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- /* Copyright (C) 1989, 1992, 1993 Aladdin Enterprises. All rights reserved.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* zfileio.c */
- /* File I/O operators for Ghostscript */
- #include "ghost.h"
- #include "gp.h"
- #include "errors.h"
- #include "oper.h"
- #include "stream.h"
- #include "estack.h"
- #include "files.h"
- #include "iscan.h"
- #include "store.h"
- #include "gsmatrix.h" /* for gxdevice.h */
- #include "gxdevice.h"
- #include "gxdevmem.h"
-
- /* Forward references */
- int zreadline_from(P4(byte *, uint, uint *, stream *));
- private es_ptr zget_current_file(P0());
- private int write_string(P2(os_ptr, stream *));
-
- /* ------ Operators ------ */
-
- /* <file> read <int> true */
- /* <file> read false */
- int
- zread(register os_ptr op)
- { stream *s;
- int ch;
- check_read_file(s, op);
- ch = sgetc(s);
- if ( ch >= 0 )
- { make_int(op, ch);
- push(1);
- make_bool(op, 1);
- }
- else if ( ch == EOFC )
- make_bool(op, 0);
- else
- return_error(e_ioerror);
- return 0;
- }
-
- /* <file> <int> write - */
- int
- zwrite(register os_ptr op)
- { stream *s;
- ulong ch;
- check_write_file(s, op - 1);
- check_type(*op, t_integer);
- ch = op->value.intval;
- if ( ch > 0xff )
- return_error(e_rangecheck);
- sputc(s, (byte)ch);
- pop(2);
- return 0;
- }
-
- /* <file> <string> readhexstring <substring> <filled_bool> */
- int
- zreadhexstring(register os_ptr op)
- { stream *s;
- int code;
- uint nread;
- int odd = -1;
- check_read_file(s, op - 1);
- check_write_type(*op, t_string);
- code = sreadhex(s, op->value.bytes, r_size(op), &nread, &odd, 1);
- switch ( code )
- {
- case EOFC:
- /* Reached end-of-file before filling the string. */
- /* Return an appropriate substring. */
- r_set_size(op, nread);
- code = 1;
- break;
- case 0:
- /* Filled the string. */
- break;
- default: /* Error */
- return_error(e_ioerror);
- }
- ref_assign(op - 1, op);
- make_bool(op, 1 - code);
- return 0;
- }
-
- /* <file> <string> writehexstring - */
- int
- zwritehexstring(register os_ptr op)
- { register stream *s;
- register byte ch;
- register const byte *p;
- register const char _ds *hex_digits = "0123456789abcdef";
- register uint len;
- check_write_file(s, op - 1);
- check_read_type(*op, t_string);
- p = op->value.bytes;
- len = r_size(op);
- while ( len-- )
- { ch = *p++;
- sputc(s, hex_digits[ch >> 4]);
- sputc(s, hex_digits[ch & 0xf]);
- }
- pop(2);
- return 0;
- }
-
- /* <file> <string> readstring <substring> <filled_bool> */
- int
- zreadstring(register os_ptr op)
- { stream *s;
- uint len, rlen;
- check_read_file(s, op - 1);
- check_write_type(*op, t_string);
- len = r_size(op);
- rlen = sgets(s, op->value.bytes, len);
- r_set_size(op, rlen);
- op[-1] = *op;
- make_bool(op, (rlen == len ? 1 : 0));
- return 0;
- }
-
- /* <file> <string> writestring - */
- int
- zwritestring(register os_ptr op)
- { stream *s;
- int code;
- check_write_file(s, op - 1);
- code = write_string(op, s);
- if ( code >= 0 ) pop(2);
- return code;
- }
-
- /* <file> <string> readline <substring> <bool> */
- int
- zreadline(register os_ptr op)
- { stream *s;
- uint count;
- int code;
- check_read_file(s, op - 1);
- check_write_type(*op, t_string);
- code = zreadline_from(op->value.bytes, r_size(op), &count, s);
- if ( code < 0 ) return code;
- r_set_size(op, count);
- op[-1] = *op;
- make_bool(op, code);
- return 0;
- }
-
- /* Internal readline routine. */
- /* Returns 1 if OK, 0 if end of file, or an error code. */
- int
- zreadline_from(byte *ptr, uint size, uint *pcount, stream *s)
- { uint count = 0;
- int ch;
- for ( ; ; count++ )
- {
