stringhelp.c
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	/* stringhelp.c - standard string helper functions
	* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007,
	* 2008, 2009, 2010 Free Software Foundation, Inc.
	*
	* This file is part of JNLIB, which is a subsystem of GnuPG.
	*
	* JNLIB is free software; you can redistribute it and/or modify it
	* under the terms of either
	*
	* - the GNU Lesser General Public License as published by the Free
	* Software Foundation; either version 3 of the License, or (at
	* your option) any later version.
	*
	* or
	*
	* - the GNU General Public License as published by the Free
	* Software Foundation; either version 2 of the License, or (at
	* your option) any later version.
	*
	* or both in parallel, as here.
	*
	* JNLIB is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copies of the GNU General Public License
	* and the GNU Lesser General Public License along with this program;
	* if not, see <http://www.gnu.org/licenses/>.
	*/

	#include <config.h>
	#include <stdlib.h>
	#include <string.h>
	#include <stdarg.h>
	#include <ctype.h>
	#include <errno.h>
	#ifdef HAVE_PWD_H
	# include <pwd.h>
	#endif
	#include <unistd.h>
	#include <sys/types.h>
	#ifdef HAVE_W32_SYSTEM
	# include <windows.h>
	#endif

	#include "libjnlib-config.h"
	#include "utf8conv.h"
	#include "stringhelp.h"


	#define tohex_lower(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'a'))

	/* Sometimes we want to avoid mixing slashes and backslashes on W32
	and prefer backslashes. There is usual no problem with mixing
	them, however a very few W32 API calls can't grok plain slashes.
	Printing filenames with mixed slashes also looks a bit strange.
	This function has no effext on POSIX. */
	static inline char *
	change_slashes (char *name)
	{
	#ifdef HAVE_DOSISH_SYSTEM
	char *p;

	if (strchr (name, '\\'))
	{
	for (p=name; *p; p++)
	if (*p == '/')
	*p = '\\';
	}
	#endif /HAVE_DOSISH_SYSTEM/
	return name;
	}


	/*
	* Look for the substring SUB in buffer and return a pointer to that
	* substring in BUFFER or NULL if not found.
	* Comparison is case-insensitive.
	*/
	const char *
	memistr (const void buffer, size_t buflen, const char sub)
	{
	const unsigned char *buf = buffer;
	const unsigned char t = (const unsigned char )buffer;
	const unsigned char s = (const unsigned char )sub;
	size_t n = buflen;

	for ( ; n ; t++, n-- )
	{
	if ( toupper (t) == toupper (s) )
	{
	for ( buf=t++, buflen = n--, s++;
	n && toupper (t) == toupper (s); t++, s++, n-- )
	;
	if (!*s)
	return (const char*)buf;
	t = buf;
	s = (const unsigned char *)sub ;
	n = buflen;
	}
	}
	return NULL;
	}

	const char *
	ascii_memistr ( const void buffer, size_t buflen, const char sub )
	{
	const unsigned char *buf = buffer;
	const unsigned char t = (const unsigned char )buf;
	const unsigned char s = (const unsigned char )sub;
	size_t n = buflen;

	for ( ; n ; t++, n-- )
	{
	if (ascii_toupper (t) == ascii_toupper (s) )
	{
	for ( buf=t++, buflen = n--, s++;
	n && ascii_toupper (t) == ascii_toupper (s); t++, s++, n-- )
	;
	if (!*s)
	return (const char*)buf;
	t = (const unsigned char *)buf;
	s = (const unsigned char *)sub ;
	n = buflen;
	}
	}
	return NULL;
	}

