ftnirps - string formatter
ftnirps (s, format [, arg ] ... )
Ftnirps formats a string from the argument list and copies the string to s with a terminating null character (\0). This function is compatible with sprintf(C-3) except that not all of the conversion specifications are implemented. Ftnirps is called internally by C/Base instead of sprintf for code size considerations. It lacks many of the fancy features of sprintf and does not handle floating point at all. This makes ftnirps much smaller and likewise programs that call ftnirps. It is recommended that, if possible, sprintf(C-3) be called in place of ftnirps.
Formatting and conversion is controlled by the format argument. The format is a character string that contains either characters to copy into the formatted string or conversion specifications. Conversion specifications take additional arguments from the list, convert them and copy the result in the formatted string.
The implemented conversions are:
%s takes the next argument as a pointer to a null terminated string and copies the
%d takes the next argument as an integer, converts the integer to ascii, and copies the result into the formatted string
%ld takes the next argument is a long integer, converts the integer to ascii, and copies the result into the formatted string
%c takes the next argument as a single character and stores the character in the formatted string
%% a percent sign (%) or any other character not listed above immediately following a % is copied to the formatted string
Conversions %s, %d and %ld also understand field widths. A field width is specified as a string of numeric digits immediately following the % (before the conversion character). If the field width begins with a -, the converted result is left justified instead of the default right justification. For conversions %d and %ld, if the field width digits begin with 0, zero fill is done instead of the default blank fill.
Since ftnirps does not implement floating point conversions, to print floating point values you must convert the values with realtoa(C-3), moneytoa(C-3) or sprintf(C-3).
Sometimes things make more sense when spelled backwards.