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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gas/] [depend.c] - Blame information for rev 438

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1 205 julius
/* depend.c - Handle dependency tracking.
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   Copyright 1997, 1998, 2000, 2001, 2003, 2004, 2005, 2007
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   Free Software Foundation, Inc.
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   This file is part of GAS, the GNU Assembler.
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   GAS is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   GAS is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GAS; see the file COPYING.  If not, write to the Free
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   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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   02110-1301, USA.  */
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#include "as.h"
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/* The file to write to, or NULL if no dependencies being kept.  */
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static char * dep_file = NULL;
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struct dependency
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  {
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    char * file;
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    struct dependency * next;
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  };
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/* All the files we depend on.  */
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static struct dependency * dep_chain = NULL;
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/* Current column in output file.  */
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static int column = 0;
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static int quote_string_for_make (FILE *, char *);
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static void wrap_output (FILE *, char *, int);
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/* Number of columns allowable.  */
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#define MAX_COLUMNS 72
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/* Start saving dependencies, to be written to FILENAME.  If this is
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   never called, then dependency tracking is simply skipped.  */
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void
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start_dependencies (char *filename)
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{
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  dep_file = filename;
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}
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/* Noticed a new filename, so try to register it.  */
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void
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register_dependency (char *filename)
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{
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  struct dependency *dep;
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  if (dep_file == NULL)
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    return;
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  for (dep = dep_chain; dep != NULL; dep = dep->next)
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    {
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      if (!strcmp (filename, dep->file))
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        return;
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    }
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  dep = (struct dependency *) xmalloc (sizeof (struct dependency));
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  dep->file = xstrdup (filename);
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  dep->next = dep_chain;
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  dep_chain = dep;
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}
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/* Quote a file name the way `make' wants it, and print it to FILE.
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   If FILE is NULL, do no printing, but return the length of the
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   quoted string.
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   This code is taken from gcc with only minor changes.  */
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static int
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quote_string_for_make (FILE *file, char *src)
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{
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  char *p = src;
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  int i = 0;
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  for (;;)
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    {
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      char c = *p++;
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      switch (c)
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        {
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        case '\0':
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        case ' ':
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        case '\t':
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          {
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            /* GNU make uses a weird quoting scheme for white space.
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               A space or tab preceded by 2N+1 backslashes represents
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               N backslashes followed by space; a space or tab
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               preceded by 2N backslashes represents N backslashes at
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               the end of a file name; and backslashes in other
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               contexts should not be doubled.  */
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            char *q;
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            for (q = p - 1; src < q && q[-1] == '\\'; q--)
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              {
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                if (file)
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                  putc ('\\', file);
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                i++;
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              }
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          }
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          if (!c)
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            return i;
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          if (file)
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            putc ('\\', file);
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          i++;
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          goto ordinary_char;
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        case '$':
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          if (file)
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            putc (c, file);
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          i++;
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          /* Fall through.  This can mishandle things like "$(" but
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             there's no easy fix.  */
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        default:
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        ordinary_char:
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          /* This can mishandle characters in the string "\0\n%*?[\\~";
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             exactly which chars are mishandled depends on the `make' version.
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             We know of no portable solution for this;
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             even GNU make 3.76.1 doesn't solve the problem entirely.
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             (Also, '\0' is mishandled due to our calling conventions.)  */
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          if (file)
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            putc (c, file);
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          i++;
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          break;
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        }
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    }
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}
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/* Append some output to the file, keeping track of columns and doing
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   wrapping as necessary.  */
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static void
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wrap_output (FILE *f, char *string, int spacer)
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{
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  int len = quote_string_for_make (NULL, string);
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  if (len == 0)
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    return;
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  if (column
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      && (MAX_COLUMNS
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          - 1 /* spacer */
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          - 2 /* ` \'   */
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          < column + len))
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    {
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      fprintf (f, " \\\n ");
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      column = 0;
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      if (spacer == ' ')
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        spacer = '\0';
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    }
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  if (spacer == ' ')
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    {
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      putc (spacer, f);
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      ++column;
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    }
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  quote_string_for_make (f, string);
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  column += len;
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  if (spacer == ':')
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    {
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      putc (spacer, f);
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      ++column;
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    }
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}
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/* Print dependency file.  */
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void
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print_dependencies (void)
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{
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  FILE *f;
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  struct dependency *dep;
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  if (dep_file == NULL)
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    return;
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  f = fopen (dep_file, FOPEN_WT);
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  if (f == NULL)
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    {
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      as_warn (_("can't open `%s' for writing"), dep_file);
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      return;
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    }
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  column = 0;
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  wrap_output (f, out_file_name, ':');
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  for (dep = dep_chain; dep != NULL; dep = dep->next)
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    wrap_output (f, dep->file, ' ');
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  putc ('\n', f);
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  if (fclose (f))
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    as_warn (_("can't close `%s'"), dep_file);
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}

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