Quelle util.c Sprache: C

/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/*
* 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
*/

#include "apr.h"
#include "apr_strings.h"
#include "apr_lib.h"

#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include "apr_want.h"

#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_PROCESS_H
#include <process.h>            /* for getpid() on Win32 */
#endif
#if APR_HAVE_NETDB_H
#include <netdb.h>              /* for gethostbyname() */
#endif

#include "ap_config.h"
#include "apr_base64.h"
#include "apr_fnmatch.h"
#include "httpd.h"
#include "http_main.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_config.h"
#include "http_core.h"
#include "util_ebcdic.h"
#include "util_varbuf.h"

#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_SYS_LOADAVG_H
#include <sys/loadavg.h>
#endif

#include "ap_mpm.h"

/* 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 know core's module_index is 0 */
#undef APLOG_MODULE_INDEX
#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX

/* maximum nesting level for config directories */
#ifndef AP_MAX_FNMATCH_DIR_DEPTH
#define AP_MAX_FNMATCH_DIR_DEPTH (128)
#endif

/*
* 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_pstrmemdup(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_time_exp_t xt;

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

        apr_time_exp_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_time_exp_lt(&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 *expected)
{
    apr_size_t x, y;

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

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

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

/* We actually compare the canonical root to this root, (but we don't
* waste time checking the case), since every use of this function in
* httpd-2.1 tests if the path is 'proper', meaning we've already passed
* it through apr_filepath_merge, or we haven't.
*/
AP_DECLARE(int) ap_os_is_path_absolute(apr_pool_t *p, const char *dir)
{
    const char *newpath;
    const char *ourdir = dir;
    if (apr_filepath_root(&newpath, &dir, 0, p) != APR_SUCCESS
            || strncmp(newpath, ourdir, strlen(newpath)) != 0) {
        return 0;
    }
    return 1;
}

AP_DECLARE(int) ap_is_matchexp(const char *str)
{
    for (; *str; str++)
        if ((*str == '*') || (*str == '?'))
            return 1;
    return 0;
}

/*
* Here's a pool-based interface to the POSIX-esque ap_regcomp().
* Note that we return ap_regex_t instead of being passed one.
* The reason is that if you use an already-used ap_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)
{
    ap_regfree((ap_regex_t *) preg);
    return APR_SUCCESS;
}

AP_DECLARE(ap_regex_t *) ap_pregcomp(apr_pool_t *p, const char *pattern,
                                     int cflags)
{
    ap_regex_t *preg = apr_palloc(p, sizeof *preg);
    int err = ap_regcomp(preg, pattern, cflags);
    if (err) {
        if (err == AP_REG_ESPACE)
            ap_abort_on_oom();
        return NULL;
    }

    apr_pool_cleanup_register(p, (void *) preg, regex_cleanup,
                              apr_pool_cleanup_null);

    return preg;
}

AP_DECLARE(void) ap_pregfree(apr_pool_t *p, ap_regex_t *reg)
{
    ap_regfree(reg);
    apr_pool_cleanup_kill(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;
        for (++p1, ++p2; apr_tolower(*p1) == apr_tolower(*p2); ++p1, ++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;
}

/* 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 ap_regex_t.
*
* nmatch must be <=AP_MAX_REG_MATCH (10).
*
* input should be the string with the $-expressions, source should be the
* string that was matched against.
*
* It returns the substituted string, or NULL if a vbuf is used.
* On errors, returns the orig string.
*
* Parts of this code are based on Henry Spencer's regsub(), from his
* AT&T V8 regexp package.
*/

static apr_status_t regsub_core(apr_pool_t *p, char **result,
                                struct ap_varbuf *vb, const char *input,
                                const char *source, apr_size_t nmatch,
                                ap_regmatch_t pmatch[], apr_size_t maxlen)
{
    const char *src = input;
    char *dst;
    char c;
    apr_size_t no;
    apr_size_t len = 0;

    AP_DEBUG_ASSERT((result && p && !vb) || (vb && !p && !result));
    if (!source || nmatch>AP_MAX_REG_MATCH)
        return APR_EINVAL;
    if (!nmatch) {
        len = strlen(src);
        if (maxlen > 0 && len >= maxlen)
            return APR_ENOMEM;
        if (!vb) {
            *result = apr_pstrmemdup(p, src, len);
            return APR_SUCCESS;
        }
        else {
            ap_varbuf_strmemcat(vb, src, len);
            return APR_SUCCESS;
        }
    }

    /* First pass, find the size */
    while ((c = *src++) != '\0') {
        if (c == '$' && apr_isdigit(*src))
            no = *src++ - '0';
        else
            no = AP_MAX_REG_MATCH;