	/* This function is similar to strncpy(). However it won't copy more
	than N - 1 characters and makes sure that a '\0' is appended. With
	N given as 0, nothing will happen. With DEST given as NULL, memory
	will be allocated using jnlib_xmalloc (i.e. if it runs out of core
	the function terminates). Returns DES or a pointer to the
	allocated memory.
	*/
	char *
	mem2str( char dest , const void src , size_t n )
	{
	char *d;
	const char *s;

	if( n ) {
	if( !dest )
	dest = jnlib_xmalloc( n ) ;
	d = dest;
	s = src ;
	for(n--; n && *s; n-- )
	d++ = s++;
	*d = '\0' ;
	}

	return dest ;
	}


	/****************
	* remove leading and trailing white spaces
	*/
	char *
	trim_spaces( char *str )
	{
	char string, p, *mark;

	string = str;
	/* find first non space character */
	for( p=string; p && isspace( (byte*)p ) ; p++ )
	;
	/* move characters */
	for( (mark = NULL); (string = p); string++, p++ )
	if( isspace( (byte)p ) ) {
	if( !mark )
	mark = string ;
	}
	else
	mark = NULL ;
	if( mark )
	mark = '\0' ; / remove trailing spaces */

	return str ;
	}

	/****************
	* remove trailing white spaces
	*/
	char *
	trim_trailing_spaces( char *string )
	{
	char p, mark;

	for( mark = NULL, p = string; *p; p++ ) {
	if( isspace( (byte)p ) ) {
	if( !mark )
	mark = p;
	}
	else
	mark = NULL;
	}
	if( mark )
	*mark = '\0' ;

	return string ;
	}


	unsigned
	trim_trailing_chars( byte line, unsigned len, const char trimchars )
	{
	byte p, mark;
	unsigned n;

	for(mark=NULL, p=line, n=0; n < len; n++, p++ ) {
	if( strchr(trimchars, *p ) ) {
	if( !mark )
	mark = p;
	}
	else
	mark = NULL;
	}

	if( mark ) {
	*mark = 0;
	return mark - line;
	}
	return len;
	}

	/****************
	* remove trailing white spaces and return the length of the buffer
	*/
	unsigned
	trim_trailing_ws( byte *line, unsigned len )
	{
	return trim_trailing_chars( line, len, " \t\r\n" );
	}

	size_t
	length_sans_trailing_chars (const unsigned char *line, size_t len,
	const char *trimchars )
	{
	const unsigned char p, mark;
	size_t n;

	for( mark=NULL, p=line, n=0; n < len; n++, p++ )
	{
	if (strchr (trimchars, *p ))
	{
	if( !mark )
	mark = p;
	}
	else
	mark = NULL;
	}

	if (mark)
	return mark - line;
	return len;
	}

	/*
	* Return the length of line ignoring trailing white-space.
	*/
	size_t
	length_sans_trailing_ws (const unsigned char *line, size_t len)
	{
	return length_sans_trailing_chars (line, len, " \t\r\n");
	}



	/*
	* Extract from a given path the filename component. This function
	* terminates the process on memory shortage.
	*/
	char *
	make_basename(const char filepath, const char inputpath)
	{
	#ifdef __riscos__
	return riscos_make_basename(filepath, inputpath);
	#else
	char *p;

	(void)inputpath; /* Only required for riscos. */

	if ( !(p=strrchr(filepath, '/')) )
	#ifdef HAVE_DOSISH_SYSTEM
	if ( !(p=strrchr(filepath, '\\')) )
	#endif
	#ifdef HAVE_DRIVE_LETTERS
	if ( !(p=strrchr(filepath, ':')) )
	#endif
	{
	return jnlib_xstrdup(filepath);
	}

	return jnlib_xstrdup(p+1);
	#endif
	}



	/*
	* Extract from a given filename the path prepended to it. If there
	* isn't a path prepended to the filename, a dot is returned ('.').
	* This function terminates the process on memory shortage.
	*/
	char *
	make_dirname(const char *filepath)
	{
	char *dirname;
	int dirname_length;
	char *p;

	if ( !(p=strrchr(filepath, '/')) )
	#ifdef HAVE_DOSISH_SYSTEM
	if ( !(p=strrchr(filepath, '\\')) )
	#endif
	#ifdef HAVE_DRIVE_LETTERS
	if ( !(p=strrchr(filepath, ':')) )
	#endif
	{
	return jnlib_xstrdup(".");
	}

