mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-06-29 22:40:34 +02:00
1999-07-13 Gary Houston <ghouston@easynet.co.uk>
* strports.c (scm_strprint_obj): simplify. start with initial buffer size of 0. (st_seek): don't allow string to be extended if seeking past the end of a read-only port. 1999-07-12 Gary Houston <ghouston@easynet.co.uk> * strports.c (st_seek): change the resize checks. * ports.c (scm_ftruncate): throw error if offset works out negative. * strports.c (st_flush): increase string size in blocks of SCM_WRITE_BLOCK instead of 1. set read_end to read_pos if it's greater and reset read_buf_size. (scm_mkstrport): set rw_randow if only writing, since read_buf needs to be maintained for output ports too (it holds the written part of the string, while write_buf may have unwritten buffer chars.) (st_truncate): rewritten. (top of file): added a few notes. 1999-07-06 Gary Houston <ghouston@easynet.co.uk> * strports.c (st_grow_port): set pt->read_pos. set pt->read_buf_size one less than pt->write_buf_size if there's an unwritten char at the end of the string. similarly for pt->read_end. (st_resize_port): renamed from st_grow_port. (st_seek): simplify by assuming that pt->write_pos == pt->read_pos. seek from read_end instead of write_end for SEEK_END. (st_ftruncate): calculate current length using readbuf, not write buf. (scm_strport_to_string): use read_buf_size for length. (stfill_buffer): don't re-initialise the readbuf. 1999-07-05 Gary Houston <ghouston@easynet.co.uk> * strports.c (scm_strport_to_string): new procedure. (scm_call_with_output_string, scm_strprint_obj): use scm_strport_to_string. used SCM_INUM0 instead of SCM_MAKINUM (0) in a few places.
This commit is contained in:
Gary Houston
parent
4dc7f07fde
commit
3fe6190f46
5 changed files with 142 additions and 56 deletions
1
THANKS
1
THANKS
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@ -24,6 +24,7 @@ Bug reports and fixes from:
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David Lutterkort
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Christian Lynbech
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Russ McManus
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Eric Moore
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Nicolas Neuss
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Thien-Thi Nguyen
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Richard Polton
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@ -1,3 +1,47 @@
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1999-07-13 Gary Houston <ghouston@easynet.co.uk>
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* strports.c (scm_strprint_obj): simplify. start with initial
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buffer size of 0.
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(st_seek): don't allow string to be extended if seeking past
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the end of a read-only port.
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1999-07-12 Gary Houston <ghouston@easynet.co.uk>
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* strports.c (st_seek): change the resize checks.
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* ports.c (scm_ftruncate): throw error if offset works out negative.
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* strports.c (st_flush): increase string size in blocks of
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SCM_WRITE_BLOCK instead of 1. set read_end to read_pos if
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it's greater and reset read_buf_size.
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(scm_mkstrport): set rw_randow if only writing, since read_buf needs
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to be maintained for output ports too (it holds the written
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part of the string, while write_buf may have unwritten buffer
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chars.)
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(st_truncate): rewritten.
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(top of file): added a few notes.
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1999-07-06 Gary Houston <ghouston@easynet.co.uk>
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* strports.c (st_grow_port): set pt->read_pos. set
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pt->read_buf_size one less than pt->write_buf_size if there's
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an unwritten char at the end of the string. similarly for
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pt->read_end.
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(st_resize_port): renamed from st_grow_port.
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(st_seek): simplify by assuming that pt->write_pos == pt->read_pos.
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seek from read_end instead of write_end for SEEK_END.
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(st_ftruncate): calculate current length using readbuf, not write
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buf.
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(scm_strport_to_string): use read_buf_size for length.
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(stfill_buffer): don't re-initialise the readbuf.
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1999-07-05 Gary Houston <ghouston@easynet.co.uk>
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* strports.c (scm_strport_to_string): new procedure.
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(scm_call_with_output_string, scm_strprint_obj): use
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scm_strport_to_string.
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used SCM_INUM0 instead of SCM_MAKINUM (0) in a few places.
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1999-07-08 Mikael Djurfeldt <mdj@mdj-pc.nada.kth.se>
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* symbols.c (scm_gensym): Bugfix. (Thanks to Johannes Hjorth.)
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@ -421,7 +465,6 @@ Fri Jun 25 22:14:32 1999 Greg Badros <gjb@cs.washington.edu>
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* strports.c (scm_call_with_output_string): get size from
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buffer instead of port stream.
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(scm_strprint_obj): likewise.
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(st_flush): new proc.
