freeswitch/src/switch_utils.c

/* 
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Anthony Minessale II <anthmct@yahoo.com>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 * Anthony Minessale II <anthmct@yahoo.com>
 * Juan Jose Comellas <juanjo@comellas.org>
 *
 *
 * switch_utils.c -- Compatability and Helper Code
 *
 */
#include <switch.h>
#ifndef WIN32
#include <arpa/inet.h>
#endif
#include "private/switch_core_pvt.h"


SWITCH_DECLARE(char *) switch_find_end_paren(const char *s, char open, char close)
{
	const char *e = NULL;
	int depth = 0;
	
	while (s && *s && *s == ' ') {
		s++;
	}

	if (s && *s == open) {
		depth++;
		for (e = s + 1; e && *e; e++) {
			if (*e == open) {
				depth++;
			} else if (*e == close) {
				depth--;
				if (!depth) {
					break;
				}
			}
		}
	}

	return (char *)e;
}


SWITCH_DECLARE(switch_size_t) switch_fd_read_line(int fd, char *buf, switch_size_t len)
{
	char c, *p;
	int cur;
	switch_size_t total = 0;

	p = buf;
	while (total + 2 < len && (cur = read(fd, &c, 1)) == 1) {
		total += cur;
		*p++ = c;
		if (c == '\r' || c == '\n') {
			break;
		}
	}

	*p++ = '\0';
	assert(total < len);
	return total;
}

SWITCH_DECLARE(char *) switch_amp_encode(char *s, char *buf, switch_size_t len)
{
	char *p, *q;
	switch_size_t x = 0;
	switch_assert(s);

	q = buf;

	for(p = s; x < len; p++) {
		switch(*p) {
		case '<':
			if (x + 4 > len -1) {
				goto end;
			}
			*q++ = '&';
			*q++ = 'l';
			*q++ = 't';
			*q++ = ';';
			x += 4;
			break;
		case '>':
			if (x + 4 > len -1) {
				goto end;
			}
			*q++ = '&';
			*q++ = 'g';
			*q++ = 't';
			*q++ = ';';
			x += 4;
			break;
		default:
			if (x + 1 > len -1) {
				goto end;
			}
			*q++ = *p;
			x++;
			if (*p == '\0') {
				goto end;
			}
			break;
		}
	}

 end:

	return buf;
}


static const char switch_b64_table[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
#define B64BUFFLEN 1024
SWITCH_DECLARE(switch_status_t) switch_b64_encode(unsigned char *in, switch_size_t ilen, unsigned char *out, switch_size_t olen)
{
    int y = 0, bytes = 0;
    size_t x = 0;
    unsigned int b = 0,l = 0;

    for(x = 0; x < ilen; x++) {
        b = (b<<8) + in[x];
        l += 8;
        while (l >= 6) {
            out[bytes++] = switch_b64_table[(b>>(l-=6))%64];
            if(++y != 72) {
                continue;
            }
            //out[bytes++] = '\n';
            y=0;
        }
    }

    if (l > 0) {
        out[bytes++] = switch_b64_table[((b%16)<<(6-l))%64];
    }
    if (l != 0) {
		while (l < 6) {
			out[bytes++] = '=', l += 2;
		}
	}

    return SWITCH_STATUS_SUCCESS;
}


SWITCH_DECLARE(switch_size_t) switch_b64_decode(char *in, char *out, switch_size_t olen)
{

	char l64[256];
	int b = 0, c, l = 0, i;
	char *ip, *op = out;
	size_t ol = 0;

	for (i=0; i<256; i++) {
		l64[i] = -1;
	}

	for (i=0; i<64; i++) {
		l64[(int)switch_b64_table[i]] = (char)i;
	}

	for (ip = in; ip && *ip; ip++) {
		c = l64[(int)*ip];
		if (c == -1) {
			continue;
		}

		b = (b << 6) + c;
		l += 6;

		while (l >= 8) {
			op[ol++] = (char)((b >> (l -= 8)) % 256);
			if (ol >= olen -2) {
				goto end;
			}
		}
	}

 end:

	op[ol++] = '\0';

	return ol;
}


static int write_buf(int fd, const char *buf)
{

	int len = (int) strlen(buf);
	if (fd && write(fd, buf, len) != len) {
		close(fd);
		return 0;
	}