	dirname_length = p-filepath;
	dirname = jnlib_xmalloc(dirname_length+1);
	strncpy(dirname, filepath, dirname_length);
	dirname[dirname_length] = 0;

	return dirname;
	}



	static char *
	get_pwdir (int xmode, const char *name)
	{
	char *result = NULL;
	#ifdef HAVE_PWD_H
	struct passwd *pwd = NULL;

	if (name)
	{
	#ifdef HAVE_GETPWNAM
	/* Fixme: We should use getpwnam_r if available. */
	pwd = getpwnam (name);
	#endif
	}
	else
	{
	#ifdef HAVE_GETPWUID
	/* Fixme: We should use getpwuid_r if available. */
	pwd = getpwuid (getuid());
	#endif
	}
	if (pwd)
	{
	if (xmode)
	result = jnlib_xstrdup (pwd->pw_dir);
	else
	result = jnlib_strdup (pwd->pw_dir);
	}
	#else /!HAVE_PWD_H/
	/* No support at all. */
	(void)xmode;
	(void)name;
	#endif /HAVE_PWD_H/
	return result;
	}

	static char *
	do_make_filename (int xmode, const char *first_part, va_list arg_ptr)
	{
	const char *argv[32];
	int argc;
	size_t n;
	int skip = 1;
	char *home_buffer = NULL;
	char name, home, *p;

	n = strlen (first_part) + 1;
	argc = 0;
	while ( (argv[argc] = va_arg (arg_ptr, const char *)) )
	{
	n += strlen (argv[argc]) + 1;
	if (argc >= DIM (argv)-1)
	{
	if (xmode)
	BUG ();
	jnlib_set_errno (EINVAL);
	return NULL;
	}
	argc++;
	}
	n++;

	home = NULL;
	if (*first_part == '~')
	{
	if (first_part[1] == '/' \|\| !first_part[1])
	{
	/* This is the "~/" or "~" case. */
	home = getenv("HOME");
	if (!home)
	home = home_buffer = get_pwdir (xmode, NULL);
	if (home && *home)
	n += strlen (home);
	}
	else
	{
	/* This is the "~username/" or "~username" case. */
	char *user;

	if (xmode)
	user = jnlib_xstrdup (first_part+1);
	else
	{
	user = jnlib_strdup (first_part+1);
	if (!user)
	return NULL;
	}
	p = strchr (user, '/');
	if (p)
	*p = 0;
	skip = 1 + strlen (user);

	home = home_buffer = get_pwdir (xmode, user);
	jnlib_free (user);
	if (home)
	n += strlen (home);
	else
	skip = 1;
	}
	}

	if (xmode)
	name = jnlib_xmalloc (n);
	else
	{
	name = jnlib_malloc (n);
	if (!name)
	{
	jnlib_free (home_buffer);
	return NULL;
	}
	}

	if (home)
	p = stpcpy (stpcpy (name, home), first_part + skip);
	else
	p = stpcpy (name, first_part);

	jnlib_free (home_buffer);

	for (argc=0; argv[argc]; argc++)
	p = stpcpy (stpcpy (p, "/"), argv[argc]);

	return change_slashes (name);
	}

	/* Construct a filename from the NULL terminated list of parts. Tilde
	expansion is done for the first argument. This function terminates
	the process on memory shortage. */
	char *
	make_filename (const char *first_part, ... )
	{
	va_list arg_ptr;
	char *result;

	va_start (arg_ptr, first_part);
	result = do_make_filename (1, first_part, arg_ptr);
	va_end (arg_ptr);
	return result;
	}

	/* Construct a filename from the NULL terminated list of parts. Tilde
	expansion is done for the first argument. This function may return
	NULL on error. */
	char *
	make_filename_try (const char *first_part, ... )
	{
	va_list arg_ptr;
	char *result;

	va_start (arg_ptr, first_part);
	result = do_make_filename (0, first_part, arg_ptr);
	va_end (arg_ptr);
	return result;
	}



