add strstr functions

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 189 insertions, 0 deletions

diff --git a/src/wchar/wcsstr.c b/src/wchar/wcsstr.c
new file mode 100644
index 0000000..bba7d96
--- /dev/null
+++ b/src/wchar/wcsstr.c
@@ -0,0 +1,189 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#include <wchar.h>
+#include <stddef.h>
+#include <inttypes.h>
+
+#define WIDE
+
+
+
+/**
+ * This function is identical to `wcsstr`.
+ */
+wchar_t* wcswcs(const wchar_t* haystack, const wchar_t* needle)
+{
+  return wcsstr(haystack, needle);
+}
+
+
+/**
+ * Finds the first occurrence of a substring.
+ * This search is case sensitive.
+ * 
+ * @param   haystack  The string to search.
+ * @param   needle    The sought after substring.
+ * @return            Pointer to the first occurrence of the
+ *                    substring, `NULL` if not found.
+ */
+wchar_t* wcsstr(const wchar_t* haystack, const wchar_t* needle)
+{
+  return wmemmem(haystack, wcslen(haystack), needle, wcslen(needle));
+}
+
+
+/**
+ * Finds the first occurrence of a substring.
+ * This search is case insensitive.
+ * 
+ * This is a slibc extension.
+ * 
+ * @param   haystack  The string to search.
+ * @param   needle    The sought after substring.
+ * @return            Pointer to the first occurrence of the
+ *                    substring, `NULL` if not found.
+ */
+wchar_t* wcscasestr(const wchar_t* haystack, const wchar_t* needle)
+{
+  return wmemcasemem(haystack, wcslen(haystack), needle, wcslen(needle));
+}
+
+
+/**
+ * Finds the first occurrence of a substring.
+ * This search is case sensitive.
+ * 
+ * This is a slibc extension added for because it was useful
+ * in implementing slibc itself.
+ * 
+ * @param   haystack  The string to search.
+ * @param   needle    The sought after substring.
+ * @param   maxlen    The maximum number of character to search.
+ * @return            Pointer to the first occurrence of the
+ *                    substring, `NULL` if not found.
+ */
+wchar_t* wcsnstr(const wchar_t* haystack, const wchar_t* needle, size_t maxlen)
+{
+  return wmemmem(haystack, wcsnlen(haystack, maxlen), needle, wcslen(needle));
+}
+
+
+/**
+ * Finds the first occurrence of a substring.
+ * This search is case insensitive.
+ * 
+ * This is a slibc extension added for completeness.
+ * 
+ * @param   haystack  The string to search.
+ * @param   needle    The sought after substring.
+ * @param   maxlen    The maximum number of character to search.
+ * @return            Pointer to the first occurrence of the
+ *                    substring, `NULL` if not found.
+ */
+wchar_t* wcsncasestr(const wchar_t* haystack, const wchar_t* needle, size_t maxlen)
+{
+  return wmemcasemem(haystack, wcsnlen(haystack, maxlen), needle, wcslen(needle));
+}
+
+
+/**
+ * Finds the first occurrence of a substring.
+ * This search is case sensitive.
+ * It must already be known that such a substring exists.
+ * 
+ * This is a slibc extension.
+ * 
+ * @param   haystack  The string to search.
+ * @param   needle    The sought after substring.
+ * @return            Pointer to the first occurrence of the substring.
+ */
+wchar_t* rawwcsstr(const wchar_t* haystack, const wchar_t* needle)
+{
+  return wmemmem(haystack, SIZE_MAX, needle, wcslen(needle));
+}
+
+
+/**
+ * Finds the first occurrence of a substring.
+ * This search is case insensitive.
+ * It must already be known that such a substring exists.
+ * 
+ * This is a slibc extension.
+ * 
+ * @param   haystack  The string to search.
+ * @param   needle    The sought after substring.
+ * @return            Pointer to the first occurrence of the substring.
+ */
+wchar_t* rawwcscasestr(const wchar_t* haystack, const wchar_t* needle)
+{
+  return wmemcasemem(haystack, SIZE_MAX, needle, wcslen(needle));
+}
+
+
+/**
+ * Finds the first occurrence of a substring
+ * This search is case sensitive.
+ * 
+ * This is a slibc extension added for completeness,
+ * and because it was it was useful in implementing
+ * slibc itself.
+ * 
+ * @param   haystack         The string to search.
+ * @param   haystack_length  The number of character to search.
+ * @param   needle           The sought after substring.
+ * @param   needle_length    The length of `needle`.
+ * @return                   Pointer to the first occurrence of
+ *                           the substring, `NULL` if not found.
+ */
+wchar_t* wmemmem(const wchar_t* haystack, size_t haystack_length,
+		 const wchar_t* needle, size_t needle_length)
+{
+  if (haystack_length < needle_length)
+    return NULL;
+  if (haystack_length == needle_length)
+    return !wmemcmp(haystack, haystack_length, haystack_length) ? haystack : NULL;
+#include "../string/substring.h"
+}
+
+
+/**
+ * Finds the first occurrence of a substring
+ * This search is case insensitive.
+ * 
+ * This is a slibc extension added because it was useful
+ * in implementing slibc itself.
+ * 
+ * @param   haystack         The string to search.
+ * @param   haystack_length  The number of character to search.
+ * @param   needle           The sought after substring.
+ * @param   needle_length    The length of `needle`.
+ * @return                   Pointer to the first occurrence of
+ *                           the substring, `NULL` if not found.
+ */
+wchar_t* wmemcasemem(const wchar_t* haystack, size_t haystack_length,
+		     const wchar_t* needle, size_t needle_length)
+{
+  if (haystack_length < needle_length)
+    return NULL;
+  if (haystack_length == needle_length)
+    return !wmemcasecmp(haystack, haystack_length, haystack_length) ? haystack : NULL;
+#define CASE
+#include "../string/substring.h"
+#undef CASE
+}
+