https://github.com/git/git
Jim Mayering noticed that xdiff library took insanely long time when comparing files with many identical lines. This was because the hash function used in the library is broken on 64-bit architectures and caused too many collisions. http://thread.gmane.org/gmane.comp.version-control.git/28962/focus=28994 Acked-by: Davide Libenzi <davidel@xmaliserver.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
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Fix hash function in xdiff library
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "builtin.h"
/*
* Remove empty lines from the beginning and end.
*
* Turn multiple consecutive empty lines into just one
* empty line. Return true if it is an incomplete line.
*/
static int cleanup(char *line)
{
int len = strlen(line);
if (len && line[len-1] == '\n') {
if (len == 1)
return 0;
do {
unsigned char c = line[len-2];
if (!isspace(c))
break;
line[len-2] = '\n';
len--;
line[len] = 0;
} while (len > 1);
return 0;
}
return 1;
}
void stripspace(FILE *in, FILE *out)
{
int empties = -1;
int incomplete = 0;
char line[1024];
while (fgets(line, sizeof(line), in)) {
incomplete = cleanup(line);
/* Not just an empty line? */
if (line[0] != '\n') {
if (empties > 0)
fputc('\n', out);
empties = 0;
fputs(line, out);
continue;
}
if (empties < 0)
continue;
empties++;
}
if (incomplete)
fputc('\n', out);
}
int cmd_stripspace(int argc, const char **argv, const char *prefix)
{
stripspace(stdin, stdout);
return 0;
}
Computing file changes ...