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[apache] / server / util.c

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

/*
 * util.c: string utility things
 * 
 * 3/21/93 Rob McCool
 * 1995-96 Many changes by the Apache Software Foundation
 * 
 */

/* Debugging aid:
 * #define DEBUG            to trace all cfg_open*()/cfg_closefile() calls
 * #define DEBUG_CFG_LINES  to trace every line read from the config files
 */

#define CORE_PRIVATE

#include "ap_config.h"
#include "ap_base64.h"
#include "apr_strings.h"
#include "httpd.h"
#include "http_main.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_config.h"
#include "util_ebcdic.h"

#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

/* A bunch of functions in util.c scan strings looking for certain characters.
 * To make that more efficient we encode a lookup table.  The test_char_table
 * is generated automatically by gen_test_char.c.
 */
#include "test_char.h"

/* we assume the folks using this ensure 0 <= c < 256... which means
 * you need a cast to (unsigned char) first, you can't just plug a
 * char in here and get it to work, because if char is signed then it
 * will first be sign extended.
 */
#define TEST_CHAR(c, f) (test_char_table[(unsigned)(c)] & (f))

/*
 * Examine a field value (such as a media-/content-type) string and return
 * it sans any parameters; e.g., strip off any ';charset=foo' and the like.
 */
AP_DECLARE(char *) ap_field_noparam(apr_pool_t *p, const char *intype)
{
    const char *semi;

    if (intype == NULL) return NULL;

    semi = ap_strchr_c(intype, ';');
    if (semi == NULL) {
        return apr_pstrdup(p, intype);
    } 
    else {
        while ((semi > intype) && apr_isspace(semi[-1])) {
            semi--;
        }
        return apr_pstrndup(p, intype, semi - intype);
    }
}

AP_DECLARE(char *) ap_ht_time(apr_pool_t *p, apr_time_t t, const char *fmt, int gmt)
{
    apr_size_t retcode;
    char ts[MAX_STRING_LEN];
    char tf[MAX_STRING_LEN];
    apr_exploded_time_t xt;

    if (gmt) {
        const char *f;
        char *strp;

        apr_explode_gmt(&xt, t);
        /* Convert %Z to "GMT" and %z to "+0000";
         * on hosts that do not have a time zone string in struct tm,
         * strftime must assume its argument is local time.
         */
        for(strp = tf, f = fmt; strp < tf + sizeof(tf) - 6 && (*strp = *f)
            ; f++, strp++) {
            if (*f != '%') continue;
            switch (f[1]) {
            case '%':
                *++strp = *++f;
                break;
            case 'Z':
                *strp++ = 'G';
                *strp++ = 'M';
                *strp = 'T';
                f++;
                break;
            case 'z': /* common extension */
                *strp++ = '+';
                *strp++ = '0';
                *strp++ = '0';
                *strp++ = '0';
                *strp = '0';
                f++;
                break;
            }
        }
        *strp = '\0';
        fmt = tf;
    }
    else {
        apr_explode_localtime(&xt, t);
    }

    /* check return code? */
    apr_strftime(ts, &retcode, MAX_STRING_LEN, fmt, &xt);
    ts[MAX_STRING_LEN - 1] = '\0';
    return apr_pstrdup(p, ts);
}

/* Roy owes Rob beer. */
/* Rob owes Roy dinner. */

/* These legacy comments would make a lot more sense if Roy hadn't
 * replaced the old later_than() routine with util_date.c.
 *
 * Well, okay, they still wouldn't make any sense.
 */

/* Match = 0, NoMatch = 1, Abort = -1
 * Based loosely on sections of wildmat.c by Rich Salz
 * Hmmm... shouldn't this really go component by component?
 */
AP_DECLARE(int) ap_strcmp_match(const char *str, const char *exp)
{
    int x, y;

    for (x = 0, y = 0; exp[y]; ++y, ++x) {
        if ((!str[x]) && (exp[y] != '*'))
            return -1;
        if (exp[y] == '*') {
            while (exp[++y] == '*');
            if (!exp[y])
                return 0;
            while (str[x]) {
                int ret;
                if ((ret = ap_strcmp_match(&str[x++], &exp[y])) != 1)
                    return ret;
            }
            return -1;
        }
        else if ((exp[y] != '?') && (str[x] != exp[y]))
            return 1;
    }
    return (str[x] != '\0');
}

AP_DECLARE(int) ap_strcasecmp_match(const char *str, const char *exp)
{
    int x, y;

    for (x = 0, y = 0; exp[y]; ++y, ++x) {
        if ((!str[x]) && (exp[y] != '*'))
            return -1;
        if (exp[y] == '*') {
            while (exp[++y] == '*');
            if (!exp[y])
                return 0;
            while (str[x]) {
                int ret;
                if ((ret = ap_strcasecmp_match(&str[x++], &exp[y])) != 1)
                    return ret;
            }
            return -1;
        }
        else if ((exp[y] != '?') && (apr_tolower(str[x]) != apr_tolower(exp[y])))
            return 1;
    }
    return (str[x] != '\0');
}

AP_DECLARE(int) ap_is_matchexp(const char *str)
{
    register int x;

    for (x = 0; str[x]; x++)
        if ((str[x] == '*') || (str[x] == '?'))
            return 1;
    return 0;
}

/*
 * Here's a pool-based interface to POSIX regex's regcomp().
 * Note that we return regex_t instead of being passed one.
 * The reason is that if you use an already-used regex_t structure,
 * the memory that you've already allocated gets forgotten, and
 * regfree() doesn't clear it. So we don't allow it.
 */

static apr_status_t regex_cleanup(void *preg)
{
    regfree((regex_t *) preg);
    return APR_SUCCESS;
}

AP_DECLARE(regex_t *) ap_pregcomp(apr_pool_t *p, const char *pattern,
                                   int cflags)
{
    regex_t *preg = apr_palloc(p, sizeof(regex_t));

    if (regcomp(preg, pattern, cflags)) {
        return NULL;
    }

    apr_register_cleanup(p, (void *) preg, regex_cleanup, regex_cleanup);

    return preg;
}

AP_DECLARE(void) ap_pregfree(apr_pool_t *p, regex_t * reg)
{
    regfree(reg);
    apr_kill_cleanup(p, (void *) reg, regex_cleanup);
}

/*
 * Similar to standard strstr() but we ignore case in this version.
 * Based on the strstr() implementation further below.
 */
AP_DECLARE(char *) ap_strcasestr(const char *s1, const char *s2)
{
    char *p1, *p2;
    if (*s2 == '\0') {
        /* an empty s2 */
        return((char *)s1);
    }
    while(1) {
        for ( ; (*s1 != '\0') && (apr_tolower(*s1) != apr_tolower(*s2)); s1++);
        if (*s1 == '\0') return(NULL);
        /* found first character of s2, see if the rest matches */
        p1 = (char *)s1;
        p2 = (char *)s2;
        while (apr_tolower(*++p1) == apr_tolower(*++p2)) {
            if (*p1 == '\0') {
                /* both strings ended together */
                return((char *)s1);
            }
        }
        if (*p2 == '\0') {
            /* second string ended, a match */
            break;
        }
        /* didn't find a match here, try starting at next character in s1 */
        s1++;
    }
    return((char *)s1);
}

