+/* input_file.c - Deal with Input Files -
+ Copyright (C) 1987 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. */
+
+/*
+ * 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!
+ */
+
+#define NDEBUG /* JF remove asserts */
+
+#ifdef USG
+#define index strchr
+/* JF: What's the difference between _IOLBF and _IOFBF ? */
+#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
+#endif
+
+#include <stdio.h>
+#include <assert.h>
+/* #include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <sys/wait.h> */
+
+/* #include "style.h" */
+#include "input-file.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.
+ */
+int preprocess = 0;
+
+void as_perror();
+
+/*
+ * 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)
+
+static char in_buf[BUFFER_SIZE];
+
+/*
+ * We use static data: the data area is not sharable.
+ */
+
+FILE *f_in; /* JF do things the RIGHT way */
+/* static JF remove static so app.c can use file_name */
+char * file_name;
+\f
+/* These hooks accomodate most operating systems. */
+
+void
+input_file_begin ()
+{
+ /* file_handle = -1; */
+ f_in = (FILE *)0;
+}
+
+void
+input_file_end ()
+{
+}
+
+int /* Return BUFFER_SIZE. */
+input_file_buffer_size ()
+{
+ return (BUFFER_SIZE);
+}
+
+int
+input_file_is_open ()
+{
+ /* return (file_handle >= 0); */
+ return f_in!=(FILE *)0;
+}
+\f
+#ifdef DONTDEF /* JF save old version in case we need it */
+void
+input_file_open (filename, preprocess, debugging)
+ char * filename; /* "" means use stdin. Must not be 0. */
+ int preprocess; /* TRUE if needs app. */
+ int debugging; /* TRUE if we are debugging assembler. */
+{
+ assert( filename != 0 ); /* Filename may not be NULL. */
+ if (filename [0])
+ { /* We have a file name. Suck it and see. */
+ file_handle = open (filename, O_RDONLY, 0);
+ file_name = filename;
+ }
+ else
+ { /* use stdin for the input file. */
+ file_handle = fileno (stdin);
+ file_name = "{standard input}"; /* For error messages. */
+ }
+ if (file_handle < 0)
+ as_perror ("Can't open %s for reading", file_name);
+ if ( preprocess )
+ {
+/*
+ * This code was written in haste for a frobbed BSD 4.2.
+ * I have a flight to catch: will someone please do proper
+ * error checks? - Dean.
+ */
+ int pid;
+ char temporary_file_name [12];
+ int fd;
+ union wait status;
+ char *mktemp();
+
+ (void)strcpy (temporary_file_name, "#appXXXXXX");
+ (void)mktemp (temporary_file_name);
+ pid = vfork ();
+ if (pid == -1)
+ {
+ as_perror ("Vfork failed", file_name);
+ _exit (144);
+ }
+ if (pid == 0)
+ {
+ (void)dup2 (file_handle, fileno(stdin));
+ fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
+ if (fd == -1)
+ {
+ (void)write(2,"Can't open temporary\n",21);
+ _exit (99);
+ }
+ (void)dup2 (fd, fileno(stdout));
+/* JF for testing #define PREPROCESSOR "/lib/app" */
+#define PREPROCESSOR "./app"
+ execl (PREPROCESSOR, PREPROCESSOR, 0);
+ execl ("app","app",0);
+ (void)write(2,"Exec of app failed. Get help.\n",31);
+ (void)unlink(temporary_file_name);
+ _exit (11);
+ }
+ (void)wait (& status);
+ if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
+ {
+ file_handle = -1;
+ as_warn( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status );
+ }
+ else
+ {
+ file_handle = open (temporary_file_name, O_RDONLY, 0);
+ if ( ! debugging && unlink(temporary_file_name))
+ as_perror ("Can't delete temp file %s", temporary_file_name);
+ }
+ if (file_handle == -1)
+ as_perror ("Can't retrieve temp file %s", temporary_file_name);
+ }
+}
+#else
+
+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_perror ("Can't open %s for reading", file_name);
+ return;
+ }
+#ifndef VMS
+ setbuffer(f_in,in_buf,BUFFER_SIZE);
+#endif /* VMS */
+ 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(!index(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);
+
+#ifdef DONTDEF
+ if ( preprocess ) {
+ char temporary_file_name [17];
+ char *mktemp();
+ FILE *f_out;
+
+ (void)strcpy (temporary_file_name, "/tmp/#appXXXXXX");
+ (void)mktemp (temporary_file_name);
+ f_out=fopen(temporary_file_name,"w+");
+ if(f_out==(FILE *)0)
+ as_perror("Can't open temp file %s",temporary_file_name);
+
+ /* JF this will have to be moved on any system that
+ does not support removal of open files. */
+ (void)unlink(temporary_file_name);/* JF do it NOW */
+ do_scrub(f_in,f_out);
+ (void)fclose(f_in); /* All done with it */
+ (void)rewind(f_out);
+ f_in=f_out;
+ }
+#endif
+}
+#endif
+
+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.
+ */
+ /* size = read (file_handle, where, BUFFER_SIZE); */
+ if(preprocess) {
+ char *p;
+ int n;
+ int ch;
+ extern FILE *scrub_file;
+ int scrub_from_file();
+ void scrub_to_file();
+ int do_scrub_next_char();
+
+ scrub_file=f_in;
+ for(p=where,n=BUFFER_SIZE;n;--n) {
+ ch=do_scrub_next_char(scrub_from_file,scrub_to_file);
+ if(ch==EOF)
+ break;
+ *p++=ch;
+ }
+ size=BUFFER_SIZE-n;
+ } 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: input_file.c */
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