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 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 }