Add ncurses 6.4

third_party/ncurses/strings.c

@@ -0,0 +1,144 @@
+/****************************************************************************
+ * Copyright 2020 Thomas E. Dickey                                          *
+ * Copyright 2000-2012,2017 Free Software Foundation, Inc.                  *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *  Author: Thomas E. Dickey                                                *
+ ****************************************************************************/
+
+/*
+**	lib_mvcur.c
+**/
+
+#include "curses.priv.h"
+#include "tic.h"
+
+MODULE_ID("$Id: strings.c,v 1.10 2020/02/02 23:34:34 tom Exp $")
+
+/****************************************************************************
+ * Useful string functions (especially for mvcur)
+ ****************************************************************************/
+
+#if !HAVE_STRSTR
+NCURSES_EXPORT(char *)
+_nc_strstr(const char *haystack, const char *needle)
+{
+    size_t len1 = strlen(haystack);
+    size_t len2 = strlen(needle);
+    char *result = 0;
+
+    while ((len1 != 0) && (len1-- >= len2)) {
+	if (!strncmp(haystack, needle, len2)) {
+	    result = (char *) haystack;
+	    break;
+	}
+	haystack++;
+    }
+    return result;
+}
+#endif
+
+/*
+ * Initialize the descriptor so we can append to it.  Note that 'src' may
+ * be a null pointer (see _nc_str_null), so the corresponding strcat and
+ * strcpy calls have to allow for this.
+ */
+NCURSES_EXPORT(string_desc *)
+_nc_str_init(string_desc * dst, char *src, size_t len)
+{
+    if (dst != 0) {
+	dst->s_head = src;
+	dst->s_tail = src;
+	dst->s_size = len - 1;
+	dst->s_init = dst->s_size;
+	if (src != 0)
+	    *src = 0;
+    }
+    return dst;
+}
+
+/*
+ * Initialize the descriptor for only tracking the amount of memory used.
+ */
+NCURSES_EXPORT(string_desc *)
+_nc_str_null(string_desc * dst, size_t len)
+{
+    return _nc_str_init(dst, 0, len);
+}
+
+/*
+ * Copy a descriptor
+ */
+NCURSES_EXPORT(string_desc *)
+_nc_str_copy(string_desc * dst, string_desc * src)
+{
+    *dst = *src;
+    return dst;
+}
+
+/*
+ * Replaces strcat into a fixed buffer, returning false on failure.
+ */
+NCURSES_EXPORT(bool)
+_nc_safe_strcat(string_desc * dst, const char *src)
+{
+    if (PRESENT(src)) {
+	size_t len = strlen(src);
+
+	if (len < dst->s_size) {
+	    if (dst->s_tail != 0) {
+		_nc_STRCPY(dst->s_tail, src, dst->s_size);
+		dst->s_tail += len;
+	    }
+	    dst->s_size -= len;
+	    return TRUE;
+	}
+    }
+    return FALSE;
+}
+
+/*
+ * Replaces strcpy into a fixed buffer, returning false on failure.
+ */
+NCURSES_EXPORT(bool)
+_nc_safe_strcpy(string_desc * dst, const char *src)
+{
+    if (PRESENT(src)) {
+	size_t len = strlen(src);
+
+	if (len < dst->s_size) {
+	    if (dst->s_head != 0) {
+		_nc_STRCPY(dst->s_head, src, dst->s_size);
+		dst->s_tail = dst->s_head + len;
+	    }
+	    dst->s_size = dst->s_init - len;
+	    return TRUE;
+	}
+    }
+    return FALSE;
+}