usr/src/usr.bin/man/config.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)config.c    5.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "pathnames.h"

extern char *progname;

/*
 * config --
 *      read in the configuration file, convert it to a colon separated
 *      path.
 */
char *
config()
{
        register char *p;
        u_int buflen;
        int len;
        char *buf, *endp, line[256], *realloc();

        if (!freopen(_PATH_MANCONF, "r", stdin)) {
                (void)fprintf(stderr, "%s: no configuration file %s.\n",
                    progname, _PATH_MANCONF);
                exit(1);
        }
        buflen = 0;
        buf = endp = p = NULL;
        while (fgets(line, sizeof(line), stdin)) {
                if (!index(line, '\n')) {
                        (void)fprintf(stderr, "%s: config line too long.\n",
                            progname);
                        exit(1);
                }
                len = strcspn(line, " \t\n");
                if (!len || *line == '#')
                        continue;
                if (!p || p + len + 2 >= endp) {
                        if (!(buf = realloc(buf, buflen += 1024)))
                                enomem();
                        if (!p)
                                p = buf;
                        endp = buf + buflen;
                }
                bcopy(line, p, len);
                p += len;
                *p++ = ':';
        }
        if (!buf)
                return((char *)NULL);
        *--p = '\0';
        return(buf);
}

enomem()
{
        extern int errno;
        char *strerror();

        (void)fprintf(stderr, "%s: %s\n", strerror(ENOMEM), progname);
        exit(1);
}