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/* input_file.c - Deal with Input Files - |
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, |
2002, 2003, 2005, 2006, 2007, 2009, 2012 |
Free Software Foundation, Inc. |
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This file is part of GAS, the GNU Assembler. |
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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 3, or (at your option) |
any later version. |
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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, 51 Franklin Street - Fifth Floor, Boston, MA |
02110-1301, USA. */ |
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/* Confines all details of reading source bytes to this module. |
All O/S specific crocks should live here. |
What we lose in "efficiency" we gain in modularity. |
Note we don't need to #include the "as.h" file. No common coupling! */ |
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#include "as.h" |
#include "input-file.h" |
#include "safe-ctype.h" |
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/* This variable is non-zero if the file currently being read should be |
preprocessed by app. It is zero if the file can be read straight in. */ |
int preprocess = 0; |
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/* This code opens a file, then delivers BUFFER_SIZE character |
chunks of the file on demand. |
BUFFER_SIZE is supposed to be a number chosen for speed. |
The caller only asks once what BUFFER_SIZE is, and asks before |
the nature of the input files (if any) is known. */ |
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#define BUFFER_SIZE (32 * 1024) |
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/* We use static data: the data area is not sharable. */ |
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static FILE *f_in; |
static char *file_name; |
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/* Struct for saving the state of this module for file includes. */ |
struct saved_file |
{ |
FILE * f_in; |
char * file_name; |
int preprocess; |
char * app_save; |
}; |
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/* These hooks accommodate most operating systems. */ |
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void |
input_file_begin (void) |
{ |
f_in = (FILE *) 0; |
} |
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void |
input_file_end (void) |
{ |
} |
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/* Return BUFFER_SIZE. */ |
size_t |
input_file_buffer_size (void) |
{ |
return (BUFFER_SIZE); |
} |
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/* Push the state of our input, returning a pointer to saved info that |
can be restored with input_file_pop (). */ |
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char * |
input_file_push (void) |
{ |
register struct saved_file *saved; |
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saved = (struct saved_file *) xmalloc (sizeof *saved); |
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saved->f_in = f_in; |
saved->file_name = file_name; |
saved->preprocess = preprocess; |
if (preprocess) |
saved->app_save = app_push (); |
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/* Initialize for new file. */ |
input_file_begin (); |
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return (char *) saved; |
} |
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void |
input_file_pop (char *arg) |
{ |
register struct saved_file *saved = (struct saved_file *) arg; |
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input_file_end (); /* Close out old file. */ |
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f_in = saved->f_in; |
file_name = saved->file_name; |
preprocess = saved->preprocess; |
if (preprocess) |
app_pop (saved->app_save); |
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free (arg); |
} |
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void |
input_file_open (char *filename, /* "" means use stdin. Must not be 0. */ |
int pre) |
{ |
int c; |
char buf[80]; |
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preprocess = pre; |
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gas_assert (filename != 0); /* Filename may not be NULL. */ |
if (filename[0]) |
{ |
f_in = fopen (filename, FOPEN_RT); |
file_name = filename; |
} |
else |
{ |
/* Use stdin for the input file. */ |
f_in = stdin; |
/* For error messages. */ |
file_name = _("{standard input}"); |
} |
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if (f_in == NULL) |
{ |
as_bad (_("can't open %s for reading: %s"), |
file_name, xstrerror (errno)); |
return; |
} |
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c = getc (f_in); |
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if (ferror (f_in)) |
{ |
as_bad (_("can't read from %s: %s"), |
file_name, xstrerror (errno)); |
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fclose (f_in); |
f_in = NULL; |
return; |
} |
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/* Check for an empty input file. */ |
if (feof (f_in)) |
{ |
fclose (f_in); |
f_in = NULL; |
return; |
} |
gas_assert (c != EOF); |
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if (c == '#') |
{ |
/* Begins with comment, may not want to preprocess. */ |
c = getc (f_in); |
if (c == 'N') |
{ |
if (fgets (buf, sizeof (buf), f_in) |
&& !strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) |
preprocess = 0; |
if (!strchr (buf, '\n')) |
ungetc ('#', f_in); /* It was longer. */ |
else |
ungetc ('\n', f_in); |
} |
else if (c == 'A') |
{ |
if (fgets (buf, sizeof (buf), f_in) |
&& !strncmp (buf, "PP", 2) && ISSPACE (buf[2])) |
preprocess = 1; |
if (!strchr (buf, '\n')) |
ungetc ('#', f_in); |
else |
ungetc ('\n', f_in); |
} |
else if (c == '\n') |
ungetc ('\n', f_in); |
else |
ungetc ('#', f_in); |
} |
else |
ungetc (c, f_in); |
} |
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/* Close input file. */ |
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void |
input_file_close (void) |
{ |
/* Don't close a null file pointer. */ |
if (f_in != NULL) |
fclose (f_in); |
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f_in = 0; |
} |
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/* This function is passed to do_scrub_chars. */ |
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static size_t |
input_file_get (char *buf, size_t buflen) |
{ |
size_t size; |
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if (feof (f_in)) |
return 0; |
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size = fread (buf, sizeof (char), buflen, f_in); |
if (ferror (f_in)) |
as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno)); |
return size; |
} |
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/* Read a buffer from the input file. */ |
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char * |
input_file_give_next_buffer (char *where /* Where to place 1st character of new buffer. */) |
{ |
char *return_value; /* -> Last char of what we read, + 1. */ |
size_t size; |
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if (f_in == (FILE *) 0) |
return 0; |
/* fflush (stdin); could be done here if you want to synchronise |
stdin and stdout, for the case where our input file is stdin. |
Since the assembler shouldn't do any output to stdout, we |
don't bother to synch output and input. */ |
if (preprocess) |
size = do_scrub_chars (input_file_get, where, BUFFER_SIZE); |
else |
size = input_file_get (where, BUFFER_SIZE); |
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if (size) |
return_value = where + size; |
else |
{ |
if (fclose (f_in)) |
as_warn (_("can't close %s: %s"), file_name, xstrerror (errno)); |
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f_in = (FILE *) 0; |
return_value = 0; |
} |
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return return_value; |
} |