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symset parsing

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Add support for character enclosed within single quotes.  Single
character without quotes would work for most characters, but not
'#' and possibly not '^' or '\\'.  All the values in dat/symbols
are specified via backslash+digits so it isn't obvious that some
other form of value is allowed.

I think this parsing accepts all valid values.  It doesn't reject
all invalid ones:  opening quote followed by valid escape sequence
followed by junk followed by closing quote will ignore the junk.
I don't think there's any pressing need to worry about that.
This commit is contained in:
PatR
2016-04-06 17:06:33 -07:00
parent 3d50dbcbde
commit 3381aa4122
4 changed files with 46 additions and 16 deletions
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40
src/options.c
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@@ -1,4 +1,4 @@
/* NetHack 3.6 options.c $NHDT-Date: 1455357588 2016/02/13 09:59:48 $ $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.264 $ */
/* NetHack 3.6 options.c $NHDT-Date: 1459987581 2016/04/07 00:06:21 $ $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.267 $ */
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* NetHack may be freely redistributed. See license for details. */
@@ -858,8 +858,8 @@ char *tp;
} else if (*cp == '^') { /* expand control-character syntax */
cval = (*++cp & 0x1f);
++cp;
/* remaining cases are all for backslash and we know cp[1] is not
* \0 */
/* remaining cases are all for backslash; we know cp[1] is not \0 */
} else if (index(dec, cp[1])) {
++cp; /* move past backslash to first digit */
do {
@@ -5218,11 +5218,41 @@ char *buf;
int
sym_val(strval)
char *strval;
const char *strval;
{
char buf[QBUFSZ];
buf[0] = '\0';
escapes(strval, buf);
if (!strval[0] || !strval[1]) { /* empty, or single character */
/* if single char is space or tab, leave buf[0]=='\0' */
if (!isspace(strval[0]))
buf[0] = strval[0];
} else if (strval[0] == '\'') { /* single quote */
/* simple matching single quote; we know strval[1] isn't '\0' */
if (strval[2] == '\'' && !strval[3]) {
/* accepts '\' as backslash and ''' as single quote */
buf[0] = strval[1];
/* if backslash, handle single or double quote or second backslash */
} else if (strval[1] == '\\' && strval[2] && strval[3] == '\''
&& index("'\"\\", strval[2]) && !strval[4]) {
buf[0] = strval[2];
/* not simple quote or basic backslash;
strip closing quote and let escapes() deal with it */
} else {
char *p, tmp[QBUFSZ];
(void) strncpy(tmp, strval + 1, sizeof tmp - 1);
tmp[sizeof tmp - 1] = '\0';
if ((p = rindex(tmp, '\'')) != 0) {
*p = '\0';
escapes(tmp, buf);
} /* else buf[0] stays '\0' */
}
} else /* not lone char nor single quote */
escapes(strval, buf);
return (int) *buf;
}