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

    }

    if (len >= maxlen && maxlen > 0)
        return APR_ENOMEM;

    if (!vb) {
        *result = dst = apr_palloc(p, len + 1);
    }
    else {
        if (vb->strlen == AP_VARBUF_UNKNOWN)
            vb->strlen = strlen(vb->buf);
        ap_varbuf_grow(vb, vb->strlen + len);
        dst = vb->buf + vb->strlen;
        vb->strlen += len;
    }

    /* Now actually fill in the string */

    src = input;

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

        if (no >= AP_MAX_REG_MATCH) {  /* Ordinary character. */
            if (c == '\\' && *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 APR_SUCCESS;
}

#ifndef AP_PREGSUB_MAXLEN
#define AP_PREGSUB_MAXLEN   (HUGE_STRING_LEN * 8)
#endif
AP_DECLARE(char *) ap_pregsub(apr_pool_t *p, const char *input,
                              const char *source, apr_size_t nmatch,
                              ap_regmatch_t pmatch[])
{
    char *result;
    apr_status_t rc = regsub_core(p, &result, NULL, input, source, nmatch,
                                  pmatch, AP_PREGSUB_MAXLEN);
    if (rc != APR_SUCCESS)
        result = NULL;
    return result;
}

AP_DECLARE(apr_status_t) ap_pregsub_ex(apr_pool_t *p, char **result,
                                       const char *input, const char *source,
                                       apr_size_t nmatch, ap_regmatch_t pmatch[],
                                       apr_size_t maxlen)
{
    apr_status_t rc = regsub_core(p, result, NULL, input, source, nmatch,
                                  pmatch, maxlen);
    if (rc != APR_SUCCESS)
        *result = NULL;
    return rc;
}

/* Forward declare */
static char x2c(const char *what);

#define IS_SLASH_OR_NUL(s) (s == '\0' || AP_IS_SLASH(s))

/*
* Inspired by mod_jk's jk_servlet_normalize().
*/
AP_DECLARE(int) ap_normalize_path(char *path, unsigned int flags)
{
    int ret = 1;
    apr_size_t l = 1, w = 1, n;
    int decode_unreserved = (flags & AP_NORMALIZE_DECODE_UNRESERVED) != 0;
    int merge_slashes = (flags & AP_NORMALIZE_MERGE_SLASHES) != 0;

    if (!AP_IS_SLASH(path[0])) {
        /* Besides "OPTIONS *", a request-target should start with '/'
         * per RFC 7230 section 5.3, so anything else is invalid.
         */
        if (path[0] == '*' && path[1] == '\0') {
            return 1;
        }
        /* However, AP_NORMALIZE_ALLOW_RELATIVE can be used to bypass
         * this restriction (e.g. for subrequest file lookups).
         */
        if (!(flags & AP_NORMALIZE_ALLOW_RELATIVE) || path[0] == '\0') {
            return 0;
        }

        l = w = 0;
    }

    while (path[l] != '\0') {
        /* RFC-3986 section 2.3:
         *  For consistency, percent-encoded octets in the ranges of
         *  ALPHA (%41-%5A and %61-%7A), DIGIT (%30-%39), hyphen (%2D),
         *  period (%2E), underscore (%5F), or tilde (%7E) should [...]
         *  be decoded to their corresponding unreserved characters by
         *  URI normalizers.
         */
        if (decode_unreserved && path[l] == '%') {
            if (apr_isxdigit(path[l + 1]) && apr_isxdigit(path[l + 2])) {
                const char c = x2c(&path[l + 1]);
                if (TEST_CHAR(c, T_URI_UNRESERVED)) {
                    /* Replace last char and fall through as the current
                     * read position */
                    l += 2;
                    path[l] = c;
                }
            }
            else {
                /* Invalid encoding */
                ret = 0;
            }
        }

        if (w == 0 || AP_IS_SLASH(path[w - 1])) {
            /* Collapse ///// sequences to / */
            if (merge_slashes && AP_IS_SLASH(path[l])) {
                do {
                    l++;
                } while (AP_IS_SLASH(path[l]));
                continue;
            }

            if (path[l] == '.') {
                /* Remove /./ segments */
                if (IS_SLASH_OR_NUL(path[l + 1])) {
                    l++;
                    if (path[l]) {
                        l++;
                    }
                    continue;
                }