/*
 * Returns an offsetted pointer in bigstring immediately after
 * prefix. Returns bigstring if bigstring doesn't start with
 * prefix or if prefix is longer than bigstring while still matching.
 * NOTE: pointer returned is relative to bigstring, so we
 * can use standard pointer comparisons in the calling function
 * (eg: test if ap_stripprefix(a,b) == a)
 */
AP_DECLARE(const char *) ap_stripprefix(const char *bigstring,
                                        const char *prefix)
{
    const char *p1;

    if (*prefix == '\0')
        return bigstring;

    p1 = bigstring;
    while (*p1 && *prefix) {
        if (*p1++ != *prefix++)
            return bigstring;
    }
    if (*prefix == '\0')
        return p1;

    /* hit the end of bigstring! */
    return bigstring;
}

/* 
 * Apache stub function for the regex libraries regexec() to make sure the
 * whole regex(3) API is available through the Apache (exported) namespace.
 * This is especially important for the DSO situations of modules.
 * DO NOT MAKE A MACRO OUT OF THIS FUNCTION!
 */
AP_DECLARE(int) ap_regexec(regex_t *preg, const char *string,
                           size_t nmatch, regmatch_t pmatch[], int eflags)
{
    return regexec(preg, string, nmatch, pmatch, eflags);
}

AP_DECLARE(size_t) ap_regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
{
    return regerror(errcode, preg, errbuf, errbuf_size);
}


/* This function substitutes for $0-$9, filling in regular expression
 * submatches. Pass it the same nmatch and pmatch arguments that you
 * passed ap_regexec(). pmatch should not be greater than the maximum number
 * of subexpressions - i.e. one more than the re_nsub member of regex_t.
 *
 * input should be the string with the $-expressions, source should be the
 * string that was matched against.
 *
 * It returns the substituted string, or NULL on error.
 *
 * Parts of this code are based on Henry Spencer's regsub(), from his
 * AT&T V8 regexp package.
 */

AP_DECLARE(char *) ap_pregsub(apr_pool_t *p, const char *input, const char *source,
                           size_t nmatch, regmatch_t pmatch[])
{
    const char *src = input;
    char *dest, *dst;
    char c;
    size_t no;
    int len;

    if (!source)
        return NULL;
    if (!nmatch)
        return apr_pstrdup(p, src);

    /* First pass, find the size */

    len = 0;

    while ((c = *src++) != '\0') {
        if (c == '&')
            no = 0;
        else if (c == '$' && apr_isdigit(*src))
            no = *src++ - '0';
        else
            no = 10;

        if (no > 9) {           /* Ordinary character. */
            if (c == '\\' && (*src == '$' || *src == '&'))
                c = *src++;
            len++;
        }
        else if (no < nmatch && pmatch[no].rm_so < pmatch[no].rm_eo) {
            len += pmatch[no].rm_eo - pmatch[no].rm_so;
        }

    }

    dest = dst = apr_pcalloc(p, len + 1);

    /* Now actually fill in the string */

    src = input;

    while ((c = *src++) != '\0') {
        if (c == '&')
            no = 0;
        else if (c == '$' && apr_isdigit(*src))
            no = *src++ - '0';
        else
            no = 10;

        if (no > 9) {           /* Ordinary character. */
            if (c == '\\' && (*src == '$' || *src == '&'))
                c = *src++;
            *dst++ = c;
        }
        else if (no < nmatch && pmatch[no].rm_so < pmatch[no].rm_eo) {
            len = pmatch[no].rm_eo - pmatch[no].rm_so;
            memcpy(dst, source + pmatch[no].rm_so, len);
            dst += len;
        }

    }
    *dst = '\0';

    return dest;
}

/*
 * Parse .. so we don't compromise security
 */
AP_DECLARE(void) ap_getparents(char *name)
{
    int l, w;

    /* Four paseses, as per RFC 1808 */
    /* a) remove ./ path segments */

    for (l = 0, w = 0; name[l] != '\0';) {
        if (name[l] == '.' && name[l + 1] == '/' && (l == 0 || name[l - 1] == '/'))
            l += 2;
        else
            name[w++] = name[l++];
    }

    /* b) remove trailing . path, segment */
    if (w == 1 && name[0] == '.')
        w--;
    else if (w > 1 && name[w - 1] == '.' && name[w - 2] == '/')
        w--;
    name[w] = '\0';

    /* c) remove all xx/../ segments. (including leading ../ and /../) */
    l = 0;

    while (name[l] != '\0') {
        if (name[l] == '.' && name[l + 1] == '.' && name[l + 2] == '/' &&
            (l == 0 || name[l - 1] == '/')) {
            register int m = l + 3, n;

            l = l - 2;
            if (l >= 0) {
                while (l >= 0 && name[l] != '/')
                    l--;
                l++;
            }
            else
                l = 0;
            n = l;
            while ((name[n] = name[m]))
                (++n, ++m);
        }
        else
            ++l;
    }

    /* d) remove trailing xx/.. segment. */
    if (l == 2 && name[0] == '.' && name[1] == '.')
        name[0] = '\0';
    else if (l > 2 && name[l - 1] == '.' && name[l - 2] == '.' && name[l - 3] == '/') {
        l = l - 4;
        if (l >= 0) {
            while (l >= 0 && name[l] != '/')
                l--;
            l++;
        }
        else
            l = 0;
        name[l] = '\0';
    }
}

AP_DECLARE(void) ap_no2slash(char *name)
{
    char *d, *s;

    s = d = name;

#ifdef HAVE_UNC_PATHS
    /* Check for UNC names.  Leave leading two slashes. */
    if (s[0] == '/' && s[1] == '/')
        *d++ = *s++;
#endif

    while (*s) {
        if ((*d++ = *s) == '/') {
            do {
                ++s;
            } while (*s == '/');
        }
        else {
            ++s;
        }
    }
    *d = '\0';
}


/*
 * copy at most n leading directories of s into d
 * d should be at least as large as s plus 1 extra byte
 * assumes n > 0
 * the return value is the ever useful pointer to the trailing \0 of d
 *
 * MODIFIED FOR HAVE_DRIVE_LETTERS and NETWARE environments, 
 * so that if n == 0, "/" is returned in d with n == 1 
 * and s == "e:/test.html", "e:/" is returned in d
 * *** See also directory_walk in src/main/http_request.c