	/* Compare whether the filenames are identical. This is a
	special version of strcmp() taking the semantics of filenames in
	account. Note that this function works only on the supplied names
	without considering any context like the current directory. See
	also same_file_p(). */
	int
	compare_filenames (const char a, const char b)
	{
	#ifdef HAVE_DOSISH_SYSTEM
	for ( ; a && b; a++, b++ )
	{
	if (a != b
	&& (toupper ((const unsigned char)a)
	!= toupper ((const unsigned char)b) )
	&& !((a == '/' && b == '\\') \|\| (a == '\\' && b == '/')))
	break;
	}
	if ((a == '/' && b == '\\') \|\| (a == '\\' && b == '/'))
	return 0;
	else
	return (toupper ((const unsigned char)a)
	- toupper ((const unsigned char)b));
	#else
	return strcmp(a,b);
	#endif
	}


	/* Convert 2 hex characters at S to a byte value. Return this value
	or -1 if there is an error. */
	int
	hextobyte (const char *s)
	{
	int c;

	if ( s >= '0' && s <= '9' )
	c = 16 * (*s - '0');
	else if ( s >= 'A' && s <= 'F' )
	c = 16 * (10 + *s - 'A');
	else if ( s >= 'a' && s <= 'f' )
	c = 16 * (10 + *s - 'a');
	else
	return -1;
	s++;
	if ( s >= '0' && s <= '9' )
	c += *s - '0';
	else if ( s >= 'A' && s <= 'F' )
	c += 10 + *s - 'A';
	else if ( s >= 'a' && s <= 'f' )
	c += 10 + *s - 'a';
	else
	return -1;
	return c;
	}


	/* Print a BUFFER to stream FP while replacing all control characters
	and the characters DELIM and DELIM2 with standard C escape
	sequences. Returns the number of characters printed. */
	size_t
	print_sanitized_buffer2 (FILE fp, const void buffer, size_t length,
	int delim, int delim2)
	{
	const unsigned char *p = buffer;
	size_t count = 0;

	for (; length; length--, p++, count++)
	{
	if (*p < 0x20
	\|\| *p == 0x7f
	\|\| *p == delim
	\|\| *p == delim2
	\|\| ((delim \|\| delim2) && *p=='\\'))
	{
	putc ('\\', fp);
	count++;
	if (*p == '\n')
	{
	putc ('n', fp);
	count++;
	}
	else if (*p == '\r')
	{
	putc ('r', fp);
	count++;
	}
	else if (*p == '\f')
	{
	putc ('f', fp);
	count++;
	}
	else if (*p == '\v')
	{
	putc ('v', fp);
	count++;
	}
	else if (*p == '\b')
	{
	putc ('b', fp);
	count++;
	}
	else if (!*p)
	{
	putc('0', fp);
	count++;
	}
	else
	{
	fprintf (fp, "x%02x", *p);
	count += 3;
	}
	}
	else
	{
	putc (*p, fp);
	count++;
	}
	}

	return count;
	}

	/* Same as print_sanitized_buffer2 but with just one delimiter. */
	size_t
	print_sanitized_buffer (FILE fp, const void buffer, size_t length,
	int delim)
	{
	return print_sanitized_buffer2 (fp, buffer, length, delim, 0);
	}


	size_t
	print_sanitized_utf8_buffer (FILE fp, const void buffer,
	size_t length, int delim)
	{
	const char *p = buffer;
	size_t i;

	/* We can handle plain ascii simpler, so check for it first. */
	for (i=0; i < length; i++ )
	{
	if ( (p[i] & 0x80) )
	break;
	}
	if (i < length)
	{
	char *buf = utf8_to_native (p, length, delim);
	/(utf8 conversion already does the control character quoting)/
	i = strlen (buf);
	fputs (buf, fp);
	jnlib_free (buf);
	return i;
	}
	else
	return print_sanitized_buffer (fp, p, length, delim);
	}


	size_t
	print_sanitized_string2 (FILE fp, const char string, int delim, int delim2)
	{
	return string? print_sanitized_buffer2 (fp, string, strlen (string),
	delim, delim2):0;
	}

	size_t
	print_sanitized_string (FILE fp, const char string, int delim)
	{
	return string? print_sanitized_buffer (fp, string, strlen (string), delim):0;
	}

	size_t
	print_sanitized_utf8_string (FILE fp, const char string, int delim)
	{
	return string? print_sanitized_utf8_buffer (fp,
	string, strlen (string),
	delim) : 0;
	}

