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Fix grammar to eliminate support for unary minus expressions -- they
weren't supported, they aren't standard, and they caused expr to dump core.
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parent
7de54fdffe
commit
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=468
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@ -4,11 +4,13 @@
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*
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* Largely rewritten by J.T. Conklin (jtc@wimsey.com)
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*
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* $Header: /b/source/CVS/src/bin/expr/expr.y,v 1.11 1993/08/17 16:01:23 jtc Exp $
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* $Id : /b/source/CVS/src/bin/expr/expr.y,v 1.11 1993/08/17 16:01:23 jtc Exp $
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale.h>
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#include <ctype.h>
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#include <err.h>
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@ -79,7 +81,6 @@ expr: TOKEN
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| expr '/' expr { $$ = op_div ($1, $3); }
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| expr '%' expr { $$ = op_rem ($1, $3); }
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| expr ':' expr { $$ = op_colon ($1, $3); }
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| '-' expr %prec UNARY { $$ = op_minus (NULL, $2); }
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;
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@ -232,6 +233,8 @@ main (argc, argv)
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int argc;
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char **argv;
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{
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setlocale (LC_ALL, "");
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av = argv + 1;
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yyparse ();
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@ -241,10 +244,7 @@ char **argv;
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else
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printf ("%s\n", result->u.s);
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if (is_zero_or_null (result))
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exit (1);
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else
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exit (0);
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exit (is_zero_or_null (result));
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}
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int
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@ -485,14 +485,13 @@ struct val *a, *b;
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}
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#include <regex.h>
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#define SE_MAX 30
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struct val *
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op_colon (a, b)
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struct val *a, *b;
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{
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regex_t rp;
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regmatch_t rm[SE_MAX];
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regmatch_t rm[2];
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char errbuf[256];
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int eval;
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struct val *v;
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@ -515,7 +514,7 @@ struct val *a, *b;
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free (newpat);
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/* compare string against pattern */
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if (regexec(&rp, a->u.s, SE_MAX, rm, 0) == 0) {
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if (regexec(&rp, a->u.s, 2, rm, 0) == 0) {
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if (rm[1].rm_so >= 0) {
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*(a->u.s + rm[1].rm_eo) = '\0';
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v = make_str (a->u.s + rm[1].rm_so);
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