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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 */
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