                /* Remove /xx/../ segments (or /xx/.%2e/ when
                 * AP_NORMALIZE_DECODE_UNRESERVED is set since we
                 * decoded only the first dot above).
                 */
                n = l + 1;
                if ((path[n] == '.' || (decode_unreserved
                                        && path[n] == '%'
                                        && path[++n] == '2'
                                        && (path[++n] == 'e'
                                            || path[n] == 'E')))
                        && IS_SLASH_OR_NUL(path[n + 1])) {
                    /* Wind w back to remove the previous segment */
                    if (w > 1) {
                        do {
                            w--;
                        } while (w && !AP_IS_SLASH(path[w - 1]));
                    }
                    else {
                        /* Already at root, ignore and return a failure
                         * if asked to.
                         */
                        if (flags & AP_NORMALIZE_NOT_ABOVE_ROOT) {
                            ret = 0;
                        }
                    }

                    /* Move l forward to the next segment */
                    l = n + 1;
                    if (path[l]) {
                        l++;
                    }
                    continue;
                }
            }
        }

        path[w++] = path[l++];
    }
    path[w] = '\0';

    return ret;
}

/*
* Parse .. so we don't compromise security
*/
AP_DECLARE(void) ap_getparents(char *name)
{
    if (!ap_normalize_path(name, AP_NORMALIZE_NOT_ABOVE_ROOT |
                                 AP_NORMALIZE_ALLOW_RELATIVE)) {
        name[0] = '\0';
    }
}

AP_DECLARE(void) ap_no2slash_ex(char *name, int is_fs_path)
{

    char *d, *s;

    if (!*name) {
        return;
    }

    s = d = name;

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

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

AP_DECLARE(void) ap_no2slash(char *name)
{
    ap_no2slash_ex(name, 1);
}

/*
* 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 ap_directory_walk in server/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) {
        return apr_pstrdup(p, "");
    }
    l = (last_slash - s) + 1;
    d = apr_pstrmemdup(p, s, l);

    return (d);
}

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

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

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 = *line;
    int len;
    char *res;

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

    len = pos - *line;
    res = apr_pstrmemdup(atrans, *line, len);

    if (stop) {
        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)
{
    const char *pos = *line;
    int len;
    char *res;

    while (!apr_isspace(*pos) && *pos) {
        ++pos;
    }

    len = pos - *line;
    res = apr_pstrmemdup(atrans, *line, len);

    while (apr_isspace(*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) {
        apr_size_t len = strlen(*line);
        res = apr_pstrmemdup(atrans, *line, len);
        *line += len;
        return res;
    }

    res = apr_pstrmemdup(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 + 1);
    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 (char *)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 (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[1] == '\\')) {
                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 (apr_isspace(*strend))
        ++strend;
    *line = strend;
    return res;
}

AP_DECLARE(char *) ap_getword_conf2_nc(apr_pool_t *p, char **line)
{
    return ap_getword_conf2(p, (const char **) line);
}

AP_DECLARE(char *) ap_getword_conf2(apr_pool_t *p, const char **line)
{
    const char *str = *line, *strend;
    char *res;
    char quote;
    int count = 1;

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

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

    if ((quote = *str) == '"' || quote == '\'')
        return ap_getword_conf(p, line);

    if (quote == '{') {
        strend = str + 1;
        while (*strend) {
            if (*strend == '}' && !--count)
                break;
            if (*strend == '{')
                ++count;
            if (*strend == '\\' && strend[1] && strend[1] == '\\') {
                ++strend;
            }
            ++strend;
        }
        res = substring_conf(p, str + 1, strend - str - 1, 0);

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

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

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

AP_DECLARE(int) ap_cfg_closefile(ap_configfile_t *cfp)
{
#ifdef DEBUG
    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, APLOGNO(00551)
        "Done with config file %s", cfp->name);
#endif
    return (cfp->close == NULL) ? 0 : cfp->close(cfp->param);
}

/* we can't use apr_file_* directly because of linking issues on Windows */
static apr_status_t cfg_close(void *param)
{
    return apr_file_close(param);
}

static apr_status_t cfg_getch(char *ch, void *param)
{
    return apr_file_getc(ch, param);
}

static apr_status_t cfg_getstr(void *buf, apr_size_t bufsiz, void *param)
{
    return apr_file_gets(buf, bufsiz, param);
}

/* Open a ap_configfile_t as FILE, return open ap_configfile_t struct pointer */
AP_DECLARE(apr_status_t) ap_pcfg_openfile(ap_configfile_t **ret_cfg,
                                          apr_pool_t *p, const char *name)
{
    ap_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, 0, NULL, APLOGNO(00552)
               "Internal error: pcfg_openfile() called with NULL filename");
        return APR_EBADF;
    }

    status = apr_file_open(&file, name, APR_READ | APR_BUFFERED,
                           APR_OS_DEFAULT, p);
#ifdef DEBUG
    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, APLOGNO(00553)
                "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_file_info_get(&finfo, APR_FINFO_TYPE, file);
    if (status != APR_SUCCESS)
        return status;

    if (finfo.filetype != APR_REG &&
#if defined(WIN32) || defined(OS2) || defined(NETWARE)
        ap_cstr_casecmp(apr_filepath_name_get(name), "nul") != 0) {
#else
        strcmp(name, "/dev/null") != 0) {
#endif /* WIN32 || OS2 */
        ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(00554)
                     "Access to file %s denied by server: not a regular file",
                     name);
        apr_file_close(file);
        return APR_EBADF;
    }

