home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1989, 2000 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- distributor accepts any responsibility for the consequences of using it, or
- for whether it serves any particular purpose or works at all, unless he or
- she says so in writing. Refer to the Aladdin Free Public License (the
- "License") for full details.
-
- Every copy of AFPL Ghostscript must include a copy of the License, normally
- in a plain ASCII text file named PUBLIC. The License grants you the right
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: zfile.c,v 1.5.2.1 2000/11/02 15:05:08 igorm Exp $ */
- /* Non-I/O file operators */
- #include "memory_.h"
- #include "string_.h"
- #include "ghost.h"
- #include "gscdefs.h" /* for gx_io_device_table */
- #include "gp.h"
- #include "gsfname.h"
- #include "gsstruct.h" /* for registering root */
- #include "gxalloc.h" /* for streams */
- #include "oper.h"
- #include "estack.h" /* for filenameforall, .execfile */
- #include "ialloc.h"
- #include "ilevel.h" /* %names only work in Level 2 */
- #include "interp.h" /* gs_errorinfo_put_string prototype */
- #include "isave.h" /* for restore */
- #include "iutil.h"
- #include "stream.h"
- #include "strimpl.h"
- #include "sfilter.h"
- #include "gxiodev.h" /* must come after stream.h */
- /* and before files.h */
- #include "files.h"
- #include "main.h" /* for gs_lib_paths */
- #include "store.h"
-
- /* Import the IODevice table. */
- extern_gx_io_device_table();
-
- /* Import the dtype of the stdio IODevices. */
- extern const char iodev_dtype_stdio[];
-
- /* Forward references: file name parsing. */
- private int parse_file_name(P2(const ref * op, gs_parsed_file_name_t * pfn));
- private int parse_real_file_name(P4(const ref * op,
- gs_parsed_file_name_t * pfn,
- gs_memory_t *mem, client_name_t cname));
-
- /* Forward references: other. */
- private int zopen_file(P4(const gs_parsed_file_name_t *pfn,
- const char *file_access, stream **ps,
- gs_memory_t *mem));
- private iodev_proc_open_file(iodev_os_open_file);
- private int execfile_finish(P1(i_ctx_t *));
- private int execfile_cleanup(P1(i_ctx_t *));
-
- /*
- * Since there can be many file objects referring to the same file/stream,
- * we can't simply free a stream when we close it. On the other hand,
- * we don't want freed streams to clutter up memory needlessly.
- * Our solution is to retain the freed streams, and reuse them.
- * To prevent an old file object from being able to access a reused stream,
- * we keep a serial number in each stream, and check it against a serial
- * number stored in the file object (as the "size"); when we close a file,
- * we increment its serial number. If the serial number ever overflows,
- * we leave it at zero, and do not reuse the stream.
- * (This will never happen.)
- *
- * Storage management for this scheme is a little tricky. We maintain an
- * invariant that says that a stream opened at a given save level always
- * uses a stream structure allocated at that level. By doing this, we don't
- * need to keep track separately of streams open at a level vs. streams
- * allocated at a level. To make this interact properly with save and
- * restore, we maintain a list of all streams allocated at this level, both
- * open and closed. We store this list in the allocator: this is a hack,
- * but it simplifies bookkeeping (in particular, it guarantees the list is
- * restored properly by a restore).
- *
- * We want to close streams freed by restore and by garbage collection. We
- * use the finalization procedure for this. For restore, we don't have to
- * do anything special to make this happen. For garbage collection, we do
- * something more drastic: we simply clear the list of known streams (at all
- * save levels). Any streams open at the time of garbage collection will no
- * longer participate in the list of known streams, but this does no harm;
- * it simply means that they won't get reused, and can only be reclaimed by
- * a future garbage collection or restore.
- */
-
- /*
- * Define the default stream buffer sizes. For file streams,
- * this is arbitrary, since the C library or operating system
- * does its own buffering in addition.
- * However, the buffer size for eexec decoding is NOT arbitrary:
- * it must be at most 512.
