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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2016-2025 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils 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 copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <mailutils/cstr.h>
#include <mailutils/errno.h>
/* Copy characters from IN to OUT. Replace each occurrences of backslash
followed by a character XTAB[i] with CHR[i].
OUT should be large enough to accommodate the translated string (same length
as IN, in the worst case). It is OK if IN==OUT.
Both XTAB and CHR must not be NULL and must contain the same number of
elements.
*/
static void
c_str_unescape (char const *in, char *out, char const *chr, char const *xtab)
{
size_t i, j;
for (i = j = 0; in[i]; i++, j++)
{
if (in[i] == '\\')
break;
out[j] = in[i];
}
if (in[i])
{
for (; in[i]; i++, j++)
{
if (in[i] == '\\')
{
char *p;
if (in[i+1] && (p = strchr (xtab, in[i+1])) != NULL)
{
out[j] = chr[p - xtab];
i++;
continue;
}
}
out[j] = in[i];
}
}
out[j] = 0;
}
/* Modifies STR, by replacing each occurrence of \ followed by a character
XTAB[i] with CHR[i].
Either XTAB or CHR can be NULL, in which case XTAB=CHR is assumed.
If both XTAB and CHR are NULL, STR is unchanged.
STR == NULL is OK.
Returns 0 success, and EINVAL if lengths of CHR and XTAB differ.
*/
int
mu_c_str_unescape_inplace (char *str, char const *chr, char const *xtab)
{
if (!str)
return 0;
if (!xtab)
{
if (chr)
xtab = chr;
else
return 0;
}
else if (!chr)
chr = xtab;
else if (strlen (chr) != strlen (xtab))
return EINVAL;
c_str_unescape (str, str, chr, xtab);
return 0;
}
/* A counterpart of mu_c_str_escape. Creates an allocated (using malloc(3))
copy of STR, where each occurrence of \ followed by a character XTAB[i]
is replaced with single character CHR[i].
Either XTAB or CHR can be NULL, in which case XTAB=CHR is assumed.
If both XTAB and CHR are NULL, the result is *RET_STR will contain exact
malloc'ed copy of STR.
STR == NULL is OK: in that case *RET_STR will also be NULL.
Returns 0 success, EINVAL if lengths of CHR and XTAB differ,
MU_ERR_OUT_PTR_NULL if RET_STR is NULL, and ENOMEM if memory allocation
failed.
*/
int
mu_c_str_unescape (char const *str, char const *chr, char const *xtab,
char **ret_str)
{
char *newstr;
size_t i, size;
if (!ret_str)
return MU_ERR_OUT_PTR_NULL;
if (!str)
{
*ret_str = NULL;
return 0;
}
if (!xtab)
{
if (chr)
xtab = chr;
else
{
char *p = strdup (str);
if (!p)
return errno;
*ret_str = p;
}
}
else if (!chr)
chr = xtab;
else if (strlen (chr) != strlen (xtab))
return EINVAL;
size = 0;
for (i = 0; str[i]; i++)
{
if (str[i] == '\\' && str[i + 1] && strchr (xtab, str[i + 1]))
i++;
size++;
}
newstr = malloc (size + 1);
if (!newstr)
return errno;
*ret_str = newstr;
c_str_unescape (str, newstr, chr, xtab);
return 0;
}
/* A counterpart of mu_c_str_escape_trans.
Creates an allocated (using malloc(3)) copy of STR, where each occurrence
of \ followed by TRANS[i] is replaced by TRANS[i+1].
Returns 0 on success, or error code if an error occurred.
See also mu_wordsplit_c_escape_tab in wordsplit.c
*/
int
mu_c_str_unescape_trans (char const *str, char const *trans, char **ret_str)
{
char *chr, *xtab;
size_t n, i;
int rc;
if (trans)
{
n = strlen (trans);
if (n % 2)
return EINVAL;
chr = malloc (n + 2);
if (!chr)
return errno;
xtab = chr + n / 2 + 1;
for (i = 0; i < n; i += 2)
{
chr[i / 2] = trans[i + 1];
xtab[i / 2] = trans[i];
}
chr[i / 2] = xtab[i / 2] = 0;
}
else
{
chr = xtab = NULL;
}
rc = mu_c_str_unescape (str, chr, xtab, ret_str);
free (chr);
return rc;
}
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