+/* input_scrub.c - layer between app and the rest of the world
+ Copyright (C) 1987 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GAS is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GAS; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "as.h"
+#include "read.h"
+#include "input-file.h"
+
+/*
+ * O/S independent module to supply buffers of sanitised source code
+ * to rest of assembler. We get raw input data of some length.
+ * Also looks after line numbers, for e.g. error messages.
+ * This module used to do the sanitising, but now a pre-processor program
+ * (app) does that job so this module is degenerate.
+ * Now input is pre-sanitised, so we only worry about finding the
+ * last partial line. A buffer of full lines is returned to caller.
+ * The last partial line begins the next buffer we build and return to caller.
+ * The buffer returned to caller is preceeded by BEFORE_STRING and followed
+ * by AFTER_STRING. The last character before AFTER_STRING is a newline.
+ */
+
+/*
+ * We expect the following sanitation has already been done.
+ *
+ * No comments, reduce a comment to a space.
+ * Reduce a tab to a space unless it is 1st char of line.
+ * All multiple tabs and spaces collapsed into 1 char. Tab only
+ * legal if 1st char of line.
+ * # line file statements converted to .line x;.file y; statements.
+ * Escaped newlines at end of line: remove them but add as many newlines
+ * to end of statement as you removed in the middle, to synch line numbers.
+ */
+\f
+#define BEFORE_STRING ("\n")
+#define AFTER_STRING ("\0") /* bcopy of 0 chars might choke. */
+#define BEFORE_SIZE (1)
+#define AFTER_SIZE (1)
+
+static char * buffer_start; /* -> 1st char of full buffer area. */
+static char * partial_where; /* -> after last full line in buffer. */
+static int partial_size; /* >=0. Number of chars in partial line in buffer. */
+static char save_source [AFTER_SIZE];
+ /* Because we need AFTER_STRING just after last */
+ /* full line, it clobbers 1st part of partial */
+ /* line. So we preserve 1st part of partial */
+ /* line here. */
+static int buffer_length; /* What is the largest size buffer that */
+ /* input_file_give_next_buffer() could */
+ /* return to us? */
+
+static void as_1_char ();
+
+/*
+We never have more than one source file open at once.
+We may, however, read more than 1 source file in an assembly.
+NULL means we have no file open right now.
+*/
+
+
+/*
+We must track the physical file and line number for error messages.
+We also track a "logical" file and line number corresponding to (C?)
+compiler source line numbers.
+Whenever we open a file we must fill in physical_input_file. So if it is NULL
+we have not opened any files yet.
+*/
+
+static
+char * physical_input_file,
+ * logical_input_file;
+
+
+
+typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
+ /* A line ends in '\n' or eof. */
+
+static
+line_numberT physical_input_line,
+ logical_input_line;
+\f
+void
+input_scrub_begin ()
+{
+ know( strlen(BEFORE_STRING) == BEFORE_SIZE );
+ know( strlen( AFTER_STRING) == AFTER_SIZE );
+
+ input_file_begin ();
+
+ buffer_length = input_file_buffer_size ();
+
+ buffer_start = xmalloc ((long)(BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
+ bcopy (BEFORE_STRING, buffer_start, (int)BEFORE_SIZE);
+
+ /* Line number things. */
+ logical_input_line = 0;
+ logical_input_file = (char *)NULL;
+ physical_input_file = NULL; /* No file read yet. */
+ do_scrub_begin();
+}
+
+void
+input_scrub_end ()
+{
+ input_file_end ();
+}
+
+char * /* Return start of caller's part of buffer. */
+input_scrub_new_file (filename)
+ char * filename;
+{
+ input_file_open (filename, !flagseen['f']);
+ physical_input_file = filename[0] ? filename : "{standard input}";
+ physical_input_line = 0;
+
+ partial_size = 0;
+ return (buffer_start + BEFORE_SIZE);
+}
+
+char *
+input_scrub_next_buffer (bufp)
+char **bufp;
+{
+ register char * limit; /* -> just after last char of buffer. */
+
+#ifdef DONTDEF
+ if(preprocess) {
+ if(save_buffer) {
+ *bufp = save_buffer;
+ save_buffer = 0;
+ }
+ limit = input_file_give_next_buffer(buffer_start+BEFORE_SIZE);
+ if (!limit) {
+ partial_where = 0;
+ if(partial_size)
+ as_warn("Partial line at end of file ignored");
+ return partial_where;
+ }
+
+ if(partial_size)
+ bcopy(save_source, partial_where,(int)AFTER_SIZE);
+ do_scrub(partial_where,partial_size,buffer_start+BEFORE_SIZE,limit-(buffer_start+BEFORE_SIZE),&out_string,&out_length);
