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/* Removes leading and/or trailing whitespaces
Copyright (C) 2006-2024 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>
#if GNULIB_MCEL_PREFER
# include "mcel.h"
#else
# include "mbchar.h"
# include "mbuiterf.h"
#endif
#include "xalloc.h"
char *
trim2 (const char *s, int how)
{
const char *start = s;
const char *end;
if (MB_CUR_MAX > 1)
{
#if GNULIB_MCEL_PREFER
/* Skip leading whitespace. */
if (how != TRIM_TRAILING)
for (mcel_t g; *start; start += g.len)
{
g = mcel_scanz (start);
if (!c32isspace (g.ch))
break;
}
/* Find start of any trailing whitespace. */
if (how != TRIM_LEADING)
for (const char *p = end = start; *p; )
{
mcel_t g = mcel_scanz (p);
p += g.len;
if (!c32isspace (g.ch))
end = p;
}
#else
mbuif_state_t state;
mbuif_init (state);
/* Skip leading whitespace. */
if (how != TRIM_TRAILING)
while (mbuif_avail (state, start))
{
mbchar_t cur = mbuif_next (state, start);
if (!mb_isspace (cur))
break;
start += mb_len (cur);
}
/* Find start of any trailing whitespace. */
if (how != TRIM_LEADING)
for (const char *p = end = start; mbuif_avail (state, p); )
{
mbchar_t cur = mbuif_next (state, p);
p += mb_len (cur);
if (!mb_isspace (cur))
end = p;
}
#endif
}
else
{
/* Skip leading whitespace. */
if (how != TRIM_TRAILING)
while (isspace ((unsigned char) *start))
start++;
/* Find start of any trailing whitespace. */
if (how != TRIM_LEADING)
for (const char *p = end = start; *p; )
if (!isspace ((unsigned char) *p++))
end = p;
}
/* Create trimmed copy. */
size_t dlen = how == TRIM_LEADING ? strlen (start) : end - start;
char *d = malloc (dlen + 1);
if (!d)
xalloc_die ();
char *d_end = mempcpy (d, start, dlen);
*d_end = '\0';
return d;
}
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