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Diffstat (limited to 'gas/input-file.c')
| -rw-r--r-- | gas/input-file.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/gas/input-file.c b/gas/input-file.c new file mode 100644 index 0000000..cf1a4c3 --- /dev/null +++ b/gas/input-file.c @@ -0,0 +1,322 @@ +/* input_file.c - Deal with Input Files - + Copyright (C) 1987, 1990, 1991 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. */ + +/* static const char rcsid[] = "$Id$"; */ + +/* + * 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! + */ + +#ifdef USG +#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size)) +#endif + +#include <stdio.h> +#include <assert.h> +#include <string.h> + +#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, 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_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 VMS + /* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically + allocated buffer. */ + setvbuf(f_in, (char *)NULL, _IOFBF, 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 (!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() { + fclose (f_in); + f_in = 0; +} + +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); +} |