Changeset 375ab5e in mainline for uspace/lib/c/generic/str.c

Timestamp:

2011-08-24T20:10:43Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

eb660787

Parents:

7fadb65 (diff), 842a2d2 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge from lp:~romanenko-oleg/helenos/fat.

File:

• uspace/lib/c/generic/str.c (modified) (9 diffs)

uspace/lib/c/generic/str.c

@@ -3 +3 @@
  * Copyright (c) 2008 Jiri Svoboda
  * Copyright (c) 2011 Martin Sucha
+ * Copyright (c) 2011 Oleg Romanenko
  * All rights reserved.
  *
@@ -367 +368 @@
 }
 
+/** Check whether wide string is plain ASCII.
+ *
+ * @return True if wide string is plain ASCII.
+ *
+ */
+bool wstr_is_ascii(const wchar_t *wstr)
+{
+        while (*wstr && ascii_check(*wstr))
+                wstr++;
+        return *wstr == 0;
+}
+
 /** Check whether character is valid
  *
@@ -619 +632 @@
  * @param size  Size of the destination buffer.
  * @param src   Source wide string.
- */
-void wstr_to_str(char *dest, size_t size, const wchar_t *src)
-{
+ *
+ * @return EOK, if success, negative otherwise.
+ */
+int wstr_to_str(char *dest, size_t size, const wchar_t *src)
+{
+        int rc;
         wchar_t ch;
         size_t src_idx;
@@ -633 +649 @@
 
         while ((ch = src[src_idx++]) != 0) {
-                if (chr_encode(ch, dest, &dest_off, size - 1) != EOK)
+                rc = chr_encode(ch, dest, &dest_off, size - 1);
+                if (rc != EOK)
                         break;
         }
 
         dest[dest_off] = '\0';
-}
+        return rc;
+}
+
+/** Convert UTF16 string to string.
+ *
+ * Convert utf16 string @a src to string. The output is written to the buffer
+ * specified by @a dest and @a size. @a size must be non-zero and the string
+ * written will always be well-formed. Surrogate pairs also supported.
+ *
+ * @param dest  Destination buffer.
+ * @param size  Size of the destination buffer.
+ * @param src   Source utf16 string.
+ *
+ * @return EOK, if success, negative otherwise.
+ */
+int utf16_to_str(char *dest, size_t size, const uint16_t *src)
+{
+        size_t idx=0, dest_off=0;
+        wchar_t ch;
+        int rc = EOK;
+
+        /* There must be space for a null terminator in the buffer. */
+        assert(size > 0);
+
+        while (src[idx]) {
+                if ((src[idx] & 0xfc00) == 0xd800) {
+                        if (src[idx+1] && (src[idx+1] & 0xfc00) == 0xdc00) {
+                                ch = 0x10000;
+                                ch += (src[idx] & 0x03FF) << 10;
+                                ch += (src[idx+1] & 0x03FF);
+                                idx += 2;
+                        }
+                        else
+                                break;
+                } else {
+                        ch = src[idx];
+                        idx++;
+                }
+                rc = chr_encode(ch, dest, &dest_off, size-1);
+                if (rc != EOK)
+                        break;
+        }
+        dest[dest_off] = '\0';
+        return rc;
+}
+
+int str_to_utf16(uint16_t *dest, size_t size, const char *src)
+{
+        int rc=EOK;
+        size_t offset=0;
+        size_t idx=0;
+        wchar_t c;
+
+        assert(size > 0);
+        
+        while ((c = str_decode(src, &offset, STR_NO_LIMIT)) != 0) {
+                if (c > 0x10000) {
+                        if (idx+2 >= size-1) {
+                                rc=EOVERFLOW;
+                                break;
+                        }
+                        c = (c - 0x10000);
+                        dest[idx] = 0xD800 | (c >> 10);
+                        dest[idx+1] = 0xDC00 | (c & 0x3FF);
+                        idx++;
+                } else {
+                         dest[idx] = c;
+                }
+
+                idx++;
+                if (idx >= size-1) {
+                        rc=EOVERFLOW;
+                        break;
+                }
+        }
+
+        dest[idx] = '\0';
+        return rc;
+}
+
 
 /** Convert wide string to new string.
@@ -698 +794 @@
  * @param dlen  Length of destination buffer (number of wchars).
  * @param src   Source string.
- */
-void str_to_wstr(wchar_t *dest, size_t dlen, const char *src)
-{
+ *
+ * @return EOK, if success, negative otherwise.
+ */
+int str_to_wstr(wchar_t *dest, size_t dlen, const char *src)
+{
+        int rc=EOK;
         size_t offset;
         size_t di;
@@ -711 +810 @@
 
         do {
-                if (di >= dlen - 1)
+                if (di >= dlen - 1) {
+                        rc = EOVERFLOW;
                         break;
+                }
 
                 c = str_decode(src, &offset, STR_NO_LIMIT);
@@ -719 +820 @@
 
         dest[dlen - 1] = '\0';
+        return rc;
 }
 
@@ -783 +885 @@
         
         return (char *) res;
+}
+
+/** Find first occurence of character in wide string.
+ *
+ * @param wstr String to search.
+ * @param ch  Character to look for.
+ *
+ * @return Pointer to character in @a wstr or NULL if not found.
+ */
+wchar_t *wstr_chr(const wchar_t *wstr, wchar_t ch)
+{
+        while (*wstr && *wstr != ch)
+                wstr++;
+        if (*wstr)
+                return (wchar_t *) wstr;
+        else
+                return NULL;
+}
+
+/** Find last occurence of character in wide string.
+ *
+ * @param wstr String to search.
+ * @param ch  Character to look for.
+ *
+ * @return Pointer to character in @a wstr or NULL if not found.
+ */
+wchar_t *wstr_rchr(const wchar_t *wstr, wchar_t ch)
+{
+        const wchar_t *res = NULL;
+        while (*wstr) {
+                if (*wstr == ch)
+                        res = wstr;
+                wstr++;
+        }
+        return (wchar_t *) res;
 }
 
@@ -1037 +1174 @@
 }
 
+void str_reverse(char* begin, char* end) 
+{
+    char aux;
+    while(end>begin)
+        aux=*end, *end--=*begin, *begin++=aux;
+}
+
+int size_t_str(size_t value, int base, char* str, size_t size) 
+{
+    static char num[] = "0123456789abcdefghijklmnopqrstuvwxyz";
+    char* wstr=str;
+        
+        if (size == 0) 
+                return EINVAL;
+    if (base<2 || base>35) {
+        *str='\0';
+        return EINVAL;
+    }
+
+    do {
+        *wstr++ = num[value % base];
+                if (--size == 0)
+                        return EOVERFLOW;
+    } while(value /= base);
+    *wstr='\0';
+
+    // Reverse string
+    str_reverse(str,wstr-1);
+        return EOK;
+}
 
 /** Convert initial part of string to unsigned long according to given base.