 * examples:
 *    /a/b, 0  ==> /  (true for all platforms)
 *    /a/b, 1  ==> /
 *    /a/b, 2  ==> /a/
 *    /a/b, 3  ==> /a/b/
 *    /a/b, 4  ==> /a/b/
 *
 *    c:/a/b 0 ==> /
 *    c:/a/b 1 ==> c:/
 *    c:/a/b 2 ==> c:/a/
 *    c:/a/b 3 ==> c:/a/b
 *    c:/a/b 4 ==> c:/a/b
 */
AP_DECLARE(char *) ap_make_dirstr_prefix(char *d, const char *s, int n)
{
    if (n < 1) {
        *d = '/';
        *++d = '\0';
        return (d);
    }

    for (;;) {
        if (*s == '\0' || (*s == '/' && (--n) == 0)) {
            *d = '/';
            break;
        }
        *d++ = *s++;
    }
    *++d = 0;
    return (d);
}


/*
 * return the parent directory name including trailing / of the file s
 */
AP_DECLARE(char *) ap_make_dirstr_parent(apr_pool_t *p, const char *s)
{
    const char *last_slash = ap_strrchr_c(s, '/');
    char *d;
    int l;

    if (last_slash == NULL) {
        /* XXX: well this is really broken if this happens */
        return (apr_pstrdup(p, "/"));
    }
    l = (last_slash - s) + 1;
    d = apr_palloc(p, l + 1);
    memcpy(d, s, l);
    d[l] = 0;
    return (d);
}


AP_DECLARE(int) ap_count_dirs(const char *path)
{
    register int x, n;

    for (x = 0, n = 0; path[x]; x++)
        if (path[x] == '/')
            n++;
    return n;
}


AP_DECLARE(void) ap_chdir_file(const char *file)
{
    const char *x;
    char buf[HUGE_STRING_LEN];

    x = ap_strrchr_c(file, '/');
    if (x == NULL) {
        chdir(file);
    }
    else if (x - file < sizeof(buf) - 1) {
        memcpy(buf, file, x - file);
        buf[x - file] = '\0';
        chdir(buf);
    }
    /* XXX: well, this is a silly function, no method of reporting an
     * error... ah well. */
}

AP_DECLARE(char *) ap_getword_nc(apr_pool_t *atrans, char **line, char stop)
{
    return ap_getword(atrans, (const char **) line, stop);
}

AP_DECLARE(char *) ap_getword(apr_pool_t *atrans, const char **line, char stop)
{
    const char *pos = ap_strchr_c(*line, stop);
    char *res;

    if (!pos) {
        res = apr_pstrdup(atrans, *line);
        *line += strlen(*line);
        return res;
    }

    res = apr_pstrndup(atrans, *line, pos - *line);

    while (*pos == stop) {
        ++pos;
    }

    *line = pos;

    return res;
}

AP_DECLARE(char *) ap_getword_white_nc(apr_pool_t *atrans, char **line)
{
    return ap_getword_white(atrans, (const char **) line);
}

AP_DECLARE(char *) ap_getword_white(apr_pool_t *atrans, const char **line)
{
    int pos = -1, x;
    char *res;

    for (x = 0; (*line)[x]; x++) {
        if (apr_isspace((*line)[x])) {
            pos = x;
            break;
        }
    }

    if (pos == -1) {
        res = apr_pstrdup(atrans, *line);
        *line += strlen(*line);
        return res;
    }

    res = apr_palloc(atrans, pos + 1);
    apr_cpystrn(res, *line, pos + 1);

    while (apr_isspace((*line)[pos]))
        ++pos;

    *line += pos;

    return res;
}

AP_DECLARE(char *) ap_getword_nulls_nc(apr_pool_t *atrans, char **line, char stop)
{
    return ap_getword_nulls(atrans, (const char **) line, stop);
}

AP_DECLARE(char *) ap_getword_nulls(apr_pool_t *atrans, const char **line, char stop)
{
    const char *pos = ap_strchr_c(*line, stop);
    char *res;

    if (!pos) {
        res = apr_pstrdup(atrans, *line);
        *line += strlen(*line);
        return res;
    }

    res = apr_pstrndup(atrans, *line, pos - *line);

    ++pos;

    *line = pos;

    return res;
}

/* Get a word, (new) config-file style --- quoted strings and backslashes
 * all honored
 */

static char *substring_conf(apr_pool_t *p, const char *start, int len, char quote)
{
    char *result = apr_palloc(p, len + 2);
    char *resp = result;
    int i;

    for (i = 0; i < len; ++i) {
        if (start[i] == '\\' && (start[i + 1] == '\\'
                                 || (quote && start[i + 1] == quote)))
            *resp++ = start[++i];
        else
            *resp++ = start[i];
    }

    *resp++ = '\0';
#if RESOLVE_ENV_PER_TOKEN
    return ap_resolve_env(p,result);
#else
    return result;
#endif
}

AP_DECLARE(char *) ap_getword_conf_nc(apr_pool_t *p, char **line)
{
    return ap_getword_conf(p, (const char **) line);
}

AP_DECLARE(char *) ap_getword_conf(apr_pool_t *p, const char **line)
{
    const char *str = *line, *strend;
    char *res;
    char quote;

    while (*str && apr_isspace(*str))
        ++str;

    if (!*str) {
        *line = str;
        return "";
    }

    if ((quote = *str) == '"' || quote == '\'') {
        strend = str + 1;
        while (*strend && *strend != quote) {
            if (*strend == '\\' && strend[1] && strend[1] == quote)
                strend += 2;
            else
                ++strend;
        }
        res = substring_conf(p, str + 1, strend - str - 1, quote);

        if (*strend == quote)
            ++strend;
    }
    else {
        strend = str;
        while (*strend && !apr_isspace(*strend))
            ++strend;

        res = substring_conf(p, str, strend - str, 0);
    }

    while (*strend && apr_isspace(*strend))
        ++strend;
    *line = strend;
    return res;
}

/* Check a string for any ${ENV} environment variable
 * construct and replace each them by the value of
 * that environment variable, if it exists. If the
 * environment value does not exist, leave the ${ENV}
 * construct alone; it means something else.
 */
AP_DECLARE(const char *) ap_resolve_env(apr_pool_t *p, const char * word)
{
       char tmp[ MAX_STRING_LEN ];
       const char *s, *e;
       tmp[0] = '\0';

       if (!(s=ap_strchr_c(word,'$')))
               return word;

       do {
               /* XXX - relies on strncat() to add '\0'
                */
               strncat(tmp,word,s - word);
               if ((s[1] == '{') && (e=ap_strchr_c(s,'}'))) {
                       const char *e2 = e;
                       word = e + 1;
                       e = getenv(s+2);
                       if (e) {
                           strcat(tmp,e);
                       } else {
                           strncat(tmp, s, e2-s);
                           strcat(tmp,"}");
                       }
               } else {
                       /* ignore invalid strings */
                       word = s+1;
                       strcat(tmp,"$");
               };
       } while ((s=ap_strchr_c(word,'$')));
       strcat(tmp,word);

       return apr_pstrdup(p,tmp);
}
AP_DECLARE(int) ap_cfg_closefile(configfile_t *cfp)
{
#ifdef DEBUG
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL, 
        "Done with config file %s", cfp->name);
#endif
    return (cfp->close == NULL) ? 0 : cfp->close(cfp->param);
}

static apr_status_t cfg_close(void *param)
{
    apr_file_t *cfp = (apr_file_t *) param;
    return (apr_close(cfp));
}

static int cfg_getch(void *param)
{
    char ch;
    apr_file_t *cfp = (apr_file_t *) param;
    if (apr_getc(&ch, cfp) == APR_SUCCESS)
        return ch;
    return (int)EOF;
}

static void *cfg_getstr(void *buf, size_t bufsiz, void *param)
{
    apr_file_t *cfp = (apr_file_t *) param;
    apr_status_t rv;
    rv = apr_fgets(buf, bufsiz, cfp);
    if (rv == APR_SUCCESS || (rv == APR_EOF && strcmp(buf, "")))
        return buf;
    return NULL;
}