- /* Most systems define \n as 0xa and \r as 0xd; however, */
- /* OS-9 has \n == \r == 0xd and \l == 0xa. The following */
- /* code works properly regardless of environment. */
-
- switch ( ch = sgetc(s) )
- {
- case '\r':
- #if '\n' == '\r' /* OS-9 or similar */
- # define LF 0xa
- if ( s != gs_stream_stdin )
- { ch = sgetc(s);
- if ( ch != LF && ch >= 0 )
- sputback(s);
- }
- /* falls through */
- case LF:
- # undef LF
- #else /* '\n' != '\r' */
- ch = sgetc(s);
- if ( ch != '\n' && ch >= 0 ) sputback(s);
- /* falls through */
- case '\n':
- #endif
- *pcount = count;
- return 1;
- case EOFC:
- *pcount = count;
- return 0;
- }
- if ( count >= size ) /* filled the string */
- { sputback(s);
- return_error(e_rangecheck);
- }
- *ptr++ = ch;
- }
- /*return 0;*/ /* not reached */
- }
-
- /* token - this is called from zstring.c */
- int
- ztoken_file(register os_ptr op)
- { stream *s;
- int code;
- check_read_file(s, op);
- switch ( code = scan_token(s, 0, (ref *)op) )
- {
- default: /* possible error */
- if ( code < 0 ) return code;
- /* read a token */
- push(1);
- make_true(op);
- return 0;
- case scan_EOF: /* no tokens */
- make_false(op);
- return 0;
- }
- }
-
- /* <file> bytesavailable <int> */
- int
- zbytesavailable(register os_ptr op)
- { stream *s;
- long avail;
- check_read_file(s, op);
- if ( savailable(s, &avail) < 0 )
- return_error(e_ioerror);
- make_int(op, avail);
- return 0;
- }
-
- /* - flush - */
- int
- zflush(register os_ptr op)
- { sflush(gs_stream_stdout);
- return 0;
- }
-
- /* <file> flushfile - */
- int
- zflushfile(register os_ptr op)
- { stream *s;
- check_file(s, op);
- sflush(s);
- pop(1);
- return 0;
- }
-
- /* <file> resetfile - */
- int
- zresetfile(register os_ptr op)
- { NYI("resetfile");
- pop(1);
- return 0;
- }
-
- /* - currentfile <file> */
- int
- zcurrentfile(register os_ptr op)
- { es_ptr fp;
- push(1);
- /* Check the cache first */
- if ( esfile != 0 )
- ref_assign(op, esfile);
- else if ( (fp = zget_current_file()) == 0 )
- { /* Return an invalid file object. */
- /* This doesn't make a lot of sense to me, */
- /* but it's what the PostScript manual specifies. */
- make_file(op, 0, ~0, invalid_file_entry);
- }
- else
- { ref_assign(op, fp);
- /* Load the cache */
- esfile = fp;
- }
- /* Make the returned value literal. */
- r_clear_attrs(op, a_executable);
- return 0;
- }
-
- /* <string> print - */
- int
- zprint(register os_ptr op)
- { int code = write_string(op, gs_stream_stdout);
- if ( code >= 0 ) pop(1);
- return code;
- }
-
- /* <bool> echo - */
- int
- zecho(register os_ptr op)
- { check_type(*op, t_boolean);
- /****** NOT IMPLEMENTED YET ******/
- pop(1);
- return 0;
- }
-
- /* ------ Level 2 extensions ------ */
-
- /* <file> fileposition <int> */
- int
- zfileposition(register os_ptr op)
- { stream *s;
- check_file(s, op);
- if ( !sseekable(s) )
- return_error(e_ioerror);
- make_int(op, stell(s));
- return 0;
- }
-
- /* <file> <int> setfileposition - */
- int
- zsetfileposition(register os_ptr op)
- { stream *s;
- check_file(s, op - 1);
- check_type(*op, t_integer);
- if ( sseek(s, op->value.intval) < 0 )
- return_error(e_ioerror);
- pop(2);
- return 0;
- }
-
- /* ------ Ghostscript extensions ------ */
-
- /* <file> <int> unread - */
- int
- zunread(register os_ptr op)
- { stream *s;
- ulong ch;
- check_read_file(s, op - 1);
- check_type(*op, t_integer);
- ch = op->value.intval;
- if ( ch > 0xff )
- return_error(e_rangecheck);
- if ( sungetc(s, (byte)ch) < 0 )
- return_error(e_ioerror);
- pop(2);
- return 0;
- }
-
- /* <file> <device> writeppmfile - */
- int
- zwriteppmfile(register os_ptr op)
- { stream *s;