	return 1;
}

SWITCH_DECLARE(switch_bool_t) switch_simple_email(const char *to, const char *from, const char *headers, const char *body, const char *file)
{
	char *bound = "XXXX_boundary_XXXX";
	const char *mime_type = "audio/inline";
	char filename[80], buf[B64BUFFLEN];
	int fd = 0, ifd = 0;
	int x = 0, y = 0, bytes = 0, ilen = 0;
	unsigned int b = 0, l = 0;
	unsigned char in[B64BUFFLEN];
	unsigned char out[B64BUFFLEN + 512];

    switch_snprintf(filename, 80, "%smail.%d%04x", SWITCH_GLOBAL_dirs.temp_dir, (int)switch_timestamp(NULL), rand() & 0xffff);
    
    if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644))) {
        if (file) {
            if ((ifd = open(file, O_RDONLY)) < 1) {
                return SWITCH_FALSE;
            }

            switch_snprintf(buf, B64BUFFLEN, "MIME-Version: 1.0\nContent-Type: multipart/mixed; boundary=\"%s\"\n", bound);
            if (!write_buf(fd, buf)) {
                return SWITCH_FALSE;
            }
        }

        if (headers && !write_buf(fd, headers))
            return SWITCH_FALSE;

        if (!write_buf(fd, "\n\n"))
            return SWITCH_FALSE;

        if (file) {
			if (body && switch_stristr("content-type", body)) {
				switch_snprintf(buf, B64BUFFLEN, "--%s\n", bound);
			} else {
				switch_snprintf(buf, B64BUFFLEN, "--%s\nContent-Type: text/plain\n\n", bound);
			}
            if (!write_buf(fd, buf))
                return SWITCH_FALSE;
        }

        if (body) {
            if (!write_buf(fd, body)) {
                return SWITCH_FALSE;
            }
        }

        if (file) {
			const char *stipped_file = switch_cut_path(file);
			const char *new_type;
			char *ext;

			if ((ext = strrchr(stipped_file, '.'))) {
				ext++;
				if ((new_type = switch_core_mime_ext2type(ext))) {
					mime_type = new_type;
				}
			}

			switch_snprintf(buf, B64BUFFLEN,
					 "\n\n--%s\nContent-Type: %s; name=\"%s\"\n"
					 "Content-ID: <ATTACHED@freeswitch.org>\n"
					 "Content-Transfer-Encoding: base64\n"
					 "Content-Description: Sound attachment.\n"
					 "Content-Disposition: attachment; filename=\"%s\"\n\n",
					 bound, mime_type, stipped_file, stipped_file);
            if (!write_buf(fd, buf))
                return SWITCH_FALSE;

            while ((ilen = read(ifd, in, B64BUFFLEN))) {
                for (x = 0; x < ilen; x++) {
                    b = (b << 8) + in[x];
                    l += 8;
                    while (l >= 6) {
                        out[bytes++] = switch_b64_table[(b >> (l -= 6)) % 64];
                        if (++y != 72)
                            continue;
                        out[bytes++] = '\n';
                        y = 0;
                    }
                }
                if (write(fd, &out, bytes) != bytes) {
                    return -1;
                } else
                    bytes = 0;

            }

            if (l > 0) {
                out[bytes++] = switch_b64_table[((b % 16) << (6 - l)) % 64];
            }
            if (l != 0)
                while (l < 6) {
                    out[bytes++] = '=', l += 2;
                }
            if (write(fd, &out, bytes) != bytes) {
                return -1;
            }

        }



        if (file) {
            switch_snprintf(buf, B64BUFFLEN, "\n\n--%s--\n.\n", bound);
            if (!write_buf(fd, buf))
                return SWITCH_FALSE;
        }
    }

    if (fd) {
        close(fd);
    }
    if (ifd) {
        close(ifd);
    }
    switch_snprintf(buf, B64BUFFLEN, "/bin/cat %s | %s %s %s", filename, runtime.mailer_app, runtime.mailer_app_args, to);
    if(system(buf)) {
        switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Unable to execute command: %s\n", buf);
    }

	if (unlink(filename) != 0) {
		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "failed to delete file [%s]\n", filename);
	}


