1 files changed, 129 insertions, 0 deletions
diff --git a/lib/trim.c b/lib/trim.c
new file mode 100644
index 0000000..def08eb
--- /dev/null
+++ b/lib/trim.c
@@ -0,0 +1,129 @@
+/* Removes leading and/or trailing whitespaces
+   Copyright (C) 2006-2022 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;
+}