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7365c95d2d
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>
52 lines
930 B
C
52 lines
930 B
C
#include "cache.h"
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#include "mergesort.h"
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struct line {
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char *text;
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struct line *next;
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};
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static void *get_next(const void *a)
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{
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return ((const struct line *)a)->next;
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}
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static void set_next(void *a, void *b)
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{
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((struct line *)a)->next = b;
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}
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static int compare_strings(const void *a, const void *b)
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{
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const struct line *x = a, *y = b;
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return strcmp(x->text, y->text);
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}
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int main(int argc, const char **argv)
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{
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struct line *line, *p = NULL, *lines = NULL;
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struct strbuf sb = STRBUF_INIT;
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for (;;) {
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if (strbuf_getwholeline(&sb, stdin, '\n'))
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break;
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line = xmalloc(sizeof(struct line));
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line->text = strbuf_detach(&sb, NULL);
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if (p) {
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line->next = p->next;
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p->next = line;
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} else {
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line->next = NULL;
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lines = line;
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}
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p = line;
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}
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lines = llist_mergesort(lines, get_next, set_next, compare_strings);
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while (lines) {
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printf("%s", lines->text);
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lines = lines->next;
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}
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return 0;
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}
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