im_histlin, im_updatehist, im_history_get - manage image history
int im_histlin( IMAGE *im, const char *fmt, ... );
int im_updatehist( IMAGE *out, const char *name, int argc, char *argv
const char *im_history_get( IMAGE *im );
im_histlin(3) formats its arguments as printf(3), appends " # time-and-
date", and appends the whole line of text to the image history. The
string is typically the command-line action that would be required to
do whatever it is that you’ve just done to the image.
im_updatehist(3) is given a standard argc/argv, formats them
appropriately, and calls im_histlin(3) for you. Note that the program
name is passed separately.
im_history_get(3) returns the entire history of an image as a single C
string, one action per line. No need to free, but you mustn’t modify
The function returns 0 on success and -1 on error.
Imperial College, London, 2007.
22 April 1991 IM_HISTORY(3)