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/* Removes leading and/or trailing whitespaces
Copyright (C) 2006-2021 Free Software Foundation, Inc.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Davide Angelocola <davide.angelocola@gmail.com> */
#include <config.h>
/* Specification. */
#include "trim.h"
#include <ctype.h>
#include <string.h>
#include <stddef.h>
#include <stdlib.h>
#include "mbchar.h"
#include "mbiter.h"
#include "xalloc.h"
/* Use this to suppress gcc's "...may be used before initialized" warnings. */
#if defined GCC_LINT || defined lint
# define IF_LINT(Code) Code
#else
# define IF_LINT(Code) /* empty */
#endif
char *
trim2 (const char *s, int how)
{
char *d;
d = strdup (s);
if (!d)
xalloc_die ();
if (MB_CUR_MAX > 1)
{
mbi_iterator_t i;
/* Trim leading whitespaces. */
if (how != TRIM_TRAILING)
{
mbi_init (i, d, strlen (d));
for (; mbi_avail (i) && mb_isspace (mbi_cur (i)); mbi_advance (i))
;
memmove (d, mbi_cur_ptr (i), strlen (mbi_cur_ptr (i)) + 1);
}
/* Trim trailing whitespaces. */
if (how != TRIM_LEADING)
{
unsigned int state = 0;
char *r IF_LINT (= NULL); /* used only while state = 2 */
mbi_init (i, d, strlen (d));
for (; mbi_avail (i); mbi_advance (i))
{
if (state == 0 && mb_isspace (mbi_cur (i)))
continue;
if (state == 0 && !mb_isspace (mbi_cur (i)))
{
state = 1;
continue;
}
if (state == 1 && !mb_isspace (mbi_cur (i)))
continue;
if (state == 1 && mb_isspace (mbi_cur (i)))
{
state = 2;
r = (char *) mbi_cur_ptr (i);
}
else if (state == 2 && mb_isspace (mbi_cur (i)))
{
/* empty */
}
else
{
state = 1;
}
}
if (state == 2)
*r = '\0';
}
}
else
{
char *p;
/* Trim leading whitespaces. */
if (how != TRIM_TRAILING)
{
for (p = d; *p && isspace ((unsigned char) *p); p++)
;
memmove (d, p, strlen (p) + 1);
}
/* Trim trailing whitespaces. */
if (how != TRIM_LEADING)
{
for (p = d + strlen (d) - 1;
p >= d && isspace ((unsigned char) *p); p--)
*p = '\0';
}
}
return d;
}
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