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- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <stdio.h>
- #include <errno.h>
- #include "libguile/_scm.h"
- #include "libguile/eval.h"
- #include "libguile/chars.h"
- #include "libguile/ports.h"
- #include "libguile/ports-internal.h"
- #include "libguile/fports.h"
- #include "libguile/root.h"
- #include "libguile/strings.h"
- #include "libguile/vectors.h"
- #include "libguile/validate.h"
- #include "libguile/vports.h"
- #ifdef HAVE_STRING_H
- #include <string.h>
- #endif
- static scm_t_bits scm_tc16_sfport;
- static void
- sf_flush (SCM port)
- {
- scm_t_port *pt = SCM_PTAB_ENTRY (port);
- SCM stream = SCM_PACK (pt->stream);
- SCM f = SCM_SIMPLE_VECTOR_REF (stream, 2);
- if (scm_is_true (f))
- scm_call_0 (f);
- }
- static void
- sf_write (SCM port, const void *data, size_t size)
- {
- SCM p = SCM_PACK (SCM_STREAM (port));
-
- scm_call_1 (SCM_SIMPLE_VECTOR_REF (p, 1),
- scm_from_locale_stringn ((char *) data, size));
- }
- static int
- sf_fill_input (SCM port)
- {
- SCM p = SCM_PACK (SCM_STREAM (port));
- SCM ans;
- scm_t_wchar c;
- scm_t_port_internal *pti;
- ans = scm_call_0 (SCM_SIMPLE_VECTOR_REF (p, 3));
- if (scm_is_false (ans) || SCM_EOF_OBJECT_P (ans))
- return EOF;
- SCM_ASSERT (SCM_CHARP (ans), ans, SCM_ARG1, "sf_fill_input");
- pti = SCM_PORT_GET_INTERNAL (port);
- c = SCM_CHAR (ans);
- if (pti->encoding_mode == SCM_PORT_ENCODING_MODE_LATIN1
- || (pti->encoding_mode == SCM_PORT_ENCODING_MODE_UTF8 && c < 0xff))
- {
- scm_t_port *pt = SCM_PTAB_ENTRY (port);
-
- *pt->read_buf = c;
- pt->read_pos = pt->read_buf;
- pt->read_end = pt->read_buf + 1;
- }
- else
- {
- long line = SCM_LINUM (port);
- int column = SCM_COL (port);
- scm_ungetc_unlocked (c, port);
- SCM_LINUM (port) = line;
- SCM_COL (port) = column;
- }
- return c;
- }
- static int
- sf_close (SCM port)
- {
- SCM p = SCM_PACK (SCM_STREAM (port));
- SCM f = SCM_SIMPLE_VECTOR_REF (p, 4);
- if (scm_is_false (f))
- return 0;
- f = scm_call_0 (f);
- errno = 0;
- return scm_is_false (f) ? EOF : 0;
- }
- static int
- sf_input_waiting (SCM port)
- {
- SCM p = SCM_PACK (SCM_STREAM (port));
- if (SCM_SIMPLE_VECTOR_LENGTH (p) >= 6)
- {
- SCM f = SCM_SIMPLE_VECTOR_REF (p, 5);
- if (scm_is_true (f))
- return scm_to_int (scm_call_0 (f));
- }
-
- return 1;
- }
- SCM_DEFINE (scm_make_soft_port, "make-soft-port", 2, 0, 0,
- (SCM pv, SCM modes),
- "Return a port capable of receiving or delivering characters as\n"
- "specified by the @var{modes} string (@pxref{File Ports,\n"
- "open-file}). @var{pv} must be a vector of length 5 or 6. Its\n"
- "components are as follows:\n"
- "\n"
- "@enumerate 0\n"
- "@item\n"
- "procedure accepting one character for output\n"
- "@item\n"
- "procedure accepting a string for output\n"
- "@item\n"
- "thunk for flushing output\n"
- "@item\n"
- "thunk for getting one character\n"
- "@item\n"
- "thunk for closing port (not by garbage collection)\n"
- "@item\n"
- "(if present and not @code{#f}) thunk for computing the number of\n"
- "characters that can be read from the port without blocking.\n"
- "@end enumerate\n"
- "\n"
- "For an output-only port only elements 0, 1, 2, and 4 need be\n"
- "procedures. For an input-only port only elements 3 and 4 need\n"
- "be procedures. Thunks 2 and 4 can instead be @code{#f} if\n"
- "there is no useful operation for them to perform.\n"
- "\n"
- "If thunk 3 returns @code{#f} or an @code{eof-object}\n"
- "(@pxref{Input, eof-object?, ,r5rs, The Revised^5 Report on\n"
- "Scheme}) it indicates that the port has reached end-of-file.\n"
- "For example:\n"
- "\n"
- "@lisp\n"
- "(define stdout (current-output-port))\n"
- "(define p (make-soft-port\n"
- " (vector\n"
- " (lambda (c) (write c stdout))\n"
- " (lambda (s) (display s stdout))\n"
- " (lambda () (display \".\" stdout))\n"
- " (lambda () (char-upcase (read-char)))\n"
- " (lambda () (display \"@@\" stdout)))\n"
- " \"rw\"))\n"
- "\n"
- "(write p p) @result{} #<input-output: soft 8081e20>\n"
- "@end lisp")
- #define FUNC_NAME s_scm_make_soft_port
- {
- int vlen;
- SCM z;
- SCM_VALIDATE_VECTOR (1, pv);
- vlen = SCM_SIMPLE_VECTOR_LENGTH (pv);
- SCM_ASSERT ((vlen == 5) || (vlen == 6), pv, 1, FUNC_NAME);
- SCM_VALIDATE_STRING (2, modes);
-
- z = scm_c_make_port (scm_tc16_sfport, scm_i_mode_bits (modes),
- SCM_UNPACK (pv));
- scm_port_non_buffer (SCM_PTAB_ENTRY (z));
- return z;
- }
- #undef FUNC_NAME
- static scm_t_bits
- scm_make_sfptob ()
- {
- scm_t_bits tc = scm_make_port_type ("soft", sf_fill_input, sf_write);
- scm_set_port_flush (tc, sf_flush);
- scm_set_port_close (tc, sf_close);
- scm_set_port_input_waiting (tc, sf_input_waiting);
- return tc;
- }
- void
- scm_init_vports ()
- {
- scm_tc16_sfport = scm_make_sfptob ();
- #include "libguile/vports.x"
- }
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