source: buchla-68k/prolog/croot.c@ e15f784

/*
   ============================================================================
        croot.c -- Root for Buchla 700 C programs
        Version 8 -- 1987-06-29 -- D.N. Lynx Crowe

        This version can be setup for I/O redirection or not, depending on the
        value of REDIRECT.  If redirection is supported, so are command line
        arguments, which must be passed to Croot() at 'cp' by the startup code.

        Normally, this won't be selected, as this is a dedicated application
        that doesn't expect command line arguments or I/O redirection.
   ============================================================================
*/

#define ROOTMSG "{Buchla 700 Croot - Version 8 - 1987-06-29}"

#include "ram.h"

#define REDIRECT        0       /* non-zero for command line stuff */

#define MAXARGS         30      /* maximum number of command line arguments */

void (*_clsall)(void);

static  int16_t Argc;
static  int8_t  *Argv[MAXARGS];

/*
   ============================================================================
        exit() -- return control to the BIOS
   ============================================================================
*/

void exit(void)
{
        (*_clsall)();           /* close all open files */
        xtrap15();              /* return to the BIOS */
}


#if     REDIRECT

/*
   ============================================================================
        _eredir(name) -- output I/O redirection error message to stderr
   ============================================================================
*/

static
_eredir(name)
char *name;
{
        char buff[200];

        strcpy(buff, "Can't open file for redirection: ");
        strcat(buff, name);
        strcat(buff, "\n");
        write(2, buff, strlen(buff));
        exit();
}

#endif

/*
   ============================================================================
        Croot(cp) -- C root module for the Buchla 700
   ============================================================================
*/

void Croot(int8_t *cp)
{
        register        int8_t  *fname;
        register        int16_t k;

        Argv[0] = ROOTMSG;
        Argc = 1;

        _clsall = _fd_cls;
        InitFS();

#if     REDIRECT

        while (Argc < MAXARGS) {        /* handle command line arguments */

                while (*cp EQ ' ' OR *cp EQ '\t')       /* skip whitespace */
                        ++cp;

                if (*cp EQ 0)                   /* check for end of line */
                        break;

                if (*cp EQ '>') {               /* > - redirect output */

                        k = 1;  /* stdout */
                        goto redir;

                } else if (*cp EQ '<') {        /* < - redirect input */

                        k = 0;  /* stdin */
redir:
                        while (*++cp EQ ' ' OR *cp EQ '\t')     /* skip whitespace */
                                ;

                        fname = cp;     /* pointer to start of name */

                        while (*++cp)   /* skip to whitespace */
                                if (*cp EQ ' ' OR *cp EQ '\t') {

                                        *cp++ = 0;
                                        break;
                                }

                        close(k);       /* close old assignment */

                        if (k)
                                k = creat(fname, 0666);         /* stdout */
                        else
                                k = open(fname, O_RDONLY);      /* stdin */

                        if (k EQ -1)
                                _eredir(fname);

                } else {        /* collect a command line argument */

                        Argv[Argc++] = cp;

                        while (*++cp)   /* find end of argument */
                                if (*cp EQ ' ' OR *cp EQ '\t') {

                                        *cp++ = 0;
                                        break;
                                }
                }
        }

#else
        (void)cp;
        (void)k;
        (void)fname;
#endif

        main();                 /* call application */
        exit();                 /* exit in case the application didn't */
}