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/*
* nvidia-xconfig: A tool for manipulating XF86Config files,
* specifically for use by the NVIDIA Linux graphics driver.
*
* Copyright (C) 2004 NVIDIA Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses>.
*
*
* util.c
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/termios.h>
#include "nvidia-xconfig.h"
Options *__op = NULL;
/*
* copy_file() - copy the file specified by srcfile to dstfile, using
* mmap and memcpy. The destination file is created with the
* permissions specified by mode. Roughly based on code presented by
* Richard Stevens, in Advanced Programming in the Unix Environment,
* 12.9.
*/
int copy_file(const char *srcfile, const char *dstfile, mode_t mode)
{
int src_fd = -1, dst_fd = -1;
struct stat stat_buf;
char *src, *dst;
int ret = FALSE;
if ((src_fd = open(srcfile, O_RDONLY)) == -1) {
fmterr("Unable to open '%s' for copying (%s)",
srcfile, strerror (errno));
goto done;
}
if ((dst_fd = open(dstfile, O_RDWR | O_CREAT | O_TRUNC, mode)) == -1) {
fmterr("Unable to create '%s' for copying (%s)",
dstfile, strerror (errno));
goto done;
}
if (fstat(src_fd, &stat_buf) == -1) {
fmterr("Unable to determine size of '%s' (%s)",
srcfile, strerror (errno));
goto done;
}
if (stat_buf.st_size == 0) {
/* src file is empty; silently ignore */
ret = TRUE;
goto done;
}
if (lseek(dst_fd, stat_buf.st_size - 1, SEEK_SET) == -1) {
fmterr("Unable to set file size for '%s' (%s)",
dstfile, strerror (errno));
goto done;
}
if (write(dst_fd, "", 1) != 1) {
fmterr("Unable to write file size for '%s' (%s)",
dstfile, strerror (errno));
goto done;
}
if ((src = mmap(0, stat_buf.st_size, PROT_READ,
MAP_SHARED, src_fd, 0)) == (void *) -1) {
fmterr("Unable to map source file '%s' for "
"copying (%s)", srcfile, strerror (errno));
goto done;
}
if ((dst = mmap(0, stat_buf.st_size, PROT_READ | PROT_WRITE,
MAP_SHARED, dst_fd, 0)) == (void *) -1) {
fmterr("Unable to map destination file '%s' for "
"copying (%s)", dstfile, strerror (errno));
goto done;
}
memcpy(dst, src, stat_buf.st_size);
if (munmap (src, stat_buf.st_size) == -1) {
fmterr("Unable to unmap source file '%s' after "
"copying (%s)", srcfile, strerror (errno));
goto done;
}
if (munmap (dst, stat_buf.st_size) == -1) {
fmterr("Unable to unmap destination file '%s' after "
"copying (%s)", dstfile, strerror (errno));
goto done;
}
ret = TRUE;
done:
if (src_fd != -1) close(src_fd);
if (dst_fd != -1) close(dst_fd);
return ret;
} /* copy_file() */
/*
* directory_exists() -
*/
int directory_exists(const char *dir)
{
struct stat stat_buf;
if ((stat (dir, &stat_buf) == -1) || (!S_ISDIR(stat_buf.st_mode))) {
return FALSE;
} else {
return TRUE;
}
} /* directory_exists() */
/*
* xconfigPrint() - this is the one entry point that a user of the
* XF86Config-Parser library must provide.
*/
void xconfigPrint(MsgType t, const char *msg)
{
typedef struct {
MsgType msg_type;
char *prefix;
FILE *stream;
int newline;
} MessageTypeAttributes;
char *prefix = NULL;
int i, newline = FALSE;
FILE *stream = stdout;
const MessageTypeAttributes msg_types[] = {
{ ParseErrorMsg, "PARSE ERROR: ", stderr, TRUE },
{ ParseWarningMsg, "PARSE WARNING: ", stderr, TRUE },
{ ValidationErrorMsg, "VALIDATION ERROR: ", stderr, TRUE },
{ InternalErrorMsg, "INTERNAL ERROR: ", stderr, TRUE },
{ WriteErrorMsg, "ERROR: ", stderr, TRUE },
{ WarnMsg, "WARNING: ", stderr, TRUE },
{ ErrorMsg, "ERROR: ", stderr, TRUE },
{ DebugMsg, "DEBUG: ", stdout, FALSE },
{ UnknownMsg, NULL, stdout, FALSE },
};
for (i = 0; msg_types[i].msg_type != UnknownMsg; i++) {
if (msg_types[i].msg_type == t) {
prefix = msg_types[i].prefix;
newline = msg_types[i].newline;
stream = msg_types[i].stream;
break;
}
}
if (newline) fmt(stream, NULL, "");
fmt(stream, prefix, msg);
if (newline) fmt(stream, NULL, "");
} /* xconfigPrint */
/*
* fget_next_line() - read from the given FILE stream until a newline,
* EOF, or null terminator is encountered, writing data into a
* growable buffer. The eof parameter is set to TRUE when EOF is
* encountered. In all cases, the returned string is null-terminated.
*
* XXX this function will be rather slow because it uses fgetc() to
* pull each character off the stream one at a time; this is done so
* that each character can be examined as it's read so that we can
* appropriately deal with EOFs and newlines. A better implementation
* would use fgets(), but that would still require us to parse each
* read line, checking for newlines or guessing if we hit an EOF.
*/
#define NV_LINE_LEN 32
char *fget_next_line(FILE *fp, int *eof)
{
char *buf = NULL, *tmpbuf;
char *c = NULL;
int len = 0, buflen = 0;
if (eof) *eof = FALSE;
while (1) {
if (buflen == len) { /* buffer isn't big enough -- grow it */
buflen += NV_LINE_LEN;
tmpbuf = (char *) nvalloc (buflen);
if (buf) {
memcpy (tmpbuf, buf, len);
free (buf);
}
buf = tmpbuf;
c = buf + len;
}
*c = fgetc(fp);
if ((*c == EOF) && (eof)) *eof = TRUE;
if ((*c == EOF) || (*c == '\n') || (*c == '\0')) {
*c = '\0';
return buf;
}
len++;
c++;
} /* while (1) */
return NULL; /* should never get here */
} /* fget_next_line() */
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