- */
- #define DEFAULT_BUFFER_SIZE 512
- const uint file_default_buffer_size = DEFAULT_BUFFER_SIZE;
-
- /* An invalid file object */
- private stream invalid_file_stream;
- stream *const invalid_file_entry = &invalid_file_stream;
-
- /* Initialize the file table */
- private int
- zfile_init(i_ctx_t *i_ctx_p)
- {
- /* Create and initialize an invalid (closed) stream. */
- /* Initialize the stream for the sake of the GC, */
- /* and so it can act as an empty input stream. */
-
- stream *const s = &invalid_file_stream;
-
- s_init(s, NULL);
- sread_string(s, NULL, 0);
- s->next = s->prev = 0;
- s_init_no_id(s);
- return 0;
- }
-
- /* Make an invalid file object. */
- void
- make_invalid_file(ref * fp)
- {
- make_file(fp, avm_invalid_file_entry, ~0, invalid_file_entry);
- }
-
- /* <name_string> <access_string> file <file> */
- private int
- zfile(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- char file_access[3];
- gs_parsed_file_name_t pname;
- const byte *astr;
- int code;
- stream *s;
-
- check_read_type(*op, t_string);
- astr = op->value.const_bytes;
- switch (r_size(op)) {
- case 2:
- if (astr[1] != '+')
- return_error(e_invalidfileaccess);
- file_access[1] = '+';
- file_access[2] = 0;
- break;
- case 1:
- file_access[1] = 0;
- break;
- default:
- return_error(e_invalidfileaccess);
- }
- switch (astr[0]) {
- case 'r':
- case 'w':
- case 'a':
- break;
- default:
- return_error(e_invalidfileaccess);
- }
- file_access[0] = astr[0];
- code = parse_file_name(op - 1, &pname);
- if (code < 0)
- return code;
- /*
- * HACK: temporarily patch the current context pointer into the
- * state pointer for stdio-related devices. See ziodev.c for
- * more information.
- */
- if (pname.iodev && pname.iodev->dtype == iodev_dtype_stdio) {
- if (pname.fname)
- return_error(e_invalidfileaccess);
- pname.iodev->state = i_ctx_p;
- code = (*pname.iodev->procs.open_device)(pname.iodev,
- file_access, &s, imemory);
- pname.iodev->state = NULL;
- } else {
- if (pname.iodev == NULL)
- pname.iodev = iodev_default;
- code = zopen_file(&pname, file_access, &s, imemory);
- }
- if (code < 0)
- return code;
- code = ssetfilename(s, op[-1].value.const_bytes, r_size(op - 1));
- if (code < 0) {
- sclose(s);
- return_error(e_VMerror);
- }
- make_stream_file(op - 1, s, file_access);
- pop(1);
- return code;
- }
-
- /* ------ Level 2 extensions ------ */
-
- /* <string> deletefile - */
- private int
- zdeletefile(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- gs_parsed_file_name_t pname;
- int code = parse_real_file_name(op, &pname, imemory, "deletefile");
-
- if (code < 0)
- return code;
- code = (*pname.iodev->procs.delete_file)(pname.iodev, pname.fname);
- gs_free_file_name(&pname, "deletefile");
- if (code < 0)
- return code;
- pop(1);
- return 0;
- }
-
- /* <template> <proc> <scratch> filenameforall - */
- /****** NOT CONVERTED FOR IODEVICES YET ******/
- private int file_continue(P1(i_ctx_t *));
- private int file_cleanup(P1(i_ctx_t *));
- private int
- zfilenameforall(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- file_enum *pfen;
- int code;
-
- check_write_type(*op, t_string);
- check_proc(op[-1]);
- check_read_type(op[-2], t_string);
- /* Push a mark, the pattern, the scratch string, the enumerator, */
- /* and the procedure, and invoke the continuation. */
