I'm writing a program in which I use the editline C library to receive user input.
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <editline/readline.h>
#include <editline/history.h>
int main(int argc, char **argv)
{
setlocale(LC_ALL, "sr_RS.utf8");
while (1)
{
char *input = readline("prompt> ");
add_history(input);
printf("%s\n", input);
free(input);
}
return 0;
}
I'm trying to make the program capable of processing text in cyrillic. I have already set the programs locale to Serbian cyrillic, and it seems to process it fine.
However when using the readline function in the "editline/readline.h" header to process the text, a strange runtime bug happens.
prompt> k
k
prompt> к
к
prompt> k
k
Namely, whenever the line entered contains even a single cyrillic character, the readline function adds an extra line-feed character at the end of the string which isn't usually there.
I inserted a crude check into the while loop to test that this is in fact a problem with the readline function.
while (1)
{
char *input = readline("prompt> ");
add_history(input);
for (int i = 0; input[i] != '\0'; ++i)
{
printf("%d\n", (int) input[i]);
}
free(input);
}
as expected it gives the following result:
prompt> k
107
prompt> к
-48
-70
10
My question is, where does this extra line-feed character come from, am I misusing the function, and if so, how do I get rid of this problem, or if that's not the case do I simply check for that extra character every line i get and get rid of it. It seems like there should be a cleaner way to get rid of this problem, but I don't know how.
Just for the sake of clarity I'm using Linux Mint on which I've already set up the sr_RS.utf8 locale.
