fileio.c

/*
 * The routines in this file read and write ASCII files from the disk. All of
 * the knowledge about files are here. A better message writing scheme should
 * be used.
 */
#include        <stdio.h>
#include	"estruct.h"
#include        "edef.h"

FILE    *ffp;                           /* File pointer, all functions. */

/*
 * Open a file for reading.
 */
ffropen(fn)
char    *fn;
{
        if ((ffp=fopen(fn, "r")) == NULL)
                return (FIOFNF);
        return (FIOSUC);
}

/*
 * Open a file for writing. Return TRUE if all is well, and FALSE on error
 * (cannot create).
 */
ffwopen(fn)
char    *fn;
{
#if     VMS
        register int    fd;

        if ((fd=creat(fn, 0666, "rfm=var", "rat=cr")) < 0
        || (ffp=fdopen(fd, "w")) == NULL) {
#else
        if ((ffp=fopen(fn, "w")) == NULL) {
#endif
                mlwrite("Cannot open file for writing");
                return (FIOERR);
        }
        return (FIOSUC);
}

/*
 * Close a file. Should look at the status in all systems.
 */
ffclose()
{
#if	MSDOS
	fputc(26, ffp);		/* add a ^Z at the end of the file */
#endif
	
#if     V7 | (MSDOS & LATTICE)
        if (fclose(ffp) != FALSE) {
                mlwrite("Error closing file");
                return(FIOERR);
        }
        return(FIOSUC);
#else
	if (ffp)
		fclose(ffp);
	ffp = NULL;
        return (FIOSUC);
#endif
}

/*
 * Write a line to the already opened file. The "buf" points to the buffer,
 * and the "nbuf" is its length, less the free newline. Return the status.
 * Check only at the newline.
 */
ffputline(buf, nbuf)
char    buf[];
{
        register int    i;

        for (i = 0; i < nbuf; ++i)
                fputc(buf[i]&0xFF, ffp);

        fputc('\n', ffp);

        if (ferror(ffp)) {
                mlwrite("Write I/O error");
                return (FIOERR);
        }

        return (FIOSUC);
}

/*
 * Read a line from a file, and store the bytes in the supplied buffer. The
 * "nbuf" is the length of the buffer. Complain about long lines and lines
 * at the end of the file that don't have a newline present. Check for I/O
 * errors too. Return status.
 */
ffgetline(buf, nbuf)
register char   buf[];
{
        register int    c;
        register int    i;

        i = 0;

        while ((c = fgetc(ffp)) != EOF && c != '\n') {
                if (i >= nbuf-2) {
			buf[nbuf - 2] = c;	/* store last char read */
			buf[nbuf - 1] = 0;	/* and terminate it */
                        mlwrite("File has long line");
                        return (FIOLNG);
                }
                buf[i++] = c;
        }

        if (c == EOF) {
                if (ferror(ffp)) {
                        mlwrite("File read error");
                        return (FIOERR);
                }

                if (i != 0) {
                        mlwrite("File has funny line at EOF");
                        return (FIOERR);
                }
                return (FIOEOF);
        }

        buf[i] = 0;
        return (FIOSUC);
}