diffdir.c - 9base - revived minimalist port of Plan 9 userland to Unix
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diffdir.c (1900B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include "diff.h"
5
6 static int
7 itemcmp(const void *v1, const void *v2)
8 {
9 char *const*d1 = v1, *const*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 panic(mflag ? 0 : 2, "can't open %s\n", name);
24 return nil;
25 }
26 cp = 0;
27 nitems = 0;
28 if((n = dirreadall(fd, &db)) > 0){
29 while (n--) {
30 cp = REALLOC(cp, char *, (nitems+1));
31 cp[nitems] = MALLOC(char, strlen((db+n)->name)+1);
32 strcpy(cp[nitems], (db+n)->name);
33 nitems++;
34 }
35 free(db);
36 }
37 cp = REALLOC(cp, char*, (nitems+1));
38 cp[nitems] = 0;
39 close(fd);
40 qsort((char *)cp, nitems, sizeof(char*), itemcmp);
41 return cp;
42 }
43
44 static int
45 isdotordotdot(char *p)
46 {
47 if (*p == '.') {
48 if (!p[1])
49 return 1;
50 if (p[1] == '.' && !p[2])
51 return 1;
52 }
53 return 0;
54 }
55
56 void
57 diffdir(char *f, char *t, int level)
58 {
59 char **df, **dt, **dirf, **dirt;
60 char *from, *to;
61 int res;
62 char fb[MAXPATHLEN+1], tb[MAXPATHLEN+1];
63
64 df = scandir(f);
65 dt = scandir(t);
66 dirf = df;
67 dirt = dt;
68 if(df == nil || dt == nil)
69 goto Out;
70 while (*df || *dt) {
71 from = *df;
72 to = *dt;
73 if (from && isdotordotdot(from)) {
74 df++;
75 continue;
76 }
77 if (to && isdotordotdot(to)) {
78 dt++;
79 continue;
80 }
81 if (!from)
82 res = 1;
83 else if (!to)
84 res = -1;
85 else
86 res = strcmp(from, to);
87 if (res < 0) {
88 if (mode == 0 || mode == 'n')
89 Bprint(&stdout, "Only in %s: %s\n", f, from);
90 df++;
91 continue;
92 }
93 if (res > 0) {
94 if (mode == 0 || mode == 'n')
95 Bprint(&stdout, "Only in %s: %s\n", t, to);
96 dt++;
97 continue;
98 }
99 if (mkpathname(fb, f, from))
100 continue;
101 if (mkpathname(tb, t, to))
102 continue;
103 diff(fb, tb, level+1);
104 df++; dt++;
105 }
106 Out:
107 for (df = dirf; df && *df; df++)
108 FREE(*df);
109 for (dt = dirt; dt && *dt; dt++)
110 FREE(*dt);
111 FREE(dirf);
112 FREE(dirt);
113 }