    if (file) {
        switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Emailed file [%s] to [%s]\n", filename, to);
    } else {
        switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Emailed data to [%s]\n", to);
    }

    return SWITCH_TRUE;
}

SWITCH_DECLARE(switch_bool_t) switch_is_lan_addr(const char *ip)
{
	if (switch_strlen_zero(ip)) return SWITCH_FALSE;

	return (
			strncmp(ip, "10.", 3) &&
			strncmp(ip, "192.168.", 8) &&
			strncmp(ip, "127.", 4) &&
			strncmp(ip, "255.", 4) &&
			strncmp(ip, "0.", 2) &&
			strncmp(ip, "1.", 2) &&
			strncmp(ip, "2.", 2) &&
			strncmp(ip, "172.16.", 7) &&
			strncmp(ip, "172.17.", 7) &&
			strncmp(ip, "172.18.", 7) &&
			strncmp(ip, "172.19.", 7) &&
			strncmp(ip, "172.2", 5) &&
			strncmp(ip, "172.30.", 7) &&
			strncmp(ip, "172.31.", 7) &&
			strncmp(ip, "192.0.2.", 8) &&
			strncmp(ip, "169.254.", 8)
			) ? SWITCH_FALSE : SWITCH_TRUE;
	
}

SWITCH_DECLARE(switch_bool_t) switch_ast2regex(char *pat, char *rbuf, size_t len)
{
	char *p = pat;

	if (!pat) {
		return SWITCH_FALSE;
	}

	memset(rbuf, 0, len);
	
	*(rbuf + strlen(rbuf)) = '^';

	while(p && *p) {
		if (*p == 'N') {
			strncat(rbuf, "[2-9]", len - strlen(rbuf));
		} else if (*p == 'X') {
			strncat(rbuf, "[0-9]", len - strlen(rbuf));
		} else if (*p == 'Z') {
			strncat(rbuf, "[1-9]", len - strlen(rbuf));
		} else if (*p == '.') {
			strncat(rbuf, ".*", len - strlen(rbuf));
		} else if (strlen(rbuf) < len - 1) {
			*(rbuf + strlen(rbuf)) = *p;
		}
		p++;
	}
	*(rbuf + strlen(rbuf)) = '$';

	return strcmp(pat,rbuf) ? SWITCH_TRUE : SWITCH_FALSE;
}

SWITCH_DECLARE(char *) switch_replace_char(char *str, char from, char to, switch_bool_t dup)
{
	char *p;

	if (dup) {
		p = strdup(str);
		switch_assert(p);
	} else {
		p = str;
	}

	for(;p && *p; p++) {
		if (*p == from) {
			*p = to;
		}
	}

	return p;
}

SWITCH_DECLARE(char *) switch_strip_spaces(const char *str)
{
	const char *sp = str;
	char *p, *s = NULL;
	
	while(sp && *sp && *sp == ' ') {
		sp++;
	}
	
	s = strdup(sp);

	p = s + (strlen(s) - 1);

	while(*p == ' ') {
		*p-- = '\0';
	}
	
	return s;
}


SWITCH_DECLARE(char *) switch_separate_paren_args(char *str)
{
	char *e, *args;
	switch_size_t br;

	if ((args = strchr(str, '('))) {
		e = args - 1;
		*args++ = '\0';
		while(*e == ' ') {
			*e-- = '\0';
		}
		e = args;
		br = 1;
		while(e && *e) {
			if (*e == '(') {
				br++;
			} else if (br > 1 && *e == ')') {
				br--;
			} else if (br == 1 && *e == ')') {
				*e = '\0';
				break;
			}
			e++;
		}
	}

	return args;
}

SWITCH_DECLARE(switch_bool_t) switch_is_number(const char *str)
{
	const char *p;
	switch_bool_t r = SWITCH_TRUE;

	for (p = str; p && *p; p++) {
		if (!(*p == '.' || (*p > 47 && *p < 58))) {
			r = SWITCH_FALSE;
			break;
		}
	}

	return r;
}


SWITCH_DECLARE(const char *) switch_stristr(const char *instr, const char *str)
{
/*
** Rev History:  16/07/97  Greg Thayer		Optimized
**               07/04/95  Bob Stout		ANSI-fy
**               02/03/94  Fred Cole		Original
**               09/01/03  Bob Stout		Bug fix (lines 40-41) per Fred Bulback
**
** Hereby donated to public domain.
*/

	const char *pptr, *sptr, *start;

	if (!str || !instr)
		return NULL;

	for (start = str; *start; start++) {
		/* find start of pattern in string */
		for ( ; ((*start) && (toupper(*start) != toupper(*instr))); start++);

		if (!*start)
			return NULL;

		pptr = instr;
		sptr = start;

		while (toupper(*sptr) == toupper(*pptr)) {
			sptr++;
			pptr++;

