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-rw-r--r--src/string/strlen.c53
-rw-r--r--src/wchar/wcslen.c52
2 files changed, 105 insertions, 0 deletions
diff --git a/src/string/strlen.c b/src/string/strlen.c
new file mode 100644
index 0000000..7023cc0
--- /dev/null
+++ b/src/string/strlen.c
@@ -0,0 +1,53 @@
+/**
+ * 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 <string.h>
+#include <stddef.h>
+
+
+
+/**
+ * Returns the number of bytes in a NUL-terminated
+ * string. This excludes the NUL byte.
+ *
+ * @param str The string.
+ * @return The number of bytes before the first NUL byte.
+ */
+size_t strlen(const char* str)
+{
+ /* TODO optimise strlen */
+ char* s = str;
+ while (*str++);
+ return (size_t)(s - 1 - str);
+}
+
+
+/**
+ * Variant of `strlen` that only inspects the
+ * beginning of s string.
+ *
+ * @param str The string.
+ * @param maxlen The number of bytes to inspect, at most.
+ * @return The number of bytes before, the first NUL byte.
+ * `maxlen` if no NUL byte was found.
+ */
+size_t strnlen(const char* str, size_t maxlen)
+{
+ const char* end = memchr(str, 0, maxlen);
+ return end == NULL ? maxlen : (size_t)(end - str);
+}
+
diff --git a/src/wchar/wcslen.c b/src/wchar/wcslen.c
new file mode 100644
index 0000000..ad81227
--- /dev/null
+++ b/src/wchar/wcslen.c
@@ -0,0 +1,52 @@
+/**
+ * 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>
+
+
+
+/**
+ * `wchar_t` version of `strlen`.
+ *
+ * @param str The string.
+ * @return The number of `wchar_t`:s before the
+ * first NUL character.
+ */
+size_t wcslen(const wchar_t* str)
+{
+ const wchar_t* s = str;
+ while (*s++);
+ return (size_t)(s - 1 - str);
+}
+
+
+/**
+ * `wchar_t` version of `strnlen`.
+ *
+ * @param str The string.
+ * @param maxlen The number of bytes to inspect, at most.
+ * @return The number of `wchar_t`:s before the
+ * first NUL character. `maxlen` if no
+ * NUL character was found.
+ */
+size_t wcsnlen(const wchar_t* str, size_t maxlen)
+{
+ const wchar_t* end = wmemchr(str, 0, maxlen);
+ return end == NULL ? maxlen : (size_t)(end - str);
+}
+