144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
/* 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);
|
||
}
|