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#include <u.h>
#include <libc.h>
#include <ctype.h>
void
usage(void)
{
print("status=usage\n");
exits(0);
}
char*
skipspace(char *p)
{
while(isspace(*p))
p++;
return p;
}
char*
nextarg(char *p)
{
char *s;
s = strchr(p, ',');
if(s == nil)
return p+strlen(p); /* to \0 */
while(*s == ',' || isspace(*s))
s++;
return s;
}
char*
findarg(char *flags, Rune r)
{
char *p;
Rune rr;
for(p=skipspace(flags); *p; p=nextarg(p)){
chartorune(&rr, p);
if(rr == r)
return p;
}
return nil;
}
char*
argname(char *p)
{
Rune r;
int n;
while(1){
n = chartorune(&r, p);
if(!isalpharune(r) && !isdigitrune(r))
break;
p += n;
}
return p;
}
int
countargs(char *p)
{
int n;
n = 1;
for(p=skipspace(p); *p && *p != ','; p++)
if(isspace(*p) && !isspace(*(p-1)))
n++;
return n;
}
void
main(int argc, char *argv[])
{
char *flags, *p, *s, *e, buf[512];
int i, n;
Rune r;
Fmt fmt;
doquote = needsrcquote;
quotefmtinstall();
argv0 = argv[0]; /* for sysfatal */
flags = getenv("flagfmt");
if(flags == nil){
fprint(2, "$flagfmt not set\n");
print("exit 'missing flagfmt'");
exits(0);
}
fmtfdinit(&fmt, 1, buf, sizeof buf);
for(p=skipspace(flags); *p; p=nextarg(p)){
s = e = nil;
n = chartorune(&r, p);
if(p[n] == ':'){
s = p + n + 1;
e = argname(s);
}
if(s != e)
fmtprint(&fmt, "%.*s=()\n", (int)(e - s), s);
else
fmtprint(&fmt, "flag%C=()\n", r);
}
ARGBEGIN{
default:
if((p = findarg(flags, ARGC())) == nil)
usage();
p += runelen(ARGC());
s = p + 1;
e = p + 1;
if(*p == ':' && (e = argname(s)) != s)
p = e;
if(*p == ',' || *p == 0){
if(s != e)
fmtprint(&fmt, "%.*s=1\n", (int)(e - s), s);
else
fmtprint(&fmt, "flag%C=1\n", ARGC());
break;
}
n = countargs(p);
if(s != e)
fmtprint(&fmt, "%.*s=(", (int)(e - s), s);
else
fmtprint(&fmt, "flag%C=(", ARGC());
for(i=0; i<n; i++)
fmtprint(&fmt, "%s%q", i ? " " : "", EARGF(usage()));
fmtprint(&fmt, ")\n");
}ARGEND
fmtprint(&fmt, "*=(");
for(i=0; i<argc; i++)
fmtprint(&fmt, "%s%q", i ? " " : "", argv[i]);
fmtprint(&fmt, ")\n");
fmtprint(&fmt, "status=''\n");
fmtfdflush(&fmt);
exits(0);
}
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