Commit e0117410 authored by Arnaud Blanchard's avatar Arnaud Blanchard
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parent 8a20cfbc
BLC program
Copyright : [ETIS]( - ENSEA, University of Cergy-Pontoise, CNRS (2011-2016)
Author : [Arnaud Blanchard](
Licence : [CeCILL v2.1](
Library providing command line program facilities
### Library providing command line program facilities
- Parsing arguments
- Interacting with the user
- Interacting with the user in a terminal
BLC program
Exemple based on **t_parse_arguments**
#include "blc_program.h"
int main( int argc, char **argv){
char const *text_option, *first_parameter, *optional_parameter, *flag;
//The text that appear when help is called.
blc_program_set_description("Program to show how to parse arguments.");
//Define the options to be parsed with 'blc_program_option_interpret'.
blc_program_add_option(&flag, 'f', "flag", NULL, "Show how to read a flag", NULL);
blc_program_add_option(&text_option, 's', "simple", "string", "Simple text as option", "Default text");
//Require one argument.
blc_program_add_parameter(&first_parameter, "string", 1, "Required parameter ", NULL);
//Accept a second optional argument.
blc_program_add_parameter(&optional_parameter, "string", 0, "Show how to accept simple text as option", NULL);
//Interprets the arguments, associates variables and print program name as title.
blc_program_option_interpret_and_print_title(&argc, &argv);
//We display on stderr. It is a good habit to use for interaction with the user
fprintf(stderr, "Display help:\n");
//Display all the possible options / arguments
//After interpret options, we can use the variable **blc_program_name**
fprintf(stderr, "Parsed arguments:\n");
//We present the parsed variables
fprintf(stderr, "- The simple option text is: '%s'\n", text_option);
if (flag) fprintf(stderr, "- The flag is activated, its content (usually useless) is : '%s'\n", flag);
else fprintf(stderr, "- The flag is not activated.\n");
fprintf(stderr, "- The first argument is: '%s'\n", first_parameter);
if (optional_parameter) fprintf(stderr, "- The optional argument is: '%s'\n", optional_parameter);
else fprintf(stderr, "- No optional argument\n");
return 0;
Execute: `../ t_parse_arguments arg1 arg2`
Display help:
usage: t_parse_args [-f] [-s string] string [string]
Program to show how to parse arguments.
positional arguments:
string Required parameter string Show how to accept simple text as option
optional arguments:
-f, --flag Show how to read a flag
-s, --simple string Simple text as option (default: Default text)
Parsed arguments:
- The simple option text is: 'Default text'
- The flag is not activated.
- The first argument is: 'arg1'
- The optional argument is: 'arg2'
### [Online documentation](
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