code like
*ptr++ = *ptr++ = *ptr++ = color;
is wrong, because there is no guarantee that ptr will be incremented
_between_ the assignment operations. it can be incremented after all
assignment operations as well. Because of this both of these are valid
implementations for a compiler:
a. assign, increment, assign, increment, assign, increment
b. assign, assign, assign, increment by 3
In case b. only the first memory location of the 3 will be modified, being
assigned 3 times the same value, while the other 2 remain unchanged.
For example egcs-2.91.66 (and possibly gcc-2.95.x too) implement this in
the second way (like in case b.)
Also the order in which the assignement is made is undefined (left to right
or right to left).
this fixed the problem we had with greyscale jpegs showing up in red,
and possibly other problems related to pseudocolor and greyscale displays.
written in the libwraster.la file allowing automatic linking against
all the libs libwraster depends upon without specifing them again when
linking programs that use libwraster. -lwraster will be enough.
old one (the one renamed to wstrconcat). The new wstrappend(dst, src)
will modify and return dst, without creating a new string to hold the
result, except if dst==NULL, in which case its equivalent to calling
wstrdup(src)
be sure to replace wstrappend() with wstrconcat() anywhere in your code
because a new wstrappend() function will be implemented that will have
different semantics and if your code will use the new one instead of
the old will break.
