Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/shell/lexan.c

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/* Embedded XINU, Copyright (C) 2007.  All rights reserved. */

#include <kernel.h>
#include <shell.h>

short lexan(char *line, ushort linelen, char *tokbuf, char *tok[])
{
        char   quote;                  /* character for quoted string  */
        ushort ntok = 0;               /* number of tokens parsed      */
        ushort i = 0;                  /* temp variable                */

        while ((i < linelen) && (ntok < SHELL_MAXTOK))
        {
                /* Skip whitespace in line of input */
                while (isWhitespace(line[i]) && (i < linelen))
                { i++; }

                /* Stop parsing at end of line */
                if (isEndOfLine(line[i]) || (i >= linelen))
                { return ntok; }

                /* Set token to point to value in token buffer */
                tok[ntok] = tokbuf;

                /* Handle quoted string */
                if (isQuote(line[i]))
                {
                        quote = *tokbuf++ = line[i++];

                        while ( (quote != line[i])
                             && (!isEndOfLine(line[i])) && (i < linelen))
                        { *tokbuf++ = line[i++]; }

                        if (quote == line[i])
                        { *tokbuf++ = line[i++]; }
                        else
                        { return SYSERR; }
                }
                else
                {
                        *tokbuf++ = line[i++];

                        /* Handle standard alphanumeric token */
                        if (!isOtherSpecial(line[i-1]))
                        {
                                while ( (!isEndOfLine(line[i])) && (!isQuote(line[i]))
                                     && (!isOtherSpecial(line[i])) && (!isWhitespace(line[i]))
                                     && (i < linelen) )
                                { *tokbuf++ = line[i++]; }

                                if (i >= linelen)
                                        return SYSERR;
                        }
                }

                /* Finish current token */
                *tokbuf++ = '\0';
                ntok++; 
        }

        return ntok;
}

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