Merge pull request #2 from warmachine2002/master

Implemented more <string.h> functions.

CREDITS

@@ -1 +1,2 @@
 * Vlad Gluhovsky <gluk256@gmail.com>
+* Syed Nasim <warhacker.2002@gmail.com>

README.rst

@@ -220,6 +220,8 @@ Contributors
 
 * `Vlad Gluhovsky <https://github.com/gluckq>`_
 
+* `Syed Nasim <https://github.com/warmachine2002>`_
+
 Donations
 =========
 

src/string/memcpy.c

@@ -9,12 +9,19 @@
 /**
  * @date   2013-05-24
  * @author Arto Bendiken
+ * @auther Syed Nasim
  * @see    http://libc11.org/string/memcpy.html
  */
 void*
 memcpy(void* restrict s1,
        const void* restrict s2,
        size_t n) {
 
-  return (void)s1, (void)s2, (void)n, NULL; // TODO
+  char * dest = (char *) s1;
+  const char * src = (const char *) s2;
+    while ( n-- )
+    {
+        *dest++ = *src++;
+    }
+  return s1;
 }

src/string/memmove.c

@@ -9,12 +9,31 @@
 /**
  * @date   2013-05-24
  * @author Arto Bendiken
+ * @auther Syed Nasim
  * @see    http://libc11.org/string/memmove.html
  */
 void*
 memmove(void* s1,
         const void* s2,
         size_t n) {
 
-  return (void)s1, (void)s2, (void)n, NULL; // TODO
+  char * dest = (char *) s1;
+  const char * src = (const char *) s2;
+  if ( dest <= src )
+  {
+      while ( n-- )
+      {
+          *dest++ = *src++;
+      }
+  }
+  else
+  {
+      src += n;
+      dest += n;
+      while ( n-- )
+      {
+          *--dest = *--src;
+      }
+  }
+  return s1;
 }

src/string/strcat.c

@@ -9,11 +9,18 @@
 /**
  * @date   2014-11-23
  * @author Arto Bendiken
+ * @auther Syed Nasim
  * @see    http://libc11.org/string/strcat.html
  */
 char*
 strcat(char* restrict s1,
        const char* restrict s2) {
 
-  return (void)s1, (void)s2, NULL; // TODO
+  char * rc = s1;
+  if ( *s1 )
+  {
+      while ( *++s1 );
+  }
+  while ( (*s1++ = *s2++) );
+  return rc;
 }

src/string/strcpy.c

@@ -9,11 +9,14 @@
 /**
  * @date   2014-11-23
  * @author Arto Bendiken
+ * @auther Syed Nasim
  * @see    http://libc11.org/string/strcpy.html
  */
 char*
 strcpy(char* restrict s1,
        const char* restrict s2) {
 
-  return (void)s1, (void)s2, NULL; // TODO
+  char * rc = s1;
+  while (( *s1++ = *s2++ ));
+  return rc;
 }

src/string/strncmp.c

@@ -9,12 +9,26 @@
 /**
  * @date   2013-05-24
  * @author Arto Bendiken
+ * @auther Syed Nasim
  * @see    http://libc11.org/string/strncmp.html
  */
 int
 strncmp(const char* const s1,
         const char* const s2,
         const size_t n) {
 
-  return (void)s1, (void)s2, (void)n, -1; // TODO
+  while ( *s1 && n && ( *s1 == *s2 ) )
+  {
+      ++s1;
+      ++s2;
+      --n;
+  }
+  if ( ( n == 0 ) )
+  {
+      return 0;
+  }
+  else
+  {
+      return ( *(uint8_t *)s1 - *(uint8_t *)s2 );
+  }
 }

src/string/strncpy.c

@@ -9,12 +9,22 @@
 /**
  * @date   2014-11-23
  * @author Arto Bendiken
+ * @auther Syed Nasim
  * @see    http://libc11.org/string/strncpy.html
  */
 char*
 strncpy(char* restrict s1,
         const char* restrict s2,
         size_t n) {
 
-  return (void)s1, (void)s2, (void)n, NULL; // TODO
+  char * rc = s1;
+  while ( ( n > 0 ) && ( *s1++ = *s2++ ) )
+  {
+     --n;
+  }
+  while ( n-- > 1 )
+  {
+     *s1++ = '\0';
+  }
+  return rc;
 }