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/*
* Copyright (c) 2020 Proofpoint, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#include <sm/gen.h>
#include <sm/sendmail.h>
#include <ctype.h>
#include <sm/string.h>
#include <sm/heap.h>
#if USE_EAI
# include <sm/limits.h>
# include <unicode/ucasemap.h>
# include <unicode/ustring.h>
# include <unicode/uchar.h>
# include <sm/ixlen.h>
/*
** ASCIISTR -- check whether a string is printable ASCII
**
** Parameters:
** str -- string
**
** Returns:
** TRUE iff printable ASCII
*/
bool
asciistr(str)
const char *str;
{
unsigned char ch;
if (str == NULL)
return true;
while ((ch = (unsigned char)*str) != '\0' && ch >= 32 && ch < 127)
str++;
return ch == '\0';
}
/*
** ASCIINSTR -- check whether a string is printable ASCII up to len
**
** Parameters:
** str -- string
** len -- length to check
**
** Returns:
** TRUE iff printable ASCII
*/
bool
asciinstr(str, len)
const char *str;
size_t len;
{
unsigned char ch;
int n;
if (str == NULL)
return true;
SM_REQUIRE(len < INT_MAX);
n = 0;
while (n < len && (ch = (unsigned char)*str) != '\0'
&& ch >= 32 && ch < 127)
{
n++;
str++;
}
return n == len || ch == '\0';
}
#endif /* USE_EAI */
/*
** MAKELOWER -- Translate a line into lower case
**
** Parameters:
** p -- string to translate (modified in place if possible). [A]
**
** Returns:
** lower cased string
**
** Side Effects:
** String p is translated to lower case if possible.
*/
char *
makelower(p)
char *p;
{
char c;
char *orig;
if (p == NULL)
return p;
orig = p;
#if USE_EAI
if (!asciistr(p))
return (char *)sm_lowercase(p);
#endif
for (; (c = *p) != '\0'; p++)
if (isascii(c) && isupper(c))
*p = tolower(c);
return orig;
}
#if USE_EAI
/*
** SM_LOWERCASE -- lower case a UTF-8 string
** Note: this should ONLY be applied to a UTF-8 string,
** i.e., the caller should check first if it isn't an ASCII string.
**
** Parameters:
** str -- original string
**
** Returns:
** lower case version of string [S]
**
** How to return an error description due to failed unicode calls?
** However, is that even relevant?
*/
char *
sm_lowercase(str)
const char *str;
{
int olen, ilen;
UErrorCode error;
ssize_t req;
int n;
static UCaseMap *csm = NULL;
static char *out = NULL;
static int outlen = 0;
# if SM_CHECK_REQUIRE
if (sm_debug_active(&SmExpensiveRequire, 3))
SM_REQUIRE(!asciistr(str));
# endif
/* an empty string is always ASCII */
SM_REQUIRE(NULL != str && '\0' != *str);
if (NULL == csm)
{
error = U_ZERO_ERROR;
csm = ucasemap_open("en_US", U_FOLD_CASE_DEFAULT, &error);
if (U_SUCCESS(error) == 0)
{
/* syserr("ucasemap_open error: %s", u_errorName(error)); */
return NULL;
}
}
ilen = strlen(str);
olen = ilen + 1;
if (olen > outlen)
{
outlen = olen;
out = sm_realloc_x(out, outlen);
}
for (n = 0; n < 3; n++)
{
error = U_ZERO_ERROR;
req = ucasemap_utf8FoldCase(csm, out, olen, str, ilen, &error);
if (U_SUCCESS(error))
{
if (req >= olen)
{
outlen = req + 1;
out = sm_realloc_x(out, outlen);
out[req] = '\0';
}
break;
}
else if (error == U_BUFFER_OVERFLOW_ERROR)
{
outlen = req + 1;
out = sm_realloc_x(out, outlen);
olen = outlen;
}
else
{
/* syserr("conversion error for \"%s\": %s", str, u_errorName(error)); */
return NULL;
}
}
return out;
}
#endif /* USE_EAI */
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