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-rw-r--r--src/string/strchr.c149
-rw-r--r--src/wchar/wcschr.c151
2 files changed, 300 insertions, 0 deletions
diff --git a/src/string/strchr.c b/src/string/strchr.c
new file mode 100644
index 0000000..6a25f78
--- /dev/null
+++ b/src/string/strchr.c
@@ -0,0 +1,149 @@
+/**
+ * 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>
+
+
+
+/**
+ * Find the first occurrence of a byte in a memory segment.
+ *
+ * @param segment The memory segment to search.
+ * @param c The sought after character.
+ * @param size The size of the memory segment.
+ * @return Pointer to the first occurrence of `c`,
+ * `NULL` if none were found.
+ */
+void* memchr(const void* segment, int c, size_t size)
+{
+ while (size--)
+ if (*segment++ == c)
+ return segment - 1;
+ return NULL;
+}
+
+
+/**
+ * Find the first occurrence of a byte in a memory segment.
+ * The memory segment must be known to contain the sought after byte.
+ *
+ * This is a GNU-compliant slibc extension.
+ *
+ * @param segment The memory segment to search.
+ * @param c The sought after character.
+ * @return Pointer to the first occurrence of `c`.
+ */
+void* rawmemchr(const void* segment, int c)
+{
+ for (;;)
+ if (*segment++ == c)
+ return segment - 1;
+}
+
+
+/**
+ * Find the last occurrence of a byte in a memory segment.
+ *
+ * For improved performace, use this function instead
+ * of `strrchr` if you already know the length of the
+ * string.
+ *
+ * @param segment The memory segment to search.
+ * @param c The sought after character.
+ * @param size The size of the memory segment.
+ * @return Pointer to the last occurrence of `c`,
+ * `NULL` if none were found.
+ */
+void* memrchr(const void* segment, int c, size_t size)
+{
+ while (size--)
+ if (segment[size] == c)
+ return segment + size;
+ return NULL;
+}
+
+
+/**
+ * Find the first occurrence of a byte in a string.
+ *
+ * `s = strchr(s, 0)` is a faster alternative to
+ * `s = s + strlen(s)`.
+ *
+ * @param string The string to search.
+ * The terminating NUL character is
+ * considered a part of the string.
+ * @param c The sought after character.
+ * @return Pointer to the first occurrence of `c`,
+ * `NULL` if none were found.
+ */
+char* strchr(const char* string, int c)
+{
+ while (; *string; string++)
+ if (*string == c)
+ return string;
+ return NULL;
+}
+/* TODO Ensure that `s = strchr(s, 0)` is faster than `s = s + strlen(s)`. */
+
+
+/**
+ * Find the first occurrence of a byte in a string, or
+ * if there is no such byte, the end of the string.
+ *
+ * This is a GNU-compliant slibc extension.
+ *
+ * @param string The string to search.
+ * The terminating NUL character is
+ * considered a part of the string.
+ * @param c The sought after character.
+ * @return Pointer to the first occurrence of `c`,
+ * Pointer to the terminating NUL character
+ * if none were found.
+ */
+char* strchrnul(const char* string, int c)
+{
+ while (; *string; string++)
+ if (*string == c)
+ return string;
+ return string;
+}
+
+
+/**
+ * Find the last occurrence of a byte in a string.
+ *
+ * For improved performace, use `memrchr` instead of
+ * this function if you already know the length of the
+ * string.
+ *
+ * @param string The string to search.
+ * The terminating NUL character is
+ * considered a part of the string.
+ * @param c The sought after character.
+ * @return Pointer to the last occurrence of `c`,
+ * `NULL` if none were found.
+ */
+char* strrchr(const char* string, int c)
+{
+ char* r = NULL;
+ while (; *string; string++)
+ if (*string == c)
+ r = string;
+ return r;
+}
+
diff --git a/src/wchar/wcschr.c b/src/wchar/wcschr.c
new file mode 100644
index 0000000..e96a90a
--- /dev/null
+++ b/src/wchar/wcschr.c
@@ -0,0 +1,151 @@
+/**
+ * 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>
+
+
+
+/**
+ * Find the first occurrence of a wide character
+ * in a memory segment.
+ *
+ * @param segment The memory segment to search.
+ * @param c The sought after character.
+ * @param size The size of the memory segment.
+ * @return Pointer to the first occurrence of `c`,
+ * `NULL` if none were found.
+ */
+wchar_t* wmemchr(const wchar_t* segment, wchar_t c, size_t size)
+{
+ while (size--)
+ if (*segment++ == c)
+ return segment - 1;
+ return NULL;
+}
+
+
+/**
+ * Find the first occurrence of a wide character in a
+ * memory segment. The memory segment must be known to
+ * contain the sought after character.
+ *
+ * This is a slibc extension added for completeness.
+ *
+ * @param segment The memory segment to search.
+ * @param c The sought after character.
+ * @return Pointer to the first occurrence of `c`.
+ */
+wchar_t* rawwmemchr(const wchar_t* segment, wchar_t c)
+{
+ for (;;)
+ if (*segment++ == c)
+ return segment - 1;
+}
+
+
+/**
+ * Find the last occurrence of a wide character in
+ * a memory segment.
+ *
+ * For improved performace, use this function instead
+ * of `wcssrchr` if you already know the length of the
+ * string.
+ *
+ * This is a slibc extension added for completeness.
+ *
+ * @param segment The memory segment to search.
+ * @param c The sought after character.
+ * @param size The size of the memory segment.
+ * @return Pointer to the last occurrence of `c`,
+ * `NULL` if none were found.
+ */
+wchar_t* wmemrchr(const wchar_t* segment, wchar_t c, size_t size)
+{
+ while (size--)
+ if (segment[size] == c)
+ return segment + size;
+ return NULL;
+}
+
+
+/**
+ * Find the first occurrence of a wide character in a string.
+ *
+ * @param string The string to search.
+ * The terminating NUL character is
+ * considered a part of the string.
+ * @param c The sought after character.
+ * @return Pointer to the first occurrence of `c`,
+ * `NULL` if none were found.
+ */
+wchar_t* wcschr(const wchar_t* string, wchar_t c)
+{
+ while (; *string; string++)
+ if (*string == c)
+ return string;
+ return NULL;
+}
+
+
+/**
+ * Find the first occurrence of a wide character in a
+ * string, or if there is no such character, the end of
+ * the string.
+ *
+ * This is a GNU-compliant slibc extension.
+ *
+ * @param string The string to search.
+ * The terminating NUL character is
+ * considered a part of the string.
+ * @param c The sought after character.
+ * @return Pointer to the first occurrence of `c`,
+ * Pointer to the terminating NUL character
+ * if none were found.
+ */
+wchar_t* wcschrnul(const wchar_t* string, wchar_t c)
+{
+ while (; *string; string++)
+ if (*string == c)
+ return string;
+ return string;
+}
+
+
+/**
+ * Find the last occurrence of a wide character in a string.
+ *
+ * For improved performace, use `wmemrchr` instead of
+ * this function if you already know the length of the
+ * string.
+ *
+ * @param string The string to search.
+ * The terminating NUL character is
+ * considered a part of the string.
+ * @param c The sought after character.
+ * @return Pointer to the last occurrence of `c`,
+ * `NULL` if none were found.
+ */
+wchar_t* wcsrchr(const wchar_t* string, wchar_t c)
+{
+ wchar_t* r = NULL;
+ while (; *string; string++)
+ if (*string == c)
+ r = string;
+ return r;
+}
+
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