			/* if end of pattern then pattern was found */
			if (!*pptr)
				return (start);

			if (!*sptr)
				return NULL;
		}
	}
	return NULL;
}


SWITCH_DECLARE(switch_status_t) switch_find_local_ip(char *buf, int len, int family)
{
	switch_status_t status = SWITCH_STATUS_FALSE;
	char *base;

#ifdef WIN32
	SOCKET tmp_socket;
	SOCKADDR_STORAGE l_address;
	int l_address_len;
	struct addrinfo *address_info;
#else
#ifdef __Darwin__
	int ilen;
#else
	unsigned int ilen;
#endif
	int tmp_socket = -1, on = 1;
	char abuf[25] = "";
#endif

	switch_copy_string(buf, "127.0.0.1", len);

	switch (family) {
	case AF_INET:
		base = "82.45.148.209";
		break;
	case AF_INET6:
		base = "52.2d.94.d1";
		break;
	default:
		base = "127.0.0.1";
		break;
	}


#ifdef WIN32
	tmp_socket = socket(family, SOCK_DGRAM, 0);

	getaddrinfo(base, NULL, NULL, &address_info);

	if (!address_info || WSAIoctl(tmp_socket,
				 SIO_ROUTING_INTERFACE_QUERY,
				 address_info->ai_addr, (DWORD) address_info->ai_addrlen, &l_address, sizeof(l_address), (LPDWORD) & l_address_len, NULL, NULL)) {

		closesocket(tmp_socket);
		if (address_info)
			freeaddrinfo(address_info);
		return status;
	}

	closesocket(tmp_socket);
	freeaddrinfo(address_info);

	if (!getnameinfo((const struct sockaddr *) &l_address, l_address_len, buf, len, NULL, 0, NI_NUMERICHOST)) {

		status = SWITCH_STATUS_SUCCESS;

	}
#else

	switch (family) {
	case AF_INET:
		{
			struct sockaddr_in iface_out;
			struct sockaddr_in remote;
			memset(&remote, 0, sizeof(struct sockaddr_in));

			remote.sin_family = AF_INET;
			remote.sin_addr.s_addr = inet_addr(base);
			remote.sin_port = htons(4242);

			memset(&iface_out, 0, sizeof(iface_out));
			tmp_socket = socket(AF_INET, SOCK_DGRAM, 0);

			if (setsockopt(tmp_socket, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) == -1) {
				goto doh;
			}

			if (connect(tmp_socket, (struct sockaddr *) &remote, sizeof(struct sockaddr_in)) == -1) {
				goto doh;
			}

			ilen = sizeof(iface_out);
			if (getsockname(tmp_socket, (struct sockaddr *) &iface_out, &ilen) == -1) {
				goto doh;
			}

			if (iface_out.sin_addr.s_addr == 0) {
				goto doh;
			}

			switch_copy_string(buf, get_addr(abuf, sizeof(abuf), &iface_out.sin_addr), len);
			status = SWITCH_STATUS_SUCCESS;
		}
		break;
	case AF_INET6:
		{
			struct sockaddr_in6 iface_out;
			struct sockaddr_in6 remote;
			memset(&remote, 0, sizeof(struct sockaddr_in6));

			remote.sin6_family = AF_INET6;
			inet_pton(AF_INET6, buf, &remote.sin6_addr);
			remote.sin6_port = htons(4242);

			memset(&iface_out, 0, sizeof(iface_out));
			tmp_socket = socket(AF_INET6, SOCK_DGRAM, 0);

			if (setsockopt(tmp_socket, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) == -1) {
				goto doh;
			}

			if (connect(tmp_socket, (struct sockaddr *) &remote, sizeof(struct sockaddr_in)) == -1) {
				goto doh;
			}

			ilen = sizeof(iface_out);
			if (getsockname(tmp_socket, (struct sockaddr *) &iface_out, &ilen) == -1) {
				goto doh;
			}

			if (iface_out.sin6_addr.s6_addr == 0) {
				goto doh;
			}

			inet_ntop(AF_INET6, (const void *) &iface_out.sin6_addr, buf, len - 1);
			status = SWITCH_STATUS_SUCCESS;
		}
		break;
	}


  doh:
	if (tmp_socket > 0) {
		close(tmp_socket);
		tmp_socket = -1;
	}
#endif

	return status;

