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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /gas/input-file.c
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19990502 sourceware importbinu_ss_19990502
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+/* input_file.c - Deal with Input Files -
+ Copyright (C) 1987, 1990, 1991, 1992, 1998 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)
+ 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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>
+
+#include "as.h"
+#include "input-file.h"
+
+static int input_file_get PARAMS ((char **));
+
+/* 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;
+
+/*
+ * 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.
+ */
+
+static FILE *f_in;
+static 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;
+ };
+
+/* These hooks accomodate most operating systems. */
+
+void
+input_file_begin ()
+{
+ f_in = (FILE *) 0;
+}
+
+void
+input_file_end ()
+{
+}
+
+/* Return BUFFER_SIZE. */
+unsigned int
+input_file_buffer_size ()
+{
+ 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 ()
+{
+ register struct saved_file *saved;
+
+ saved = (struct saved_file *) xmalloc (sizeof *saved);
+
+ saved->f_in = f_in;
+ saved->file_name = file_name;
+ saved->preprocess = preprocess;
+ if (preprocess)
+ saved->app_save = app_push ();
+
+ input_file_begin (); /* Initialize for new file */
+
+ return (char *) saved;
+}
+
+void
+input_file_pop (arg)
+ char *arg;
+{
+ register struct saved_file *saved = (struct saved_file *) arg;
+
+ input_file_end (); /* Close out old file */
+
+ f_in = saved->f_in;
+ file_name = saved->file_name;
+ preprocess = saved->preprocess;
+ if (preprocess)
+ app_pop (saved->app_save);
+
+ free (arg);
+}
+
+void
+input_file_open (filename, pre)
+ char *filename; /* "" means use stdin. Must not be 0. */
+ int pre;
+{
+ int c;
+ char buf[80];
+
+ preprocess = pre;
+
+ 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");
+ file_name = filename;
+ }
+ else
+ { /* use stdin for the input file. */
+ f_in = stdin;
+ file_name = _("{standard input}"); /* For error messages. */
+ }
+ if (f_in == (FILE *) 0)
+ {
+ as_bad (_("Can't open %s for reading."), file_name);
+ as_perror ("%s", file_name);
+ return;
+ }
+
+ c = getc (f_in);
+ if (c == '#')
+ { /* 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"))
+ preprocess = 0;
+ if (!strchr (buf, '\n'))
+ ungetc ('#', f_in); /* It was longer */
+ else
+ ungetc ('\n', f_in);
+ }
+ else if (c == '\n')
+ ungetc ('\n', f_in);
+ else
+ ungetc ('#', f_in);
+ }
+ else
+ ungetc (c, f_in);
+}
+
+/* Close input file. */
+void
+input_file_close ()
+{
+ if (f_in != NULL)
+ {
+ fclose (f_in);
+ } /* don't close a null file pointer */
+ f_in = 0;
+} /* input_file_close() */
+
+/* This function is passed to do_scrub_chars. */
+
+static int
+input_file_get (from)
+ char **from;
+{
+ static char buf[BUFFER_SIZE];
+ int 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;
+ 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. */
+{
+ char *return_value; /* -> Last char of what we read, + 1. */
+ register int 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.
+ */
+ 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;
+ }
+ if (size)
+ return_value = where + size;
+ else
+ {
+ if (fclose (f_in))
+ as_perror (_("Can't close %s"), file_name);
+ f_in = (FILE *) 0;
+ return_value = 0;
+ }
+ return (return_value);
+}
+
+/* end of input-file.c */