/* Open a configfile_t as FILE, return open configfile_t struct pointer */
AP_DECLARE(apr_status_t) ap_pcfg_openfile(configfile_t **ret_cfg, apr_pool_t *p, const char *name)
{
    configfile_t *new_cfg;
    apr_file_t *file = NULL;
    apr_finfo_t finfo;
    apr_status_t status;
#ifdef DEBUG
    char buf[120];
#endif

    if (name == NULL) {
        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0, NULL,
               "Internal error: pcfg_openfile() called with NULL filename");
        return APR_EBADF;
    }

    if (!ap_os_is_filename_valid(name)) {
        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0, NULL,
                    "Access to config file %s denied: not a valid filename",
                    name);
        return APR_EACCES;
    }

    status = apr_open(&file, name, APR_READ | APR_BUFFERED, APR_OS_DEFAULT, p);
#ifdef DEBUG
    ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, NULL,
                "Opening config file %s (%s)",
                name, (status != APR_SUCCESS) ? 
                apr_strerror(status, buf, sizeof(buf)) : "successful");
#endif
    if (status != APR_SUCCESS)
        return status;

    status = apr_getfileinfo(&finfo, file);
    if (status != APR_SUCCESS)
        return status;

    if (finfo.filetype != APR_REG &&
#if defined(WIN32) || defined(OS2)
        !(strcasecmp(name, "nul") == 0 ||
          (strlen(name) >= 4 &&
           strcasecmp(name + strlen(name) - 4, "/nul") == 0))) {
#else
        strcmp(name, "/dev/null") != 0) {
#endif /* WIN32 || OS2 */
        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0, NULL,
                    "Access to file %s denied by server: not a regular file",
                    name);
        apr_close(file);
        return APR_EBADF;
    }

    new_cfg = apr_palloc(p, sizeof(*new_cfg));
    new_cfg->param = file;
    new_cfg->name = apr_pstrdup(p, name);
    new_cfg->getch = (int (*)(void *)) cfg_getch;
    new_cfg->getstr = (void *(*)(void *, size_t, void *)) cfg_getstr;
    new_cfg->close = (int (*)(void *)) cfg_close;
    new_cfg->line_number = 0;
    *ret_cfg = new_cfg;
    return APR_SUCCESS;
}


/* Allocate a configfile_t handle with user defined functions and params */
AP_DECLARE(configfile_t *) ap_pcfg_open_custom(apr_pool_t *p, const char *descr,
    void *param,
    int(*getch)(void *param),
    void *(*getstr) (void *buf, size_t bufsiz, void *param),
    int(*close_func)(void *param))
{
    configfile_t *new_cfg = apr_palloc(p, sizeof(*new_cfg));
#ifdef DEBUG
    ap_log_error(APLOG_MARK, APLOG_DEBUG | APLOG_NOERRNO, 0, NULL, "Opening config handler %s", descr);
#endif
    new_cfg->param = param;
    new_cfg->name = descr;
    new_cfg->getch = getch;
    new_cfg->getstr = getstr;
    new_cfg->close = close_func;
    new_cfg->line_number = 0;
    return new_cfg;
}


/* Read one character from a configfile_t */
AP_DECLARE(int) ap_cfg_getc(configfile_t *cfp)
{
    register int ch = cfp->getch(cfp->param);
    if (ch == LF) 
        ++cfp->line_number;
    return ch;
}


/* Read one line from open configfile_t, strip LF, increase line number */
/* If custom handler does not define a getstr() function, read char by char */
AP_DECLARE(int) ap_cfg_getline(char *buf, size_t bufsize, configfile_t *cfp)
{
    /* If a "get string" function is defined, use it */
    if (cfp->getstr != NULL) {
        char *src, *dst;
        char *cp;
        char *cbuf = buf;
        size_t cbufsize = bufsize;

        while (1) {
            ++cfp->line_number;
            if (cfp->getstr(cbuf, cbufsize, cfp->param) == NULL)
                return 1;

            /*
             *  check for line continuation,
             *  i.e. match [^\\]\\[\r]\n only
             */
            cp = cbuf;
            while (cp < cbuf+cbufsize && *cp != '\0')
                cp++;
            if (cp > cbuf && cp[-1] == LF) {
                cp--;
                if (cp > cbuf && cp[-1] == CR)
                    cp--;
                if (cp > cbuf && cp[-1] == '\\') {
                    cp--;
                    if (!(cp > cbuf && cp[-1] == '\\')) {
                        /*
                         * line continuation requested -
                         * then remove backslash and continue
                         */
                        cbufsize -= (cp-cbuf);
                        cbuf = cp;
                        continue;
                    }
                    else {
                        /* 
                         * no real continuation because escaped -
                         * then just remove escape character
                         */
                        for ( ; cp < cbuf+cbufsize && *cp != '\0'; cp++)
                            cp[0] = cp[1];
                    }   
                }
            }
            break;
        }

        /*
         * Leading and trailing white space is eliminated completely
         */
        src = buf;
        while (apr_isspace(*src))
            ++src;
        /* blast trailing whitespace */
        dst = &src[strlen(src)];
        while (--dst >= src && apr_isspace(*dst))
            *dst = '\0';
        /* Zap leading whitespace by shifting */
        if (src != buf)
            for (dst = buf; (*dst++ = *src++) != '\0'; )
                ;

#ifdef DEBUG_CFG_LINES
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL, "Read config: %s", buf);
#endif
        return 0;
    } else {
        /* No "get string" function defined; read character by character */
        register int c;
        register size_t i = 0;

        buf[0] = '\0';
        /* skip leading whitespace */
        do {
            c = cfp->getch(cfp->param);
        } while (c == '\t' || c == ' ');

        if (c == EOF)
            return 1;
        
        if(bufsize < 2) {
            /* too small, assume caller is crazy */
            return 1;
        }

        while (1) {
            if ((c == '\t') || (c == ' ')) {
                buf[i++] = ' ';
                while ((c == '\t') || (c == ' '))
                    c = cfp->getch(cfp->param);
            }
            if (c == CR) {
                /* silently ignore CR (_assume_ that a LF follows) */
                c = cfp->getch(cfp->param);
            }
            if (c == LF) {
                /* increase line number and return on LF */
                ++cfp->line_number;
            }
            if (c == EOF || c == 0x4 || c == LF || i >= (bufsize - 2)) {
                /* 
                 *  check for line continuation
                 */
                if (i > 0 && buf[i-1] == '\\') {
                    i--;
                    if (!(i > 0 && buf[i-1] == '\\')) {
                        /* line is continued */
                        c = cfp->getch(cfp->param);
                        continue;
                    }
                    /* else nothing needs be done because
                     * then the backslash is escaped and
                     * we just strip to a single one
                     */
                }
                /* blast trailing whitespace */
                while (i > 0 && apr_isspace(buf[i - 1]))
                    --i;
                buf[i] = '\0';
#ifdef DEBUG_CFG_LINES
                ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL, "Read config: %s", buf);
#endif
                return 0;
            }
            buf[i] = c;
            ++i;
            c = cfp->getch(cfp->param);
        }
    }
}