- check_estack(7);
- pfen = gp_enumerate_files_init((char *)op[-2].value.bytes, r_size(op - 2), imemory);
- if (pfen == 0)
- return_error(e_VMerror);
- push_mark_estack(es_for, file_cleanup);
- *++esp = op[-2];
- *++esp = *op;
- ++esp;
- make_istruct(esp, 0, pfen);
- *++esp = op[-1];
- pop(3);
- code = file_continue(i_ctx_p);
- return (code == o_pop_estack ? o_push_estack : code);
- }
- /* Continuation operator for enumerating files */
- private int
- file_continue(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- es_ptr pscratch = esp - 2;
- file_enum *pfen = r_ptr(esp - 1, file_enum);
- uint len = r_size(pscratch);
- uint code =
- gp_enumerate_files_next(pfen, (char *)pscratch->value.bytes, len);
-
- if (code == ~(uint) 0) { /* all done */
- esp -= 4; /* pop proc, pfen, scratch, mark */
- return o_pop_estack;
- } else if (code > len) /* overran string */
- return_error(e_rangecheck);
- else {
- push(1);
- ref_assign(op, pscratch);
- r_set_size(op, code);
- push_op_estack(file_continue); /* come again */
- *++esp = pscratch[2]; /* proc */
- return o_push_estack;
- }
- }
- /* Cleanup procedure for enumerating files */
- private int
- file_cleanup(i_ctx_t *i_ctx_p)
- {
- gp_enumerate_files_close(r_ptr(esp + 4, file_enum));
- return 0;
- }
-
- /* <string1> <string2> renamefile - */
- private int
- zrenamefile(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- gs_parsed_file_name_t pname1, pname2;
- int code = parse_real_file_name(op - 1, &pname1, imemory,
- "renamefile(from)");
-
- if (code < 0)
- return code;
- pname2.fname = 0;
- code = parse_real_file_name(op, &pname2, imemory, "renamefile(to)");
- if (code < 0 || pname1.iodev != pname2.iodev ||
- (code = (*pname1.iodev->procs.rename_file)(pname1.iodev,
- pname1.fname, pname2.fname)) < 0
- ) {
- if (code >= 0)
- code = gs_note_error(e_invalidfileaccess);
- }
- gs_free_file_name(&pname2, "renamefile(to)");
- gs_free_file_name(&pname1, "renamefile(from)");
- if (code < 0)
- return code;
- pop(2);
- return 0;
- }
-
- /* <file> status <open_bool> */
- /* <string> status <pages> <bytes> <ref_time> <creation_time> true */
- /* <string> status false */
- private int
- zstatus(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
-
- switch (r_type(op)) {
- case t_file:
- {
- stream *s;
-
- make_bool(op, (file_is_valid(s, op) ? 1 : 0));
- }
- return 0;
- case t_string:
- {
- gs_parsed_file_name_t pname;
- struct stat fstat;
- int code = parse_file_name(op, &pname);
-
- if (code < 0)
- return code;
- code = gs_terminate_file_name(&pname, imemory, "status");
- if (code < 0)
- return code;
- code = (*pname.iodev->procs.file_status)(pname.iodev,
- pname.fname, &fstat);
- switch (code) {
- case 0:
- check_ostack(4);
- /*
- * Check to make sure that the file size fits into
- * a PostScript integer. (On some systems, long is
- * 32 bits, but file sizes are 64 bits.)
- */
- push(4);
- make_int(op - 4, stat_blocks(&fstat));
- make_int(op - 3, fstat.st_size);
- /*
- * We can't check the value simply by using ==,
- * because signed/unsigned == does the wrong thing.
- * Instead, since integer assignment only keeps the
- * bottom bits, we convert the values to double
- * and then test for equality. This handles all
- * cases of signed/unsigned or width mismatch.
