/*- * This code is derived from software copyrighted by the Free Software * Foundation. * * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. */ #ifndef lint /*static char sccsid[] = "from: @(#)input-file.c 6.2 (Berkeley) 5/8/91";*/ static char rcsid[] = "$Id: input-file.c,v 1.2 1993/08/01 18:48:45 mycroft Exp $"; #endif /* not lint */ /* 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 #include /* #include #include #include #include */ /* #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; /* 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; } #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 */