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* ports.h (struct scm_port_table): added write_end member,
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@ -1022,7 +1022,15 @@ scm_ftruncate (SCM port, SCM length)
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else if (pt->rw_active == SCM_PORT_WRITE)
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ptob->fflush (port);
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ptob->ftruncate (port, scm_num2long (length, (char *)SCM_ARG2, s_ftruncate));
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{
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off_t c_length = scm_num2long (length, (char *)SCM_ARG2, s_ftruncate);
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if (c_length < 0)
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scm_misc_error (s_ftruncate, "negative offset",
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scm_cons (length, SCM_EOL));
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ptob->ftruncate (port, c_length);
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}
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return SCM_UNSPECIFIED;
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}
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@ -58,6 +58,13 @@
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*
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*/
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/* NOTES:
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write_buf/write_end point to the ends of the allocated string.
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read_buf/read_end in principle point to the part of the string which
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has been written to, but this is only updated after a flush.
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read_pos and write_pos in principle should be equal, but this is only true
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when rw_active is 0.
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*/
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static int
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prinstpt (SCM exp, SCM port, scm_print_state *pstate)
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@ -69,37 +76,39 @@ prinstpt (SCM exp, SCM port, scm_print_state *pstate)
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static int
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stfill_buffer (SCM port)
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{
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SCM str = SCM_STREAM (port);
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scm_port *pt = SCM_PTAB_ENTRY (port);
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pt->read_buf = SCM_ROCHARS (str);
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pt->read_buf_size = SCM_ROLENGTH (str);
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pt->read_end = pt->read_buf + pt->read_buf_size;
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if (pt->read_pos >= pt->read_end)
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return EOF;
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else
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return scm_return_first (*(pt->read_pos++), port);
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}
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/* change the size of a port's string to new_size. this doesn't
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change read_buf_size. */
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static void
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st_grow_port (scm_port *pt, off_t add)
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st_resize_port (scm_port *pt, off_t new_size)
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{
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off_t new_size = pt->write_buf_size + add;
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off_t index = pt->write_pos - pt->write_buf;
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pt->write_buf_size = new_size;
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scm_vector_set_length_x (pt->stream, SCM_MAKINUM (new_size));
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scm_vector_set_length_x (pt->stream,
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SCM_MAKINUM (new_size));
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pt->read_buf_size = pt->write_buf_size = new_size;
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/* reset buffer in case reallocation moved the string. */
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{
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off_t index = pt->write_pos - pt->write_buf;
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pt->read_buf = pt->write_buf = SCM_CHARS (pt->stream);
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pt->write_pos = pt->write_buf + index;
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pt->read_end = pt->write_end = pt->write_buf + pt->write_buf_size;
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pt->read_pos = pt->write_pos = pt->write_buf + index;
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pt->write_end = pt->write_buf + pt->write_buf_size;
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pt->read_end = pt->read_buf + pt->read_buf_size;
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}
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}
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/* amount by which write_buf is expanded. */
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#define SCM_WRITE_BLOCK 80
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/* ensure that write_pos < write_end by enlarging the buffer when
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necessary. update read_buf to account for written chars. */
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static void
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st_flush (SCM port)
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{
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@ -107,9 +116,14 @@ st_flush (SCM port)
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if (pt->write_pos == pt->write_end)
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{
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st_grow_port (pt, 1);
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st_resize_port (pt, pt->write_buf_size + SCM_WRITE_BLOCK);
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}
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pt->read_pos = pt->write_pos;
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if (pt->read_pos > pt->read_end)
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{
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pt->read_end = (unsigned char *) pt->read_pos;
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pt->read_buf_size = pt->read_end - pt->read_buf;
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}
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pt->rw_active = 0;
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}
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@ -128,29 +142,44 @@ st_seek (SCM port, off_t offset, int whence)
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scm_port *pt = SCM_PTAB_ENTRY (port);
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off_t target;
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/* we can assume at this point that pt->write_pos == pt->read_pos. */
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switch (whence)
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{
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case SEEK_CUR:
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if (SCM_CAR (port) & SCM_WRTNG)
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target = pt->write_pos - pt->write_buf + offset;
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else
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target = pt->read_pos - pt->read_buf + offset;
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target = pt->read_pos - pt->read_buf + offset;
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break;
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case SEEK_END:
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target = pt->write_end - pt->write_buf + offset;
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target = pt->read_end - pt->read_buf + offset;
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break;
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default: /* SEEK_SET */
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target = offset;
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break;
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}
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if (target < 0)
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scm_misc_error ("st_seek", "negative offset",
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scm_cons (SCM_MAKINUM (target), EOF));
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if (target > pt->read_buf_size)
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scm_misc_error ("st_seek", "negative offset", SCM_EOL);
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if (target >= pt->write_buf_size)
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{
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st_grow_port (pt, target - pt->read_buf_size);
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if (!(SCM_CAR (port) & SCM_WRTNG))
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{
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if (target > pt->write_buf_size)
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{
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scm_misc_error ("st_seek", "seek past end of read-only strport",
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SCM_EOL);
