static void usage(void) { printf("Escape an input string, adopting the av_get_token() escaping logic\n"); printf("usage: ffescape [OPTIONS]\n"); printf("\n" "Options:\n" "-e echo each input line on output\n" "-h print this help\n" "-i INFILE set INFILE as input file, stdin if omitted\n" "-l LEVEL set the number of escaping levels, 1 if omitted\n" "-m ESCAPE_MODE select escape mode between 'full', 'lazy', 'quote', default is 'lazy'\n" "-o OUTFILE set OUTFILE as output file, stdout if omitted\n" "-p PROMPT set output prompt, is '=> ' by default\n" "-s SPECIAL_CHARS set the list of special characters\n"); }