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/* This is a simple program that runs in an infinite loop. It reads strings
* from standard input in the form of “str1:str2”, sorts them according to the
* locale (set by gawk), and then prints out the first string in sorted order.
*
* The reason we use this instead of just sort(1) or something is because
* spawning one process for each comparison is super slow. This lets us do
* multiple comparisons of string-pairs in only a single process.
*/
#define _GNU_SOURCE
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main(void)
{
char *s1, *s2,
line[256];
/* We need line buffering to make gawk interact with this properly */
setlinebuf(stdout);
setlocale(LC_ALL, "");
while (true) {
if (fgets(line, sizeof(line), stdin) == NULL)
break;
s1 = line;
s2 = strchr(line, ':') + 1;
s2[-1] = '\0';
*strchrnul(s2, '\n') = '\0';
puts(strcoll(s1, s2) < 0 ? s1 : s2);
}
return EXIT_SUCCESS;
}
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