#ifdef WIN32
    /* Some twisted character [no pun intended] at MS decided that a
     * zero width joiner as the lead wide character would be ideal for
     * describing Unicode text files.  This was further convoluted to
     * another MSism that the same character mapped into utf-8, EF BB BF
     * would signify utf-8 text files.
     *
     * Since MS configuration files are all protecting utf-8 encoded
     * Unicode path, file and resource names, we already have the correct
     * WinNT encoding.  But at least eat the stupid three bytes up front.
     */
    {
        unsigned char buf[4];
        apr_size_t len = 3;
        status = apr_file_read(file, buf, &len);
        if ((status != APR_SUCCESS) || (len < 3)
              || memcmp(buf, "\xEF\xBB\xBF", 3) != 0) {
            apr_off_t zero = 0;
            apr_file_seek(file, APR_SET, &zero);
        }
    }
#endif

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

/* Allocate a ap_configfile_t handle with user defined functions and params */
AP_DECLARE(ap_configfile_t *) ap_pcfg_open_custom(
            apr_pool_t *p, const char *descr, void *param,
            apr_status_t (*getc_func) (char *ch, void *param),
            apr_status_t (*gets_func) (void *buf, apr_size_t bufsize, void *param),
            apr_status_t (*close_func) (void *param))
{
    ap_configfile_t *new_cfg = apr_palloc(p, sizeof(*new_cfg));
    new_cfg->param = param;
    new_cfg->name = descr;
    new_cfg->getch = getc_func;
    new_cfg->getstr = gets_func;
    new_cfg->close = close_func;
    new_cfg->line_number = 0;
    return new_cfg;
}

/* Read one character from a configfile_t */
AP_DECLARE(apr_status_t) ap_cfg_getc(char *ch, ap_configfile_t *cfp)
{
    apr_status_t rc = cfp->getch(ch, cfp->param);
    if (rc == APR_SUCCESS && *ch == LF)
        ++cfp->line_number;
    return rc;
}

AP_DECLARE(const char *) ap_pcfg_strerror(apr_pool_t *p, ap_configfile_t *cfp,
                                          apr_status_t rc)
{
    if (rc == APR_SUCCESS)
        return NULL;

    if (rc == APR_ENOSPC)
        return apr_psprintf(p, "Error reading %s at line %d: Line too long",
                            cfp->name, cfp->line_number);

    return apr_psprintf(p, "Error reading %s at line %d: %pm",
                        cfp->name, cfp->line_number, &rc);
}

/* Read one line from open ap_configfile_t, strip LF, increase line number */
/* If custom handler does not define a getstr() function, read char by char */
static apr_status_t ap_cfg_getline_core(char *buf, apr_size_t bufsize,
                                        apr_size_t offset, ap_configfile_t *cfp)
{
    apr_status_t rc;
    /* If a "get string" function is defined, use it */
    if (cfp->getstr != NULL) {
        char *cp;
        char *cbuf = buf + offset;
        apr_size_t cbufsize = bufsize - offset;

        while (1) {
            ++cfp->line_number;
            rc = cfp->getstr(cbuf, cbufsize, cfp->param);
            if (rc == APR_EOF) {
                if (cbuf != buf + offset) {
                    *cbuf = '\0';
                    break;
                }
                else {
                    return APR_EOF;
                }
            }
            if (rc != APR_SUCCESS) {
                return rc;
            }

            /*
             *  check for line continuation,
             *  i.e. match [^\\]\\[\r]\n only
             */
            cp = cbuf;
            cp += strlen(cp);
            if (cp > buf && cp[-1] == LF) {
                cp--;
                if (cp > buf && cp[-1] == CR)
                    cp--;
                if (cp > buf && cp[-1] == '\\') {
                    cp--;
                    /*
                     * line continuation requested -
                     * then remove backslash and continue
                     */
                    cbufsize -= (cp-cbuf);
                    cbuf = cp;
                    continue;
                }
            }
            else if (cp - buf >= bufsize - 1) {
                return APR_ENOSPC;
            }
            break;
        }
    } else {
        /* No "get string" function defined; read character by character */
        apr_size_t i = offset;

