sys/src/cmd/diff/diffdir.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <bio.h>
   4 #include "diff.h"
   5
   6 static int
   7 itemcmp(void *v1, void *v2)
   8 {
   9         char **d1 = v1, **d2 = v2;
  10
  11         return strcmp(*d1, *d2);
  12 }
  13
  14 static char **
  15 scandir(char *name)
  16 {
  17         char **cp;
  18         Dir *db;
  19         int nitems;
  20         int fd, n;
  21
  22         if ((fd = open(name, OREAD)) < 0) {
  23                 fprint(2, "%s: can't open %s: %r\n", argv0, name);
  24                 /* fake an empty directory */
  25                 cp = MALLOC(char*, 1);
  26                 cp[0] = 0;
  27                 return cp;
  28         }
  29         cp = 0;
  30         nitems = 0;
  31         if((n = dirreadall(fd, &db)) > 0){
  32                 while (n--) {
  33                         cp = REALLOC(cp, char *, (nitems+1));
  34                         cp[nitems] = MALLOC(char, strlen((db+n)->name)+1);
  35                         strcpy(cp[nitems], (db+n)->name);
  36                         nitems++;
  37                 }
  38                 free(db);
  39         }
  40         cp = REALLOC(cp, char*, (nitems+1));
  41         cp[nitems] = 0;
  42         close(fd);
  43         qsort((char *)cp, nitems, sizeof(char*), itemcmp);
  44         return cp;
  45 }
  46
  47 static int
  48 isdotordotdot(char *p)
  49 {
  50         if (*p == '.') {
  51                 if (!p[1])
  52                         return 1;
  53                 if (p[1] == '.' && !p[2])
  54                         return 1;
  55         }
  56         return 0;
  57 }
  58
  59 void
  60 diffdir(char *f, char *t, int level)
  61 {
  62         char  **df, **dt, **dirf, **dirt;
  63         char *from, *to;
  64         int res;
  65         char fb[MAXPATHLEN+1], tb[MAXPATHLEN+1];
  66
  67         df = scandir(f);
  68         dt = scandir(t);
  69         dirf = df;
  70         dirt = dt;
  71         while (*df || *dt) {
  72                 from = *df;
  73                 to = *dt;
  74                 if (from && isdotordotdot(from)) {
  75                         df++;
  76                         continue;
  77                 }
  78                 if (to && isdotordotdot(to)) {
  79                         dt++;
  80                         continue;
  81                 }
  82                 if (!from)
  83                         res = 1;
  84                 else if (!to)
  85                         res = -1;
  86                 else
  87                         res = strcmp(from, to);
  88                 if (res < 0) {
  89                         if (mode == 0 || mode == 'n')
  90                                 Bprint(&stdout, "Only in %s: %s\n", f, from);
  91                         df++;
  92                         continue;
  93                 }
  94                 if (res > 0) {
  95                         if (mode == 0 || mode == 'n')
  96                                 Bprint(&stdout, "Only in %s: %s\n", t, to);
  97                         dt++;
  98                         continue;
  99                 }
 100                 if (mkpathname(fb, f, from))
 101                         continue;
 102                 if (mkpathname(tb, t, to))
 103                         continue;
 104                 diff(fb, tb, level+1);
 105                 df++; dt++;
 106         }
 107         for (df = dirf; *df; df++)
 108                 FREE(*df);
 109         for (dt = dirt; *dt; dt++)
 110                 FREE(*dt);
 111         FREE(dirf);
 112         FREE(dirt);
 113 }