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/* FILEIO.C
*
* The routines in this file read and write ASCII files from the disk. All of
* the knowledge about files are here.
*
* modified by Petri Kutvonen
*/
#include <stdio.h>
#include "estruct.h"
#include "edef.h"
#include "efunc.h"
static FILE *ffp; /* File pointer, all functions. */
static int eofflag; /* end-of-file flag */
/*
* Open a file for reading.
*/
int ffropen(char *fn)
{
if ((ffp = fopen(fn, "r")) == NULL)
return FIOFNF;
eofflag = FALSE;
return FIOSUC;
}
/*
* Open a file for writing. Return TRUE if all is well, and FALSE on error
* (cannot create).
*/
int ffwopen(char *fn)
{
#if VMS
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.
*/
int ffclose(void)
{
/* free this since we do not need it anymore */
if (fline) {
free(fline);
fline = NULL;
}
eofflag = FALSE;
#if MSDOS & CTRLZ
fputc(26, ffp); /* add a ^Z at the end of the file */
#endif
#if V7 | USG | BSD | (MSDOS & (MSC | TURBO))
if (fclose(ffp) != FALSE) {
mlwrite("Error closing file");
return FIOERR;
}
return FIOSUC;
#else
fclose(ffp);
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.
*/
int ffputline(char *buf, int nbuf)
{
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.
*/
int ffgetline(void)
{
int c; /* current character read */
int i; /* current index into fline */
char *tmpline; /* temp storage for expanding line */
/* if we are at the end...return it */
if (eofflag)
return FIOEOF;
/* dump fline if it ended up too big */
if (flen > NSTRING) {
free(fline);
fline = NULL;
}
/* if we don't have an fline, allocate one */
if (fline == NULL)
if ((fline = malloc(flen = NSTRING)) == NULL)
return FIOMEM;
/* read the line in */
#if PKCODE
if (!nullflag) {
if (fgets(fline, NSTRING, ffp) == (char *) NULL) { /* EOF ? */
i = 0;
c = EOF;
} else {
i = strlen(fline);
c = 0;
if (i > 0) {
c = fline[i - 1];
i--;
}
}
} else {
i = 0;
c = fgetc(ffp);
}
while (c != EOF && c != '\n') {
#else
i = 0;
while ((c = fgetc(ffp)) != EOF && c != '\n') {
#endif
#if PKCODE
if (c) {
#endif
fline[i++] = c;
/* if it's longer, get more room */
if (i >= flen) {
if ((tmpline =
malloc(flen + NSTRING)) == NULL)
return FIOMEM;
strncpy(tmpline, fline, flen);
flen += NSTRING;
free(fline);
fline = tmpline;
}
#if PKCODE
}
c = fgetc(ffp);
#endif
}
/* test for any errors that may have occured */
if (c == EOF) {
if (ferror(ffp)) {
mlwrite("File read error");
return FIOERR;
}
if (i != 0)
eofflag = TRUE;
else
return FIOEOF;
}
fline[i] = 0;
return FIOSUC;
}
/*
* does <fname> exist on disk?
*
* char *fname; file to check for existance
*/
int fexist(char *fname)
{
FILE *fp;
/* try to open the file for reading */
fp = fopen(fname, "r");
/* if it fails, just return false! */
if (fp == NULL)
return FALSE;
/* otherwise, close it and report true */
fclose(fp);
return TRUE;
}
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