git/test-mergesort.c
Junio C Hamano 7365c95d2d mergesort: rename it to llist_mergesort()
Even though the function is generic enough, <anything>sort() inherits
connotations from the standard function qsort() that sorts an array.
Rename it to llist_mergesort() and describe the external interface in
its header file.

This incidentally avoids name clashes with mergesort() some platforms
declare in, and contaminate user namespace with, their <stdlib.h>.

Reported-by: Brian Gernhardt
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-04-17 11:07:01 -07:00

53 lines
930 B
C

#include "cache.h"
#include "mergesort.h"
struct line {
char *text;
struct line *next;
};
static void *get_next(const void *a)
{
return ((const struct line *)a)->next;
}
static void set_next(void *a, void *b)
{
((struct line *)a)->next = b;
}
static int compare_strings(const void *a, const void *b)
{
const struct line *x = a, *y = b;
return strcmp(x->text, y->text);
}
int main(int argc, const char **argv)
{
struct line *line, *p = NULL, *lines = NULL;
struct strbuf sb = STRBUF_INIT;
for (;;) {
if (strbuf_getwholeline(&sb, stdin, '\n'))
break;
line = xmalloc(sizeof(struct line));
line->text = strbuf_detach(&sb, NULL);
if (p) {
line->next = p->next;
p->next = line;
} else {
line->next = NULL;
lines = line;
}
p = line;
}
lines = llist_mergesort(lines, get_next, set_next, compare_strings);
while (lines) {
printf("%s", lines->text);
lines = lines->next;
}
return 0;
}