195b7b453SJohn Marino /* Removes leading and/or trailing whitespaces
2*09d4459fSDaniel Fojt Copyright (C) 2006-2020 Free Software Foundation, Inc.
395b7b453SJohn Marino
495b7b453SJohn Marino This program is free software: you can redistribute it and/or modify
595b7b453SJohn Marino it under the terms of the GNU General Public License as published by
695b7b453SJohn Marino the Free Software Foundation; either version 3 of the License, or
795b7b453SJohn Marino (at your option) any later version.
895b7b453SJohn Marino
995b7b453SJohn Marino This program is distributed in the hope that it will be useful,
1095b7b453SJohn Marino but WITHOUT ANY WARRANTY; without even the implied warranty of
1195b7b453SJohn Marino MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1295b7b453SJohn Marino GNU General Public License for more details.
1395b7b453SJohn Marino
1495b7b453SJohn Marino You should have received a copy of the GNU General Public License
15*09d4459fSDaniel Fojt along with this program. If not, see <https://www.gnu.org/licenses/>. */
1695b7b453SJohn Marino
1795b7b453SJohn Marino /* Written by Davide Angelocola <davide.angelocola@gmail.com> */
1895b7b453SJohn Marino
1995b7b453SJohn Marino #include <config.h>
2095b7b453SJohn Marino
2195b7b453SJohn Marino /* Specification. */
2295b7b453SJohn Marino #include "trim.h"
2395b7b453SJohn Marino
2495b7b453SJohn Marino #include <ctype.h>
2595b7b453SJohn Marino #include <string.h>
2695b7b453SJohn Marino #include <stddef.h>
2795b7b453SJohn Marino #include <stdlib.h>
2895b7b453SJohn Marino
2995b7b453SJohn Marino #include "mbchar.h"
3095b7b453SJohn Marino #include "mbiter.h"
3195b7b453SJohn Marino #include "xalloc.h"
3295b7b453SJohn Marino
33cf28ed85SJohn Marino /* Use this to suppress gcc's "...may be used before initialized" warnings. */
34*09d4459fSDaniel Fojt #if defined GCC_LINT || defined lint
3595b7b453SJohn Marino # define IF_LINT(Code) Code
3695b7b453SJohn Marino #else
3795b7b453SJohn Marino # define IF_LINT(Code) /* empty */
3895b7b453SJohn Marino #endif
3995b7b453SJohn Marino
4095b7b453SJohn Marino char *
trim2(const char * s,int how)4195b7b453SJohn Marino trim2 (const char *s, int how)
4295b7b453SJohn Marino {
4395b7b453SJohn Marino char *d;
4495b7b453SJohn Marino
4595b7b453SJohn Marino d = strdup (s);
4695b7b453SJohn Marino
4795b7b453SJohn Marino if (!d)
4895b7b453SJohn Marino xalloc_die ();
4995b7b453SJohn Marino
5095b7b453SJohn Marino if (MB_CUR_MAX > 1)
5195b7b453SJohn Marino {
5295b7b453SJohn Marino mbi_iterator_t i;
5395b7b453SJohn Marino
5495b7b453SJohn Marino /* Trim leading whitespaces. */
5595b7b453SJohn Marino if (how != TRIM_TRAILING)
5695b7b453SJohn Marino {
5795b7b453SJohn Marino mbi_init (i, d, strlen (d));
5895b7b453SJohn Marino
5995b7b453SJohn Marino for (; mbi_avail (i) && mb_isspace (mbi_cur (i)); mbi_advance (i))
6095b7b453SJohn Marino ;
6195b7b453SJohn Marino
6295b7b453SJohn Marino memmove (d, mbi_cur_ptr (i), strlen (mbi_cur_ptr (i)) + 1);
6395b7b453SJohn Marino }
6495b7b453SJohn Marino
6595b7b453SJohn Marino /* Trim trailing whitespaces. */
6695b7b453SJohn Marino if (how != TRIM_LEADING)
6795b7b453SJohn Marino {
68200fbe8dSJohn Marino unsigned int state = 0;
6995b7b453SJohn Marino char *r IF_LINT (= NULL); /* used only while state = 2 */
7095b7b453SJohn Marino
7195b7b453SJohn Marino mbi_init (i, d, strlen (d));
7295b7b453SJohn Marino
7395b7b453SJohn Marino for (; mbi_avail (i); mbi_advance (i))
7495b7b453SJohn Marino {
7595b7b453SJohn Marino if (state == 0 && mb_isspace (mbi_cur (i)))
7695b7b453SJohn Marino continue;
7795b7b453SJohn Marino
7895b7b453SJohn Marino if (state == 0 && !mb_isspace (mbi_cur (i)))
7995b7b453SJohn Marino {
8095b7b453SJohn Marino state = 1;
8195b7b453SJohn Marino continue;
8295b7b453SJohn Marino }
8395b7b453SJohn Marino
8495b7b453SJohn Marino if (state == 1 && !mb_isspace (mbi_cur (i)))
8595b7b453SJohn Marino continue;
8695b7b453SJohn Marino
8795b7b453SJohn Marino if (state == 1 && mb_isspace (mbi_cur (i)))
8895b7b453SJohn Marino {
8995b7b453SJohn Marino state = 2;
9095b7b453SJohn Marino r = (char *) mbi_cur_ptr (i);
9195b7b453SJohn Marino }
9295b7b453SJohn Marino else if (state == 2 && mb_isspace (mbi_cur (i)))
9395b7b453SJohn Marino {
94200fbe8dSJohn Marino /* empty */
9595b7b453SJohn Marino }
9695b7b453SJohn Marino else
9795b7b453SJohn Marino {
9895b7b453SJohn Marino state = 1;
9995b7b453SJohn Marino }
10095b7b453SJohn Marino }
10195b7b453SJohn Marino
10295b7b453SJohn Marino if (state == 2)
10395b7b453SJohn Marino *r = '\0';
10495b7b453SJohn Marino }
10595b7b453SJohn Marino }
10695b7b453SJohn Marino else
10795b7b453SJohn Marino {
10895b7b453SJohn Marino char *p;
10995b7b453SJohn Marino
11095b7b453SJohn Marino /* Trim leading whitespaces. */
111200fbe8dSJohn Marino if (how != TRIM_TRAILING)
112200fbe8dSJohn Marino {
11395b7b453SJohn Marino for (p = d; *p && isspace ((unsigned char) *p); p++)
11495b7b453SJohn Marino ;
11595b7b453SJohn Marino
11695b7b453SJohn Marino memmove (d, p, strlen (p) + 1);
11795b7b453SJohn Marino }
11895b7b453SJohn Marino
11995b7b453SJohn Marino /* Trim trailing whitespaces. */
120200fbe8dSJohn Marino if (how != TRIM_LEADING)
121200fbe8dSJohn Marino {
122200fbe8dSJohn Marino for (p = d + strlen (d) - 1;
123200fbe8dSJohn Marino p >= d && isspace ((unsigned char) *p); p--)
12495b7b453SJohn Marino *p = '\0';
12595b7b453SJohn Marino }
12695b7b453SJohn Marino }
12795b7b453SJohn Marino
12895b7b453SJohn Marino return d;
12995b7b453SJohn Marino }
130