/* input_file.c - Deal with Input Files -
- Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 98, 1999
- Free Software Foundation, Inc.
+ Copyright (C) 1987-2020 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 2, or (at your option)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
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, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
-/*
- * 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!
- */
-
-#include <stdio.h>
-#include <string.h>
+/* 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! */
#include "as.h"
#include "input-file.h"
-
-static int input_file_get PARAMS ((char *, int));
+#include "safe-ctype.h"
/* 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.
- */
+ preprocessed by app. It is zero if the file can be read straight in. */
int preprocess = 0;
-/*
- * 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.
- */
+/* 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. */
#define BUFFER_SIZE (32 * 1024)
-/*
- * We use static data: the data area is not sharable.
- */
+/* We use static data: the data area is not sharable. */
static FILE *f_in;
-static char *file_name;
+static const char *file_name;
/* 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;
+ FILE * f_in;
+ const char * file_name;
+ int preprocess;
+ char * app_save;
};
\f
-/* These hooks accomodate most operating systems. */
+/* These hooks accommodate most operating systems. */
-void
-input_file_begin ()
+void
+input_file_begin (void)
{
f_in = (FILE *) 0;
}
-void
-input_file_end ()
+void
+input_file_end (void)
{
}
-/* Return BUFFER_SIZE. */
-unsigned int
-input_file_buffer_size ()
+/* Return BUFFER_SIZE. */
+size_t
+input_file_buffer_size (void)
{
return (BUFFER_SIZE);
}
-int
-input_file_is_open ()
-{
- return f_in != (FILE *) 0;
-}
-
/* Push the state of our input, returning a pointer to saved info that
can be restored with input_file_pop (). */
+
char *
-input_file_push ()
+input_file_push (void)
{
- register struct saved_file *saved;
+ struct saved_file *saved;
- saved = (struct saved_file *) xmalloc (sizeof *saved);
+ saved = XNEW (struct saved_file);
saved->f_in = f_in;
saved->file_name = file_name;
if (preprocess)
saved->app_save = app_push ();
- input_file_begin (); /* Initialize for new file */
+ /* Initialize for new file. */
+ input_file_begin ();
return (char *) saved;
}
void
-input_file_pop (arg)
- char *arg;
+input_file_pop (char *arg)
{
- register struct saved_file *saved = (struct saved_file *) arg;
+ struct saved_file *saved = (struct saved_file *) arg;
- input_file_end (); /* Close out old file */
+ input_file_end (); /* Close out old file. */
f_in = saved->f_in;
file_name = saved->file_name;
free (arg);
}
\f
+/* Open the specified file, "" means stdin. Filename must not be null. */
+
void
-input_file_open (filename, pre)
- char *filename; /* "" means use stdin. Must not be 0. */
- int pre;
+input_file_open (const char *filename,
+ int pre)
{
int c;
char buf[80];
preprocess = pre;
- assert (filename != 0); /* Filename may not be NULL. */
+ gas_assert (filename != 0); /* Filename may not be NULL. */
if (filename[0])
- { /* We have a file name. Suck it and see. */
- f_in = fopen (filename, "r");
+ {
+ f_in = fopen (filename, FOPEN_RT);
file_name = filename;
}
else
- { /* use stdin for the input file. */
+ {
+ /* Use stdin for the input file. */
f_in = stdin;
- file_name = _("{standard input}"); /* For error messages. */
+ /* For error messages. */
+ file_name = _("{standard input}");
}
- if (f_in == (FILE *) 0)
+
+ if (f_in == NULL)
{
- as_bad (_("Can't open %s for reading."), file_name);
- as_perror ("%s", file_name);
+ as_bad (_("can't open %s for reading: %s"),
+ file_name, xstrerror (errno));
return;
}
c = getc (f_in);
+
+ if (ferror (f_in))
+ {
+ as_bad (_("can't read from %s: %s"),
+ file_name, xstrerror (errno));
+
+ fclose (f_in);
+ f_in = NULL;
+ return;
+ }
+
+ /* Check for an empty input file. */
+ if (feof (f_in))
+ {
+ fclose (f_in);
+ f_in = NULL;
+ return;
+ }
+ gas_assert (c != EOF);
+
if (c == '#')
- { /* Begins with comment, may not want to preprocess */
+ {
+ /* Begins with comment, may not want to preprocess. */
c = getc (f_in);
if (c == 'N')
{
- fgets (buf, 80, f_in);
- if (!strcmp (buf, "O_APP\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 */
+ 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);
}
}
/* Close input file. */
-void
-input_file_close ()
+
+void
+input_file_close (void)
{
+ /* Don't close a null file pointer. */
if (f_in != NULL)
- {
- fclose (f_in);
- } /* don't close a null file pointer */
+ fclose (f_in);
+
f_in = 0;
-} /* input_file_close() */
+}
/* This function is passed to do_scrub_chars. */
-static int
-input_file_get (buf, buflen)
- char *buf;
- int buflen;
+static size_t
+input_file_get (char *buf, size_t buflen)
{
- int size;
+ size_t size;
+
+ if (feof (f_in))
+ return 0;
size = fread (buf, sizeof (char), buflen, f_in);
- if (size < 0)
- {
- as_perror (_("Can't read from %s"), file_name);
- size = 0;
- }
+ if (ferror (f_in))
+ as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno));
return size;
}
/* Read a buffer from the input file. */
char *
-input_file_give_next_buffer (where)
- char *where; /* Where to place 1st character of new buffer. */
+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. */
- register int size;
+ char *return_value; /* -> Last char of what we read, + 1. */
+ size_t size;
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.
- */
+ /* 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 = fread (where, sizeof (char), BUFFER_SIZE, f_in);
- if (size < 0)
- {
- as_perror (_("Can't read from %s"), file_name);
- size = 0;
- }
+ size = input_file_get (where, BUFFER_SIZE);
+
if (size)
return_value = where + size;
else
{
if (fclose (f_in))
- as_perror (_("Can't close %s"), file_name);
+ as_warn (_("can't close %s: %s"), file_name, xstrerror (errno));
+
f_in = (FILE *) 0;
return_value = 0;
}
- return (return_value);
-}
-/* end of input-file.c */
+ return return_value;
+}
projects / deliverable / binutils-gdb.git / blobdiff