[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/shell/match.c b/ap/app/busybox/src/shell/match.c
new file mode 100644
index 0000000..fee3cf2
--- /dev/null
+++ b/ap/app/busybox/src/shell/match.c
@@ -0,0 +1,148 @@
+/*
+ * ##/%% variable matching code ripped out of ash shell for code sharing
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ *
+ * Copyright (c) 1989, 1991, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
+ * was re-ported from NetBSD and debianized.
+ */
+#ifdef STANDALONE
+# include <stdbool.h>
+# include <stdio.h>
+# include <stdlib.h>
+# include <string.h>
+# include <unistd.h>
+# define FAST_FUNC /* nothing */
+# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN /* nothing */
+# define POP_SAVED_FUNCTION_VISIBILITY /* nothing */
+#else
+# include "libbb.h"
+#endif
+#include <fnmatch.h>
+#include "match.h"
+
+char* FAST_FUNC scan_and_match(char *string, const char *pattern, unsigned flags)
+{
+ char *loc;
+ char *end;
+ unsigned len = strlen(string);
+ int early_exit;
+
+ /* We can stop the scan early only if the string part
+ * we are matching against is shrinking, and the pattern has
+ * an unquoted "star" at the corresponding end. There are two cases.
+ * Case 1:
+ * "qwerty" does not match against pattern "*zy",
+ * no point in trying to match "werty", "erty" etc:
+ */
+ early_exit = (flags == (SCAN_MOVE_FROM_LEFT + SCAN_MATCH_RIGHT_HALF) && pattern[0] == '*');
+
+ if (flags & SCAN_MOVE_FROM_LEFT) {
+ loc = string;
+ end = string + len + 1;
+ } else {
+ loc = string + len;
+ end = string - 1;
+ if (flags == (SCAN_MOVE_FROM_RIGHT + SCAN_MATCH_LEFT_HALF)) {
+ /* Case 2:
+ * "qwerty" does not match against pattern "qz*",
+ * no point in trying to match "qwert", "qwer" etc:
+ */
+ const char *p = pattern + strlen(pattern);
+ if (--p >= pattern && *p == '*') {
+ early_exit = 1;
+ while (--p >= pattern && *p == '\\')
+ early_exit ^= 1;
+ }
+ }
+ }
+
+ while (loc != end) {
+ char c;
+ int r;
+
+ c = *loc;
+ if (flags & SCAN_MATCH_LEFT_HALF) {
+ *loc = '\0';
+ r = fnmatch(pattern, string, 0);
+ *loc = c;
+ } else {
+ r = fnmatch(pattern, loc, 0);
+ }
+ if (r == 0) /* match found */
+ return loc;
+ if (early_exit) {
+#ifdef STANDALONE
+ printf("(early exit) ");
+#endif
+ break;
+ }
+
+ if (flags & SCAN_MOVE_FROM_LEFT) {
+ loc++;
+ } else {
+ loc--;
+ }
+ }
+ return NULL;
+}
+
+#ifdef STANDALONE
+int main(int argc, char *argv[])
+{
+ char *string;
+ char *op;
+ char *pattern;
+ char *loc;
+
+ setvbuf(stdout, NULL, _IONBF, 0);
+
+ if (!argv[1]) {
+ puts(
+ "Usage: match <test> [test...]\n\n"
+ "Where a <test> is the form: <string><op><match>\n"
+ "This is to test the shell ${var#val} expression type.\n\n"
+ "e.g. `match 'abc#a*'` -> bc"
+ );
+ return 1;
+ }
+
+ while (*++argv) {
+ size_t off;
+ unsigned scan_flags;
+
+ string = *argv;
+ off = strcspn(string, "#%");
+ if (!off) {
+ printf("invalid format\n");
+ continue;
+ }
+ op = string + off;
+ scan_flags = pick_scan(op[0], op[1]);
+
+ printf("'%s': flags:%x, ", string, scan_flags);
+ pattern = op + 1;
+ if (op[0] == op[1])
+ pattern++;
+ op[0] = '\0';
+
+ loc = scan_and_match(string, pattern, scan_flags);
+
+ if (scan_flags & SCAN_MATCH_LEFT_HALF) {
+ printf("'%s'\n", loc);
+ } else {
+ if (loc)
+ *loc = '\0';
+ printf("'%s'\n", string);
+ }
+ }
+
+ return 0;
+}
+#endif