--- a/th_string.c	Mon Jan 27 00:38:46 2020 +0200
+++ b/th_string.c	Mon Jan 27 06:01:57 2020 +0200
@@ -39,6 +39,7 @@
  * characters from the source. A NUL terminator is always added,
  * unless @p src was @c NULL or memory could not be allocated, in which
  * case @c NULL pointer is returned.
+ *
  * @param[in] src string pointer to be copied from
  * @param[in] n maximum number of characters to copy
  * @returns the resulting string or @c NULL pointer
@@ -55,10 +56,10 @@
     if (len > n)
         len = n;
 
-    if ((res = th_malloc(len + 1)) == NULL)
+    if ((res = th_malloc((len + 1) * sizeof(char))) == NULL)
         return NULL;
 
-    memcpy(res, src, len);
+    memcpy(res, src, len * sizeof(char));
     res[len] = 0;
 
     return res;
@@ -100,10 +101,10 @@
         return NULL;
 
     len = end - start + 1;
-    if ((res = th_malloc(len + 1)) == NULL)
+    if ((res = th_malloc((len + 1) * sizeof(char))) == NULL)
         return NULL;
 
-    memcpy(res, src + start, len);
+    memcpy(res, src + start, len * sizeof(char));
     res[len] = 0;
     return res;
 }
@@ -139,6 +140,7 @@
 char *th_strndup_trim(const char *src, const size_t n, const int flags)
 {
     size_t len;
+
     if (src == NULL || n == 0)
         return NULL;
 
@@ -152,10 +154,10 @@
 {
     char *res;
 
-    if ((res = th_malloc(len + 1)) == NULL)
+    if ((res = th_malloc((len + 1) * sizeof(char))) == NULL)
         return NULL;
 
-    memcpy(res, src, len);
+    memcpy(res, src, len * sizeof(char));
     res[len] = 0;
 
     return res;
@@ -317,17 +319,18 @@
     th_vprintf_ctx ctx;
     va_list ap;
 
-    // Get size
+    // Get the size of the output
     va_copy(ap, args);
     ctx.pos = 0;
     th_vprintf_do(&ctx, th_pbuf_alloc_vputch1, fmt, ap);
     va_end(ap);
 
-    // Allocate memory
+    // Allocate memory for it
     ctx.size = ctx.pos + 1;
-    if ((ctx.buf = th_malloc(ctx.size)) == NULL)
+    if ((ctx.buf = th_malloc(ctx.size * sizeof(char))) == NULL)
         return NULL;
 
+    // Print the final result into the buffer
     va_copy(ap, args);
     ctx.pos = 0;
     th_vprintf_do(&ctx, th_pbuf_alloc_vputch2, fmt, ap);
@@ -344,7 +347,7 @@
     if (fmt == NULL)
         return NULL;
 
-    if ((buf = th_malloc(size)) == NULL)
+    if ((buf = th_malloc(size * sizeof(char))) == NULL)
         return NULL;
 
     while (1)
@@ -362,7 +365,7 @@
         else
             size *= 2;
 
-        if ((tmp = th_realloc(buf, size)) == NULL)
+        if ((tmp = th_realloc(buf, size * sizeof(char))) == NULL)
         {
             th_free(buf);
             return NULL;
@@ -535,10 +538,10 @@
     th_free(*pdst);
 
     size_t slen = strlen(src);
-    if ((*pdst = th_malloc(slen + 1)) == NULL)
+    if ((*pdst = th_malloc((slen + 1) * sizeof(char))) == NULL)
         return THERR_MALLOC;
 
-    memcpy(*pdst, src, slen + 1);
+    memcpy(*pdst, src, (slen + 1) * sizeof(char));
 
     return THERR_OK;
 }
@@ -556,18 +559,18 @@
     if (*pdst != NULL)
     {
         size_t dlen = strlen(*pdst), slen = strlen(src);
-        if ((*pdst = th_realloc(*pdst, dlen + slen + 1)) == NULL)
+        if ((*pdst = th_realloc(*pdst, (dlen + slen + 1) * sizeof(char))) == NULL)
             return THERR_MALLOC;
 
-        memcpy((*pdst) + dlen, src, slen + 1);
+        memcpy((*pdst) + dlen, src, (slen + 1) * sizeof(char));
     }
     else
     {
         size_t slen = strlen(src);
-        if ((*pdst = th_malloc(slen + 1)) == NULL)
+        if ((*pdst = th_malloc((slen + 1) * sizeof(char))) == NULL)
             return THERR_MALLOC;
 
-        memcpy(*pdst, src, slen + 1);
+        memcpy(*pdst, src, (slen + 1) * sizeof(char));
     }
 
     return THERR_OK;