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
   9 static 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
  24 void 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                         free(p);
  53         }
  54         free(q->queue);
  55         *q = outq;
  56         return;
  57 }