split strstr.c and strchr.c

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

1 files changed, 42 insertions, 0 deletions

diff --git a/src/string/memchr.c b/src/string/memchr.c
new file mode 100644
index 0000000..380fa0f
--- /dev/null
+++ b/src/string/memchr.c
@@ -0,0 +1,42 @@
+/**
+ * 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>
+
+
+# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
+
+
+
+/**
+ * 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)
+{
+  char* s = segment;
+  while (size--)
+    if (*s++ == c)
+      return s - 1;
+  return NULL;
+}
+