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-@node Functions
-@chapter Functions
-
-@file{<libred.h>} defines a small number of functions.
-@example
-int libred_check_timetravel(void);
-double libred_solar_elevation(double latitude, double longitude);
-int libred_init_colour(void);
-void libred_term_colour(void);
-int libred_get_colour(long int temp, double* r, double* g, double* b);
-@end example
-
-@code{libred_check_timetravel} exits the process if @command{libred}
-is not compiled to support the current time, which is the case if it
-was compiled without @option{-DTIMETRAVELLER} and the clock is before
-year 2000.5 in the Julian calendar. Before exiting, the function will
-print an informative error message to standard error. Upon successful
-completion, without time incompatibility, the function returns 0.
-Upon failure, that is,it is unable to read the clock, the function
-returns @math{-1}. The function may fail for any reason specified for
-@code{clock_gettime}, and set the value of errno to the same values.
-It is recommended to call this function at the beginning of the program.
-
-@example
-#include <libred.h>
-#include <stdio.h>
-int main()
-@{
-  if (libred_check_timetravel())
-    return perror(""), 1;
-  
-  /* @xrm{}Use @xtt{}libred_solar_elevation@xrm{} to your heart's contempt.@xtt{} */
-  
-  return 0;
-@}
-@end example
-
-@code{libred_solar_elevation} calculates the Sun's elevation as apparent
-from a select geographical position. Namely from latitude degrees north
-of GPS's equator and longitude degrees east of GPS's prime meridian.
-The function is only explicitly defined for values between @math{-90} and
-@math{+90} for latitude and values between @math{-180} and @math{+180} for
-and longitude. Other values may or may not work, no error is thrown if used.
-Upon successful completion, the function sets errno to 0 and returns the
-Sun's current apparent elevation, measured in degrees above the horizon.
-On failure, the function returns an arbitrary value (happens to always be
-0.0) and sets @code{errno} an a non-zero value. The function may fail for
-any reason specified for @code{clock_gettime}, and set the value of
-@code{errno} to the same values. @code{errno} is always set to 0 on success.
-
-@example
-#include <libred.h>
-#include <stdio.h>
-#include <stdlib.h>
-int main(int argc, char* argv[])
-@{
-  double elevation, latitude, longitude;
-  
-  if (libred_check_timetravel())
-    return perror(""), 1;
-  
-  if (argc < 3) return 2;
-  latitude  = atof(argv[1]);
-  longitude = atof(argv[2]);
-  
-  elevation = libred_solar_elevation(latitude, longitude);
-  return errno || printf("Elevation: %lf\n", elevation) < 0;
-@}
-@end example
-
-@code{libred_init_colour} open a file descriptor, without returning it,
-to the colour temperature lookup table, and stores the file descriptor to
-@code{libred_fd}. It is necessary to call this function before the first
-call to @code{libred_get_colour}. Upon successful completion, the
-function returns 0. On failure, the function returns @math{-1} and sets
-@code{errno} appropriately. The function may fail for any reason specified
-for @code{open}, and set the value of @code{errno} to the same values.
-@code{errno} is always set to 0 on success. It is possible that the
-behaviour is changed to loading the colour temperature lookup table rather
-than just open a file descriptor to it.
-
-@code{libred_term_colour} deallocates all resources acquired by
-@code{libred_init_colour}. It is highly recommended to call this function
-before calling an @code{exec}-function. If you want to use
-@code{libred_get_colour} again after a call to this function has been
-made, you must first call @code{libred_init_colour}.
-
-@example
-#include <libred.h>
-#include <stdio.h>
-int main(int argc, char* argv[])
-@{
-  if (libred_init_colour())
-    return perror(""), 1;
-  
-  /* @xrm{}Use @xtt{}libred_get_colour@xrm{} to your heart's contempt.@xtt{} */
-  
-  libred_term_colour();
-  return 0;
-@}
-@end example
-
-@code{libred_get_colour} gets or interpolates the colour temperature for
-@code{temp} kelvins, and returns the colour temperature in sRGB. The
-values, between 0.0 and 1.0, for the ``red'', green, and blue channels
-are stored in @code{*r}, @code{*g}, and @code{*b}, respectively.
-Upon successful completion, the function returns 0. On failure, the
-function returns @math{-1} and sets @code{errno} appropriately.
-The function may fail if:
-@table @code
-@item EOVERFLOW
-The colour temperature lookup table is smaller than it should be.
-@item EDOM
-If @code{temp} is less than @code{LIBRED_LOWEST_TEMPERATURE} (which is 1000.)
-@end table
-@noindent
-The function may also fail for any reason specified for @code{pread}, and
-set the value of @code{errno} to the same values.
-
-At least one of the values will be 1.0, none will be greater than 1.0,
-and none will be less than 0.0. It is guaranteed (unless the resources
-file has been modified) that @code{*r}, @code{*g}, and @code{*b} all
-will  be 1.0 if @code{temp} is 6500.
-
-You must call @code{libred_init_colour} before the first use of
-@code{libred_get_colour}, and you should call @code{libred_term_colour}
-after the last use of @code{libred_get_colour}.
-
-@example
-#include <libred.h>
-#include <stdio.h>
-#include <stdlib.h>
-int main(int argc, char* argv[])
-@{
-  long int temp;
-  double r, g, b;
-  
-  if (argc < 2) return 2;
-  temp = atol(argv[1]);
-  
-  if (libred_init_colour())
-    return perror(""), 1;
-  
-  if (libred_get_colour(temp, &r, &g, &b));
-    return perror(""), libred_term_colour(), 1;
-  
-  libred_term_colour();
-  
-  return printf("Red:   %lf\n"
-                "Green: %lf\n"
-                "Blue:  %lf\n",
-                r, g, b) < 0;
-@}
-@end example
-