The following piece of code is taken from
SAPI.C/sapi_add_header_ex
it is obvious that this code is nonsense
a) *ptr will point to \0 because someone forgot to increase it (the while loop will never be executed)
b) the second condition in the while loop is redundant
c) the size calculation should be done *after* the while loop

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colon_offset = strchr(header_line, ':');
if (colon_offset) {
   *colon_offset = 0;
   if (!STRCASECMP(header_line, "Content-Type")) {
      char *ptr = colon_offset, *mimetype = NULL, *newheader;
      size_t len = header_line_len - (ptr - header_line), newlen;
      while (*ptr == ' ' && *ptr != '\0') {
         ptr++;
      }
      mimetype = estrdup(ptr);
....
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