+ limit=out_string + out_length;
+ for(p=limit;*--p!='\n';)
+ ;
+ p++;
+ if(p<=buffer_start+BEFORE_SIZE)
+ as_fatal("Source line too long. Please change file '%s' and re-make the assembler.",__FILE__);
+
+ partial_where = p;
+ partial_size = limit-p;
+ bcopy(partial_where, save_source,(int)AFTER_SIZE);
+ bcopy(AFTER_STRING, partial_where, (int)AFTER_SIZE);
+
+ save_buffer = *bufp;
+ *bufp = out_string;
+
+ return partial_where;
+ }
+
+ /* We're not preprocessing. Do the right thing */
+#endif
+ if (partial_size)
+ {
+ bcopy (partial_where, buffer_start + BEFORE_SIZE, (int)partial_size);
+ bcopy (save_source, buffer_start + BEFORE_SIZE, (int)AFTER_SIZE);
+ }
+ limit = input_file_give_next_buffer (buffer_start + BEFORE_SIZE + partial_size);
+ if (limit)
+ {
+ register char * p; /* Find last newline. */
+
+ for (p = limit; * -- p != '\n'; )
+ {
+ }
+ ++ p;
+ if (p <= buffer_start + BEFORE_SIZE)
+ {
+ as_fatal ("Source line too long. Please change file %s then rebuild assembler.", __FILE__);
+ }
+ partial_where = p;
+ partial_size = limit - p;
+ bcopy (partial_where, save_source, (int)AFTER_SIZE);
+ bcopy (AFTER_STRING, partial_where, (int)AFTER_SIZE);
+ }
+ else
+ {
+ partial_where = 0;
+ if (partial_size > 0)
+ {
+ as_warn( "Partial line at end of file ignored" );
+ }
+ }
+ return (partial_where);
+}
+\f
+/*
+ * The remaining part of this file deals with line numbers, error
+ * messages and so on.
+ */
+
+
+int
+seen_at_least_1_file () /* TRUE if we opened any file. */
+{
+ return (physical_input_file != NULL);
+}
+
+void
+bump_line_counters ()
+{
+ ++ physical_input_line;
+ ++ logical_input_line;
+}
+\f
+/*
+ * new_logical_line()
+ *
+ * Tells us what the new logical line number and file are.
+ * If the line_number is <0, we don't change the current logical line number.
+ * If the fname is NULL, we don't change the current logical file name.
+ */
+void
+new_logical_line (fname, line_number)
+ char * fname; /* DON'T destroy it! We point to it! */
+ int line_number;
+{
+ if ( fname )
+ {
+ logical_input_file = fname;
+ }
+ if ( line_number >= 0 )
+ {
+ logical_input_line = line_number;
+ }
+}
+\f
+/*
+ * a s _ w h e r e ( )
+ *
+ * Write a line to stderr locating where we are in reading
+ * input source files.
+ * As a sop to the debugger of AS, pretty-print the offending line.
+ */
+void
+as_where()
+{
+ char *p;
+ line_numberT line;
+
+ if (physical_input_file)
+ { /* we tried to read SOME source */
+ if (input_file_is_open())
+ { /* we can still read lines from source */
+#ifdef DONTDEF
+ fprintf (stderr," @ physical line %ld., file \"%s\"",
+ (long) physical_input_line, physical_input_file);
+ fprintf (stderr," @ logical line %ld., file \"%s\"\n",
+ (long) logical_input_line, logical_input_file);
+ (void)putc(' ', stderr);
+ as_howmuch (stderr);
+ (void)putc('\n', stderr);
+#else
+ p = logical_input_file ? logical_input_file : physical_input_file;
+ line = logical_input_line ? logical_input_line : physical_input_line;
+ fprintf(stderr,"%s:%u:", p, line);
+#endif
+ }
+ else
+ {
+#ifdef DONTDEF
+ fprintf (stderr," After reading source.\n");
+#else
+ p = logical_input_file ? logical_input_file : physical_input_file;
+ line = logical_input_line ? logical_input_line : physical_input_line;
+ fprintf (stderr,"%s:unknown:", p);
+#endif
+ }
+ }
+ else
+ {
+#ifdef DONTDEF
+ fprintf (stderr," Before reading source.\n");
+#else
+#endif
+ }
+}
+
+
+
+\f
+/*
+ * a s _ h o w m u c h ( )
+ *
+ * Output to given stream how much of line we have scanned so far.
+ * Assumes we have scanned up to and including input_line_pointer.
+ * No free '\n' at end of line.
+ */
+void
+as_howmuch (stream)
+ FILE * stream; /* Opened for write please. */
+{
+ register char * p; /* Scan input line. */
+ /* register char c; JF unused */
+
+ for (p = input_line_pointer - 1; * p != '\n'; --p)
+ {
+ }
+ ++ p; /* p -> 1st char of line. */
+ for (; p <= input_line_pointer; p++)
+ {
+ /* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */
+ /* c = *p & 0xFF; JF unused */
+ as_1_char (*p, stream);
+ }
+}
+
+static void
+as_1_char (c,stream)
+ unsigned char c;
+ FILE * stream;
+{
+ if ( c > 127 )
+ {
+ (void)putc( '%', stream);
+ c -= 128;
+ }
+ if ( c < 32 )
+ {
+ (void)putc( '^', stream);
+ c += '@';
+ }
+ (void)putc( c, stream);
+}
+
+/* end: input_scrub.c */
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