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fix maketab non-bug

This commit is contained in:
Brian Kernighan 2018-10-25 13:28:54 -04:00
parent 2dc7e5ff1a
commit e8c280034f
3 changed files with 9 additions and 2 deletions
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5
FIXES
View File

@ -25,6 +25,11 @@ THIS SOFTWARE.
This file lists all bug fixes, changes, etc., made since the AWK book
was sent to the printers in August, 1987.
Oct 25, 2018:
Added test in maketab.c to prevent generating a proctab entry
for YYSTYPE_IS_DEFINED. It was harmless but some gcc settings
generated a warning message. Thanks to Nan Xiao for report.
Aug 27, 2018:
Disallow '$' in printf formats; arguments evaluated in order
and printed in order.

4
makefile
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@ -34,8 +34,8 @@ CC = gcc -g -Wall -pedantic
# yacc options. pick one; this varies a lot by system.
#YFLAGS = -d -S
#YACC = bison -d -y
YACC = yacc -d
YACC = bison -d -y
#YACC = yacc -d
# -S uses sprintf in yacc parser instead of sprint
OFILES = b.o main.o parse.o proctab.o tran.o lib.o run.o lex.o

2
maketab.c
View File

@ -135,6 +135,8 @@ int main(int argc, char *argv[])
n = sscanf(buf, "%1c %s %s %d", &c, def, name, &tok);
if (c != '#' || (n != 4 && strcmp(def,"define") != 0)) /* not a valid #define */
continue;
if (strcmp(name, "YYSTYPE_IS_DECLARED") == 0)
continue;
if (tok < FIRSTTOKEN || tok > LASTTOKEN) {
/* fprintf(stderr, "maketab funny token %d %s ignored\n", tok, buf); */
continue;