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/* $NetBSD: dewey_cmp.c,v 1.1.1.1 2001/04/02 18:04:04 wennmach Exp $ */
/*
* Implement the comparision of a package name with a dewey pattern
* for use with PostgreSQL.
*
* Author: Lex Wennmacher,
* almost entirely based on the dewey routines written by: Hubert Feyrer
* (taken from: basesrc/usr.sbin/pkg_install/lib/str.c, version 1.28
*/
#include <sys/cdefs.h>
#if 0
static const char *rcsid = "Id: str.c,v 1.5 1997/10/08 07:48:21 charnier Exp";
#else
__RCSID("$NetBSD: dewey_cmp.c,v 1.1.1.1 2001/04/02 18:04:04 wennmach Exp $");
#endif
/*
* FreeBSD install - a package for the installation and maintainance
* of non-core utilities.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Jordan K. Hubbard
* 18 July 1993
*
* Miscellaneous string utilities.
*
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/queue.h>
#include <ctype.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <err.h>
#include <fnmatch.h>
int pmatch(const char *, const char *);
typedef enum deweyop_t {
GT,
GE,
LT,
LE
} deweyop_t;
/*
* Compare two dewey decimal numbers
*/
static int
deweycmp(char *a, deweyop_t op, char *b)
{
int ad;
int bd;
char *a_nb;
char *b_nb;
int in_nb = 0;
int cmp;
assert(a != NULL);
assert(b != NULL);
/* Null out 'n' in any "nb" suffixes for initial pass */
if ((a_nb = strstr(a, "nb")))
*a_nb = 0;
if ((b_nb = strstr(b, "nb")))
*b_nb = 0;
for (;;) {
if (*a == 0 && *b == 0) {
if (!in_nb && (a_nb || b_nb)) {
/*
* If exact match on first pass, test
* "nb<X>" suffixes in second pass
*/
in_nb = 1;
if (a_nb)
a = a_nb + 2; /* Skip "nb" suffix */
if (b_nb)
b = b_nb + 2; /* Skip "nb" suffix */
} else {
cmp = 0;
break;
}
}
ad = bd = 0;
for (; *a && *a != '.'; a++) {
ad = (ad * 10) + (*a - '0');
}
for (; *b && *b != '.'; b++) {
bd = (bd * 10) + (*b - '0');
}
if ((cmp = ad - bd) != 0) {
break;
}
if (*a == '.')
++a;
if (*b == '.')
++b;
}
/* Replace any nulled 'n' */
if (a_nb)
*a_nb = 'n';
if (b_nb)
*b_nb = 'n';
return (op == GE) ? cmp >= 0 : (op == GT) ? cmp > 0 :
(op == LE) ? cmp <= 0 : cmp < 0;
}
/*
* Perform alternate match on "pkg" against "pattern",
* calling pmatch (recursively) to resolve any other patterns.
* Return 1 on match, 0 otherwise
*/
static int
alternate_match(const char *pattern, const char *pkg)
{
char *sep;
char buf[FILENAME_MAX];
char *last;
char *alt;
char *cp;
int cnt;
int found;
if ((sep = strchr(pattern, '{')) == (char *) NULL) {
errx(1, "alternate_match(): '{' expected in `%s'", pattern);
}
(void)strncpy(buf, pattern, (size_t) (sep - pattern));
alt = &buf[sep - pattern];
last = (char *) NULL;
for (cnt = 0, cp = sep; *cp && last == (char *) NULL; cp++) {
if (*cp == '{') {
cnt++;
} else if (*cp == '}' && --cnt == 0 && last == (char *) NULL) {
last = cp + 1;
}
}
if (cnt != 0) {
errx(1, "Malformed alternate `%s'", pattern);
}
for (found = 0, cp = sep + 1; *sep != '}'; cp = sep + 1) {
for (cnt = 0, sep = cp; cnt > 0 || (cnt == 0 && *sep != '}' &&
*sep != ','); sep++) {
if (*sep == '{') {
cnt++;
} else if (*sep == '}') {
cnt--;
}
}
(void)snprintf(alt, sizeof(buf) - (alt - buf), "%.*s%s",
(int)(sep - cp), cp, last);
if (pmatch(buf, pkg) == 1) {
found = 1;
}
}
return found;
}
/*
* Perform dewey match on "pkg" against "pattern".
* Return 1 on match, 0 otherwise
*/
static int
dewey_match(const char *pattern, const char *pkg)
{
deweyop_t op;
char *cp;
char *sep;
char *ver;
char name[FILENAME_MAX];
int n;
if ((sep = strpbrk(pattern, "<>")) == NULL) {
errx(1, "dewey_match(): '<' or '>' expected in `%s'", pattern);
}
(void)snprintf(name, sizeof(name), "%.*s", (int)(sep - pattern),
pattern);
op = (*sep == '>') ? (*(sep + 1) == '=') ? GE : GT : (*(sep + 1) == '=')
? LE : LT;
ver = (op == GE || op == LE) ? sep + 2 : sep + 1;
n = (int) (sep - pattern);
if ((cp = strrchr(pkg, '-')) != (char *) NULL) {
if (strncmp(pkg, name, (size_t)(cp - pkg)) == 0 &&
n == cp - pkg) {
if (deweycmp(cp + 1, op, ver)) {
return 1;
}
}
}
return 0;
}
/*
* Perform glob match on "pkg" against "pattern".
* Return 1 on match, 0 otherwise
*/
static int
glob_match(const char *pattern, const char *pkg)
{
return fnmatch(pattern, pkg, FNM_PERIOD) == 0;
}
/*
* Perform simple match on "pkg" against "pattern".
* Return 1 on match, 0 otherwise
*/
static int
simple_match(const char *pattern, const char *pkg)
{
return strcmp(pattern, pkg) == 0;
}
/*
* Match pkg against pattern, return 1 if matching, 0 else
*/
int
pmatch(const char *pattern, const char *pkg)
{
if (strchr(pattern, '{') != (char *) NULL) {
/* emulate csh-type alternates */
return alternate_match(pattern, pkg);
}
if (strpbrk(pattern, "<>") != (char *) NULL) {
/* perform relational dewey match on version number */
return dewey_match(pattern, pkg);
}
if (strpbrk(pattern, "*?[]") != (char *) NULL) {
/* glob match */
return glob_match(pattern, pkg);
}
/* no alternate, dewey or glob match -> simple compare */
return simple_match(pattern, pkg);
}
/* pkg_cmp is used to implement the ~~~ operator in PostgreSQL */
#include <postgres.h>
bool
pkg_cmp(text *pkg, text *pattern)
{
/* Make sure that the strings are \0 terminated */
pkg->vl_dat[pkg->vl_len] = '\0';
pattern->vl_dat[pattern->vl_len] = '\0';
if (pmatch((const char *)&(pattern->vl_dat),
(const char *)&(pkg->vl_dat)) == 1)
return true;
return false;
}
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