1 #include <u.h>
2 #include <libc.h>
3 
4 /*
5  * I don't want too many of these,
6  * but the ones we have are just too useful. 
7  */
8 static struct {
9 	char *old;
10 	char *new;
11 } replace[] = {
12 	"#9", nil,	/* must be first */
13 	"#d", "/dev/fd",
14 };
15 
16 char*
17 plan9translate(char *old)
18 {
19 	char *new;
20 	int i, olen, nlen, len;
21 
22 	if(replace[0].new == nil){
23 		replace[0].new = getenv("PLAN9");
24 		if(replace[0].new == nil)
25 			replace[0].new = "/usr/local/plan9";
26 	}
27 
28 	for(i=0; i<nelem(replace); i++){
29 		if(!replace[i].new)
30 			continue;
31 		olen = strlen(replace[i].old);
32 		if(strncmp(old, replace[i].old, olen) != 0
33 		|| (old[olen] != '\0' && old[olen] != '/'))
34 			continue;
35 		nlen = strlen(replace[i].new);
36 		len = strlen(old)+nlen-olen;
37 		new = malloc(len+1);
38 		if(new == nil)
39 			return "<out of memory>";
40 		strcpy(new, replace[i].new);
41 		strcpy(new+nlen, old+olen);
42 		assert(strlen(new) == len);
43 		return new;
44 	}
45 	return old;
46 }