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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gas/] [input-file.c] - Rev 281
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/* input_file.c - Deal with Input Files - Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2009 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 "as.h" #include "input-file.h" #include "safe-ctype.h" static int input_file_get (char *, int); /* 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 accommodate most operating systems. */ void input_file_begin (void) { f_in = (FILE *) 0; } void input_file_end (void) { } /* Return BUFFER_SIZE. */ unsigned int input_file_buffer_size (void) { return (BUFFER_SIZE); } /* Push the state of our input, returning a pointer to saved info that can be restored with input_file_pop (). */ char * input_file_push (void) { 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 (); /* Initialize for new file. */ input_file_begin (); return (char *) saved; } void input_file_pop (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 (char *filename, /* "" means use stdin. Must not be 0. */ int pre) { int c; char buf[80]; preprocess = pre; gas_assert (filename != 0); /* Filename may not be NULL. */ if (filename[0]) { f_in = fopen (filename, FOPEN_RT); file_name = filename; } else { /* Use stdin for the input file. */ f_in = stdin; /* For error messages. */ file_name = _("{standard input}"); } if (f_in == NULL) { as_bad (_("can't open %s for reading: %s"), file_name, xstrerror (errno)); return; } c = getc (f_in); if (ferror (f_in)) { as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno)); fclose (f_in); f_in = NULL; return; } if (c == '#') { /* Begins with comment, may not want to preprocess. */ c = getc (f_in); if (c == 'N') { if (fgets (buf, sizeof (buf), f_in) && !strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) preprocess = 0; if (!strchr (buf, '\n')) ungetc ('#', f_in); /* It was longer. */ else ungetc ('\n', f_in); } else if (c == 'A') { if (fgets (buf, sizeof (buf), f_in) && !strncmp (buf, "PP", 2) && ISSPACE (buf[2])) preprocess = 1; if (!strchr (buf, '\n')) ungetc ('#', f_in); 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 (void) { /* Don't close a null file pointer. */ if (f_in != NULL) fclose (f_in); f_in = 0; } /* This function is passed to do_scrub_chars. */ static int input_file_get (char *buf, int buflen) { int size; size = fread (buf, sizeof (char), buflen, f_in); if (size < 0) { as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno)); size = 0; } return size; } /* Read a buffer from the input file. */ char * input_file_give_next_buffer (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_bad (_("can't read from %s: %s"), file_name, xstrerror (errno)); size = 0; } if (size) return_value = where + size; else { if (fclose (f_in)) as_warn (_("can't close %s: %s"), file_name, xstrerror (errno)); f_in = (FILE *) 0; return_value = 0; } return return_value; }
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