Changeset f4b1535 in mainline for kernel/generic/src/lib/string.c

Timestamp:

2009-04-09T23:04:10Z (16 years ago)

Author:

Jiri Svoboda <jirik.svoboda@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

6eb2e96

Parents:

095003a8

Message:

str_ncpy() vs str_cpy(). TODO The same in userspace.

File:

• kernel/generic/src/lib/string.c (modified) (1 diff)

kernel/generic/src/lib/string.c

@@ -529 +529 @@
 }
 
-/** Copy NULL-terminated string.
- *
- * Copy source string @a src to destination buffer @a dst.
- * No more than @a size bytes are written. NULL-terminator is always
- * written after the last succesfully copied character (i.e. if the
- * destination buffer is has at least 1 byte, it will be always
- * NULL-terminated).
- *
- * @param src   Source string.
+/** Copy string.
+ *
+ * Copy source string @a src to destination buffer @a dest.
+ * No more than @a size bytes are written. If the size of the output buffer
+ * is at least one byte, the output string will always be well-formed, i.e.
+ * null-terminated and containing only complete characters.
+ *
  * @param dst   Destination buffer.
  * @param count Size of the destination buffer.
- *
- */
-void str_ncpy(char *dst, const char *src, size_t size)
-{
-        /* No space for the NULL-terminator in the buffer */
+ * @param src   Source string.
+ */
+void str_cpy(char *dest, size_t size, const char *src)
+{
+        wchar_t ch;
+        size_t src_off;
+        size_t dest_off;
+
+        /* No space for the NULL-terminator in the buffer. */
         if (size == 0)
                 return;
         
+        src_off = 0;
+        dest_off = 0;
+
+        while ((ch = str_decode(src, &src_off, STR_NO_LIMIT)) != 0) {
+                if (chr_encode(ch, dest, &dest_off, size - 1) != EOK)
+                        break;
+        }
+
+        dest[dest_off] = '\0';
+}
+
+/** Copy size-limited substring.
+ *
+ * Copy source string @a src to destination buffer @a dest.
+ * No more than @a size bytes are written. If the size of the output buffer
+ * is at least one byte, the output string will always be well-formed, i.e.
+ * null-terminated and containing only complete characters.
+ *
+ * No more than @a n bytes are read from the input string, so it does not
+ * have to be null-terminated.
+ *
+ * @param dst   Destination buffer.
+ * @param count Size of the destination buffer.
+ * @param src   Source string.
+ */
+void str_ncpy(char *dest, size_t size, const char *src, size_t n)
+{
         wchar_t ch;
-        size_t str_off = 0;
-        size_t dst_off = 0;
-        
-        while ((ch = str_decode(src, &str_off, STR_NO_LIMIT)) != 0) {
-                if (chr_encode(ch, dst, &dst_off, size) != EOK)
+        size_t src_off;
+        size_t dest_off;
+
+        /* No space for the null terminator in the buffer. */
+        if (size == 0)
+                return;
+        
+        src_off = 0;
+        dest_off = 0;
+
+        while ((ch = str_decode(src, &src_off, n)) != 0) {
+                if (chr_encode(ch, dest, &dest_off, size - 1) != EOK)
                         break;
         }
-        
-        if (dst_off >= size)
-                dst[size - 1] = 0;
-        else
-                dst[dst_off] = 0;
+
+        dest[dest_off] = '\0';
 }