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1 files changed, 478 insertions, 0 deletions

diff --git a/gas/input-scrub.c b/gas/input-scrub.c
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+/* input_scrub.c - Break up input buffers into whole numbers of lines.
+   Copyright (C) 1987, 1990, 1991 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. */
+
+/* static const char rcsid[] = "$Id$"; */
+
+#include <errno.h>	/* Need this to make errno declaration right */
+#include "as.h"
+#include "input-file.h"
+
+/*
+ * O/S independent module to supply buffers of sanitised source code
+ * to rest of assembler. We get sanitized input data of arbitrary length.
+ * We break these buffers on line boundaries, recombine pieces that
+ * were broken across buffers, and return a buffer of full lines to
+ * the 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, as sentinels. The last character before AFTER_STRING
+ * is a newline.
+ * Also looks after line numbers, for e.g. error messages.
+ */
+
+/*
+ * We don't care how filthy our buffers are, but our callers assume
+ * that 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.
+ */
+
+#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? */
+
+/* Saved information about the file that .include'd this one.  When we
+   hit EOF, we automatically pop to that file. */
+
+static char *next_saved_file;
+
+/*
+We can have more than one source file open at once, though the info for
+all but the latest one are saved off in a struct input_save.  These
+files remain open, so we are limited by the number of open files allowed
+by the underlying OS.
+We may also sequentially read more than one source file in an assembly.
+ */
+
+
+/*
+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;
+
+/* Struct used to save the state of the input handler during include files */
+struct input_save {
+	char *buffer_start;
+	char *partial_where;
+	int partial_size;
+	char save_source [AFTER_SIZE];
+	int buffer_length;
+	char *physical_input_file;
+	char *logical_input_file;
+	line_numberT	physical_input_line;
+	line_numberT	logical_input_line;
+	char *next_saved_file;	/* Chain of input_saves */
+	char *input_file_save;	/* Saved state of input routines */
+	char *saved_position;	/* Caller's saved position in buf */
+};
+
+#ifdef __STDC__
+static void as_1_char(unsigned int c, FILE *stream);
+#else /* __STDC__ */
+static void as_1_char();
+#endif /* __STDC__ */
+
+/* Push the state of input reading and scrubbing so that we can #include.
+   The return value is a 'void *' (fudged for old compilers) to a save
+   area, which can be restored by passing it to input_scrub_pop(). */
+char *
+input_scrub_push(saved_position)
+	char *saved_position;
+{
+	register struct input_save *saved;
+
+	saved = (struct input_save *) xmalloc(sizeof *saved);
+
+	saved->saved_position		= saved_position;
+	saved->buffer_start		= buffer_start;
+	saved->partial_where		= partial_where;
+	saved->partial_size		= partial_size;
+	saved->buffer_length 		= buffer_length;
+	saved->physical_input_file	= physical_input_file;
+	saved->logical_input_file	= logical_input_file;
+	saved->physical_input_line	= physical_input_line;
+	saved->logical_input_line	= logical_input_line;
+	bcopy (saved->save_source,	  save_source, sizeof (save_source));
+	saved->next_saved_file		= next_saved_file;
+	saved->input_file_save		= input_file_push ();
+
+	input_scrub_begin ();		/* Reinitialize! */
+
+	return (char *)saved;
+}
+
+char *
+input_scrub_pop (arg)
+	char *arg;
+{
+	register struct input_save *saved;
+	char *saved_position;
+
+	input_scrub_end ();	/* Finish off old buffer */
+
+	saved = (struct input_save *)arg;
+
+	input_file_pop 		 (saved->input_file_save);
+	saved_position		= saved->saved_position;
+	buffer_start		= saved->buffer_start;
+	buffer_length 		= saved->buffer_length;
+	physical_input_file	= saved->physical_input_file;
+	logical_input_file	= saved->logical_input_file;
+	physical_input_line	= saved->physical_input_line;
+	logical_input_line	= saved->logical_input_line;
+	partial_where		= saved->partial_where;
+	partial_size		= saved->partial_size;
+	next_saved_file		= saved->next_saved_file;
+	bcopy (save_source,	  saved->save_source, sizeof (save_source));
+
+	free(arg);
+	return saved_position;
+}
+
+
+void
+input_scrub_begin ()
+{
+  know(strlen(BEFORE_STRING) == BEFORE_SIZE);
+  know(strlen(AFTER_STRING) ==  AFTER_SIZE
+	|| (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1));
+
+  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. */
+  next_saved_file = NULL;	/* At EOF, don't pop to any other file */
+  do_scrub_begin();
+}
+
+void
+input_scrub_end ()
+{
+  if (buffer_start)
+    {
+      free (buffer_start);
+      buffer_start = 0;
+      input_file_end ();
+    }
+}
+
+/* Start reading input from a new file. */
+
+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);
+}
+
+
+/* Include a file from the current file.  Save our state, cause it to
+   be restored on EOF, and begin handling a new file.  Same result as
+   input_scrub_new_file. */
+
+char *
+input_scrub_include_file (filename, position)
+     char *filename;
+     char *position;
+{
+   next_saved_file = input_scrub_push (position);
+   return input_scrub_new_file (filename);
+}
+
+void
+input_scrub_close ()
+{
+  input_file_close ();
+}
+char *
+input_scrub_next_buffer (bufp)
+char **bufp;
+{
+  register char *	limit;	/*->just after last char of buffer. */
+
+  *bufp = buffer_start + BEFORE_SIZE;
+
+#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");
+	}
+      /* If we should pop to another file at EOF, do it. */
+      if (next_saved_file)
+	{
+	  *bufp = input_scrub_pop (next_saved_file);	/* Pop state */
+	  /* partial_where is now correct to return, since we popped it. */
+	}
+    }
+  return (partial_where);
+}
+
+/*
+ * 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;
+}
+
+/*
+ *			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 we have a file name */
+	
+	if (line_number >= 0) {
+		logical_input_line = line_number;
+	} /* if we have a line number */
+} /* new_logical_line() */
+
+/*
+ *			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:%d:", p, (int) line);
+#endif
+	}
+    }
+  else
+    {
+#ifdef DONTDEF
+      fprintf (stderr," Before reading source.\n");
+#else
+#endif
+    }
+}
+
+
+
+
+/*
+ *			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 int c;
+FILE *stream;
+{
+  if (c > 127)
+    {
+      (void)putc('%', stream);
+      c -= 128;
+    }
+  if (c < 32)
+    {
+      (void)putc('^', stream);
+      c += '@';
+    }
+  (void)putc(c, stream);
+}
+
+/*
+ * Local Variables:
+ * comment-column: 0
+ * fill-column: 131
+ * End:
+ */
+
+/* end: input_scrub.c */