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 diffcore_pickaxe(const char *needle)
  25{
  26        struct diff_queue_struct *q = &diff_queued_diff;
  27        unsigned long len = strlen(needle);
  28        int i;
  29        struct diff_queue_struct outq;
  30        outq.queue = NULL;
  31        outq.nr = outq.alloc = 0;
  32
  33        for (i = 0; i < q->nr; i++) {
  34                struct diff_filepair *p = q->queue[i];
  35                int onum = outq.nr;
  36                if (!DIFF_FILE_VALID(p->one)) {
  37                        if (!DIFF_FILE_VALID(p->two))
  38                                continue; /* ignore nonsense */
  39                        /* created */
  40                        if (contains(p->two, needle, len))
  41                                diff_q(&outq, p);
  42                }
  43                else if (!DIFF_FILE_VALID(p->two)) {
  44                        if (contains(p->one, needle, len))
  45                                diff_q(&outq, p);
  46                }
  47                else if (!diff_unmodified_pair(p) &&
  48                         contains(p->one, needle, len) !=
  49                         contains(p->two, needle, len))
  50                        diff_q(&outq, p);
  51                if (onum == outq.nr)
  52                        diff_free_filepair(p);
  53        }
  54        free(q->queue);
  55        *q = outq;
  56        return;
  57}