        if (bufsize < 2) {
            /* too small, assume caller is crazy */
            return APR_EINVAL;
        }
        buf[offset] = '\0';

        while (1) {
            char c;
            rc = cfp->getch(&c, cfp->param);
            if (rc == APR_EOF) {
                if (i > offset)
                    break;
                else
                    return APR_EOF;
            }
            if (rc != APR_SUCCESS)
                return rc;
            if (c == LF) {
                ++cfp->line_number;
                /* check for line continuation */
                if (i > 0 && buf[i-1] == '\\') {
                    i--;
                    continue;
                }
                else {
                    break;
                }
            }
            buf[i] = c;
            ++i;
            if (i >= bufsize - 1) {
                return APR_ENOSPC;
            }
        }
        buf[i] = '\0';
    }
    return APR_SUCCESS;
}

static int cfg_trim_line(char *buf)
{
    char *start, *end;
    /*
     * Leading and trailing white space is eliminated completely
     */
    start = buf;
    while (apr_isspace(*start))
        ++start;
    /* blast trailing whitespace */
    end = &start[strlen(start)];
    while (--end >= start && apr_isspace(*end))
        *end = '\0';
    /* Zap leading whitespace by shifting */
    if (start != buf)
        memmove(buf, start, end - start + 2);
#ifdef DEBUG_CFG_LINES
    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, NULL, APLOGNO(00555) "Read config: '%s'", buf);
#endif
    return end - start + 1;
}

/* Read one line from open ap_configfile_t, strip LF, increase line number */
/* If custom handler does not define a getstr() function, read char by char */
AP_DECLARE(apr_status_t) ap_cfg_getline(char *buf, apr_size_t bufsize,
                                        ap_configfile_t *cfp)
{
    apr_status_t rc = ap_cfg_getline_core(buf, bufsize, 0, cfp);
    if (rc == APR_SUCCESS)
        cfg_trim_line(buf);
    return rc;
}

AP_DECLARE(apr_status_t) ap_varbuf_cfg_getline(struct ap_varbuf *vb,
                                               ap_configfile_t *cfp,
                                               apr_size_t max_len)
{
    apr_status_t rc;
    apr_size_t new_len;
    vb->strlen = 0;
    *vb->buf = '\0';

    if (vb->strlen == AP_VARBUF_UNKNOWN)
        vb->strlen = strlen(vb->buf);
    if (vb->avail - vb->strlen < 3) {
        new_len = vb->avail * 2;
        if (new_len > max_len)
            new_len = max_len;
        else if (new_len < 3)
            new_len = 3;
        ap_varbuf_grow(vb, new_len);
    }

    for (;;) {
        rc = ap_cfg_getline_core(vb->buf, vb->avail, vb->strlen, cfp);
        if (rc == APR_ENOSPC || rc == APR_SUCCESS)
            vb->strlen += strlen(vb->buf + vb->strlen);
        if (rc != APR_ENOSPC)
            break;
        if (vb->avail >= max_len)
            return APR_ENOSPC;
        new_len = vb->avail * 2;
        if (new_len > max_len)
            new_len = max_len;
        ap_varbuf_grow(vb, new_len);
        --cfp->line_number;
    }
    if (vb->strlen > max_len)
        return APR_ENOSPC;
    if (rc == APR_SUCCESS)
        vb->strlen = cfg_trim_line(vb->buf);
    return rc;
}

/* 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;
}

typedef enum ap_etag_e {
    AP_ETAG_NONE,
    AP_ETAG_WEAK,
    AP_ETAG_STRONG
} ap_etag_e;

/* 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.
*/
static int find_list_item(apr_pool_t *p, const char *line,
                                  const char *tok, ap_etag_e type)
{
    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;
    }
    if (type == AP_ETAG_STRONG && *tok != '\"') {
        return 0;
    }
    if (type == AP_ETAG_WEAK) {
        if (*tok == 'W' && (*(tok+1)) == '/' && (*(tok+2)) == '\"') {
            tok += 2;
        }
        else if (*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;
        }

        /* Account for strong or weak Etags, depending on our search */
        if (type == AP_ETAG_STRONG && *ptr != '\"') {
            break;
        }
        if (type == AP_ETAG_WEAK) {
            if (*ptr == 'W' && (*(ptr+1)) == '/' && (*(ptr+2)) == '\"') {
                ptr += 2;
            }
            else if (*ptr != '\"') {
                break;
            }
        }

        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
                                       && (apr_tolower(*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;
}

/* 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)
{
    return find_list_item(p, line, tok, AP_ETAG_NONE);
}