/* Size an HTTP header field list item, as separated by a comma.
 * The return value is a pointer to the beginning of the non-empty list item
 * within the original string (or NULL if there is none) and the address
 * of field is shifted to the next non-comma, non-whitespace character.
 * len is the length of the item excluding any beginning whitespace.
 */
AP_DECLARE(const char *) ap_size_list_item(const char **field, int *len)
{
    const unsigned char *ptr = (const unsigned char *)*field;
    const unsigned char *token;
    int in_qpair, in_qstr, in_com;

    /* Find first non-comma, non-whitespace byte */

    while (*ptr == ',' || apr_isspace(*ptr))
        ++ptr;

    token = ptr;

    /* Find the end of this item, skipping over dead bits */

    for (in_qpair = in_qstr = in_com = 0;
         *ptr && (in_qpair || in_qstr || in_com || *ptr != ',');
         ++ptr) {

        if (in_qpair) {
            in_qpair = 0;
        }
        else {
            switch (*ptr) {
                case '\\': in_qpair = 1;      /* quoted-pair         */
                           break;
                case '"' : if (!in_com)       /* quoted string delim */
                               in_qstr = !in_qstr;
                           break;
                case '(' : if (!in_qstr)      /* comment (may nest)  */
                               ++in_com;
                           break;
                case ')' : if (in_com)        /* end comment         */
                               --in_com;
                           break;
                default  : break;
            }
        }
    }

    if ((*len = (ptr - token)) == 0) {
        *field = (const char *)ptr;
        return NULL;
    }

    /* Advance field pointer to the next non-comma, non-white byte */

    while (*ptr == ',' || apr_isspace(*ptr))
        ++ptr;

    *field = (const char *)ptr;
    return (const char *)token;
}

/* Retrieve an HTTP header field list item, as separated by a comma,
 * while stripping insignificant whitespace and lowercasing anything not in
 * a quoted string or comment.  The return value is a new string containing
 * the converted list item (or NULL if none) and the address pointed to by
 * field is shifted to the next non-comma, non-whitespace.
 */
AP_DECLARE(char *) ap_get_list_item(apr_pool_t *p, const char **field)
{
    const char *tok_start;
    const unsigned char *ptr;
    unsigned char *pos;
    char *token;
    int addspace = 0, in_qpair = 0, in_qstr = 0, in_com = 0, tok_len = 0;

    /* Find the beginning and maximum length of the list item so that
     * we can allocate a buffer for the new string and reset the field.
     */
    if ((tok_start = ap_size_list_item(field, &tok_len)) == NULL) {
        return NULL;
    }
    token = apr_palloc(p, tok_len + 1);

    /* Scan the token again, but this time copy only the good bytes.
     * We skip extra whitespace and any whitespace around a '=', '/',
     * or ';' and lowercase normal characters not within a comment,
     * quoted-string or quoted-pair.
     */
    for (ptr = (const unsigned char *)tok_start, pos = (unsigned char *)token;
         *ptr && (in_qpair || in_qstr || in_com || *ptr != ',');
         ++ptr) {

        if (in_qpair) {
            in_qpair = 0;
            *pos++ = *ptr;
        }
        else {
            switch (*ptr) {
                case '\\': in_qpair = 1;
                           if (addspace == 1)
                               *pos++ = ' ';
                           *pos++ = *ptr;
                           addspace = 0;
                           break;
                case '"' : if (!in_com)
                               in_qstr = !in_qstr;
                           if (addspace == 1)
                               *pos++ = ' ';
                           *pos++ = *ptr;
                           addspace = 0;
                           break;
                case '(' : if (!in_qstr)
                               ++in_com;
                           if (addspace == 1)
                               *pos++ = ' ';
                           *pos++ = *ptr;
                           addspace = 0;
                           break;
                case ')' : if (in_com)
                               --in_com;
                           *pos++ = *ptr;
                           addspace = 0;
                           break;
                case ' ' :
                case '\t': if (addspace)
                               break;
                           if (in_com || in_qstr)
                               *pos++ = *ptr;
                           else
                               addspace = 1;
                           break;
                case '=' :
                case '/' :
                case ';' : if (!(in_com || in_qstr))
                               addspace = -1;
                           *pos++ = *ptr;
                           break;
                default  : if (addspace == 1)
                               *pos++ = ' ';
                           *pos++ = (in_com || in_qstr) ? *ptr
                                                        : apr_tolower(*ptr);
                           addspace = 0;
                           break;
            }
        }
    }
    *pos = '\0';

    return token;
}

/* Find an item in canonical form (lowercase, no extra spaces) within
 * an HTTP field value list.  Returns 1 if found, 0 if not found.
 * This would be much more efficient if we stored header fields as
 * an array of list items as they are received instead of a plain string.
 */
AP_DECLARE(int) ap_find_list_item(apr_pool_t *p, const char *line, const char *tok)
{
    const unsigned char *pos;
    const unsigned char *ptr = (const unsigned char *)line;
    int good = 0, addspace = 0, in_qpair = 0, in_qstr = 0, in_com = 0;

    if (!line || !tok)
        return 0;

    do {  /* loop for each item in line's list */

        /* Find first non-comma, non-whitespace byte */

        while (*ptr == ',' || apr_isspace(*ptr))
            ++ptr;

        if (*ptr)
            good = 1;  /* until proven otherwise for this item */
        else
            break;     /* no items left and nothing good found */