	/* Create a string from the buffer P_ARG of length N which is suitable
	for printing. Caller must release the created string using xfree.
	This function terminates the process on memory shortage. */
	char *
	sanitize_buffer (const void *p_arg, size_t n, int delim)
	{
	const unsigned char *p = p_arg;
	size_t save_n, buflen;
	const unsigned char *save_p;
	char buffer, d;

	/* First count length. */
	for (save_n = n, save_p = p, buflen=1 ; n; n--, p++ )
	{
	if ( p < 0x20 \|\| p == 0x7f \|\| p == delim \|\| (delim && p=='\\'))
	{
	if ( p=='\n' \|\| p=='\r' \|\| *p=='\f'
	\|\| p=='\v' \|\| p=='\b' \|\| !*p )
	buflen += 2;
	else
	buflen += 5;
	}
	else
	buflen++;
	}
	p = save_p;
	n = save_n;
	/* And now make the string */
	d = buffer = jnlib_xmalloc( buflen );
	for ( ; n; n--, p++ )
	{
	if (p < 0x20 \|\| p == 0x7f \|\| p == delim \|\| (delim && p=='\\')) {
	*d++ = '\\';
	if( *p == '\n' )
	*d++ = 'n';
	else if( *p == '\r' )
	*d++ = 'r';
	else if( *p == '\f' )
	*d++ = 'f';
	else if( *p == '\v' )
	*d++ = 'v';
	else if( *p == '\b' )
	*d++ = 'b';
	else if( !*p )
	*d++ = '0';
	else {
	sprintf(d, "x%02x", *p );
	d += 3;
	}
	}
	else
	d++ = p;
	}
	*d = 0;
	return buffer;
	}


	/* Given a string containing an UTF-8 encoded text, return the number
	of characters in this string. It differs from strlen in that it
	only counts complete UTF-8 characters. Note, that this function
	does not take combined characters into account. */
	size_t
	utf8_charcount (const char *s)
	{
	size_t n;

	for (n=0; *s; s++)
	if ( (s&0xc0) != 0x80 ) / Exclude continuation bytes: 10xxxxxx */
	n++;

	return n;
	}


	/****************************************************
	******** W32 specific functions **************
	****************************************************/

	#ifdef HAVE_W32_SYSTEM
	const char *
	w32_strerror (int ec)
	{
	static char strerr[256];

	if (ec == -1)
	ec = (int)GetLastError ();
	#ifdef HAVE_W32CE_SYSTEM
	/* There is only a wchar_t FormatMessage. It does not make much
	sense to play the conversion game; we print only the code. */
	snprintf (strerr, sizeof strerr, "ec=%d", (int)GetLastError ());
	#else
	FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL, ec,
	MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
	strerr, DIM (strerr)-1, NULL);
	#endif
	return strerr;
	}
	#endif /HAVE_W32_SYSTEM/


	/****************************************************
	****** Locale insensitive ctype functions ******
	****************************************************/
	/* FIXME: replace them by a table lookup and macros */
	int
	ascii_isupper (int c)
	{
	return c >= 'A' && c <= 'Z';
	}

	int
	ascii_islower (int c)
	{
	return c >= 'a' && c <= 'z';
	}

	int
	ascii_toupper (int c)
	{
	if (c >= 'a' && c <= 'z')
	c &= ~0x20;
	return c;
	}

	int
	ascii_tolower (int c)
	{
	if (c >= 'A' && c <= 'Z')
	c \|= 0x20;
	return c;
	}


	int
	ascii_strcasecmp( const char a, const char b )
	{
	if (a == b)
	return 0;

	for (; a && b; a++, b++) {
	if (a != b && ascii_toupper(a) != ascii_toupper(b))
	break;
	}
	return a == b? 0 : (ascii_toupper (a) - ascii_toupper (b));
	}

	int
	ascii_strncasecmp (const char a, const char b, size_t n)
	{
	const unsigned char p1 = (const unsigned char )a;
	const unsigned char p2 = (const unsigned char )b;
	unsigned char c1, c2;

	if (p1 == p2 \|\| !n )
	return 0;

	do
	{
	c1 = ascii_tolower (*p1);
	c2 = ascii_tolower (*p2);

	if ( !--n \|\| c1 == '\0')
	break;