}


SWITCH_DECLARE(switch_time_t) switch_str_time(const char *in)
{
	switch_time_exp_t tm = { 0 };
	int proceed = 0, ovector[30];
	switch_regex_t *re = NULL;
	char replace[1024] = "";
	switch_time_t ret = 0;
	char *pattern = "^(\\d+)-(\\d+)-(\\d+)\\s*(\\d*):{0,1}(\\d*):{0,1}(\\d*)";

	switch_time_exp_lt(&tm, switch_timestamp_now());
	tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = 0;

	if ((proceed = switch_regex_perform(in, pattern, &re, ovector, sizeof(ovector) / sizeof(ovector[0])))) {

		if (proceed > 1) {
			switch_regex_copy_substring(in, ovector, proceed, 1, replace, sizeof(replace));
			tm.tm_year = atoi(replace) - 1900;
		}

		if (proceed > 2) {
			switch_regex_copy_substring(in, ovector, proceed, 2, replace, sizeof(replace));
			tm.tm_mon = atoi(replace) - 1;
		}

		if (proceed > 3) {
			switch_regex_copy_substring(in, ovector, proceed, 3, replace, sizeof(replace));
			tm.tm_mday = atoi(replace);
		}

		if (proceed > 4) {
			switch_regex_copy_substring(in, ovector, proceed, 4, replace, sizeof(replace));
			tm.tm_hour = atoi(replace);
		}

		if (proceed > 5) {
			switch_regex_copy_substring(in, ovector, proceed, 5, replace, sizeof(replace));
			tm.tm_min = atoi(replace);
		}

		if (proceed > 6) {
			switch_regex_copy_substring(in, ovector, proceed, 6, replace, sizeof(replace));
			tm.tm_sec = atoi(replace);
		}

		switch_time_exp_gmt_get(&ret, &tm);
		return ret;
	}
	/* possible else with more patterns later */
	return ret;

}

SWITCH_DECLARE(const char *) switch_priority_name(switch_priority_t priority)
{
	switch (priority) {			/*lol */
	case SWITCH_PRIORITY_NORMAL:
		return "NORMAL";
	case SWITCH_PRIORITY_LOW:
		return "LOW";
	case SWITCH_PRIORITY_HIGH:
		return "HIGH";
	default:
		return "INVALID";
	}
}

static char RFC2833_CHARS[] = "0123456789*#ABCDF";

#ifndef _MSC_VER
#define switch_inet_ntop inet_ntop
#else
/* Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <sys/types.h>

/*
 * WARNING: Don't even consider trying to compile this on a system where
 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
 */

static const char *switch_inet_ntop4(const unsigned char *src, char *dst, size_t size);
#if HAVE_SIN6
static const char *switch_inet_ntop6(const unsigned char *src, char *dst, size_t size);
#endif

/* char *
 * inet_ntop(af, src, dst, size)
 *	convert a network format address to presentation format.
 * return:
 *	pointer to presentation format address (`dst'), or NULL (see errno).
 * author:
 *	Paul Vixie, 1996.
 */
const char *
switch_inet_ntop(int af, void const *src, char *dst, size_t size)
{

	switch (af) {
	case AF_INET:
		return switch_inet_ntop4(src, dst, size);
#if HAVE_SIN6
	case AF_INET6:
		return switch_inet_ntop6(src, dst, size);
#endif
	default:
		return NULL;
	}
	/* NOTREACHED */
}