        /* We skip extra whitespace and any whitespace around a '=', '/',
         * or ';' and lowercase normal characters not within a comment,
         * quoted-string or quoted-pair.
         */
        for (pos = (const unsigned char *)tok;
             *ptr && (in_qpair || in_qstr || in_com || *ptr != ',');
             ++ptr) {

            if (in_qpair) {
                in_qpair = 0;
                if (good)
                    good = (*pos++ == *ptr);
            }
            else {
                switch (*ptr) {
                    case '\\': in_qpair = 1;
                               if (addspace == 1)
                                   good = good && (*pos++ == ' ');
                               good = good && (*pos++ == *ptr);
                               addspace = 0;
                               break;
                    case '"' : if (!in_com)
                                   in_qstr = !in_qstr;
                               if (addspace == 1)
                                   good = good && (*pos++ == ' ');
                               good = good && (*pos++ == *ptr);
                               addspace = 0;
                               break;
                    case '(' : if (!in_qstr)
                                   ++in_com;
                               if (addspace == 1)
                                   good = good && (*pos++ == ' ');
                               good = good && (*pos++ == *ptr);
                               addspace = 0;
                               break;
                    case ')' : if (in_com)
                                   --in_com;
                               good = good && (*pos++ == *ptr);
                               addspace = 0;
                               break;
                    case ' ' :
                    case '\t': if (addspace || !good)
                                   break;
                               if (in_com || in_qstr)
                                   good = (*pos++ == *ptr);
                               else
                                   addspace = 1;
                               break;
                    case '=' :
                    case '/' :
                    case ';' : if (!(in_com || in_qstr))
                                   addspace = -1;
                               good = good && (*pos++ == *ptr);
                               break;
                    default  : if (!good)
                                   break;
                               if (addspace == 1)
                                   good = (*pos++ == ' ');
                               if (in_com || in_qstr)
                                   good = good && (*pos++ == *ptr);
                               else
                                   good = good && (*pos++ == apr_tolower(*ptr));
                               addspace = 0;
                               break;
                }
            }
        }
        if (good && *pos)
            good = 0;          /* not good if only a prefix was matched */

    } while (*ptr && !good);

    return good;
}


/* Retrieve a token, spacing over it and returning a pointer to
 * the first non-white byte afterwards.  Note that these tokens
 * are delimited by semis and commas; and can also be delimited
 * by whitespace at the caller's option.
 */

AP_DECLARE(char *) ap_get_token(apr_pool_t *p, const char **accept_line, int accept_white)
{
    const char *ptr = *accept_line;
    const char *tok_start;
    char *token;
    int tok_len;

    /* Find first non-white byte */

    while (*ptr && apr_isspace(*ptr))
        ++ptr;

    tok_start = ptr;

    /* find token end, skipping over quoted strings.
     * (comments are already gone).
     */

    while (*ptr && (accept_white || !apr_isspace(*ptr))
           && *ptr != ';' && *ptr != ',') {
        if (*ptr++ == '"')
            while (*ptr)
                if (*ptr++ == '"')
                    break;
    }

    tok_len = ptr - tok_start;
    token = apr_pstrndup(p, tok_start, tok_len);

    /* Advance accept_line pointer to the next non-white byte */

    while (*ptr && apr_isspace(*ptr))
        ++ptr;

    *accept_line = ptr;
    return token;
}


/* find http tokens, see the definition of token from RFC2068 */
AP_DECLARE(int) ap_find_token(apr_pool_t *p, const char *line, const char *tok)
{
    const unsigned char *start_token;
    const unsigned char *s;

    if (!line)
        return 0;

    s = (const unsigned char *)line;
    for (;;) {
        /* find start of token, skip all stop characters, note NUL
         * isn't a token stop, so we don't need to test for it
         */
        while (TEST_CHAR(*s, T_HTTP_TOKEN_STOP)) {
            ++s;
        }
        if (!*s) {
            return 0;
        }
        start_token = s;
        /* find end of the token */
        while (*s && !TEST_CHAR(*s, T_HTTP_TOKEN_STOP)) {
            ++s;
        }
        if (!strncasecmp((const char *)start_token, (const char *)tok, s - start_token)) {
            return 1;
        }
        if (!*s) {
            return 0;
        }
    }
}


AP_DECLARE(int) ap_find_last_token(apr_pool_t *p, const char *line, const char *tok)
{
    int llen, tlen, lidx;

    if (!line)
        return 0;

    llen = strlen(line);
    tlen = strlen(tok);
    lidx = llen - tlen;

    if ((lidx < 0) ||
        ((lidx > 0) && !(apr_isspace(line[lidx - 1]) || line[lidx - 1] == ',')))
        return 0;

    return (strncasecmp(&line[lidx], tok, tlen) == 0);
}

AP_DECLARE(char *) ap_escape_shell_cmd(apr_pool_t *p, const char *str)
{
    char *cmd;
    unsigned char *d;
    const unsigned char *s;

    cmd = apr_palloc(p, 2 * strlen(str) + 1);   /* Be safe */
    d = (unsigned char *)cmd;
    s = (const unsigned char *)str;
    for (; *s; ++s) {

#if defined(OS2) || defined(WIN32)
        /* Don't allow '&' in parameters under OS/2. */
        /* This can be used to send commands to the shell. */
        if (*s == '&') {
            *d++ = ' ';
            continue;
        }
#endif

        if (TEST_CHAR(*s, T_ESCAPE_SHELL_CMD)) {
            *d++ = '\\';
        }
        *d++ = *s;
    }
    *d = '\0';

    return cmd;
}

static char x2c(const char *what)
{
    register char digit;

#ifndef CHARSET_EBCDIC
    digit = ((what[0] >= 'A') ? ((what[0] & 0xdf) - 'A') + 10 : (what[0] - '0'));
    digit *= 16;
    digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A') + 10 : (what[1] - '0'));
#else /*CHARSET_EBCDIC*/
    char xstr[5];
    xstr[0]='0';
    xstr[1]='x';
    xstr[2]=what[0];
    xstr[3]=what[1];
    xstr[4]='\0';
    digit = apr_xlate_conv_byte(ap_hdrs_from_ascii, 0xFF & strtol(xstr, NULL, 16));
#endif /*CHARSET_EBCDIC*/
    return (digit);
}

/*
 * Unescapes a URL.
 * Returns 0 on success, non-zero on error
 * Failure is due to
 *   bad % escape       returns HTTP_BAD_REQUEST
 *
 *   decoding %00 -> \0
 *   decoding %2f -> /   (a special character)
 *                      returns HTTP_NOT_FOUND
 */
AP_DECLARE(int) ap_unescape_url(char *url)
{
    register int badesc, badpath;
    char *x, *y;

    badesc = 0;
    badpath = 0;
    /* Initial scan for first '%'. Don't bother writing values before
     * seeing a '%' */
    y = strchr(url, '%');
    if (y == NULL) {
        return OK;
    }
    for (x = y; *y; ++x, ++y) {
        if (*y != '%')
            *x = *y;
        else {
            if (!apr_isxdigit(*(y + 1)) || !apr_isxdigit(*(y + 2))) {
                badesc = 1;
                *x = '%';
            }
            else {
                *x = x2c(y + 1);
                y += 2;
                if (*x == '/' || *x == '\0')
                    badpath = 1;
            }
        }
    }
    *x = '\0';
    if (badesc)
        return HTTP_BAD_REQUEST;
    else if (badpath)
        return HTTP_NOT_FOUND;
    else
        return OK;
}

AP_DECLARE(char *) ap_construct_server(apr_pool_t *p, const char *hostname,
                                    apr_port_t port, const request_rec *r)
{
    if (ap_is_default_port(port, r))
        return apr_pstrdup(p, hostname);
    else {
        return apr_psprintf(p, "%s:%u", hostname, port);
    }
}

