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gc: allow colon in //line file name

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Assume last colon introduces line number.

Fixes #2543.

R=ken2
CC=golang-dev
https://golang.org/cl/5485047
This commit is contained in:
Russ Cox 2011-12-12 15:41:54 -05:00
parent ebdcbf1cdc
commit ecda0fa5d4
1 changed files with 14 additions and 10 deletions
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24
src/cmd/gc/lex.c
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@ -1336,7 +1336,7 @@ static int
getlinepragma(void)
{
int i, c, n;
char *cp, *ep;
char *cp, *ep, *linep;
Hist *h;
for(i=0; i<5; i++) {
@ -1347,32 +1347,36 @@ getlinepragma(void)
cp = lexbuf;
ep = lexbuf+sizeof(lexbuf)-5;
linep = nil;
for(;;) {
c = getr();
if(c == '\n' || c == EOF)
if(c == EOF)
goto out;
if(c == '\n')
break;
if(c == ' ')
continue;
if(c == ':')
break;
linep = cp;
if(cp < ep)
*cp++ = c;
}
*cp = 0;
if(linep == nil || linep >= ep)
goto out;
*linep++ = '\0';
n = 0;
for(;;) {
c = getr();
if(!yy_isdigit(c))
break;
n = n*10 + (c-'0');
for(cp=linep; *cp; cp++) {
if(*cp < '0' || *cp > '9')
goto out;
n = n*10 + *cp - '0';
if(n > 1e8) {
yyerror("line number out of range");
errorexit();
}
}
if(c != '\n' || n <= 0)
if(n <= 0)
goto out;
// try to avoid allocating file name over and over