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/*
* support/nfs/xio.c
*
* Simple I/O functions for the parsing of /etc/exports and /etc/nfsclients.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include "xmalloc.h"
#include "xlog.h"
#include "xio.h"
XFILE *
xfopen(char *fname, char *type)
{
XFILE *xfp;
FILE *fp;
if (!(fp = fopen(fname, type)))
return NULL;
xfp = (XFILE *) xmalloc(sizeof(*xfp));
xfp->x_fp = fp;
xfp->x_line = 1;
return xfp;
}
void
xfclose(XFILE *xfp)
{
fclose(xfp->x_fp);
xfree(xfp);
}
int
xflock(char *fname, char *type)
{
int readonly = !strcmp(type, "r");
struct flock fl = { readonly? F_RDLCK : F_WRLCK, SEEK_SET, 0, 0, 0 };
int fd;
if (readonly)
fd = open(fname, (O_RDONLY|O_CREAT), 0600);
else
fd = open(fname, (O_RDWR|O_CREAT), 0600);
if (fd < 0) {
xlog(L_WARNING, "could not open %s for locking: errno %d (%s)",
fname, errno, strerror(errno));
return -1;
}
if (fcntl(fd, F_SETLKW, &fl) < 0) {
xlog(L_WARNING, "failed to lock %s: errno %d (%s)",
fname, errno, strerror(errno));
close(fd);
fd = -1;
}
return fd;
}
void
xfunlock(int fd)
{
close(fd);
}
#define isoctal(x) (isdigit(x) && ((x)<'8'))
int
xgettok(XFILE *xfp, char sepa, char *tok, int len)
{
int i = 0;
int c = 0;
int quoted=0;
while (i < len && (c = xgetc(xfp)) != EOF &&
(quoted || (c != sepa && !isspace(c)))) {
if (c == '"') {
quoted = !quoted;
continue;
}
tok[i++] = c;
if (i >= 4 &&
tok[i-4] == '\\' &&
isoctal(tok[i-3]) &&
isoctal(tok[i-2]) &&
isoctal(tok[i-1]) &&
((tok[i]=0),
(c = strtol(tok+i-3,NULL, 8)) < 256)) {
i -= 4;
tok[i++] = c;
}
}
if (c == '\n')
xungetc(c, xfp);
if (!i)
return 0;
if (i >= len || (sepa && c != sepa))
return -1;
tok[i] = '\0';
return 1;
}
int
xgetc(XFILE *xfp)
{
int c = getc(xfp->x_fp);
if (c == EOF)
return c;
if (c == '\\') {
if ((c = getc(xfp->x_fp)) != '\n') {
ungetc(c, xfp->x_fp);
return '\\';
}
xfp->x_line++;
while ((c = getc(xfp->x_fp)) == ' ' || c == '\t');
ungetc(c, xfp->x_fp);
return ' ';
}
if (c == '\n')
xfp->x_line++;
return c;
}
void
xungetc(int c, XFILE *xfp)
{
if (c == EOF)
return;
ungetc(c, xfp->x_fp);
if (c == '\n')
xfp->x_line--;
}
void
xskip(XFILE *xfp, char *str)
{
int c;
while ((c = xgetc(xfp)) != EOF) {
if (c == '#')
c = xskipcomment(xfp);
if (strchr(str, c) == NULL)
break;
}
xungetc(c, xfp);
}
char
xskipcomment(XFILE *xfp)
{
int c;
while ((c = getc(xfp->x_fp)) != EOF && c != '\n');
return c;
}
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