/* Find a strong Etag in canonical form (lowercase, no extra spaces) within
* an HTTP field value list.  Returns 1 if found, 0 if not found.
*/
AP_DECLARE(int) ap_find_etag_strong(apr_pool_t *p, const char *line,
                                    const char *tok)
{
    return find_list_item(p, line, tok, AP_ETAG_STRONG);
}

/* Find a weak ETag in canonical form (lowercase, no extra spaces) within
* an HTTP field value list.  Returns 1 if found, 0 if not found.
*/
AP_DECLARE(int) ap_find_etag_weak(apr_pool_t *p, const char *line,
                                  const char *tok)
{
    return find_list_item(p, line, tok, AP_ETAG_WEAK);
}

/* Grab a list of tokens of the format 1#token (from RFC7230) */
AP_DECLARE(const char *) ap_parse_token_list_strict(apr_pool_t *p,
                                                const char *str_in,
                                                apr_array_header_t **tokens,
                                                int skip_invalid)
{
    int in_leading_space = 1;
    int in_trailing_space = 0;
    int string_end = 0;
    const char *tok_begin;
    const char *cur;

    if (!str_in) {
        return NULL;
    }

    tok_begin = cur = str_in;

    while (!string_end) {
        const unsigned char c = (unsigned char)*cur;

        if (!TEST_CHAR(c, T_HTTP_TOKEN_STOP)) {
            /* Non-separator character; we are finished with leading
             * whitespace. We must never have encountered any trailing
             * whitespace before the delimiter (comma) */
            in_leading_space = 0;
            if (in_trailing_space) {
                return "Encountered illegal whitespace in token";
            }
        }
        else if (c == ' ' || c == '\t') {
            /* "Linear whitespace" only includes ASCII CRLF, space, and tab;
             * we can't get a CRLF since headers are split on them already,
             * so only look for a space or a tab */
            if (in_leading_space) {
                /* We're still in leading whitespace */
                ++tok_begin;
            }
            else {
                /* We must be in trailing whitespace */
                ++in_trailing_space;
            }
        }
        else if (c == ',' || c == '\0') {
            if (!in_leading_space) {
                /* If we're out of the leading space, we know we've read some
                 * characters of a token */
                if (*tokens == NULL) {
                    *tokens = apr_array_make(p, 4, sizeof(char *));
                }
                APR_ARRAY_PUSH(*tokens, char *) =
                    apr_pstrmemdup((*tokens)->pool, tok_begin,
                                   (cur - tok_begin) - in_trailing_space);
            }
            /* We're allowed to have null elements, just don't add them to the
             * array */

            tok_begin = cur + 1;
            in_leading_space = 1;
            in_trailing_space = 0;
            string_end = (c == '\0');
        }
        else {
            /* Encountered illegal separator char */
            if (skip_invalid) {
                /* Skip to the next separator */
                const char *temp;
                temp = ap_strchr_c(cur, ',');
                if(!temp) {
                    temp = ap_strchr_c(cur, '\0');
                }

                /* Act like we haven't seen a token so we reset */
                cur = temp - 1;
                in_leading_space = 1;
                in_trailing_space = 0;
            }
            else {
                return apr_psprintf(p, "Encountered illegal separator "
                                    "'\\x%.2x'", (unsigned int)c);
            }
        }

        ++cur;
    }

    return NULL;
}

/* Scan a string for HTTP VCHAR/obs-text characters including HT and SP
* (as used in header values, for example, in RFC 7230 section 3.2)
* returning the pointer to the first non-HT ASCII ctrl character.
*/
AP_DECLARE(const char *) ap_scan_http_field_content(const char *ptr)
{
    for ( ; !TEST_CHAR(*ptr, T_HTTP_CTRLS); ++ptr) ;

    return ptr;
}

/* Scan a string for HTTP token characters, returning the pointer to
* the first non-token character.
*/
AP_DECLARE(const char *) ap_scan_http_token(const char *ptr)
{
    for ( ; !TEST_CHAR(*ptr, T_HTTP_TOKEN_STOP); ++ptr) ;

    return ptr;
}

/* Scan a string for visible ASCII (0x21-0x7E) or obstext (0x80+)
* and return a pointer to the first ctrl/space character encountered.
*/
AP_DECLARE(const char *) ap_scan_vchar_obstext(const char *ptr)
{
    for ( ; TEST_CHAR(*ptr, T_VCHAR_OBSTEXT); ++ptr) ;

    return ptr;
}

/* 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;

    /* Find first non-white byte */

    while (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;
    }

    token = apr_pstrmemdup(p, tok_start, ptr - tok_start);

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

    while (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 */
        while (*s && 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 (!ap_cstr_casecmpn((const char *)start_token, (const char *)tok,
                         s - start_token)) {
            return 1;
        }
        if (!*s) {
            return 0;
        }
    }
}

