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	unsharp.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	unsharp.c (927B)
	---
	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 unsharp(char *old)
	18 {
	19 char *new;
	20 int i, olen, nlen, len;
	21
	22 if(replace[0].new == nil)
	23 replace[0].new = get9root();
	24
	25 for(i=0; i<nelem(replace); i++){
	26 if(!replace[i].new)
	27 continue;
	28 olen = strlen(replace[i].old);
	29 if(strncmp(old, replace[i].old, olen) != 0
	30 \|\| (old[olen] != '\0' && old[olen] != '/'))
	31 continue;
	32 nlen = strlen(replace[i].new);
	33 len = strlen(old)+nlen-olen;
	34 new = malloc(len+1);
	35 if(new == nil)
	36 /* Most callers won't check the return value... …
	37 sysfatal("out of memory translating %s to %s%s",…
	38 strcpy(new, replace[i].new);
	39 strcpy(new+nlen, old+olen);
	40 assert(strlen(new) == len);
	41 return new;
	42 }
	43 return old;
	44 }