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- /* 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"
- #ifdef VMS
- #include <errno.h> /* Need this to make errno declaration right */
- #include <perror.h> /* Need this to make sys_errlist/sys_nerr right */
- #endif /* VMS */
- #ifdef NeXT /* .include feature */
- #include <sys/file.h>
- #include <sys/param.h>
- #endif NeXT /* .include feature */
-
- /*
- * 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.
- */
-
- #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.
- */
-
- #ifndef NeXT /* generate stabs for debugging assembly code */
- static
- #endif NeXT /* generate stabs for debugging assembly code */
- char * physical_input_file,
- * logical_input_file;
-
- #ifdef NeXT /* .include feature */
- int doing_include = FALSE; /* DJA -- TRUE when we are processing a .include */
- #endif NeXT /* .include feature */
-
- typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
- /* A line ends in '\n' or eof. */
-
- #ifndef NeXT /* generate stabs for debugging assembly code */
- static
- #endif NeXT /* generate stabs for debugging assembly code */
- line_numberT physical_input_line,
- logical_input_line;
-
- 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);
- }
-
- /*
- * 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 ( line_number >= 0 )
- {
- logical_input_line = line_number;
- }
- }
-
- /*
- * 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
- }
- }
-
-
-
- /*
- * a s _ p e r r o r
- *
- * Like perror(3), but with more info.
- */
- void
- as_perror(gripe, filename)
- char * gripe; /* Unpunctuated error theme. */
- char * filename;
- {
- extern int errno; /* See perror(3) for details. */
- extern int sys_nerr;
- extern char * sys_errlist[];
-
- fprintf (stderr,"as:file(%s) %s! ",
- filename, gripe
- );
- if (errno > sys_nerr)
- {
- fprintf (stderr, "Unknown error #%d.", errno);
- }
- else
- {
- fprintf (stderr, "%s.", sys_errlist [errno]);
- }
- (void)putc('\n', stderr);
- errno = 0; /* After reporting, clear it. */
- if (input_file_is_open()) /* RMS says don't mention line # if not needed. */
- {
- as_where();
- }
- }
-
- /*
- * 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);
- }
-
- #ifdef NeXT /* .include feature */
- void
- read_an_include_file (no_path_name) /* DJA -- added for .include pseudo op support */
- char * no_path_name;
- {
- char * buffer;
- int buffer_length;
- extern char * buffer_limit;
- extern int doing_include;
- extern FILE * f_in;
- extern char * file_name;
- extern char * input_line_pointer;
- char * last_buffer_limit;
- char * last_buffer_start;
- int last_doing_include;
- FILE * last_f_in;
- char * last_file_name;
- char * last_input_line_pointer;
- char * last_logical_input_file;
- line_numberT last_logical_input_line;
- int last_partial_size;
- char * last_partial_where;
- char * last_physical_input_file;
- line_numberT last_physical_input_line;
- char last_save_source [AFTER_SIZE];
- #if 0
- char * last_save_buffer;
- #endif
- char name_buffer [MAXPATHLEN];
- scrub_context_data scrub_context;
- register struct directory_stack * the_path_pointer;
- register char * whole_file_name;
-
- extern struct directory_stack *include; /* First dir to search */
-
- /*
- * figure out what directory the file name is in.
- */
- whole_file_name = no_path_name;
- if (access(whole_file_name, R_OK))
- {
- whole_file_name = name_buffer;
- the_path_pointer = include;
- while (the_path_pointer)
- {
- if (strlen (the_path_pointer->fname) + (strlen (no_path_name)) >= MAXPATHLEN)
- as_warn ("include file name too long: \"%s%s\"", the_path_pointer->fname, no_path_name);
- else
- {
- *whole_file_name = '\0';
- strcpy (whole_file_name, the_path_pointer->fname);
- strcat (whole_file_name, "/");
- strcat (whole_file_name, no_path_name);
- if (!access(whole_file_name, R_OK))
- goto found;
- }
- the_path_pointer = the_path_pointer->next;
- }
- the_path_pointer = include_defaults;
- while (the_path_pointer->fname != NULL)
- {
- if (strlen (the_path_pointer->fname) + (strlen (no_path_name)) >= MAXPATHLEN)
- as_warn ("include file name too long: \"%s%s\"", the_path_pointer->fname, no_path_name);
- else
- {
- *whole_file_name = '\0';
- strcpy (whole_file_name, the_path_pointer->fname);
- strcat (whole_file_name, "/");
- strcat (whole_file_name, no_path_name);
- if (!access(whole_file_name, R_OK))
- goto found;
- }
- the_path_pointer++;
- }
- as_fatal ("Couldn't find the include file: \"%s\"", no_path_name);
- return;
- }
- found:
- /*
- * save a copy of the file state for a recursive call to read a file
- */
- last_buffer_limit = buffer_limit;
- last_buffer_start = buffer_start;
- last_doing_include = doing_include;
- last_f_in = f_in;
- last_file_name = file_name;
- last_input_line_pointer = input_line_pointer;
- last_logical_input_file = logical_input_file;
- last_logical_input_line = logical_input_line;
- last_partial_size = partial_size;
- last_partial_where = partial_where;
- last_physical_input_file = physical_input_file;
- last_physical_input_line = physical_input_line;
- bcopy (save_source, last_save_source, sizeof (save_source));
- save_scrub_context (&scrub_context);
- /*
- * set up for another file
- */
- partial_size = 0;
- doing_include = TRUE;
- input_scrub_begin ();
- buffer = input_scrub_new_file (whole_file_name);
- if (f_in != (FILE *)0)
- read_a_source_file(buffer);
-
- xfree (buffer_start);
- /*
- * restore the file state
- */
- buffer_limit = last_buffer_limit;
- buffer_start = last_buffer_start;
- doing_include = last_doing_include;
- f_in = last_f_in;
- file_name = last_file_name;
- input_line_pointer = last_input_line_pointer;
- logical_input_file = last_logical_input_file;
- logical_input_line = last_logical_input_line;
- partial_size = last_partial_size;
- partial_where = last_partial_where;
- physical_input_file = last_physical_input_file;
- physical_input_line = last_physical_input_line;
- bcopy (last_save_source, save_source, sizeof (save_source));
- restore_scrub_context (&scrub_context);
- } /* read_an_include_file */
- #endif NeXT /* .include feature */
-
- /* end: input_scrub.c */
-