--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/lib/libc/src/plgetopt.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,248 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** File:          plgetopt.c
+** Description:   utilities to parse argc/argv
+*/
+
+#include "prmem.h"
+#include "prlog.h"
+#include "prerror.h"
+#include "plstr.h"
+#include "plgetopt.h"
+
+#include <string.h>
+
+static char static_Nul = 0;
+
+struct PLOptionInternal
+{
+    const char *options;        /* client options list specification */
+    PRIntn argc;                /* original number of arguments */
+    char **argv;                /* vector of pointers to arguments */
+    PRIntn xargc;               /* which one we're processing now */
+    const char *xargv;          /* where within *argv[xargc] */
+    PRIntn minus;               /* do we already have the '-'? */
+    const PLLongOpt *longOpts;  /* Caller's array */
+    PRBool endOfOpts;           /* have reached a "--" argument */
+    PRIntn optionsLen;          /* is strlen(options) */
+};
+
+/*
+** Create the state in which to parse the tokens.
+**
+** argc        the sum of the number of options and their values
+** argv        the options and their values
+** options    vector of single character options w/ | w/o ':
+*/
+PR_IMPLEMENT(PLOptState*) PL_CreateOptState(
+    PRIntn argc, char **argv, const char *options)
+{
+    return PL_CreateLongOptState( argc, argv, options, NULL);
+}  /* PL_CreateOptState */
+
+PR_IMPLEMENT(PLOptState*) PL_CreateLongOptState(
+    PRIntn argc, char **argv, const char *options, 
+    const PLLongOpt *longOpts)
+{
+    PLOptState *opt = NULL;
+    PLOptionInternal *internal;
+
+    if (NULL == options) 
+    {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return opt;
+    }
+
+    opt = PR_NEWZAP(PLOptState);
+    if (NULL == opt) 
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return opt;
+    }
+
+    internal = PR_NEW(PLOptionInternal);
+    if (NULL == internal)
+    {
+        PR_DELETE(opt);
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return NULL;
+    }
+
+    opt->option = 0;
+    opt->value = NULL;
+    opt->internal = internal;
+    opt->longOption   =  0;
+    opt->longOptIndex = -1;
+
+    internal->argc = argc;
+    internal->argv = argv;
+    internal->xargc = 0;
+    internal->xargv = &static_Nul;
+    internal->minus = 0;
+    internal->options = options;
+    internal->longOpts = longOpts;
+    internal->endOfOpts = PR_FALSE;
+    internal->optionsLen = PL_strlen(options);
+
+    return opt;
+}  /* PL_CreateLongOptState */
+
+/*
+** Destroy object created by CreateOptState()
+*/
+PR_IMPLEMENT(void) PL_DestroyOptState(PLOptState *opt)
+{
+    PR_DELETE(opt->internal);
+    PR_DELETE(opt);
+}  /* PL_DestroyOptState */
+
+PR_IMPLEMENT(PLOptStatus) PL_GetNextOpt(PLOptState *opt)
+{
+    PLOptionInternal *internal = opt->internal;
+
+    opt->longOption   =  0;
+    opt->longOptIndex = -1;
+    /*
+    ** If the current xarg points to nul, advance to the next
+    ** element of the argv vector. If the vector index is equal
+    ** to argc, we're out of arguments, so return an EOL.
+    ** Note whether the first character of the new argument is
+    ** a '-' and skip by it if it is.
+    */
+    while (0 == *internal->xargv)
+    {
+        internal->xargc += 1;
+        if (internal->xargc >= internal->argc)
+        {
+            opt->option = 0;
+            opt->value = NULL;
+            return PL_OPT_EOL;
+        }
+        internal->xargv = internal->argv[internal->xargc];
+        internal->minus = 0;
+        if (!internal->endOfOpts && ('-' == *internal->xargv)) 
+        {
+            internal->minus++;
+            internal->xargv++;  /* and consume */
+            if ('-' == *internal->xargv && internal->longOpts) 
+            {
+                internal->minus++;
+                internal->xargv++;
+                if (0 == *internal->xargv) 
+                {
+                    internal->endOfOpts = PR_TRUE;
+                }
+            }
+        }
+    }
+
+    /*
+    ** If we already have a '-' or '--' in hand, xargv points to the next
+    ** option. See if we can find a match in the list of possible
+    ** options supplied.
+    */
+    if (internal->minus == 2) 
+    {
+        char * foundEqual = strchr(internal->xargv,'=');
+        PRIntn optNameLen = foundEqual ? (foundEqual - internal->xargv) :
+                            strlen(internal->xargv);
+        const PLLongOpt *longOpt = internal->longOpts;
+        PLOptStatus result = PL_OPT_BAD;
+
+        opt->option = 0;
+        opt->value  = NULL;
+
+        for (; longOpt->longOptName; ++longOpt) 
+        {
+            if (strncmp(longOpt->longOptName, internal->xargv, optNameLen))
+                continue;  /* not a possible match */
+            if (strlen(longOpt->longOptName) != optNameLen)
+                continue;  /* not a match */
+            /* option name match */
+            opt->longOptIndex = longOpt - internal->longOpts;
+            opt->longOption   = longOpt->longOption;
+            /* value is part of the current argv[] element if = was found */
+            /* note: this sets value even for long options that do not
+             * require option if specified as --long=value */
+            if (foundEqual) 
+            {
+                opt->value = foundEqual + 1;
+            }
+            else if (longOpt->valueRequired)
+            {
+                /* value is the next argv[] element, if any */
+                if (internal->xargc + 1 < internal->argc)
+                {
+                    opt->value = internal->argv[++(internal->xargc)];
+                }
+                /* missing value */
+                else
+                {
+                    break; /* return PL_OPT_BAD */
+                }
+            }
+            result = PL_OPT_OK;
+            break;
+        }
+        internal->xargv = &static_Nul; /* consume this */
+        return result;
+    }
+    if (internal->minus)
+    {
+        PRIntn cop;
+        PRIntn eoo = internal->optionsLen;
+        for (cop = 0; cop < eoo; ++cop)
+        {
+            if (internal->options[cop] == *internal->xargv)
+            {
+                opt->option = *internal->xargv++;
+                opt->longOption = opt->option & 0xff;
+                /*
+                ** if options indicates that there's an associated
+                ** value, it must be provided, either as part of this
+                ** argv[] element or as the next one
+                */
+                if (':' == internal->options[cop + 1])
+                {
+                    /* value is part of the current argv[] element */
+                    if (0 != *internal->xargv)
+                    {
+                        opt->value = internal->xargv;
+                    }
+                    /* value is the next argv[] element, if any */
+                    else if (internal->xargc + 1 < internal->argc)
+                    {
+                        opt->value = internal->argv[++(internal->xargc)];
+                    }
+                    /* missing value */
+                    else
+                    {
+                        return PL_OPT_BAD;
+                    }
+
+                    internal->xargv = &static_Nul;
+                    internal->minus = 0;
+                }
+                else 
+                    opt->value = NULL; 
+                return PL_OPT_OK;
+            }
+        }
+        internal->xargv += 1;  /* consume that option */
+        return PL_OPT_BAD;
+    }
+
+    /*
+    ** No '-', so it must be a standalone value. The option is nul.
+    */
+    opt->value = internal->argv[internal->xargc];
+    internal->xargv = &static_Nul;
+    opt->option = 0;
+    return PL_OPT_OK;
+}  /* PL_GetNextOpt */
+
+/* plgetopt.c */