- */
- if ((double)op[-4].value.intval !=
- (double)stat_blocks(&fstat) ||
- (double)op[-3].value.intval !=
- (double)fstat.st_size
- )
- return_error(e_limitcheck);
- make_int(op - 2, fstat.st_mtime);
- make_int(op - 1, fstat.st_ctime);
- make_bool(op, 1);
- break;
- case e_undefinedfilename:
- make_bool(op, 0);
- code = 0;
- }
- gs_free_file_name(&pname, "status");
- return code;
- }
- default:
- return_op_typecheck(op);
- }
- }
-
- /* ------ Non-standard extensions ------ */
-
- /* <executable_file> .execfile - */
- private int
- zexecfile(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
-
- check_type_access(*op, t_file, a_executable | a_read | a_execute);
- check_estack(4); /* cleanup, file, finish, file */
- push_mark_estack(es_other, execfile_cleanup);
- *++esp = *op;
- push_op_estack(execfile_finish);
- return zexec(i_ctx_p);
- }
- /* Finish normally. */
- private int
- execfile_finish(i_ctx_t *i_ctx_p)
- {
- check_ostack(1);
- esp -= 2;
- execfile_cleanup(i_ctx_p);
- return o_pop_estack;
- }
- /* Clean up by closing the file. */
- private int
- execfile_cleanup(i_ctx_t *i_ctx_p)
- {
- check_ostack(1);
- *++osp = esp[2];
- return zclosefile(i_ctx_p);
- }
-
- /* <dir> <name> .filenamedirseparator <string> */
- private int
- zfilenamedirseparator(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- const char *sepr;
-
- check_read_type(*op, t_string);
- check_read_type(op[-1], t_string);
- sepr =
- gp_file_name_concat_string((const char *)op[-1].value.const_bytes,
- r_size(op - 1),
- (const char *)op->value.const_bytes,
- r_size(op));
- make_const_string(op - 1, avm_foreign | a_readonly,
- strlen(sepr), (const byte *)sepr);
- pop(1);
- return 0;
- }
-
- /* - .filenamelistseparator <string> */
- private int
- zfilenamelistseparator(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
-
- push(1);
- make_const_string(op, avm_foreign | a_readonly, 1,
- (const byte *)&gp_file_name_list_separator);
- return 0;
- }
-
- /* <name> .filenamesplit <dir> <base> <extension> */
- private int
- zfilenamesplit(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
-
- check_read_type(*op, t_string);
- /****** NOT IMPLEMENTED YET ******/
- return_error(e_undefined);
- }
-
- /* <string> .libfile <file> true */
- /* <string> .libfile <string> false */
- private int
- zlibfile(i_ctx_t *i_ctx_p)
- {
- os_ptr op = osp;
- int code;
- #define MAX_CNAME 200
- byte cname[MAX_CNAME];
- uint clen;
- gs_parsed_file_name_t pname;
- stream *s;
-
- check_ostack(2);
- code = parse_file_name(op, &pname);
- if (code < 0)
- return code;
- if (pname.iodev == NULL)
- pname.iodev = iodev_default;
- if (pname.iodev != iodev_default) { /* Non-OS devices don't have search paths (yet). */
- code = zopen_file(&pname, "r", &s, imemory);
- if (code >= 0) {
- code = ssetfilename(s, op->value.const_bytes, r_size(op));
- if (code < 0) {
- sclose(s);
- return_error(e_VMerror);
- }
- }
- if (code < 0) {
- push(1);
- make_false(op);
- return 0;
- }
- make_stream_file(op, s, "r");
- } else {
- ref fref;
-
- code = lib_file_open(pname.fname, pname.len, cname, MAX_CNAME,
- &clen, &fref, imemory);
- if (code >= 0) {
- s = fptr(&fref);
- code = ssetfilename(s, cname, clen);
- if (code < 0) {
- sclose(s);
- return_error(e_VMerror);
- }
- }
- if (code < 0) {
- if (code == e_VMerror)
- return code;
- push(1);
- make_false(op);
- return 0;
- }
- ref_assign(op, &fref);
- }
- push(1);
- make_true(op);
- return 0;
- }
-
- /* ------ Initialization procedure ------ */
-
- const op_def zfile_op_defs[] =
- {
- {"1deletefile", zdeletefile},
- {"1.execfile", zexecfile},
- {"2file", zfile},
- {"3filenameforall", zfilenameforall},
- {"2.filenamedirseparator", zfilenamedirseparator},
- {"0.filenamelistseparator", zfilenamelistseparator},
- {"1.filenamesplit", zfilenamesplit},
- {"1.libfile", zlibfile},
- {"2renamefile", zrenamefile},
- {"1status", zstatus},
- /* Internal operators */
- {"0%file_continue", file_continue},
- {"0%execfile_finish", execfile_finish},
- op_def_end(zfile_init)
- };
-
- /* ------ File name parsing ------ */
-
- /* Parse a file name into device and individual name. */
- /* See gsfname.c for details. */
- private int
- parse_file_name(const ref * op, gs_parsed_file_name_t * pfn)
- {
- check_read_type(*op, t_string);
- return gs_parse_file_name(pfn, (const char *)op->value.const_bytes,
- r_size(op));
- }
-
- /* Parse a real (non-device) file name and convert to a C string. */
- /* See gsfname.c for details. */
- private int
- parse_real_file_name(const ref *op, gs_parsed_file_name_t *pfn,
- gs_memory_t *mem, client_name_t cname)
- {
- check_read_type(*op, t_string);
- return gs_parse_real_file_name(pfn, (const char *)op->value.const_bytes,
- r_size(op), mem, cname);
- }
-
- /* ------ Stream opening ------ */
-
- /*
- * Open a file specified by a parsed file name (which may be only a
- * device).
