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75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/**
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* Cyclone Scheme
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* https://github.com/justinethier/cyclone
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*
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* Copyright (c) 2014-2016, Justin Ethier
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* All rights reserved.
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*
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* This file contains platform-specific code for memory streams.
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*/
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#include "cyclone/types.h"
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#include "cyclone/runtime.h"
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#include <errno.h>
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//#include <limits.h>
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//#include <ctype.h>
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/* These macros are hardcoded here to support functions in this module. */
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#define closcall1(td, clo, a1) \
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if (type_is_pair_prim(clo)) { \
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Cyc_apply(td, 0, (closure)(a1), clo); \
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} else { \
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((clo)->fn)(td, 1, clo, a1);\
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}
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#define return_closcall1(td, clo, a1) { \
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char top; \
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if (stack_overflow(&top, (((gc_thread_data *)data)->stack_limit))) { \
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object buf[1]; buf[0] = a1;\
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GC(td, clo, buf, 1); \
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return; \
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} else {\
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closcall1(td, (closure) (clo), a1); \
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return;\
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} \
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}
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object Cyc_heap_alloc_port(void *data);
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port_type *Cyc_io_open_output_string(void *data)
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{
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// Allocate port on the heap so the location of mem_buf does not change
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// make_port(p, NULL, 0);
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port_type *p = (port_type *)Cyc_heap_alloc_port(data);
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p->hdr.mark = ((gc_thread_data *)data)->gc_alloc_color;
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p->hdr.grayed = 0;
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p->tag = port_tag;
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p->fp = NULL;
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p->mode = 0; // Output
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p->mem_buf = NULL;
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p->mem_buf_len = 0;
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errno = 0;
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#if CYC_HAVE_OPEN_MEMSTREAM
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p->fp = open_memstream(&(p->mem_buf), &(p->mem_buf_len));
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#endif
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if (p->fp == NULL){
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Cyc_rt_raise2(data, "Unable to open memory stream", obj_int2obj(errno));
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}
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return p;
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}
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void Cyc_io_get_output_string(void *data, object cont, object port)
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{
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port_type *p;
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Cyc_check_port(data, port);
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if (((port_type *)port)->mem_buf == NULL) {
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Cyc_rt_raise2(data, "Not an in-memory port", port);
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}
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p = (port_type *)port;
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if (p->fp) {
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fflush(p->fp);
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}
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{
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make_string_with_len(s, p->mem_buf, p->mem_buf_len);
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return_closcall1(data, cont, &s);
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}
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}
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