Andrew's git - gitweb.git/blob - diffcore-pickaxe.c

   1/*
   2 * Copyright (C) 2005 Junio C Hamano
   3 */
   4#include "cache.h"
   5#include "diff.h"
   6#include "diffcore.h"
   7#include "delta.h"
   8
   9static int contains(struct diff_filespec *one,
  10                    const char *needle, unsigned long len)
  11{
  12        unsigned long offset, sz;
  13        const char *data;
  14        if (diff_populate_filespec(one))
  15                return 0;
  16        sz = one->size;
  17        data = one->data;
  18        for (offset = 0; offset + len <= sz; offset++)
  19                     if (!strncmp(needle, data + offset, len))
  20                             return 1;
  21        return 0;
  22}
  23
  24void diff_pickaxe(struct diff_queue_struct *q, const char *needle)
  25{
  26        unsigned long len = strlen(needle);
  27        int i;
  28        struct diff_queue_struct outq;
  29        outq.queue = NULL;
  30        outq.nr = outq.alloc = 0;
  31
  32        for (i = 0; i < q->nr; i++) {
  33                struct diff_filepair *p = q->queue[i];
  34                if (!p->one->file_valid) {
  35                        if (!p->two->file_valid)
  36                                continue; /* ignore nonsense */
  37                        /* created */
  38                        if (contains(p->two, needle, len))
  39                                diff_queue(&outq, p->one, p->two);
  40                }
  41                else if (!p->two->file_valid) {
  42                        if (contains(p->one, needle, len))
  43                                diff_queue(&outq, p->one, p->two);
  44                }
  45                else if (contains(p->one, needle, len) !=
  46                         contains(p->two, needle, len))
  47                        diff_queue(&outq, p->one, p->two);
  48        }
  49        for (i = 0; i < q->nr; i++) {
  50                struct diff_filepair *p = q->queue[i];
  51                free(p);
  52        }
  53        free(q->queue);
  54        *q = outq;
  55        return;
  56}