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/* depend.c - Handle dependency tracking.
Copyright (C) 1997 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, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "as.h"
/* The file to write to, or NULL if no dependencies being kept. */
static char *dep_file = NULL;
struct dependency
{
char *file;
struct dependency *next;
};
/* All the files we depend on. */
static struct dependency *dep_chain = NULL;
/* Current column in output file. */
static int column = 0;
static void wrap_output PARAMS ((FILE *, char *, int));
/* Number of columns allowable. */
#define MAX_COLUMNS 72
/* Start saving dependencies, to be written to FILENAME. If this is
never called, then dependency tracking is simply skipped. */
void
start_dependencies (filename)
char *filename;
{
dep_file = filename;
}
/* Noticed a new filename, so try to register it. */
void
register_dependency (filename)
char *filename;
{
struct dependency *dep;
if (dep_file == NULL)
return;
for (dep = dep_chain; dep != NULL; dep = dep->next)
{
if (! strcmp (filename, dep->file))
return;
}
dep = (struct dependency *) xmalloc (sizeof (struct dependency));
dep->file = xstrdup (filename);
dep->next = dep_chain;
dep_chain = dep;
}
/* Append some output to the file, keeping track of columns and doing
wrapping as necessary. */
static void
wrap_output (f, string, spacer)
FILE *f;
char *string;
int spacer;
{
int len = strlen (string);
if (len == 0)
return;
if (column && MAX_COLUMNS - 1 /*spacer*/ - 2 /*` \'*/ < column + len)
{
fprintf (f, " \\\n ");
column = 0;
if (spacer == ' ')
spacer = '\0';
}
if (spacer == ' ')
{
putc (spacer, f);
++column;
}
fputs (string, f);
column += len;
if (spacer == ':')
{
putc (spacer, f);
++column;
}
}
/* Print dependency file. */
void
print_dependencies ()
{
FILE *f;
struct dependency *dep;
if (dep_file == NULL)
return;
f = fopen (dep_file, "w");
if (f == NULL)
{
as_warn ("Can't open `%s' for writing", dep_file);
return;
}
column = 0;
wrap_output (f, out_file_name, ':');
for (dep = dep_chain; dep != NULL; dep = dep->next)
wrap_output (f, dep->file, ' ');
putc ('\n', f);
if (fclose (f))
as_warn ("Can't close %s", dep_file);
}
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