/* $OpenBSD: input-file.c,v 1.3 2001/07/09 07:04:35 deraadt Exp $ */ /* input_file.c - Deal with Input Files - Copyright (C) 1987, 1990, 1991, 1992 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, 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! */ #ifndef lint static char rcsid[] = "$OpenBSD: input-file.c,v 1.3 2001/07/09 07:04:35 deraadt Exp $"; #endif #ifdef USG #define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size)) #endif #include #include #include "as.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; /* * 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. */ FILE *f_in; /* static JF remove static so app.c can use file_name */ 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. */ 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); } #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; (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, (char *)NULL); execl ("app","app",(char *)NULL); (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_bad( "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 HO_VMS /* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically allocated buffer. */ setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE); #endif /* HO_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 (!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); #ifdef DONTDEF if ( preprocess ) { char temporary_file_name[17]; 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 /* 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() */ 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) { char *p; int n; int ch; extern FILE *scrub_file; 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 of input-file.c */