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}
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}
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else
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{
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st_resize_port (pt, target + (target == pt->write_buf_size
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? SCM_WRITE_BLOCK
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: 0));
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}
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}
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pt->read_pos = pt->write_pos = pt->read_buf + target;
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if (pt->read_pos > pt->read_end)
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{
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pt->read_end = (unsigned char *) pt->read_pos;
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pt->read_buf_size = pt->read_end - pt->read_buf;
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}
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return target;
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}
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@ -158,10 +187,17 @@ static void
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st_ftruncate (SCM port, off_t length)
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{
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scm_port *pt = SCM_PTAB_ENTRY (port);
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off_t old_len = pt->write_end - pt->write_buf;
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if (length > pt->write_buf_size)
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st_resize_port (pt, length);
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pt->read_buf_size = length;
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pt->read_end = pt->read_buf + length;
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if (pt->read_pos > pt->read_end)
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pt->read_pos = pt->read_end;
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if (length != old_len)
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st_grow_port (pt, length - old_len);
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if (pt->write_pos > pt->read_end)
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pt->write_pos = pt->read_end;
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}
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SCM
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@ -192,13 +228,30 @@ scm_mkstrport (pos, str, modes, caller)
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pt->read_pos = pt->write_pos = pt->read_buf + SCM_INUM (pos);
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pt->write_buf_size = pt->read_buf_size = str_len;
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pt->write_end = pt->read_end = pt->read_buf + pt->read_buf_size;
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pt->rw_random = (modes & SCM_RDNG) && (modes & SCM_WRTNG);
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/* doesn't check (modes & SCM_RDNG), since the read_buf must be
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maintained even for output-only ports. */
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pt->rw_random = modes & SCM_WRTNG;
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SCM_ALLOW_INTS;
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/* ensure write_pos is writable. */
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if ((modes & SCM_WRTNG) && pt->write_pos == pt->write_end)
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st_flush (z);
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return z;
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}
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/* create a new string from a string port's buffer. */
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SCM scm_strport_to_string (SCM port)
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{
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scm_port *pt = SCM_PTAB_ENTRY (port);
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if (pt->rw_active == SCM_PORT_WRITE)
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st_flush (port);
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return scm_makfromstr (SCM_CHARS (SCM_STREAM (port)),
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pt->read_buf_size, 0);
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}
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SCM_PROC(s_call_with_output_string, "call-with-output-string", 1, 0, 0, scm_call_with_output_string);
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SCM
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@ -212,22 +265,8 @@ scm_call_with_output_string (proc)
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SCM_OPN | SCM_WRTNG,
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s_call_with_output_string);
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scm_apply (proc, p, scm_listofnull);
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{
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SCM answer;
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/* can't use pt->write_pos, in case port position was changed with
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seek.
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The port buffer protocol promises that you can always store at
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least one character at write_pos. This means that the
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underlying string always has one spare character at the end,
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that the user didn't write. Make sure we don't include that in
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the result. */
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answer = scm_makfromstr (SCM_CHARS (SCM_STREAM (p)),
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SCM_LENGTH (SCM_STREAM (p)) - 1,
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0);
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return answer;
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}
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return scm_strport_to_string (p);
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}
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@ -243,17 +282,11 @@ scm_strprint_obj (obj)
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SCM str;
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SCM port;
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str = scm_makstr (64, 0);
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port = scm_mkstrport (SCM_MAKINUM (0), str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj");
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str = scm_makstr (0, 0);
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port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_WRTNG, "scm_strprint_obj");
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scm_prin1 (obj, port, 1);
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{
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scm_port *pt = SCM_PTAB_ENTRY (port);
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SCM answer;
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answer = scm_makfromstr (SCM_CHARS (SCM_STREAM (port)),
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pt->write_pos - pt->write_buf,
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0);
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return answer;
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return scm_strport_to_string (port);
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}
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}
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@ -279,7 +312,7 @@ SCM
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scm_read_0str (expr)
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char *expr;
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{
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SCM port = scm_mkstrport (SCM_MAKINUM (0),
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SCM port = scm_mkstrport (SCM_INUM0,
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scm_makfrom0str (expr),
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SCM_OPN | SCM_RDNG,
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"scm_eval_0str");
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@ -308,7 +341,7 @@ SCM
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scm_eval_string (string)
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SCM string;
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{
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SCM port = scm_mkstrport (SCM_MAKINUM (0), string, SCM_OPN | SCM_RDNG,
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SCM port = scm_mkstrport (SCM_INUM0, string, SCM_OPN | SCM_RDNG,
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"scm_eval_0str");
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SCM form;
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SCM ans = SCM_UNSPECIFIED;
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@ -51,6 +51,7 @@ extern scm_ptobfuns scm_stptob;
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extern SCM scm_mkstrport SCM_P ((SCM pos, SCM str, long modes, const char * caller));
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extern SCM scm_strport_to_string (SCM port);
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extern SCM scm_call_with_output_string SCM_P ((SCM proc));
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extern SCM scm_strprint_obj SCM_P ((SCM obj));
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extern SCM scm_call_with_input_string SCM_P ((SCM str, SCM proc));
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