/* input_file.c - Deal with Input Files -
- Copyright (C) 1987, 1990, 1991, 1992, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1987-2021 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,
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 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. */
-/*
- * 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 **));
+#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 (from)
- char **from;
+static size_t
+input_file_get (char *buf, size_t buflen)
{
- static char buf[BUFFER_SIZE];
- int size;
+ size_t size;
- size = fread (buf, sizeof (char), sizeof buf, f_in);
- if (size < 0)
- {
- as_perror (_("Can't read from %s"), file_name);
- size = 0;
- }
- *from = buf;
+ if (feof (f_in))
+ return 0;
+
+ 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;
}
/* 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 / thirdparty / binutils-gdb.git / blobdiff