/* const char *
 * inet_ntop4(src, dst, size)
 *	format an IPv4 address, more or less like inet_ntoa()
 * return:
 *	`dst' (as a const)
 * notes:
 *	(1) uses no statics
 *	(2) takes a unsigned char* not an in_addr as input
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
switch_inet_ntop4(const unsigned char *src, char *dst, size_t size)
{
	static const char fmt[] = "%u.%u.%u.%u";
	char tmp[sizeof "255.255.255.255"];

	if (switch_snprintf(tmp, sizeof tmp, fmt,
		     src[0], src[1], src[2], src[3]) >= (int)size) {
		return NULL;
	}

	return strcpy(dst, tmp);
}

#if HAVE_SIN6
/* const char *
 * inet_ntop6(src, dst, size)
 *	convert IPv6 binary address into presentation (printable) format
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
switch_inet_ntop6(unsigned char const *src, char *dst, size_t size)
{
	/*
	 * Note that int32_t and int16_t need only be "at least" large enough
	 * to contain a value of the specified size.  On some systems, like
	 * Crays, there is no such thing as an integer variable with 16 bits.
	 * Keep this in mind if you think this function should have been coded
	 * to use pointer overlays.  All the world's not a VAX.
	 */
	char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
	struct { int base, len; } best = { -1 , 0 }, cur = { -1, 0 };
	unsigned int words[8];
	int i;

	/*
	 * Preprocess:
	 *	Copy the input (bytewise) array into a wordwise array.
	 *	Find the longest run of 0x00's in src[] for :: shorthanding.
	 */
	for (i = 0; i < 16; i += 2)
		words[i / 2] = (src[i] << 8) | (src[i + 1]);
	best.base = -1;
	cur.base = -1;
	for (i = 0; i < 8; i++) {
		if (words[i] == 0) {
			if (cur.base == -1)
				cur.base = i, cur.len = 1;
			else
				cur.len++;
		} else {
			if (cur.base != -1) {
				if (best.base == -1 || cur.len > best.len)
					best = cur;
				cur.base = -1;
			}
		}
	}
	if (cur.base != -1) {
		if (best.base == -1 || cur.len > best.len)
			best = cur;
	}
	if (best.base != -1 && best.len < 2)
		best.base = -1;

	/*
	 * Format the result.
	 */
	tp = tmp;
	for (i = 0; i < 8; i++) {
		/* Are we inside the best run of 0x00's? */
		if (best.base != -1 && i >= best.base &&
		    i < (best.base + best.len)) {
			if (i == best.base)
				*tp++ = ':';
			continue;
		}
		/* Are we following an initial run of 0x00s or any real hex? */
		if (i != 0)
			*tp++ = ':';
		/* Is this address an encapsulated IPv4? */
		if (i == 6 && best.base == 0 &&
		    (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
			if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
				return (NULL);
			tp += strlen(tp);
			break;
		}
		tp += sprintf(tp, "%x", words[i]);
	}
	/* Was it a trailing run of 0x00's? */
	if (best.base != -1 && (best.base + best.len) == 8)
		*tp++ = ':';
	*tp++ = '\0';

	/*
	 * Check for overflow, copy, and we're done.
	 */
	if ((size_t)(tp - tmp) >= size) {
		return NULL;
	}

	return strcpy(dst, tmp);
}
#endif

#endif

SWITCH_DECLARE(char *) get_addr(char *buf, switch_size_t len, struct in_addr *in)
{
	switch_assert(buf);
	*buf = '\0';
	if (in) {
		switch_inet_ntop(AF_INET, in, buf, len);
	}
	return buf;
}

SWITCH_DECLARE(char) switch_rfc2833_to_char(int event)
{
	if (event > -1 && event < (int32_t) sizeof(RFC2833_CHARS)) {
		return RFC2833_CHARS[event];
	}
	return '\0';
}

SWITCH_DECLARE(unsigned char) switch_char_to_rfc2833(char key)
{
	char *c;
	unsigned char counter = 0;

	key = (char) toupper(key);
	for (c = RFC2833_CHARS; *c; c++) {
		if (*c == key) {
			return counter;
		}
		counter++;
	}
	return '\0';
}