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

    if (!line)
        return NULL;

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

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

    if (ap_cstr_casecmpn(&line[lidx], tok, tlen) == 0) {
        return &line[lidx];
    }
   return NULL;
}

AP_DECLARE(int) ap_find_last_token(apr_pool_t *p, const char *line,
                                   const char *tok)
{
    return find_last_token(p, line, tok) != NULL;
}

AP_DECLARE(int) ap_is_chunked(apr_pool_t *p, const char *line)
{
    const char *s;

    if (!line)
        return 0;
    if (!ap_cstr_casecmp(line, "chunked")) {
        return 1;
    }

    s = find_last_token(p, line, "chunked");

    if (!s) return 0;

    /* eat spaces right-to-left to see what precedes "chunked" */
    while (--s > line) {
        if (*s != ' ') break;
    }

    /* found delim, or leading ws (input wasn't parsed by httpd as a header) */
    if (*s == ',' || *s == ' ') {
        return 1;
    }
    return 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)
        /*
         * Newlines to Win32/OS2 CreateProcess() are ill advised.
         * Convert them to spaces since they are effectively white
         * space to most applications
         */
        if (*s == '\r' || *s == '\n') {
             *d++ = ' ';
             continue;
         }
#endif

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

    return cmd;
}

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

#if !APR_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 /*APR_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 /*APR_CHARSET_EBCDIC*/
    return (digit);
}

/*
* Unescapes a URL, leaving reserved characters intact.
* Returns 0 on success, non-zero on error
* Failure is due to
*   bad % escape       returns HTTP_BAD_REQUEST
*
*   decoding %00 or a forbidden character returns HTTP_NOT_FOUND
*/

static int unescape_url(char *url, const char *forbid, const char *reserved,
                        unsigned int flags)
{
    const int keep_slashes = (flags & AP_UNESCAPE_URL_KEEP_SLASHES) != 0,
              forbid_slashes = (flags & AP_UNESCAPE_URL_FORBID_SLASHES) != 0,
              keep_unreserved = (flags & AP_UNESCAPE_URL_KEEP_UNRESERVED) != 0;
    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 {
                char decoded;
                decoded = x2c(y + 1);
                if ((decoded == '\0')
                    || (forbid_slashes && AP_IS_SLASH(decoded))
                    || (forbid && ap_strchr_c(forbid, decoded))) {
                    badpath = 1;
                    *x = decoded;
                    y += 2;
                }
                else if ((keep_unreserved && TEST_CHAR(decoded,
                                                       T_URI_UNRESERVED))
                         || (keep_slashes && AP_IS_SLASH(decoded))
                         || (reserved && ap_strchr_c(reserved, decoded))) {
                    *x++ = *y++;
                    *x++ = *y++;
                    *x = *y;
                }
                else {
                    *x = decoded;
                    y += 2;
                }
            }
        }
    }
    *x = '\0';
    if (badesc) {
        return HTTP_BAD_REQUEST;
    }
    else if (badpath) {
        return HTTP_NOT_FOUND;
    }
    else {
        return OK;
    }
}
AP_DECLARE(int) ap_unescape_url(char *url)
{
    /* Traditional */
    return unescape_url(url, AP_SLASHES, NULL, 0);
}
AP_DECLARE(int) ap_unescape_url_keep2f(char *url, int decode_slashes)
{
    /* AllowEncodedSlashes (corrected) */
    if (decode_slashes) {
        /* no chars reserved */
        return unescape_url(url, NULL, NULL, 0);
    } else {
        /* reserve (do not decode) encoded slashes */
        return unescape_url(url, NULL, AP_SLASHES, 0);
    }
}
AP_DECLARE(int) ap_unescape_url_ex(char *url, unsigned int flags)
{
    return unescape_url(url, NULL, NULL, flags);
}

#ifdef NEW_APIS
/* IFDEF these out until they've been thought through.
* Just a germ of an API extension for now
*/
AP_DECLARE(int) ap_unescape_url_proxy(char *url)
{
    /* leave RFC1738 reserved characters intact, * so proxied URLs
     * don't get mangled.  Where does that leave encoded '&' ?
     */
    return unescape_url(url, NULL, "/;?", 0);
}
AP_DECLARE(int) ap_unescape_url_reserved(char *url, const char *reserved)
{
    return unescape_url(url, NULL, reserved);
}
#endif

AP_DECLARE(int) ap_unescape_urlencoded(char *query)
{
    char *slider;

    /* replace plus with a space */
    if (query) {
        for (slider = query; *slider; slider++) {
            if (*slider == '+') {
                *slider = ' ';
            }
        }
    }

