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gnupg/jnlib/stringhelp.c

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/* stringhelp.c - standard string helper functions
* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005,
* 2006, 2007 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>
#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'))
/*
* 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.
*
*/
char *
make_basename(const char *filepath, const char *inputpath)
{
char *p;
#ifdef __riscos__
return riscos_make_basename(filepath, inputpath);
#endif
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);
}
/***************
* Extract from a given filename the path prepended to it.
* If their isn't a path prepended to the filename, a dot
* is returned ('.').
*
*/
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;
}
/****************
* Construct a filename from the NULL terminated list of parts.
* Tilde expansion is done here.
*/
char *
make_filename( const char *first_part, ... )
{
va_list arg_ptr ;
size_t n;
const char *s;
char *name, *home, *p;
va_start (arg_ptr, first_part);
n = strlen (first_part) + 1;
while ( (s = va_arg (arg_ptr, const char *)) )
n += strlen(s) + 1;
va_end(arg_ptr);
home = NULL;
if ( *first_part == '~' && first_part[1] == '/'
&& (home = getenv("HOME")) && *home )
n += strlen (home);
name = jnlib_xmalloc (n);
p = (home
? stpcpy (stpcpy (name,home), first_part + 1)
: stpcpy(name, first_part));
va_start (arg_ptr, first_part) ;
while ( (s = va_arg(arg_ptr, const char *)) )
p = stpcpy (stpcpy (p,"/"), s);
va_end(arg_ptr);
#ifdef HAVE_DRIVE_LETTERS
/* We better avoid mixing slashes and backslashes 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. */
if (strchr (name, '\\'))
{
for (p=name; *p; p++)
if (*p == '/')
*p = '\\';
}
#endif /*HAVE_DRIVE_LETTERS*/
return name;
}
int
compare_filenames (const char *a, const char *b)
{
/* ? check whether this is an absolute filename and resolve
symlinks? */
#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++)
{
/* Fixme: Check whether *p < 0xa0 is correct for utf8 encoding. */
if (*p < 0x20
|| (*p >= 0x7f && *p < 0xa0)
|| *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. */
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 ();
FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL, ec,
MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
strerr, DIM (strerr)-1, NULL);
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 it are also escaped. */
char *
percent_escape (const char *str, const char *extra)
{
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++;
ptr = jnlib_xmalloc (i + 2 * j + 1);
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;
}
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