SWITCH_DECLARE(char *) switch_escape_char(switch_memory_pool_t *pool, char *in, const char *delim, char esc)
{
	char *data;
	const char *p, *d;
	int count = 1, i = 0;

	p = in;
	while (*p) {
		d = delim;
		while (*d) {
			if (*p == *d) {
				count++;
			}
			d++;
		}
		p++;
	}

	if (count == 1) {
		return in;
	}

	data = switch_core_alloc(pool, strlen(in) + count);

	p = in;
	while (*p) {
		d = delim;
		while (*d) {
			if (*p == *d) {
				data[i++] = esc;
			}
			d++;
		}
		data[i++] = *p;
		p++;
	}
	return data;
}

/* Helper function used when separating strings to unescape a character. The
   supported characters are:

   \n  linefeed
   \r  carriage return
   \t  tab
   \s  space

   Any other character is returned as it was received. */
static char unescape_char(char escaped)
{
	char unescaped;
	
	switch (escaped) {
		case 'n':
			unescaped = '\n';
			break;
		case 'r':
			unescaped = '\r';
			break;
		case 't':
			unescaped = '\t';
			break;
		case 's':
			unescaped = ' ';
			break;
		default:
			unescaped = escaped;
	}
	return unescaped;
}

/* Helper function used when separating strings to remove quotes, leading /
   trailing spaces, and to convert escaped characters. */
static char *cleanup_separated_string(char *str)
{
	char *ptr;
	char *dest;
	char *start;
	char *end = NULL;
	int inside_quotes = 0;

	/* Skip initial whitespace */
	for (ptr = str; *ptr == ' '; ++ptr) {
	}

	for (start = dest = ptr; *ptr; ++ptr) {
		if (*ptr == '\\') {
			++ptr;
			*dest++ = unescape_char(*ptr);
			end = dest;
		} else if (*ptr == '\'') {
			inside_quotes = (1 - inside_quotes);
		} else {
			*dest++ = *ptr;
			if (*ptr != ' ' || inside_quotes) {
				end = dest;
			}
		}
	}
	if (end) {
		*end = '\0';
	}
	return start;
}

/* Separate a string using a delimiter that is not a space */
static unsigned int separate_string_char_delim(char *buf, char delim, char **array, int arraylen)
{
	enum tokenizer_state {
		START,
		FIND_DELIM
	} state = START;

	unsigned int count = 0;
	char *ptr = buf;
	int  inside_quotes = 0;
	int i;
	
	while (*ptr && count < arraylen) {
		switch (state) {
			case START:
				array[count++] = ptr;
				state = FIND_DELIM;
				break;

			case FIND_DELIM:
				/* escaped characters are copied verbatim to the destination string */
				if (*ptr == '\\') {
					++ptr;
				} else if (*ptr == '\'') {
					inside_quotes = (1 - inside_quotes);
				} else if (*ptr == delim && !inside_quotes) {
					*ptr = '\0';
					state = START;
				}
				++ptr;
				break;
		}
	}
	/* strip quotes, escaped chars and leading / trailing spaces */
	for (i = 0; i < count; ++i) {
		array[i] = cleanup_separated_string(array[i]);
	}
	return count;
}

/* Separate a string using a delimiter that is a space */
static unsigned int separate_string_blank_delim(char *buf, char **array, int arraylen)
{
	enum tokenizer_state {
		START,
		SKIP_INITIAL_SPACE,
		FIND_DELIM,
		SKIP_ENDING_SPACE
	} state = START;

	unsigned int count = 0;
	char *ptr = buf;
	int  inside_quotes = 0;
	int i;

	while (*ptr && count < arraylen) {
		switch (state) {
			case START:
				array[count++] = ptr;
				state = SKIP_INITIAL_SPACE;
				break;

			case SKIP_INITIAL_SPACE:
				if (*ptr == ' ') {
					++ptr;
				} else {
					state = FIND_DELIM;
				}
				break;

			case FIND_DELIM:
				if (*ptr == '\\') {
					++ptr;
				} else if (*ptr == '\'') {
					inside_quotes = (1 - inside_quotes);
				} else if (*ptr == ' ' && !inside_quotes) {
					*ptr = '\0';
					state = SKIP_ENDING_SPACE;
				}
				++ptr;
				break;

			case SKIP_ENDING_SPACE:
				if (*ptr == ' ') {
					++ptr;
				} else {
					state = START;
				}
				break;
		}
	}
	/* strip quotes, escaped chars and leading / trailing spaces */
	for (i = 0; i < count; ++i) {
		array[i] = cleanup_separated_string(array[i]);
	}
	return count;
}

