X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gas%2Finput-file.c;h=a864e4bdc812744b97d27c668ae47ab11726a74c;hb=a6dc81d2ab37bd09527e0a00d82c4670f22a1a27;hp=8e73615706783f1f297614cb3cb1c866f46e91a7;hpb=f24ddbddc5177a930b867626b12d2bb8b3757223;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/input-file.c b/gas/input-file.c index 8e73615706..a864e4bdc8 100644 --- a/gas/input-file.c +++ b/gas/input-file.c @@ -1,12 +1,13 @@ /* input_file.c - Deal with Input Files - - Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2003 + Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, + 2002, 2003, 2005, 2006, 2007, 2009, 2012 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) + 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, @@ -16,23 +17,18 @@ 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, 59 Temple Place - Suite 330, Boston, MA - 02111-1307, USA. */ + 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 -#include -#include #include "as.h" #include "input-file.h" #include "safe-ctype.h" -static int input_file_get PARAMS ((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; @@ -62,34 +58,28 @@ struct saved_file /* These hooks accommodate most operating systems. */ void -input_file_begin () +input_file_begin (void) { f_in = (FILE *) 0; } void -input_file_end () +input_file_end (void) { } /* Return BUFFER_SIZE. */ -unsigned int -input_file_buffer_size () +size_t +input_file_buffer_size (void) { 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 () +input_file_push (void) { register struct saved_file *saved; @@ -108,8 +98,7 @@ input_file_push () } void -input_file_pop (arg) - char *arg; +input_file_pop (char *arg) { register struct saved_file *saved = (struct saved_file *) arg; @@ -125,31 +114,17 @@ input_file_pop (arg) } void -input_file_open (filename, pre) - char *filename; /* "" means use stdin. Must not be 0. */ - int pre; +input_file_open (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. */ + gas_assert (filename != 0); /* Filename may not be NULL. */ if (filename[0]) { - struct stat statbuf; - - if (stat (filename, &statbuf) < 0) - { - as_bad (_("%s: No such file"), filename); - return; - } - else if (! S_ISREG (statbuf.st_mode)) - { - as_bad (_("'%s' is not an ordinary file"), filename); - return; - } - f_in = fopen (filename, FOPEN_RT); file_name = filename; } @@ -161,22 +136,42 @@ input_file_open (filename, pre) file_name = _("{standard input}"); } - if (f_in == (FILE *) 0) + if (f_in == NULL) { - as_bad (_("can't open %s for reading"), file_name); - as_perror ("%s", file_name); + 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; + } + + /* Check for an empty input file. */ + if (feof (f_in)) + { + fclose (f_in); + f_in = NULL; + return; + } + gas_assert (c != EOF); + if (c == '#') { /* Begins with comment, may not want to preprocess. */ c = getc (f_in); if (c == 'N') { - fgets (buf, 80, f_in); - if (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5])) + 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. */ @@ -185,8 +180,8 @@ input_file_open (filename, pre) } else if (c == 'A') { - fgets (buf, 80, f_in); - if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2])) + if (fgets (buf, sizeof (buf), f_in) + && !strncmp (buf, "PP", 2) && ISSPACE (buf[2])) preprocess = 1; if (!strchr (buf, '\n')) ungetc ('#', f_in); @@ -205,7 +200,7 @@ input_file_open (filename, pre) /* Close input file. */ void -input_file_close () +input_file_close (void) { /* Don't close a null file pointer. */ if (f_in != NULL) @@ -216,30 +211,27 @@ input_file_close () /* This function is passed to do_scrub_chars. */ -static int -input_file_get (buf, buflen) - char *buf; - int buflen; +static size_t +input_file_get (char *buf, size_t buflen) { - int size; + size_t size; + if (feof (f_in)) + return 0; + size = fread (buf, sizeof (char), buflen, f_in); - if (size < 0) - { - as_perror (_("Can't read from %s"), file_name); - size = 0; - } + if (ferror (f_in)) + as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno)); return size; } /* Read a buffer from the input file. */ char * -input_file_give_next_buffer (where) - char *where; /* Where to place 1st character of new buffer. */ +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; + size_t size; if (f_in == (FILE *) 0) return 0; @@ -250,18 +242,15 @@ input_file_give_next_buffer (where) 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_perror (_("Can't read from %s"), file_name); - size = 0; - } + size = input_file_get (where, BUFFER_SIZE); + if (size) return_value = where + size; else { if (fclose (f_in)) - as_perror (_("Can't close %s"), file_name); + as_warn (_("can't close %s: %s"), file_name, xstrerror (errno)); + f_in = (FILE *) 0; return_value = 0; }