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-rw-r--r--lib/trim.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/lib/trim.c b/lib/trim.c
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+++ b/lib/trim.c
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+/* Removes leading and/or trailing whitespaces
+ Copyright (C) 2006-2020 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;
+}