ref: ca201805c6603ddcb2617976a40566f4b58703cb
dir: /src/getopt.c/
/* Date: Tue, 25 Dec 84 19:20:50 EST From: Keith Bostic <harvard!seismo!keith> To: genrad!sources Subject: public domain getopt(3) There have recently been several requests for a public domain version of getopt(3), recently. Thought this might be worth reposting. Keith Bostic ARPA: keith@seismo UUCP: seismo!keith ====================================================================== In April of this year, Henry Spencer (utzoo!henry) released a public domain version of getopt (USG, getopt(3)). Well, I've been trying to port some USG dependent software and it didn't seem to work. The problem ended up being that the USG version of getopt has some external variables that aren't mentioned in the documentation. Anyway, to fix these problems, I rewrote the public version of getopt. It has the following advantages: -- it includes those "unknown" variables -- it's smaller/faster 'cause it doesn't use the formatted output conversion routines in section 3 of the UNIX manual. -- the error messages are the same as S5's. -- it has the same side-effects that S5's has. -- the posted bug on how the error messages are flushed has been implemented. (posting by Tony Hansen; pegasus!hansen) I won't post the man pages since Henry already did; a special note, it's not documented in the S5 manual that the options ':' and '?' are illegal. It should be obvious, but I thought I'd mention it... This software was derived from binaries of S5 and the S5 man page, and is (I think?) totally (I'm pretty sure?) compatible with S5 and backward compatible to Henry's version. Keith Bostic ARPA: keith@seismo UUCP: seismo!keith *UNIX is a trademark of Bell Laboratories .. cut along the dotted line ......................................... */ int ansi_c_needs_something_here_too; #ifndef HAVE_GETOPT #include <stdio.h> #include <string.h> #include "st.h" /* * get option letter from argument vector */ int optind = 1, /* index into parent argv vector */ optopt; /* character checked for validity */ char *optarg; /* argument associated with option */ #define BADCH (int)'?' #define EMSG "" #define tell(s) fputs(*nargv,stderr);fputs(s,stderr); \ fputc(optopt,stderr);fputc('\n',stderr);return(BADCH); int getopt(nargc,nargv,ostr) int nargc; char **nargv, *ostr; { static char *place = EMSG; /* option letter processing */ static char *lastostr = (char *) 0; register char *oli; /* option letter list index */ /* LANCE PATCH: dynamic reinitialization */ if (ostr != lastostr) { lastostr = ostr; place = EMSG; } if(!*place) { /* update scanning pointer */ if((optind >= nargc) || (*(place = nargv[optind]) != '-') || ! *++place) { place = EMSG; return(EOF); } if (*place == '-') { /* found "--" */ ++optind; return(EOF); } } /* option letter okay? */ if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr,optopt))) { if(!*place) ++optind; tell(": illegal option -- "); } if (*++oli != ':') { /* don't need argument */ optarg = NULL; if (!*place) ++optind; } else { /* need an argument */ if (*place) optarg = place; /* no white space */ else if (nargc <= ++optind) { /* no arg */ place = EMSG; tell(": option requires an argument -- "); } else optarg = nargv[optind]; /* white space */ place = EMSG; ++optind; } return(optopt); /* dump back option letter */ } #endif