standards/116826: [PATCH] sh support for POSIX character classes
Roy Marples
uberlord at gentoo.org
Tue Oct 2 06:40:03 PDT 2007
>Number: 116826
>Category: standards
>Synopsis: [PATCH] sh support for POSIX character classes
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-standards
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 02 13:40:03 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator: Roy Marples
>Release: FreeBSD-6.2
>Organization:
Gentoo
>Environment:
FreeBSD uberlaptop 6.2-RELEASE FreeBSD Gentoo 6.2-r3 #0: Thu Sep 13 17:44:37 BST 2007 root at uberlaptop:/usr/src/sys-6.2-r3/i386/compile/UBERKERNEL i386
>Description:
sh does not support POSIX character classes
http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html#tag_09_03_05
>How-To-Repeat:
$ sh -c 'case foo in [[:alpha:]]*) echo "alpha";; *) echo "not alpha";; esac'
not alpha
I would expect it to echo alpha.
>Fix:
Patch attached with submission follows:
diff -u a/sh/expand.c b/sh/expand.c
--- a/sh/expand.c 2005-11-06 20:39:47 +0000
+++ b/sh/expand.c 2007-10-02 13:46:28 +0100
@@ -1320,6 +1320,42 @@
}
+STATIC int ccmatch(char *p, int chr, char **r)
+{
+ static const struct class {
+ char name[10];
+ int (*fn)(int);
+ } classes[] = {
+ { .name = ":alnum:]", .fn = isalnum },
+ { .name = ":cntrl:]", .fn = iscntrl },
+ { .name = ":lower:]", .fn = islower },
+ { .name = ":space:]", .fn = isspace },
+ { .name = ":alpha:]", .fn = isalpha },
+ { .name = ":digit:]", .fn = isdigit },
+ { .name = ":print:]", .fn = isprint },
+ { .name = ":upper:]", .fn = isupper },
+ { .name = ":blank:]", .fn = isblank },
+ { .name = ":graph:]", .fn = isgraph },
+ { .name = ":punct:]", .fn = ispunct },
+ { .name = ":xdigit:]", .fn = isxdigit },
+ };
+ const struct class *class, *end;
+ char *q;
+
+ end = classes + sizeof(classes) / sizeof(classes[0]);
+ for (class = classes; class < end; class++) {
+ q = prefix(class->name, p);
+ if (!q)
+ continue;
+ *r = q;
+ return class->fn(chr);
+ }
+
+ *r = 0;
+ return 0;
+}
+
+
STATIC int
pmatch(char *pattern, char *string, int squoted)
{
@@ -1405,6 +1441,15 @@
continue;
if (c == CTLESC)
c = *p++;
+ else if (c == '[') {
+ char *r;
+
+ found |= ccmatch(p, chr, &r);
+ if (r) {
+ p = r;
+ continue;
+ }
+ }
if (*p == '-' && p[1] != ']') {
p++;
while (*p == CTLQUOTEMARK)
diff -u a/sh/mystring.c b/sh/mystring.c
--- a/sh/mystring.c 2004-04-06 21:06:51 +0100
+++ b/sh/mystring.c 2007-10-02 13:45:31 +0100
@@ -88,14 +88,14 @@
* prefix -- see if pfx is a prefix of string.
*/
-int
+char *
prefix(const char *pfx, const char *string)
{
while (*pfx) {
if (*pfx++ != *string++)
return 0;
}
- return 1;
+ return (char *)string;
}
diff -u a/sh/mystring.h b/sh/mystring.h
--- a/sh/mystring.h 2004-04-06 21:06:51 +0100
+++ b/sh/mystring.h 2007-10-02 13:45:35 +0100
@@ -36,7 +36,7 @@
#include <string.h>
void scopyn(const char *, char *, int);
-int prefix(const char *, const char *);
+char *prefix(const char *, const char *);
int number(const char *);
int is_number(const char *);
>Release-Note:
>Audit-Trail:
>Unformatted:
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