	++p1;
	++p2;
	}
	while (c1 == c2);

	return c1 - c2;
	}


	int
	ascii_memcasecmp (const void a_arg, const void b_arg, size_t n )
	{
	const char *a = a_arg;
	const char *b = b_arg;

	if (a == b)
	return 0;
	for ( ; n; n--, a++, b++ )
	{
	if( a != b && ascii_toupper (a) != ascii_toupper (b) )
	return a == b? 0 : (ascii_toupper (a) - ascii_toupper (b));
	}
	return 0;
	}

	int
	ascii_strcmp( const char a, const char b )
	{
	if (a == b)
	return 0;

	for (; a && b; a++, b++) {
	if (a != b )
	break;
	}
	return a == b? 0 : ((signed char )a - (signed char )b);
	}


	void *
	ascii_memcasemem (const void *haystack, size_t nhaystack,
	const void *needle, size_t nneedle)
	{

	if (!nneedle)
	return (void)haystack; / finding an empty needle is really easy */
	if (nneedle <= nhaystack)
	{
	const char *a = haystack;
	const char *b = a + nhaystack - nneedle;

	for (; a <= b; a++)
	{
	if ( !ascii_memcasecmp (a, needle, nneedle) )
	return (void *)a;
	}
	}
	return NULL;
	}

	/*********************************************
	******** missing string functions *******
	*********************************************/

	#ifndef HAVE_STPCPY
	char *
	stpcpy(char a,const char b)
	{
	while( *b )
	a++ = b++;
	*a = 0;

	return (char*)a;
	}
	#endif

	#ifndef HAVE_STRSEP
	/* Code taken from glibc-2.2.1/sysdeps/generic/strsep.c. */
	char *
	strsep (char *stringp, const char delim)
	{
	char begin, end;

	begin = *stringp;
	if (begin == NULL)
	return NULL;

	/* A frequent case is when the delimiter string contains only one
	character. Here we don't need to call the expensive `strpbrk'
	function and instead work using `strchr'. */
	if (delim[0] == '\0' \|\| delim[1] == '\0')
	{
	char ch = delim[0];

	if (ch == '\0')
	end = NULL;
	else
	{
	if (*begin == ch)
	end = begin;
	else if (*begin == '\0')
	end = NULL;
	else
	end = strchr (begin + 1, ch);
	}
	}
	else
	/* Find the end of the token. */
	end = strpbrk (begin, delim);

	if (end)
	{
	/* Terminate the token and set STRINGP past NUL character. /
	*end++ = '\0';
	*stringp = end;
	}
	else
	/* No more delimiters; this is the last token. */
	*stringp = NULL;

	return begin;
	}
	#endif /HAVE_STRSEP/


	#ifndef HAVE_STRLWR
	char *
	strlwr(char *s)
	{
	char *p;
	for(p=s; *p; p++ )
	p = tolower(p);
	return s;
	}
	#endif


	#ifndef HAVE_STRCASECMP
	int
	strcasecmp( const char a, const char b )
	{
	for( ; a && b; a++, b++ ) {
	if( a != b && toupper(a) != toupper(b) )
	break;
	}
	return (const byte)a - (const byte)b;
	}
	#endif


	/****************
	* mingw32/cpd has a memicmp()
	*/
	#ifndef HAVE_MEMICMP
	int
	memicmp( const char a, const char b, size_t n )
	{
	for( ; n; n--, a++, b++ )
	if( a != b && toupper((const byte)a) != toupper((const byte)b) )
	return (const byte )a - (const byte)b;
	return 0;
	}
	#endif


