* [9fans] UTF and the preprocessor
@ 2009-03-30 15:30 hugo rivera
2009-03-30 15:45 ` andrey mirtchovski
2009-03-30 18:55 ` erik quanstrom
0 siblings, 2 replies; 3+ messages in thread
From: hugo rivera @ 2009-03-30 15:30 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
Hi there,
I just found out that the preprocessor on plan 9 doesn't like utf. I
hope I am wrong, but just try to compile something like
# include <u.h>
# include <libc.h>
# define ΓVAL 12
void main(void);
void
main()
{
int β;
β = ΓVAL;
while(β < 15)
print("%d\n", β++);
exits(nil);
}
and you get a "syntax in #define" error that points to the define
line. Remove (or replace) the utf character and everything works as
expected.
--
Hugo
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [9fans] UTF and the preprocessor
2009-03-30 15:30 [9fans] UTF and the preprocessor hugo rivera
@ 2009-03-30 15:45 ` andrey mirtchovski
2009-03-30 18:55 ` erik quanstrom
1 sibling, 0 replies; 3+ messages in thread
From: andrey mirtchovski @ 2009-03-30 15:45 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
until somebody gives you a proper explanation of this you can use the
ansi C preprocessor (-p) to compile this particular code. e.g:
% 8c -p t.c; 8l t.8
% 8.out
12
13
14
% cat t.c
#include <u.h>
#include <libc.h>
#define ΓVAL 12
...
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [9fans] UTF and the preprocessor
2009-03-30 15:30 [9fans] UTF and the preprocessor hugo rivera
2009-03-30 15:45 ` andrey mirtchovski
@ 2009-03-30 18:55 ` erik quanstrom
1 sibling, 0 replies; 3+ messages in thread
From: erik quanstrom @ 2009-03-30 18:55 UTC (permalink / raw)
To: 9fans
others more qualified may disagree, but in this
case i think an enum would be preferred. however,
there are some cases where an enum will not do.
for example,
#define prγ(γ, fmt, ...) if(γ >1.) print(fmt, __VA_ARGS__)
i think that this patch will do the trick. i continued the
assumption that the the ctype macros are valid for any c,
even if !isascii(c). this diff is hard to read, the source is
also at http://www.quanstro.net/plan9/macbody
/n/dump/2009/0330/sys/src/cmd/cc/lex.c:1029,1035 - lex.c:1029,1035
} else
c = GETC();
for(;;) {
- if(!isspace(c))
+ if(c >= Runeself || !isspace(c))
return c;
if(c == '\n') {
lineno++;
; diffy -c macbody
/n/dump/2009/0330/sys/src/cmd/cc/macbody:18,39 - macbody:18,44
return n;
}
- Sym*
- getsym(void)
+ static void
+ nextsym(int c)
{
- int c;
+ int c1;
char *cp;
- c = getnsc();
- if(!isalpha(c) && c != '_') {
- unget(c);
- return S;
- }
for(cp = symb;;) {
- if(cp <= symb+NSYMB-4)
- *cp++ = c;
+ if(c >= Runeself) {
+ for(c1=0;;) {
+ if(cp <= symb+NSYMB-4)
+ cp[c1++] = c;
+ if(fullrune(cp, c1))
+ break;
+ c = getc();
+ }
+ cp += c1;
+ }else
+ if(cp <= symb+NSYMB-4)
+ *cp++ = c;
c = getc();
- if(isalnum(c) || c == '_')
+ if(c >= Runeself || isalnum(c) || c == '_')
continue;
unget(c);
break;
/n/dump/2009/0330/sys/src/cmd/cc/macbody:41,46 - macbody:46,64
*cp = 0;
if(cp > symb+NSYMB-4)
yyerror("symbol too large: %s", symb);
+ }
+
+ Sym*
+ getsym(void)
+ {
+ int c;
+
+ c = getnsc();
+ if(c < Runeself && !isalpha(c) && c != '_') {
+ unget(c);
+ return S;
+ }
+ nextsym(c);
return lookup();
}
/n/dump/2009/0330/sys/src/cmd/cc/macbody:193,199 - macbody:211,217
macdef(void)
{
Sym *s, *a;
- char *args[NARG], *np, *base;
+ char *args[NARG], *base;
int n, i, c, len, dots;
int ischr;
/n/dump/2009/0330/sys/src/cmd/cc/macbody:235,249 - macbody:253,261
len = 1;
ischr = 0;
for(;;) {
- if(isalpha(c) || c == '_') {
- np = symb;
- *np++ = c;
+ if(c >= Runeself || isalpha(c) || c == '_') {
+ nextsym(c);
c = getc();
- while(isalnum(c) || c == '_') {
- *np++ = c;
- c = getc();
- }
- *np = 0;
for(i=0; i<n; i++)
if(strcmp(symb, args[i]) == 0)
break;
/n/dump/2009/0330/sys/src/cmd/cc/macbody:660,666 - macbody:672,678
for(;;) {
c = getc();
if(c != '#') {
- if(!isspace(c))
+ if(c >= Runeself || !isspace(c))
bol = 0;
if(c == '\n')
bol = 1;
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-03-30 15:45 ` andrey mirtchovski
2009-03-30 18:55 ` erik quanstrom
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