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/* prefs.c --- reading and writing the ~/.xscreensaver file.
* xscreensaver, Copyright © 1998-2021 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/time.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "blurb.h"
#include "prefs.h"
static char *
strip (char *s)
{
char *s2;
while (*s == '\t' || *s == ' ' || *s == '\r' || *s == '\n')
s++;
for (s2 = s; *s2; s2++)
;
for (s2--; s2 >= s; s2--)
if (*s2 == '\t' || *s2 == ' ' || *s2 == '\r' || *s2 =='\n')
*s2 = 0;
else
break;
return s;
}
/* Parse the .xscreensaver or XScreenSaver.ad file and run the callback
for each key-value pair.
*/
int
parse_init_file (const char *name,
void (*handler) (int lineno,
const char *key, const char *val,
void *closure),
void *closure)
{
int line = 0;
struct stat st;
FILE *in;
int buf_size = 1024;
char *buf = 0;
if (!name) return 0;
if (stat (name, &st) != 0) goto FAIL;
buf = (char *) malloc (buf_size);
if (!buf) goto FAIL;
in = fopen(name, "r");
if (!in)
{
sprintf (buf, "%s: error reading \"%.100s\"", blurb(), name);
perror (buf);
goto FAIL;
}
if (fstat (fileno (in), &st) != 0)
{
sprintf (buf, "%s: couldn't re-stat \"%.100s\"", blurb(), name);
perror (buf);
free (buf);
return -1;
}
while (fgets (buf, buf_size-1, in))
{
char *key, *value;
int L = strlen (buf);
line++;
while (L > 2 &&
(buf[L-1] != '\n' || /* whole line didn't fit in buffer */
buf[L-2] == '\\')) /* or line ended with backslash */
{
if (buf[L-2] == '\\') /* backslash-newline gets swallowed */
{
buf[L-2] = 0;
L -= 2;
}
buf_size += 1024;
buf = (char *) realloc (buf, buf_size);
if (!buf) goto FAIL;
line++;
if (!fgets (buf + L, buf_size-L-1, in))
break;
L = strlen (buf);
}
/* Now handle other backslash escapes. */
{
int i, j;
for (i = 0; buf[i]; i++)
if (buf[i] == '\\')
{
switch (buf[i+1])
{
case 'n': buf[i] = '\n'; break;
case 'r': buf[i] = '\r'; break;
case 't': buf[i] = '\t'; break;
default: buf[i] = buf[i+1]; break;
}
for (j = i+2; buf[j]; j++)
buf[j-1] = buf[j];
buf[j-1] = 0;
}
}
key = strip (buf);
if (*key == '#' || *key == '!' || *key == ';' ||
*key == '\n' || *key == 0)
continue;
value = strchr (key, ':');
if (!value)
{
fprintf (stderr, "%s: %s:%d: unparsable line: %s\n", blurb(),
name, line, key);
continue;
}
else
{
*value++ = 0;
value = strip (value);
}
handler (line, key, value, closure);
}
fclose (in);
free (buf);
return 0;
FAIL:
if (buf) free (buf);
return -1;
}
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