Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>

void
main(void)
{
        Fmt fmt;
        char buf[512];
        char *argv0, *args, *flags, *p, *p0;
        int single;
        Rune r;
        
        argv0 = getenv("0");
        if((p = strrchr(argv0, '/')) != nil)
                argv0 = p+1;
        flags = getenv("flagfmt");
        args = getenv("args");
        
        if(argv0 == nil){
                fprint(2, "aux/usage: $0 not set\n");
                exits("$0");
        }
        if(flags == nil)
                flags = "";
        if(args == nil)
                args = "";

        fmtfdinit(&fmt, 2, buf, sizeof buf);
        fmtprint(&fmt, "usage: %s", argv0);
        if(flags[0]){
                single = 0;
                for(p=flags; *p; ){
                        p += chartorune(&r, p);
                        if(*p == ',' || *p == 0){
                                if(!single){
                                        fmtprint(&fmt, " [-");
                                        single = 1;
                                }
                                fmtprint(&fmt, "%C", r);
                                if(*p == ',')
                                        p++;
                                continue;
                        }
                        while(*p == ' ')
                                p++;
                        if(single){
                                fmtprint(&fmt, "]");
                                single = 0;
                        }
                        p0 = p;
                        p = strchr(p0, ',');
                        if(p == nil)
                                p = "";
                        else
                                *p++ = 0;
                        fmtprint(&fmt, " [-%C %s]", r, p0);
                }
                if(single)
                        fmtprint(&fmt, "]");
        }
        if(args)
                fmtprint(&fmt, " %s", args);
        fmtprint(&fmt, "\n");
        fmtfdflush(&fmt);
        exits("usage");
}