ref: 260d1eaaa73a377fb7b0cfc00707ddba35a54ccd
dir: /sys/src/cmd/aux/getflags.c/
#include <u.h> #include <libc.h> #include <ctype.h> void usage(void) { print("status=usage\n"); exits(0); } char* findarg(char *flags, Rune r) { char *p; Rune rr; for(p=flags; p!=(char*)1; p=strchr(p, ',')+1){ 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; while(*p == ' ') p++; for(; *p && *p != ','; p++) if(*p == ' ' && *(p-1) != ' ') n++; return n; } void main(int argc, char *argv[]) { char *flags, *p, *s, *e, buf[512]; int i, n; 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=flags; p!=(char*)1 && *p != 0; p=strchr(p, ',')+1){ s = e = nil; if(p[1] == ':'){ s = p + 2; e = argname(s); } if(s != e) fmtprint(&fmt, "%.*s=()\n", (int)(e - s), s); else fmtprint(&fmt, "flag%.1s=()\n", p); } 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); }