    /* unescape everything else */
    return unescape_url(query, NULL, NULL, 0);
}

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);
    }
}

AP_DECLARE(int) ap_unescape_all(char *url)
{
    return unescape_url(url, NULL, NULL, 0);
}

/* 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 prefix,
                                     unsigned char *where)
{
#if APR_CHARSET_EBCDIC
    what = apr_xlate_conv_byte(ap_hdrs_to_ascii, (unsigned char)what);
#endif /*APR_CHARSET_EBCDIC*/
    *where++ = prefix;
    *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_buffer(char *copy, const char *segment)
{
    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_escape_path_segment(apr_pool_t *p, const char *segment)
{
    return ap_escape_path_segment_buffer(apr_palloc(p, 3 * strlen(segment) + 1), segment);
}

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_DECLARE(char *) ap_escape_urlencoded_buffer(char *copy, const char *buffer)
{
    const unsigned char *s = (const unsigned char *)buffer;
    unsigned char *d = (unsigned char *)copy;
    unsigned c;

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

AP_DECLARE(char *) ap_escape_urlencoded(apr_pool_t *p, const char *buffer)
{
    return ap_escape_urlencoded_buffer(apr_palloc(p, 3 * strlen(buffer) + 1), buffer);
}

/* ap_escape_uri is now a macro for os_escape_path */

AP_DECLARE(char *) ap_escape_html2(apr_pool_t *p, const char *s, int toasc)
{
    apr_size_t i, j;
    char *x;

    /* first, count the number of extra characters */
    for (i = 0, j = 0; s[i] != '\0'; i++) {
        if (i + j > APR_SIZE_MAX - 6) {
            abort();
        }
        if (s[i] == '<' || s[i] == '>')
            j += 3;
        else if (s[i] == '&')
            j += 4;
        else if (s[i] == '"')
            j += 5;
        else if (toasc && !apr_isascii(s[i]))
            j += 5;
    }

    if (j == 0)
        return apr_pstrmemdup(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], "<", 4);
            j += 3;
        }
        else if (s[i] == '>') {
            memcpy(&x[j], ">", 4);
            j += 3;
        }
        else if (s[i] == '&') {
            memcpy(&x[j], "&", 5);
            j += 4;
        }
        else if (s[i] == '"') {
            memcpy(&x[j], """, 6);
            j += 5;
        }
        else if (toasc && !apr_isascii(s[i])) {
            char *esc = apr_psprintf(p, "&#%3.3d;", (unsigned char)s[i]);
            memcpy(&x[j], esc, 6);
            j += 5;
        }
        else
            x[j] = s[i];

    x[j] = '\0';
    return x;
}
AP_DECLARE(char *) ap_escape_logitem(apr_pool_t *p, const char *str)
{
    char *ret;
    unsigned char *d;
    const unsigned char *s;
    apr_size_t length, escapes = 0;

    if (!str) {
        return NULL;
    }

    /* Compute how many characters need to be escaped */
    s = (const unsigned char *)str;
    for (; *s; ++s) {
        if (TEST_CHAR(*s, T_ESCAPE_LOGITEM)) {
            escapes++;
        }
    }

    /* Compute the length of the input string, including NULL */
    length = s - (const unsigned char *)str + 1;

    /* Fast path: nothing to escape */
    if (escapes == 0) {
        return apr_pmemdup(p, str, length);
    }

    /* Each escaped character needs up to 3 extra bytes (0 --> \x00) */
    ret = apr_palloc(p, length + 3 * escapes);
    d = (unsigned char *)ret;
    s = (const unsigned char *)str;
    for (; *s; ++s) {
        if (TEST_CHAR(*s, T_ESCAPE_LOGITEM)) {
            *d++ = '\\';
            switch(*s) {
            case '\b':
                *d++ = 'b';
                break;
            case '\n':
                *d++ = 'n';
                break;
            case '\r':
                *d++ = 'r';
                break;
            case '\t':
                *d++ = 't';
                break;
            case '\v':
                *d++ = 'v';
                break;
            case '\\':
            case '"':
                *d++ = *s;
                break;
            default:
                c2x(*s, 'x', d);
                d += 3;
            }
        }
        else {
            *d++ = *s;
        }
    }
    *d = '\0';

    return ret;
}

AP_DECLARE(apr_size_t) ap_escape_errorlog_item(char *dest, const char *source,
                                               apr_size_t buflen)
{
    unsigned char *d, *ep;
    const unsigned char *s;

    if (!source || !buflen) { /* be safe */
        return 0;
    }

    d = (unsigned char *)dest;
    s = (const unsigned char *)source;
--> --------------------

--> maximum size reached

--> --------------------

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