Merged jnlib into common.

1 files changed, 1151 insertions, 0 deletions

diff --git a/common/stringhelp.c b/common/stringhelp.c
new file mode 100644
index 000000000..36f96b8ff
--- /dev/null
+++ b/common/stringhelp.c
@@ -0,0 +1,1151 @@
+/* stringhelp.c -  standard string helper functions
+ * Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005,
+ *               2006, 2007, 2008, 2009  Free Software Foundation, Inc.
+ *
+ * This file is part of JNLIB.
+ *
+ * JNLIB is free software; you can redistribute it and/or modify it
+ * under the terms of 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.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of 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_DRIVE_LETTERS
+  char *p;
+
+  if (strchr (name, '\\'))
+    {
+      for (p=name; *p; p++)
+        if (*p == '/')
+          *p = '\\';
+    }
+#endif /*HAVE_DRIVE_LETTERS*/
+  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_DRIVE_LETTERS
+	if ( !(p=strrchr(filepath, '\\')) )
+	    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_DRIVE_LETTERS
+	if ( !(p=strrchr(filepath, '\\')) )
+	    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 considereing any context like the current directory.  See
+   also same_file_p(). */
+int
+compare_filenames (const char *a, const char *b)
+{
+#ifdef HAVE_DRIVE_LETTERS
+  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;
+}
+