From c8bae7493d2f2910b57f13ded012e86bdcfb0532 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 16:47:53 +0200
Subject: Adding upstream version 1:2.39.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 t/helper/test-regex.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 t/helper/test-regex.c

(limited to 't/helper/test-regex.c')

diff --git a/t/helper/test-regex.c b/t/helper/test-regex.c
new file mode 100644
index 0000000..bd871a7
--- /dev/null
+++ b/t/helper/test-regex.c
@@ -0,0 +1,117 @@
+#include "test-tool.h"
+#include "gettext.h"
+
+struct reg_flag {
+	const char *name;
+	int flag;
+};
+
+static struct reg_flag reg_flags[] = {
+	{ "EXTENDED",	REG_EXTENDED	},
+	{ "NEWLINE",	REG_NEWLINE	},
+	{ "ICASE",	REG_ICASE	},
+	{ "NOTBOL",	REG_NOTBOL	},
+	{ "NOTEOL",	REG_NOTEOL	},
+#ifdef REG_STARTEND
+	{ "STARTEND",	REG_STARTEND	},
+#endif
+	{ NULL, 0 }
+};
+
+static int test_regex_bug(void)
+{
+	char *pat = "[^={} \t]+";
+	char *str = "={}\nfred";
+	regex_t r;
+	regmatch_t m[1];
+
+	if (regcomp(&r, pat, REG_EXTENDED | REG_NEWLINE))
+		die("failed regcomp() for pattern '%s'", pat);
+	if (regexec(&r, str, 1, m, 0))
+		die("no match of pattern '%s' to string '%s'", pat, str);
+
+	/* http://sourceware.org/bugzilla/show_bug.cgi?id=3957  */
+	if (m[0].rm_so == 3) /* matches '\n' when it should not */
+		die("regex bug confirmed: re-build git with NO_REGEX=1");
+
+	regfree(&r);
+	return 0;
+}
+
+int cmd__regex(int argc, const char **argv)
+{
+	const char *pat;
+	const char *str;
+	int ret, silent = 0, flags = 0;
+	regex_t r;
+	regmatch_t m[1];
+	char errbuf[64];
+
+	argv++;
+	argc--;
+
+	if (!argc)
+		goto usage;
+
+	if (!strcmp(*argv, "--bug")) {
+		if (argc == 1)
+			return test_regex_bug();
+		else
+			goto usage;
+	}
+	if (!strcmp(*argv, "--silent")) {
+		silent = 1;
+		argv++;
+		argc--;
+	}
+	if (!argc)
+		goto usage;
+
+	pat = *argv++;
+	if (argc == 1)
+		str = NULL;
+	else {
+		str = *argv++;
+		while (*argv) {
+			struct reg_flag *rf;
+			for (rf = reg_flags; rf->name; rf++)
+				if (!strcmp(*argv, rf->name)) {
+					flags |= rf->flag;
+					break;
+				}
+			if (!rf->name)
+				die("do not recognize flag %s", *argv);
+			argv++;
+		}
+	}
+	git_setup_gettext();
+
+	ret = regcomp(&r, pat, flags);
+	if (ret) {
+		if (silent)
+			return ret;
+
+		regerror(ret, &r, errbuf, sizeof(errbuf));
+		die("failed regcomp() for pattern '%s' (%s)", pat, errbuf);
+	}
+	if (!str)
+		goto cleanup;
+
+	ret = regexec(&r, str, 1, m, 0);
+	if (ret) {
+		if (silent || ret == REG_NOMATCH)
+			goto cleanup;
+
+		regerror(ret, &r, errbuf, sizeof(errbuf));
+		die("failed regexec() for subject '%s' (%s)", str, errbuf);
+	}
+
+cleanup:
+	regfree(&r);
+	return ret;
+usage:
+	usage("\ttest-tool regex --bug\n"
+	      "\ttest-tool regex [--silent] <pattern>\n"
+	      "\ttest-tool regex [--silent] <pattern> <string> [<options>]");
+	return -1;
+}
-- 
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