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	netmkaddr.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	---
	netmkaddr.c (1194B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3 #include <ctype.h>
	4
	5 /*
	6 * make an address, add the defaults
	7 */
	8 char *
	9 netmkaddr(char linear, char defnet, char *defsrv)
	10 {
	11 static char addr[256];
	12 char *cp;
	13
	14 /*
	15 * dump network name
	16 */
	17 cp = strchr(linear, '!');
	18 if(cp == 0){
	19 if(defnet == 0)
	20 defnet = "net";
	21 /* allow unix sockets to omit unix! prefix */
	22 if(access(linear, 0) >= 0){
	23 snprint(addr, sizeof(addr), "unix!%s", linear);
	24 return addr;
	25 }
	26 /* allow host:service in deference to Unix convention */
	27 if((cp = strchr(linear, ':')) != nil){
	28 snprint(addr, sizeof(addr), "%s!%.*s!%s",
	29 defnet, utfnlen(linear, cp-linear),
	30 linear, cp+1);
	31 return addr;
	32 }
	33 if(defsrv)
	34 snprint(addr, sizeof(addr), "%s!%s!%s",
	35 defnet, linear, defsrv);
	36 else
	37 snprint(addr, sizeof(addr), "%s!%s", defnet, lin…
	38 return addr;
	39 }
	40
	41 /*
	42 * if there is already a service, use it
	43 */
	44 cp = strchr(cp+1, '!');
	45 if(cp)
	46 return linear;
	47
	48 /*
	49 * if the network is unix, no service
	50 */
	51 if(strncmp(linear, "unix!", 5) == 0)
	52 return linear;
	53
	54 /*
	55 * add default service
	56 */
	57 if(defsrv == 0)
	58 return linear;
	59
	60 snprint(addr, sizeof(addr), "%s!%s", linear, defsrv);
	61 return addr;
	62 }