- */
- private int
- zopen_file(const gs_parsed_file_name_t *pfn, const char *file_access,
- stream **ps, gs_memory_t *mem)
- {
- gx_io_device *const iodev = pfn->iodev;
-
- if (pfn->fname == NULL) /* just a device */
- return iodev->procs.open_device(iodev, file_access, ps, mem);
- else { /* file */
- iodev_proc_open_file((*open_file)) = iodev->procs.open_file;
-
- if (open_file == 0)
- open_file = iodev_os_open_file;
- return open_file(iodev, pfn->fname, pfn->len, file_access, ps, mem);
- }
- }
-
- /*
- * Define the file_open procedure for the %os% IODevice (also used, as the
- * default, for %pipe% and possibly others).
- */
- private int
- iodev_os_open_file(gx_io_device * iodev, const char *fname, uint len,
- const char *file_access, stream ** ps, gs_memory_t * mem)
- {
- return file_open_stream(fname, len, file_access,
- file_default_buffer_size, ps,
- iodev->procs.fopen, mem);
- }
-
- /* Make a t_file reference to a stream. */
- void
- make_stream_file(ref * pfile, stream * s, const char *access)
- {
- uint attrs =
- (access[1] == '+' ? a_write + a_read + a_execute : 0) |
- imemory_space((gs_ref_memory_t *) s->memory);
-
- if (access[0] == 'r') {
- make_file(pfile, attrs | (a_read | a_execute), s->read_id, s);
- s->write_id = 0;
- } else {
- make_file(pfile, attrs | a_write, s->write_id, s);
- s->read_id = 0;
- }
- }
-
- /* Open an OS-level file (like fopen), using the search paths if necessary. */
- /* Note that it does not automatically look in the current */
- /* directory first (or at all): this is like Unix, and unlike MS-DOS. */
- private int
- lib_file_fopen(gx_io_device * iodev, const char *bname,
- const char *ignore_access, FILE ** pfile,
- char *rfname, uint rnamelen)
- {
- char fmode[3]; /* r, [b], null */
- int len = strlen(bname);
- const gs_file_path *pfpath = &gs_lib_path;
- uint pi;
-
- strcpy(fmode, "r");
- strcat(fmode, gp_fmode_binary_suffix);
- if (gp_file_name_is_absolute(bname, len))
- return (*iodev->procs.fopen)(iodev, bname, fmode, pfile,
- rfname, rnamelen);
- /* Go through the list of search paths */
- for (pi = 0; pi < r_size(&pfpath->list); ++pi) {
- const ref *prdir = pfpath->list.value.refs + pi;
- const char *pstr = (const char *)prdir->value.const_bytes;
- uint plen = r_size(prdir);
- const char *cstr =
- gp_file_name_concat_string(pstr, plen, bname, len);
- int up, i;
- int code;
-
- /* Concatenate the prefix, combiner, and file name. */
- /* Do this carefully in case rfname is the same */
- /* as fname. (We don't worry about the case */
- /* where rfname only overlaps fname.) */
- up = plen + strlen(cstr);
- if (up + len + 1 > rnamelen)
- return_error(e_limitcheck);
- for (i = len + 1; --i >= 0;)
- rfname[i + up] = bname[i];
- memcpy(rfname, pstr, plen);
- memcpy(rfname + plen, cstr, strlen(cstr));
- code = (*iodev->procs.fopen)(iodev, rfname, fmode,
- pfile, rfname, rnamelen);
- if (code >= 0)
- return code;
- /* strcpy isn't guaranteed to work for overlapping */
- /* source and destination, so: */
- if (rfname == bname)
- for (i = 0; (rfname[i] = rfname[i + up]) != 0; i++);
- }
- return_error(e_undefinedfilename);
- }
- /* The startup code calls this to open @-files. */
- FILE *
- lib_fopen(const char *bname)
