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139 lines
2.3 KiB
C
139 lines
2.3 KiB
C
/*
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* ##/%% variable matching code ripped out of ash shell for code sharing
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*
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* Copyright (c) 1989, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
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* was re-ported from NetBSD and debianized.
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*/
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#ifdef STANDALONE
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# include <stdbool.h>
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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 <unistd.h>
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#else
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# include "libbb.h"
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#endif
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#include <fnmatch.h>
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#include "match.h"
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#define pmatch(a, b) !fnmatch((a), (b), 0)
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char *scanleft(char *string, char *pattern, bool match_at_left)
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{
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char c;
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char *loc = string;
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do {
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int match;
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const char *s;
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c = *loc;
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if (match_at_left) {
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*loc = '\0';
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s = string;
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} else
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s = loc;
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match = pmatch(pattern, s);
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*loc = c;
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if (match)
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return loc;
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loc++;
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} while (c);
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return NULL;
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}
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char *scanright(char *string, char *pattern, bool match_at_left)
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{
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char c;
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char *loc = string + strlen(string);
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while (loc >= string) {
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int match;
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const char *s;
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c = *loc;
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if (match_at_left) {
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*loc = '\0';
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s = string;
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} else
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s = loc;
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match = pmatch(pattern, s);
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*loc = c;
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if (match)
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return loc;
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loc--;
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}
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return NULL;
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}
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#ifdef STANDALONE
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int main(int argc, char *argv[])
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{
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char *string;
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char *op;
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char *pattern;
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bool match_at_left;
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char *loc;
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int i;
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if (argc == 1) {
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puts(
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"Usage: match <test> [test...]\n\n"
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"Where a <test> is the form: <string><op><match>\n"
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"This is to test the shell ${var#val} expression type.\n\n"
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"e.g. `match 'abc#a*'` -> bc"
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);
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return 1;
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}
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for (i = 1; i < argc; ++i) {
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size_t off;
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scan_t scan;
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printf("'%s': ", argv[i]);
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string = strdup(argv[i]);
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off = strcspn(string, "#%");
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if (!off) {
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printf("invalid format\n");
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free(string);
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continue;
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}
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op = string + off;
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scan = pick_scan(op[0], op[1], &match_at_left);
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pattern = op + 1;
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if (op[0] == op[1])
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op[1] = '\0', ++pattern;
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op[0] = '\0';
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loc = scan(string, pattern, match_at_left);
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if (match_at_left) {
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printf("'%s'\n", loc);
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} else {
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*loc = '\0';
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printf("'%s'\n", string);
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}
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free(string);
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}
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return 0;
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}
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#endif
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