/* c2x takes an unsigned, and expects the caller has guaranteed that
 * 0 <= what < 256... which usually means that you have to cast to
 * unsigned char first, because (unsigned)(char)(x) first goes through
 * signed extension to an int before the unsigned cast.
 *
 * The reason for this assumption is to assist gcc code generation --
 * the unsigned char -> unsigned extension is already done earlier in
 * both uses of this code, so there's no need to waste time doing it
 * again.
 */
static const char c2x_table[] = "0123456789abcdef";

static apr_inline unsigned char *c2x(unsigned what, unsigned char *where)
{
#ifdef CHARSET_EBCDIC
    what = apr_xlate_conv_byte(ap_hdrs_to_ascii, (unsigned char)what);
#endif /*CHARSET_EBCDIC*/
    *where++ = '%';
    *where++ = c2x_table[what >> 4];
    *where++ = c2x_table[what & 0xf];
    return where;
}

/*
 * escape_path_segment() escapes a path segment, as defined in RFC 1808. This
 * routine is (should be) OS independent.
 *
 * os_escape_path() converts an OS path to a URL, in an OS dependent way. In all
 * cases if a ':' occurs before the first '/' in the URL, the URL should be
 * prefixed with "./" (or the ':' escaped). In the case of Unix, this means
 * leaving '/' alone, but otherwise doing what escape_path_segment() does. For
 * efficiency reasons, we don't use escape_path_segment(), which is provided for
 * reference. Again, RFC 1808 is where this stuff is defined.
 *
 * If partial is set, os_escape_path() assumes that the path will be appended to
 * something with a '/' in it (and thus does not prefix "./").
 */

AP_DECLARE(char *) ap_escape_path_segment(apr_pool_t *p, const char *segment)
{
    char *copy = apr_palloc(p, 3 * strlen(segment) + 1);
    const unsigned char *s = (const unsigned char *)segment;
    unsigned char *d = (unsigned char *)copy;
    unsigned c;

    while ((c = *s)) {
        if (TEST_CHAR(c, T_ESCAPE_PATH_SEGMENT)) {
            d = c2x(c, d);
        }
        else {
            *d++ = c;
        }
        ++s;
    }
    *d = '\0';
    return copy;
}

AP_DECLARE(char *) ap_os_escape_path(apr_pool_t *p, const char *path, int partial)
{
    char *copy = apr_palloc(p, 3 * strlen(path) + 3);
    const unsigned char *s = (const unsigned char *)path;
    unsigned char *d = (unsigned char *)copy;
    unsigned c;

    if (!partial) {
        const char *colon = ap_strchr_c(path, ':');
        const char *slash = ap_strchr_c(path, '/');

        if (colon && (!slash || colon < slash)) {
            *d++ = '.';
            *d++ = '/';
        }
    }
    while ((c = *s)) {
        if (TEST_CHAR(c, T_OS_ESCAPE_PATH)) {
            d = c2x(c, d);
        }
        else {
            *d++ = c;
        }
        ++s;
    }
    *d = '\0';
    return copy;
}

/* ap_escape_uri is now a macro for os_escape_path */

AP_DECLARE(char *) ap_escape_html(apr_pool_t *p, const char *s)
{
    int i, j;
    char *x;

    /* first, count the number of extra characters */
    for (i = 0, j = 0; s[i] != '\0'; i++)
        if (s[i] == '<' || s[i] == '>')
            j += 3;
        else if (s[i] == '&')
            j += 4;

    if (j == 0)
        return apr_pstrndup(p, s, i);

    x = apr_palloc(p, i + j + 1);
    for (i = 0, j = 0; s[i] != '\0'; i++, j++)
        if (s[i] == '<') {
            memcpy(&x[j], "&lt;", 4);
            j += 3;
        }
        else if (s[i] == '>') {
            memcpy(&x[j], "&gt;", 4);
            j += 3;
        }
        else if (s[i] == '&') {
            memcpy(&x[j], "&amp;", 5);
            j += 4;
        }
        else
            x[j] = s[i];

    x[j] = '\0';
    return x;
}

AP_DECLARE(int) ap_is_directory(const char *path)
{
    apr_finfo_t finfo;

    if (apr_stat(&finfo, path, NULL) == -1)
        return 0;               /* in error condition, just return no */

    return (finfo.filetype == APR_DIR);
}

AP_DECLARE(int) ap_is_rdirectory(const char *path)
{
    apr_finfo_t finfo;

    if (apr_lstat(&finfo, path, NULL) == -1)
        return 0;               /* in error condition, just return no */

    return (finfo.filetype == APR_DIR);
}

AP_DECLARE(char *) ap_make_full_path(apr_pool_t *a, const char *src1,
                                  const char *src2)
{
    register int x;

    x = strlen(src1);
    if (x == 0)
        return apr_pstrcat(a, "/", src2, NULL);

    if (src1[x - 1] != '/')
        return apr_pstrcat(a, src1, "/", src2, NULL);
    else
        return apr_pstrcat(a, src1, src2, NULL);
}

/*
 * Check for an absoluteURI syntax (see section 3.2 in RFC2068).
 */
AP_DECLARE(int) ap_is_url(const char *u)
{
    register int x;

    for (x = 0; u[x] != ':'; x++) {
        if ((!u[x]) ||
            ((!apr_isalpha(u[x])) && (!apr_isdigit(u[x])) &&
             (u[x] != '+') && (u[x] != '-') && (u[x] != '.'))) {
            return 0;
        }
    }

    return (x ? 1 : 0);         /* If the first character is ':', it's broken, too */
}

#ifndef HAVE_INITGROUPS
int initgroups(const char *name, gid_t basegid)
{
#if defined(QNX) || defined(MPE) || defined(BEOS) || defined(_OSD_POSIX) || defined(TPF) || defined(__TANDEM) || defined(OS2) || defined(WIN32)
/* QNX, MPE and BeOS do not appear to support supplementary groups. */
    return 0;
#else /* ndef QNX */
    gid_t groups[NGROUPS_MAX];
    struct group *g;
    int index = 0;

    setgrent();

    groups[index++] = basegid;

    while (index < NGROUPS_MAX && ((g = getgrent()) != NULL))
        if (g->gr_gid != basegid) {
            char **names;

            for (names = g->gr_mem; *names != NULL; ++names)
                if (!strcmp(*names, name))
                    groups[index++] = g->gr_gid;
        }

    endgrent();

    return setgroups(index, groups);
#endif /* def QNX */
}
#endif /* def NEED_INITGROUPS */

AP_DECLARE(int) ap_ind(const char *s, char c)
{
    register int x;

    for (x = 0; s[x]; x++)
        if (s[x] == c)
            return x;

    return -1;
}

AP_DECLARE(int) ap_rind(const char *s, char c)
{
    register int x;

    for (x = strlen(s) - 1; x != -1; x--)
        if (s[x] == c)
            return x;

    return -1;
}

AP_DECLARE(void) ap_str_tolower(char *str)
{
    while (*str) {
        *str = apr_tolower(*str);
        ++str;
    }
}