SWITCH_DECLARE(unsigned int) switch_separate_string(char *buf, char delim, char **array, int arraylen)
{
	if (!buf || !array || !arraylen) {
		return 0;
	}

	memset(array, 0, arraylen * sizeof (*array));

	return (delim == ' ' ?
			separate_string_blank_delim(buf, array, arraylen) :
			separate_string_char_delim(buf, delim, array, arraylen));
}

SWITCH_DECLARE(const char *) switch_cut_path(const char *in)
{
	const char *p, *ret = in;
	const char delims[] = "/\\";
	const char *i;

	if (in) {
		for (i = delims; *i; i++) {
			p = in;
			while ((p = strchr(p, *i)) != 0) {
				ret = ++p;
			}
		}
		return ret;
	} else {
		return NULL;
	}
}


SWITCH_DECLARE(switch_status_t) switch_string_match(const char *string, size_t string_len, const char *search, size_t search_len)
{
	size_t i;

	for (i = 0; (i < search_len) && (i < string_len); i++) {
		if (string[i] != search[i]) {
			return SWITCH_STATUS_FALSE;
		}
	}

	if (i == search_len) {
		return SWITCH_STATUS_SUCCESS;
	}

	return SWITCH_STATUS_FALSE;
}

SWITCH_DECLARE(char *) switch_string_replace(const char *string, const char *search, const char *replace)
{
	size_t string_len = strlen(string);
	size_t search_len = strlen(search);
	size_t replace_len = strlen(replace);
	size_t i, n;
	size_t dest_len = 0;
	char *dest, *tmp;

	dest = (char *) malloc(sizeof(char));
	switch_assert(dest);

	for (i = 0; i < string_len; i++) {
		if (switch_string_match(string + i, string_len - i, search, search_len) == SWITCH_STATUS_SUCCESS) {
			for (n = 0; n < replace_len; n++) {
				dest[dest_len] = replace[n];
				dest_len++;
				tmp = (char *) realloc(dest, sizeof(char) * (dest_len + 1));
				switch_assert(tmp);
				dest = tmp;
			}
			i += search_len - 1;
		} else {
			dest[dest_len] = string[i];
			dest_len++;
			tmp = (char *) realloc(dest, sizeof(char) * (dest_len + 1));
			switch_assert(tmp);
			dest = tmp;
		}
	}

	dest[dest_len] = 0;
	return dest;
}

SWITCH_DECLARE(int) switch_socket_waitfor(switch_pollfd_t * poll, int ms)
{
	int nsds = 0;

	switch_poll(poll, 1, &nsds, ms);

	return nsds;
}


SWITCH_DECLARE(size_t) switch_url_encode(const char *url, char *buf, size_t len)
{
	const char *p;
	size_t x = 0;
	const char urlunsafe[] = "\r\n \"#%&+:;<=>?@[\\]^`{|}";
	const char hex[] = "0123456789ABCDEF";

	if (!buf) {
		return 0;
	}

	memset(buf, 0, len);

	if (!url) {
		return 0;
	}

	for (p = url; *p; p++) {
		if (*p < ' ' || *p > '~' || strchr(urlunsafe, *p)) {
			if ((x + 3) > len) {
				break;
			}
			buf[x++] = '%';
			buf[x++] = hex[*p >> 4];
			buf[x++] = hex[*p & 0x0f];
		} else {
			buf[x++] = *p;
		}
		if (x == len) {
			break;
		}
	}
	return x;
}

SWITCH_DECLARE(char *) switch_url_decode(char *s)
{
	char *o;
	unsigned int tmp;

	for (o = s; *s; s++, o++) {
		if (*s == '%' && strlen(s) > 2 && sscanf(s + 1, "%2x", &tmp) == 1) {
			*o = (char) tmp;
			s += 2;
		} else {
			*o = *s;
		}
	}
	*o = '\0';
	return s;
}


/* For Emacs:
 * Local Variables:
 * mode:c
 * indent-tabs-mode:t
 * tab-width:4
 * c-basic-offset:4
 * End:
 * For VIM:
 * vim:set softtabstop=4 shiftwidth=4 tabstop=4 expandtab:
 */