From fecd2382e77b89f12c9d630ed4e42e9a54ba6953 Mon Sep 17 00:00:00 2001 From: "K. Richard Pixley" Date: Thu, 4 Apr 1991 18:19:53 +0000 Subject: Initial revision --- gas/input-scrub.c | 478 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 478 insertions(+) create mode 100644 gas/input-scrub.c (limited to 'gas/input-scrub.c') diff --git a/gas/input-scrub.c b/gas/input-scrub.c new file mode 100644 index 0000000..a710913 --- /dev/null +++ b/gas/input-scrub.c @@ -0,0 +1,478 @@ +/* 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 /* 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 */ -- cgit v1.1