- {
- FILE *file = NULL;
- /* We need a buffer to hold the expanded file name. */
- char buffer[gp_file_name_sizeof];
- /* We can't count on the IODevice table to have been initialized yet. */
- /* Allocate a copy of the default IODevice. */
- gx_io_device iodev_default_copy;
- int code;
-
- iodev_default_copy = *gx_io_device_table[0];
- code = lib_file_fopen(&iodev_default_copy, bname, "r", &file,
- buffer, gp_file_name_sizeof);
- return (code < 0 ? NULL : file);
- }
-
- /* Open a file stream on an OS file and create a file object, */
- /* using the search paths. */
- /* The startup code calls this to open the initialization file gs_init.ps. */
- int
- lib_file_open(const char *fname, uint len, byte * cname, uint max_clen,
- uint * pclen, ref * pfile, gs_memory_t *mem)
- {
- stream *s;
- int code = file_open_stream(fname, len, "r", file_default_buffer_size,
- &s, lib_file_fopen, mem);
- char *bname;
- uint blen;
-
- if (code < 0)
- return code;
- /* Get the name from the stream buffer. */
- bname = (char *)s->cbuf;
- blen = strlen(bname);
- if (blen > max_clen) {
- sclose(s);
- return_error(e_limitcheck);
- }
- memcpy(cname, bname, blen);
- *pclen = blen;
- make_stream_file(pfile, s, "r");
- return 0;
- }
-
- /* Open a file stream that reads a string. */
- /* (This is currently used only by the ccinit feature.) */
- /* The string must be allocated in non-garbage-collectable (foreign) space. */
- int
- file_read_string(const byte *str, uint len, ref *pfile, gs_ref_memory_t *imem)
- {
- stream *s = file_alloc_stream((gs_memory_t *)imem, "file_read_string");
-
- if (s == 0)
- return_error(e_VMerror);
- sread_string(s, str, len);
- s->foreign = 1;
- s->write_id = 0;
- make_file(pfile, a_readonly | imemory_space(imem), s->read_id, s);
- s->save_close = s->procs.close;
- s->procs.close = file_close_disable;
- return 0;
- }
-
- /* Open a file stream, optionally on an OS file. */
- /* Return 0 if successful, error code if not. */
- /* On a successful return, the C file name is in the stream buffer. */
- /* If fname==0, set up the file entry, stream, and buffer, */
- /* but don't open an OS file or initialize the stream. */
- int
- file_open_stream(const char *fname, uint len, const char *file_access,
- uint buffer_size, stream ** ps, iodev_proc_fopen_t fopen_proc,
- gs_memory_t *mem)
- {
- byte *buffer;
- register stream *s;
-
- if (buffer_size == 0)
- buffer_size = file_default_buffer_size;
- if (len >= buffer_size) /* we copy the file name into the buffer */
- return_error(e_limitcheck);
- /* Allocate the stream first, since it persists */
- /* even after the file has been closed. */
- s = file_alloc_stream(mem, "file_open_stream");
- if (s == 0)
- return_error(e_VMerror);
- /* Allocate the buffer. */
- buffer = gs_alloc_bytes(mem, buffer_size, "file_open_stream(buffer)");
- if (buffer == 0)
- return_error(e_VMerror);
- if (fname != 0) {
- /* Copy the name (so we can terminate it with a zero byte.) */
- char *file_name = (char *)buffer;
- char fmode[4]; /* r/w/a, [+], [b], null */
- FILE *file;
- int code;
-
- memcpy(file_name, fname, len);
- file_name[len] = 0; /* terminate string */
- /* Open the file, always in binary mode. */
- strcpy(fmode, file_access);