- int code;
- check_write_file(s, op - 1);
- check_type(*op, t_device);
- if ( !gs_device_is_memory(op->value.pdevice) )
- return_error(e_typecheck);
- sflush(s);
- code = gs_writeppmfile((gx_device_memory *)(op->value.pdevice), s->file);
- if ( code >= 0 ) pop(2);
- return code;
- }
-
- /* ------ Initialization procedure ------ */
-
- op_def zfileio_op_defs[] = {
- {"1bytesavailable", zbytesavailable},
- {"0currentfile", zcurrentfile},
- {"1echo", zecho},
- {"1fileposition", zfileposition},
- {"0flush", zflush},
- {"1flushfile", zflushfile},
- {"1print", zprint},
- {"1read", zread},
- {"2readhexstring", zreadhexstring},
- {"2readline", zreadline},
- {"2readstring", zreadstring},
- {"1resetfile", zresetfile},
- {"2setfileposition", zsetfileposition},
- {"2unread", zunread},
- {"2write", zwrite},
- {"2writehexstring", zwritehexstring},
- {"2writeppmfile", zwriteppmfile},
- {"2writestring", zwritestring},
- op_def_end(0)
- };
-
- /* ------ Non-operator routines ------ */
-
- /* Check a file for reading. */
- /* The interpreter calls this to check an executable file. */
- int
- file_check_read(ref *op, stream **ps)
- { if ( !s_is_reading(*ps = fptr(op)) )
- return_error(e_invalidaccess);
- return 0;
- }
-
- /* Get the current file from which the interpreter is reading. */
- private es_ptr
- zget_current_file(void)
- { register es_ptr ep = esp;
- while ( ep >= esbot )
- { if ( r_has_type_attrs(ep, t_file, a_executable) )
- return ep;
- ep--;
- }
- return (es_ptr)0;
- }
-
- /* When closing a file, check whether it is the current file, */
- /* and if so, clear the cache. */
- void
- check_close_current_file(stream *s)
- { /* If we just closed the file from which the interpreter */
- /* is reading, zap it on the exec stack. */
- es_ptr cfp = zget_current_file();
- if ( cfp != 0 && fptr(cfp) == s )
- { /* A null would confuse the estack parser.... */
- make_tasv(cfp, t_array, a_executable+a_execute, 0, refs, (ref *)0);
- esfile = 0; /* clear currentfile cache */
- }
- }
-
- /* Switch a file open for read/write access but currently in write mode */
- /* to read mode. Return 1 if OK, 0 if not. */
- int
- file_switch_to_read(ref *op)
- { stream *s = fptr(op);
- uint modes = s->modes;
- long pos;
- if ( s->write_id != r_size(op) ) /* not valid */
- return 0;
- pos = stell(s);
- if ( sflush(s) < 0 )
- return 0;
- s->read_id = s->write_id; /* enable reading */
- s->write_id = 0; /* disable writing */
- sread_file(s, s->file, s->cbuf, s->cbsize);
- fseek(s->file, 0L, SEEK_CUR); /* pacify C library */
- s->modes |= modes & s_mode_append; /* don't lose append info */
- s->position = pos;
- return 1;
- }
-
- /* Switch a file open for read/write access but currently in read mode */
- /* to write mode. Return 1 if OK, 0 if not. */
- int
- file_switch_to_write(ref *op)
- { stream *s = fptr(op);
- uint modes = s->modes;
- long pos;
- if ( s->read_id != r_size(op) ) /* not valid */
- return 0;
- pos = stell(s);
- s->write_id = s->read_id; /* enable writing */
- s->read_id = 0; /* disable reading */
- fseek(s->file, pos, SEEK_SET); /* pacify C library */
- if ( modes & s_mode_append )
- sappend_file(s, s->file, s->cbuf, s->cbsize); /* sets position */
- else
- { swrite_file(s, s->file, s->cbuf, s->cbsize);
- s->position = pos;
- }
- return 1;
- }
-
- /* ------ Internal routines ------ */
-
- /* Write a string on a file. The file has been checked for validity, */
- /* but not the string. */
- private int
- write_string(os_ptr op, stream *s)
- { uint len;
- check_read_type(*op, t_string);
- len = r_size(op);
- if ( sputs(s, op->value.bytes, len) != len )
- return_error(e_ioerror);
- return 0;
- }
-