--- a/th_string.c	Wed Apr 20 15:46:42 2011 +0300
+++ b/th_string.c	Wed Apr 20 18:47:22 2011 +0300
@@ -439,3 +439,46 @@
 }
 
 
+BOOL th_growbuf(char **buf, size_t *bufsize, size_t *len, size_t grow)
+{
+    assert(buf != NULL);
+    assert(bufsize != NULL);
+    assert(len != NULL);
+    
+    if (*buf == NULL)
+        *bufsize = 0;
+    
+    if (*buf == NULL || *len + grow >= *bufsize) {
+        *bufsize += grow + TH_BUFGROW;
+        *buf = (char *) th_realloc(*buf, *bufsize);
+        if (*buf == NULL)
+            return FALSE;
+    }
+    return TRUE;
+}
+
+
+void th_vputch(char **buf, size_t *bufsize, size_t *len, const char ch)
+{
+    if (!th_growbuf(buf, bufsize, len, 1))
+        return;
+    
+    *buf[*len] = ch;
+    (*len)++;
+}
+
+
+void th_vputs(char **buf, size_t *bufsize, size_t *len, const char *str)
+{
+    size_t slen;
+    if (str == NULL)
+        return;
+    
+    slen = strlen(str);
+    if (!th_growbuf(buf, bufsize, len, slen))
+        return;
+
+    strcat(*buf + *len, str);
+    (*len) += slen;
+}
+

--- a/th_string.h	Wed Apr 20 15:46:42 2011 +0300
+++ b/th_string.h	Wed Apr 20 18:47:22 2011 +0300
@@ -63,6 +63,12 @@
 
 int     th_get_hex_triplet(const char *);
 
+
+void    th_vputch(char **buf, size_t *bufsize, size_t *len, const char ch);
+void    th_vputs(char **buf, size_t *bufsize, size_t *len, const char *str);
+
+#define TH_BUFGROW       (32)
+
 #ifdef __cplusplus
 }
 #endif