- strcat(fmode, gp_fmode_binary_suffix);
- /****** iodev_default IS QUESTIONABLE ******/
- code = (*fopen_proc)(iodev_default, file_name, fmode, &file,
- (char *)buffer, buffer_size);
- if (code < 0) {
- gs_free_object(mem, buffer, "file_open_stream(buffer)");
- return code;
- }
- /* Set up the stream. */
- switch (fmode[0]) {
- case 'a':
- sappend_file(s, file, buffer, buffer_size);
- break;
- case 'r':
- /* Defeat buffering for terminals. */
- {
- struct stat rstat;
-
- fstat(fileno(file), &rstat);
- sread_file(s, file, buffer,
- (S_ISCHR(rstat.st_mode) ? 1 : buffer_size));
- }
- break;
- case 'w':
- swrite_file(s, file, buffer, buffer_size);
- }
- if (fmode[1] == '+')
- s->file_modes |= s_mode_read | s_mode_write;
- s->save_close = s->procs.close;
- s->procs.close = file_close_file;
- } else { /* save the buffer and size */
- s->cbuf = buffer;
- s->bsize = s->cbsize = buffer_size;
- }
- *ps = s;
- return 0;
- }
-
- /* Report an error by storing it in the stream's error_string. */
- int
- filter_report_error(stream_state * st, const char *str)
- {
- if_debug1('s', "[s]stream error: %s\n", str);
- strncpy(st->error_string, str, STREAM_MAX_ERROR_STRING);
- /* Ensure null termination. */
- st->error_string[STREAM_MAX_ERROR_STRING] = 0;
- return 0;
- }
-
- /* Open a file stream for a filter. */
- int
- filter_open(const char *file_access, uint buffer_size, ref * pfile,
- const stream_procs * procs, const stream_template * template,
- const stream_state * st, gs_memory_t *mem)
- {
- stream *s;
- uint ssize = gs_struct_type_size(template->stype);
- stream_state *sst = 0;
- int code;
-
- if (template->stype != &st_stream_state) {
- sst = s_alloc_state(mem, template->stype, "filter_open(stream_state)");
- if (sst == 0)
- return_error(e_VMerror);
- }
- code = file_open_stream((char *)0, 0, file_access,
- buffer_size, &s, (iodev_proc_fopen_t)0, mem);
- if (code < 0) {
- gs_free_object(mem, sst, "filter_open(stream_state)");
- return code;
- }
- s_std_init(s, s->cbuf, s->bsize, procs,
- (*file_access == 'r' ? s_mode_read : s_mode_write));
- s->procs.process = template->process;
- s->save_close = s->procs.close;
- s->procs.close = file_close_file;
- if (sst == 0) {
- /* This stream doesn't have any state of its own. */
- /* Hack: use the stream itself as the state. */
- sst = (stream_state *) s;
- } else if (st != 0) /* might not have client parameters */
- memcpy(sst, st, ssize);
- s->state = sst;
- s_init_state(sst, template, mem);
- sst->report_error = filter_report_error;
-
- if (template->init != 0) {
- code = (*template->init)(sst);
- if (code < 0) {
- gs_free_object(mem, sst, "filter_open(stream_state)");
- gs_free_object(mem, s->cbuf, "filter_open(buffer)");
- return code;
- }
- }
- make_stream_file(pfile, s, file_access);
- return 0;
- }
-
- /* Allocate and return a file stream. */
- /* Return 0 if the allocation failed. */
- /* The stream is initialized to an invalid state, so the caller need not */
- /* worry about cleaning up if a later step in opening the stream fails. */
- stream *
- file_alloc_stream(gs_memory_t * mem, client_name_t cname)
- {
- stream *s;
- gs_ref_memory_t *imem = 0;
-
- /*
- * HACK: Figure out whether this is a gs_ref_memory_t.
