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/* grep-dctrl - grep Debian control files
Copyright (C) 1999 Antti-Juhani Kaijanaho
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
The author can be reached via mail at (ISO 8859-1 charset for the city)
Antti-Juhani Kaijanaho
Helvintie 2 e as 9
FIN-40500 JYVSKYL
FINLAND
EUROPE
and via electronic mail from
gaia@iki.fi
If you have a choice, use the email address; it is more likely to
stay current.
*/
#include <assert.h>
#include <errno.h>
#include <publib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "msg.h"
#include "rc.h"
#include "strutil.h"
static char *
fnqualify_xalloc (const char * fname)
{
char * rv = 0;
size_t rv_len = 0;
int actual_len = 0;
while (actual_len >= rv_len)
{
rv = xrealloc (rv, rv_len += 64);
actual_len = fnqualify (rv, fname, rv_len);
}
return rv;
}
const char *
find_ifile_by_exename (const char * exename, const char * rcfname)
{
static const char * default_rcfiles [] = {
/* Order is significant: earlier files override later ones. */
"~/.grep-dctrlrc",
SYSCONF "/grep-dctrl.rc",
0 };
int i;
const char * rv = 0;
char * fname;
int lineno;
FILE * f;
assert (exename != 0);
if (rcfname == 0)
{
for (i = 0; rv == 0 && default_rcfiles [i] != 0; i++)
rv = find_ifile_by_exename (exename, default_rcfiles [i]);
return rv;
}
assert (rcfname != 0);
fname = fnqualify_xalloc (rcfname);
message (L_INFORMATIONAL, _("reading config file"), fname);
f = fopen (fname, "r");
if (f == 0)
{
message (L_INFORMATIONAL, strerror (errno), fname);
return 0;
}
lineno = 0;
while (1)
{
static char * line = 0;
char * line_exe;
char * line_ifile;
/* If this is not the first call, line may be non-null and must
be freed. It must be freed on all non-first iterations,
too. */
free (line);
line = xgetaline (f);
++lineno;
if (line == 0)
{
rv = 0;
break;
}
chop_comment (line, '#');
if (left_trimmed (line) [0] == 0)
continue;
line_exe = strtok (line, " \t");
if (line_exe == 0)
{
line_message (L_IMPORTANT, _("syntax error: need a executable name"),
fname, lineno);
continue;
}
line_ifile = strtok (0, " \t");
if (line_ifile == 0)
{
line_message (L_IMPORTANT,
_("syntax error: need an input file name"),
fname, lineno);
continue;
}
message (L_INFORMATIONAL, _("considering executable name"), line_exe);
if (strcmp (exename, line_exe) == 0)
{
message (L_INFORMATIONAL, _("yes, will use executable name"), line_exe);
rv = line_ifile;
message (L_INFORMATIONAL, _("default input file"), rv);
break;
}
}
fclose (f);
free (fname);
return rv;
}
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