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/* compat.c - Simple compatibility functions
* Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc.
*
* The origin of this code is GnuPG.
*
* This file is free software; as a special exception the author gives
* unlimited permission to copy and/or distribute it, with or without
* modifications, as long as this notice is preserved.
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* History:
* 2006-09-28 dshaw Created. Added function hextobyte from GnuPG.
* 2007-04-16 dshaw Added ascii_toupper, ascii_tolower, ascii_strcasecmp,
* ascii_strncasecmp from GnuPG.
* 2009-08-25 wk License changed by GnuPG maintainer from GPL with
* OpenSSL exception to this all permissive license.
* 2009-08-25 wk Wrote new function xstrconcat.
*/
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
/* We require an external malloc function named xtrymalloc. */
void *xtrymalloc (size_t n);
#ifndef DIM
#define DIM(v) (sizeof(v)/sizeof((v)[0]))
#endif
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;
}
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)
{
const unsigned char *p1 = (const unsigned char *)a;
const unsigned char *p2 = (const unsigned char *)b;
unsigned char c1, c2;
if (p1 == p2)
return 0;
do
{
c1 = ascii_tolower (*p1);
c2 = ascii_tolower (*p2);
if (c1 == '\0')
break;
++p1;
++p2;
}
while (c1 == c2);
return c1 - c2;
}
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;
}
static char *
do_strconcat (const char *s1, va_list arg_ptr)
{
const char *argv[48];
size_t argc;
size_t needed;
char *buffer, *p;
const char *r;
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)
{
errno = EINVAL;
return NULL;
}
argc++;
}
needed++;
buffer = xtrymalloc (needed);
if (buffer)
{
for (p = buffer, argc=0; argv[argc]; argc++)
{
for (r = argv[argc]; *r; )
*p++ = *r++;
*p = 0;
}
}
return buffer;
}
/* Concatenate the string S1 with all the following strings up to a
NULL. Returns a malloced buffer. */
char *
xstrconcat (const char *s1, ...)
{
va_list arg_ptr;
char *result;
if (!s1)
{
result = xtrymalloc (1);
if (result)
*result = 0;
}
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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