (void * cookie)
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{
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memstream_t * mem = (memstream_t *) cookie;
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if (mem->bufp)
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*(mem->bufp) = mem->buffer;
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if (mem->sizep)
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*(mem->sizep) = mem->size;
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free(cookie);
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return 0;
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}
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FILE * compat_fmemopen (void * buf, size_t size, const char * mode)
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{
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memstream_t * mem = (memstream_t *) malloc(sizeof(memstream_t));
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memset(mem, 0, sizeof(memstream_t));
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mem->size = size;
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mem->buffer = (char *) buf;
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(void) mode;
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return funopen(mem, memstream_read, memstream_write, memstream_seek, memstream_close);
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}
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FILE * compat_open_memstream (char ** bufp, size_t * sizep)
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{
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memstream_t * mem = (memstream_t *) malloc(sizeof(memstream_t));
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memset(mem, 0, sizeof(memstream_t));
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mem->bufp = bufp;
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mem->sizep = sizep;
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mem->realloc = true;
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return funopen(mem, memstream_read, memstream_write, memstream_seek, memstream_close);
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}
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#endif /* !(_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L) */
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