AP_DECLARE(uid_t) ap_uname2id(const char *name)
{
#ifdef WIN32
    return (1);
#else
    struct passwd *ent;

    if (name[0] == '#')
        return (atoi(&name[1]));

    if (!(ent = getpwnam(name))) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "%s: bad user name %s", ap_server_argv0, name);
        exit(1);
    }
    return (ent->pw_uid);
#endif
}

AP_DECLARE(gid_t) ap_gname2id(const char *name)
{
#ifdef WIN32
    return (1);
#else
    struct group *ent;

    if (name[0] == '#')
        return (atoi(&name[1]));

    if (!(ent = getgrnam(name))) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "%s: bad group name %s", ap_server_argv0, name);
        exit(1);
    }
    return (ent->gr_gid);
#endif
}


/*
 * Parses a host of the form <address>[:port]
 * :port is permitted if 'port' is not NULL
 */
unsigned long ap_get_virthost_addr(char *w, apr_port_t *ports)
{
    struct hostent *hep;
    unsigned long my_addr;
    char *p;

    p = strchr(w, ':');
    if (ports != NULL) {
        *ports = 0;
        if (p != NULL && strcmp(p + 1, "*") != 0)
            *ports = atoi(p + 1);
    }

    if (p != NULL)
        *p = '\0';
    if (strcmp(w, "*") == 0) {
        if (p != NULL)
            *p = ':';
        return htonl(INADDR_ANY);
    }

    my_addr = apr_inet_addr((char *)w);
    if (my_addr != INADDR_NONE) {
        if (p != NULL)
            *p = ':';
        return my_addr;
    }

    hep = gethostbyname(w);

    if ((!hep) || (hep->h_addrtype != AF_INET || !hep->h_addr_list[0])) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "Cannot resolve host name %s --- exiting!", w);
        exit(1);
    }

    if (hep->h_addr_list[1]) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "Host %s has multiple addresses ---", w);
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "you must choose one explicitly for use as");
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "a virtual host.  Exiting!!!");
        exit(1);
    }

    if (p != NULL)
        *p = ':';

    return ((struct in_addr *) (hep->h_addr))->s_addr;
}


static char *find_fqdn(apr_pool_t *a, struct hostent *p)
{
    int x;

    if (!strchr(p->h_name, '.')) {
        for (x = 0; p->h_aliases[x]; ++x) {
            if (strchr(p->h_aliases[x], '.') &&
                (!strncasecmp(p->h_aliases[x], p->h_name, strlen(p->h_name))))
                return apr_pstrdup(a, p->h_aliases[x]);
        }
        return NULL;
    }
    return apr_pstrdup(a, (void *) p->h_name);
}

char *ap_get_local_host(apr_pool_t *a)
{
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 256
#endif
    char str[MAXHOSTNAMELEN + 1];
    char *server_hostname = NULL;
    struct hostent *p;

#ifdef BEOS
    if (gethostname(str, sizeof(str) - 1) == 0)
#else
    if (gethostname(str, sizeof(str) - 1) != 0)
#endif
    {
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_WARNING, 0, NULL,
                     "%s: gethostname() failed to detemine ServerName",
                     ap_server_argv0);
    }
    else 
    {
        str[sizeof(str) - 1] = '\0';
        if ((!(p = gethostbyname(str))) 
            || (!(server_hostname = find_fqdn(a, p)))) {
            /* Recovery - return the default servername by IP: */
            if (!str && p->h_addr_list[0]) {
                apr_snprintf(str, sizeof(str), "%pA", p->h_addr_list[0]);
                server_hostname = apr_pstrdup(a, str);
                /* We will drop through to report the IP-named server */
            }
        }
        else {
            /* Since we found a fdqn, return it with no logged message. */
            return server_hostname;
        }
    }

    if (!server_hostname) 
        server_hostname = apr_pstrdup(a, "127.0.0.1");

    ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO|APLOG_STARTUP, 0, NULL,
                 "%s: Could not find determine the server's fully qualified "
                 "domain name, using %s for ServerName",
                 ap_server_argv0, server_hostname);
             
    return server_hostname;
}

/* simple 'pool' alloc()ing glue to ap_base64.c
 */
AP_DECLARE(char *) ap_pbase64decode(apr_pool_t *p, const char *bufcoded)
{
    char *decoded;
    int l;

    decoded = (char *) apr_palloc(p, 1 + ap_base64decode_len(bufcoded));
    l = ap_base64decode(decoded, bufcoded);
    decoded[l] = '\0'; /* make binary sequence into string */

    return decoded;
}

AP_DECLARE(char *) ap_pbase64encode(apr_pool_t *p, char *string) 
{ 
    char *encoded;
    int l = strlen(string);

    encoded = (char *) apr_palloc(p, 1 + ap_base64encode_len(l));
    l = ap_base64encode(encoded, string, l);
    encoded[l] = '\0'; /* make binary sequence into string */

    return encoded;
}

/* we want to downcase the type/subtype for comparison purposes
 * but nothing else because ;parameter=foo values are case sensitive.
 * XXX: in truth we want to downcase parameter names... but really,
 * apache has never handled parameters and such correctly.  You
 * also need to compress spaces and such to be able to compare
 * properly. -djg
 */
AP_DECLARE(void) ap_content_type_tolower(char *str)
{
    char *semi;

    semi = strchr(str, ';');
    if (semi) {
        *semi = '\0';
    }
    while (*str) {
        *str = apr_tolower(*str);
        ++str;
    }
    if (semi) {
        *semi = ';';
    }
}

/*
 * Given a string, replace any bare " with \" .
 */
AP_DECLARE(char *) ap_escape_quotes (apr_pool_t *p, const char *instring)
{
    int newlen = 0;
    const char *inchr = instring;
    char *outchr, *outstring;

    /*
     * Look through the input string, jogging the length of the output
     * string up by an extra byte each time we find an unescaped ".
     */
    while (*inchr != '\0') {
        newlen++;
        if (*inchr == '"') {
            newlen++;
        }
        /*
         * If we find a slosh, and it's not the last byte in the string,
         * it's escaping something - advance past both bytes.
         */
        if ((*inchr == '\\') && (inchr[1] != '\0')) {
            inchr++;
            newlen++;
        }
        inchr++;
    }
    outstring = apr_palloc(p, newlen + 1);
    inchr = instring;
    outchr = outstring;
    /*
     * Now copy the input string to the output string, inserting a slosh
     * in front of every " that doesn't already have one.
     */
    while (*inchr != '\0') {
        if ((*inchr == '\\') && (inchr[1] != '\0')) {
            *outchr++ = *inchr++;
            *outchr++ = *inchr++;
        }
        if (*inchr == '"') {
            *outchr++ = '\\';
        }
        if (*inchr != '\0') {
            *outchr++ = *inchr++;
        }
    }
    *outchr = '\0';
    return outstring;
}