- * Avoiding this hack would require rippling a change
- * from gs_memory_t to gs_ref_memory_t into the open_file and
- * open_device procedures of gx_io_device, which in turn would
- * impact other things we don't want to change.
- */
- if (mem->procs.free_object == gs_ref_memory_procs.free_object)
- imem = (gs_ref_memory_t *) mem;
-
- if (imem) {
- /* Look first for a free stream allocated at this level. */
- s = imem->streams;
- while (s != 0) {
- if (!s_is_valid(s) && s->read_id != 0 /* i.e. !overflowed */ ) {
- s->is_temp = 0; /* not a temp stream */
- return s;
- }
- s = s->next;
- }
- }
- s = s_alloc(mem, cname);
- if (s == 0)
- return 0;
- s_init_ids(s);
- s->is_temp = 0; /* not a temp stream */
- /*
- * Disable the stream now (in case we can't open the file,
- * or a filter init procedure fails) so that `restore' won't
- * crash when it tries to close open files.
- */
- s_disable(s);
- if (imem) {
- /* Add s to the list of files. */
- if (imem->streams != 0)
- imem->streams->prev = s;
- s->next = imem->streams;
- imem->streams = s;
- } else {
- s->next = 0;
- }
- s->prev = 0;
- return s;
- }
-
- /* ------ Stream closing ------ */
-
- /*
- * Finish closing a file stream. This used to check whether it was
- * currentfile, but we don't have to do this any longer. This replaces the
- * close procedure for the std* streams, which cannot actually be closed.
- *
- * This is exported for ziodev.c. */
- int
- file_close_finish(stream * s)
- {
- return 0;
- }
-
- /*
- * Close a file stream, but don't deallocate the buffer. This replaces the
- * close procedure for %lineedit and %statementedit. (This is WRONG: these
- * streams should allocate a new buffer each time they are opened, but that
- * would overstress the allocator right now.) This is exported for ziodev.c.
- * This also replaces the close procedure for the string-reading stream
- * created for gs_run_string.
- */
- int
- file_close_disable(stream * s)
- {
- int code = (*s->save_close)(s);
-
- if (code)
- return code;
- /* Increment the IDs to prevent further access. */
- s->read_id = s->write_id = (s->read_id | s->write_id) + 1;
- return file_close_finish(s);
- }
-
- /* Close a file stream. This replaces the close procedure in the stream */
- /* for normal (OS) files and for filters. */
- int
- file_close_file(stream * s)
- {
- stream *stemp = s->strm;
- gs_memory_t *mem;
- int code = file_close_disable(s);
-
- if (code)
- return code;
- /*
- * Check for temporary streams created for filters.
- * There may be more than one in the case of a procedure-based filter,
- * or if we created an intermediate stream to ensure
- * a large enough buffer. Note that these streams may have been
- * allocated by file_alloc_stream, so we mustn't free them.
- */
- while (stemp != 0 && stemp->is_temp != 0) {
- stream *snext = stemp->strm;
-
- mem = stemp->memory;
- if (stemp->is_temp > 1)
- gs_free_object(mem, stemp->cbuf,
- "file_close(temp stream buffer)");
- s_disable(stemp);
- stemp = snext;
- }
- mem = s->memory;
- gs_free_object(mem, s->cbuf, "file_close(buffer)");
- if (s->close_strm && stemp != 0)
- return sclose(stemp);
- return 0;
- }
-
- /* Close a file object. */
- /* This is exported only for gsmain.c. */
- int
- file_close(ref * pfile)
- {
- stream *s;
-
- if (file_is_valid(s, pfile)) { /* closing a closed file is a no-op */
- if (sclose(s))
- return_error(e_ioerror);
- }
- return 0;
- }
-