	#ifndef HAVE_MEMRCHR
	void *
	memrchr (const void *buffer, int c, size_t n)
	{
	const unsigned char *p = buffer;

	for (p += n; n ; n--)
	if (*--p == c)
	return (void *)p;
	return NULL;
	}
	#endif /HAVE_MEMRCHR/


	/* Percent-escape the string STR by replacing colons with '%3a'. If
	EXTRA is not NULL all characters in EXTRA are also escaped. */
	static char *
	do_percent_escape (const char str, const char extra, int die)
	{
	int i, j;
	char *ptr;

	if (!str)
	return NULL;

	for (i=j=0; str[i]; i++)
	if (str[i] == ':' \|\| str[i] == '%' \|\| (extra && strchr (extra, str[i])))
	j++;
	if (die)
	ptr = jnlib_xmalloc (i + 2 * j + 1);
	else
	{
	ptr = jnlib_malloc (i + 2 * j + 1);
	if (!ptr)
	return NULL;
	}
	i = 0;
	while (*str)
	{
	if (*str == ':')
	{
	ptr[i++] = '%';
	ptr[i++] = '3';
	ptr[i++] = 'a';
	}
	else if (*str == '%')
	{
	ptr[i++] = '%';
	ptr[i++] = '2';
	ptr[i++] = '5';
	}
	else if (extra && strchr (extra, *str))
	{
	ptr[i++] = '%';
	ptr[i++] = tohex_lower ((*str>>4)&15);
	ptr[i++] = tohex_lower (*str&15);
	}
	else
	ptr[i++] = *str;
	str++;
	}
	ptr[i] = '\0';

	return ptr;
	}

	/* Percent-escape the string STR by replacing colons with '%3a'. If
	EXTRA is not NULL all characters in EXTRA are also escaped. This
	function terminates the process on memory shortage. */
	char *
	percent_escape (const char str, const char extra)
	{
	return do_percent_escape (str, extra, 1);
	}

	/* Same as percent_escape but return NULL instead of exiting on memory
	error. */
	char *
	try_percent_escape (const char str, const char extra)
	{
	return do_percent_escape (str, extra, 0);
	}



	static char *
	do_strconcat (const char *s1, va_list arg_ptr)
	{
	const char *argv[48];
	size_t argc;
	size_t needed;
	char buffer, p;

	argc = 0;
	argv[argc++] = s1;
	needed = strlen (s1);
	while (((argv[argc] = va_arg (arg_ptr, const char *))))
	{
	needed += strlen (argv[argc]);
	if (argc >= DIM (argv)-1)
	{
	jnlib_set_errno (EINVAL);
	return NULL;
	}
	argc++;
	}
	needed++;
	buffer = jnlib_malloc (needed);
	if (buffer)
	{
	for (p = buffer, argc=0; argv[argc]; argc++)
	p = stpcpy (p, argv[argc]);
	}
	return buffer;
	}


	/* Concatenate the string S1 with all the following strings up to a
	NULL. Returns a malloced buffer with the new string or NULL on a
	malloc error or if too many arguments are given. */
	char *
	strconcat (const char *s1, ...)
	{
	va_list arg_ptr;
	char *result;

	if (!s1)
	result = jnlib_strdup ("");
	else
	{
	va_start (arg_ptr, s1);
	result = do_strconcat (s1, arg_ptr);
	va_end (arg_ptr);
	}
	return result;
	}

	/* Same as strconcat but terminate the process with an error message
	if something goes wrong. */
	char *
	xstrconcat (const char *s1, ...)
	{
	va_list arg_ptr;
	char *result;

	if (!s1)
	result = jnlib_xstrdup ("");
	else
	{
	va_start (arg_ptr, s1);
	result = do_strconcat (s1, arg_ptr);
	va_end (arg_ptr);
	}
	if (!result)
	{
	if (errno == EINVAL)
	fputs ("\nfatal: too many args for xstrconcat\n", stderr);
	else
	fputs ("\nfatal: out of memory\n", stderr);
	exit (2);
	}
	return result;
	}

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