Add file ares_getopt.c

Original file name getopt.c  Initial import into the c-ares source tree
on 2007-04-11.  Lifted from version 5.2 of the 'Open Mash' project with
the modified BSD license, BSD license without the advertising clause.

diff --git a/ares_getopt.c b/ares_getopt.c
new file mode 100644 (file)
index 0000000..3ed40cd
--- /dev/null
+++ b/ares_getopt.c
@@ -0,0 +1,130 @@
+/*
+ * Original file name getopt.c  Initial import into the c-ares source tree
+ * on 2007-04-11.  Lifted from version 5.2 of the 'Open Mash' project with
+ * the modified BSD license, BSD license without the advertising clause.
+ *
+ * $Id$
+ */
+
+/*
+ * getopt.c --
+ *
+ *      Standard UNIX getopt function.  Code is from BSD.
+ *
+ * Copyright (c) 1987-2001 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * A. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * B. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * C. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
+ * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* #if !defined(lint)
+ * static char sccsid[] = "@(#)getopt.c        8.2 (Berkeley) 4/2/94";
+ * #endif
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* declarations to provide consistent linkage */
+extern char *optarg;
+extern int optind;
+extern int opterr;
+
+int    opterr = 1,             /* if error message should be printed */
+       optind = 1,             /* index into parent argv vector */
+       optopt,                 /* character checked for validity */
+       optreset;               /* reset getopt */
+char   *optarg;                /* argument associated with option */
+
+#define        BADCH   (int)'?'
+#define        BADARG  (int)':'
+#define        EMSG    ""
+
+/*
+ * getopt --
+ *     Parse argc/argv argument vector.
+ */
+int
+getopt(nargc, nargv, ostr)
+       int nargc;
+       char * const *nargv;
+       const char *ostr;
+{
+       static char *place = EMSG;              /* option letter processing */
+       char *oli;                              /* option letter list index */
+
+       if (optreset || !*place) {              /* update scanning pointer */
+               optreset = 0;
+               if (optind >= nargc || *(place = nargv[optind]) != '-') {
+                       place = EMSG;
+                       return (EOF);
+               }
+               if (place[1] && *++place == '-') {      /* found "--" */
+                       ++optind;
+                       place = EMSG;
+                       return (EOF);
+               }
+       }                                       /* option letter okay? */
+       if ((optopt = (int)*place++) == (int)':' ||
+           !(oli = strchr(ostr, optopt))) {
+               /*
+                * if the user didn't specify '-' as an option,
+                * assume it means EOF.
+                */
+               if (optopt == (int)'-')
+                       return (EOF);
+               if (!*place)
+                       ++optind;
+               if (opterr && *ostr != ':')
+                       (void)fprintf(stderr,
+                           "%s: illegal option -- %c\n", __FILE__, optopt);
+               return (BADCH);
+       }
+       if (*++oli != ':') {                    /* don't need argument */
+               optarg = NULL;
+               if (!*place)
+                       ++optind;
+       }
+       else {                                  /* need an argument */
+               if (*place)                     /* no white space */
+                       optarg = place;
+               else if (nargc <= ++optind) {   /* no arg */
+                       place = EMSG;
+                       if (*ostr == ':')
+                               return (BADARG);
+                       if (opterr)
+                               (void)fprintf(stderr,
+                                   "%s: option requires an argument -- %c\n",
+                                   __FILE__, optopt);
+                       return (BADCH);
+               }
+               else                            /* white space */
+                       optarg = nargv[optind];
+               place = EMSG;
+               ++optind;
+       }
+       return (optopt);                        /* dump back option letter */
+}