[PATCH v2] unit-tests: do show relative file paths on non-Windows, too

[Junio C Hamano <gitster@pobox.com>]

>
> We know which separator we're expecting so we could replace  the last
> two comparisons with
>
> 		prefix[prefix_len -1] != needle[1]
>
> but as I say I'm not sure that is worth re-rolling for

There is a larger clean-up opportunity to drop the need for making a
copy, which probably is worth doing, so I folded the above into this
version.

------- >8 ------------- >8 ------------- >8 ------------- >8 -------

There are compilers other than Visual C that want to show absolute
paths.  Generalize the helper introduced by a2c5e294 (unit-tests: do
show relative file paths, 2023-09-25) so that it can also work with
a path that uses slash as the directory separator, and becomes
almost no-op once one-time preparation finds out that we are using a
compiler that already gives relative paths.  Incidentally, this also
should do the right thing on Windows with a compiler that shows
relative paths but with backslash as the directory separator (if
such a thing exists and is used to build git).

Reported-by: Randall S. Becker <rsbecker@nexbridge.com>
Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

  * I found that the diff relative to the result of applying v1 was
    easier to follow than the range-diff, so here it is.

  diff --git c/t/unit-tests/test-lib.c w/t/unit-tests/test-lib.c
  index 83c9eb8c59..66d6980ffb 100644
  --- c/t/unit-tests/test-lib.c
  +++ w/t/unit-tests/test-lib.c
  @@ -64,34 +64,33 @@ static const char *make_relative(const char *location)
   		 * prefix_len == 0 if the compiler gives paths relative
   		 * to the root of the working tree.  Otherwise, we want
   		 * to see that we did find the needle[] at a directory
  -		 * boundary.
  +		 * boundary.  Again we rely on that needle[] begins with
  +		 * "t" followed by the directory separator.
   		 */
   		if (fspathcmp(needle, prefix + prefix_len) ||
  -		    (prefix_len &&
  -		     prefix[prefix_len - 1] != '/' &&
  -		     prefix[prefix_len - 1] != '\\'))
  +		    (prefix_len && prefix[prefix_len - 1] != needle[1]))
   			die("unexpected suffix of '%s'", prefix);
  -
   	}
   
   	/*
  -	 * If our compiler gives relative paths and we do not need
  -	 * to munge directory separator, we can return location as-is.
  +	 * Does it not start with the expected prefix?
  +	 * Return it as-is without making it worse.
   	 */
  -	if (!prefix_len && !need_bs_to_fs)
  +	if (prefix_len && fspathncmp(location, prefix, prefix_len))
   		return location;
   
  -	/* Does it not start with the expected prefix? */
  -	if (fspathncmp(location, prefix, prefix_len))
  -		return location;
  +	/*
  +	 * If we do not need to munge directory separator, we can return
  +	 * the substring at the tail of the location.
  +	 */
  +	if (!need_bs_to_fs)
  +		return location + prefix_len;
   
  -	strlcpy(buf, location + prefix_len, sizeof(buf));
   	/* convert backslashes to forward slashes */
  -	if (need_bs_to_fs) {
  -		for (p = buf; *p; p++)
  -			if (*p == '\\')
  -				*p = '/';
  -	}
  +	strlcpy(buf, location + prefix_len, sizeof(buf));
  +	for (p = buf; *p; p++)
  +		if (*p == '\\')
  +			*p = '/';
   	return buf;
   }
   

 t/unit-tests/test-lib.c | 61 +++++++++++++++++++++++++++++++----------
 1 file changed, 47 insertions(+), 14 deletions(-)

diff --git a/t/unit-tests/test-lib.c b/t/unit-tests/test-lib.c
index 7bf9dfdb95..66d6980ffb 100644
--- a/t/unit-tests/test-lib.c
+++ b/t/unit-tests/test-lib.c
@@ -21,12 +21,11 @@ static struct {
 	.result = RESULT_NONE,
 };
 
-#ifndef _MSC_VER
-#define make_relative(location) location
-#else
 /*
  * Visual C interpolates the absolute Windows path for `__FILE__`,
  * but we want to see relative paths, as verified by t0080.
+ * There are other compilers that do the same, and are not for
+ * Windows.
  */
 #include "dir.h"
 
@@ -34,32 +33,66 @@ static const char *make_relative(const char *location)
 {
 	static char prefix[] = __FILE__, buf[PATH_MAX], *p;
 	static size_t prefix_len;
+	static int need_bs_to_fs = -1;
 
-	if (!prefix_len) {
+	/* one-time preparation */
+	if (need_bs_to_fs < 0) {
 		size_t len = strlen(prefix);
-		const char *needle = "\\t\\unit-tests\\test-lib.c";
+		char needle[] = "t\\unit-tests\\test-lib.c";
 		size_t needle_len = strlen(needle);
 
-		if (len < needle_len || strcmp(needle, prefix + len - needle_len))
-			die("unexpected suffix of '%s'", prefix);
+		if (len < needle_len)
+			die("unexpected prefix '%s'", prefix);
+
+		/*
+		 * The path could be relative (t/unit-tests/test-lib.c)
+		 * or full (/home/user/git/t/unit-tests/test-lib.c).
+		 * Check the slash between "t" and "unit-tests".
+		 */
+		prefix_len = len - needle_len;
+		if (prefix[prefix_len + 1] == '/') {
+			/* Oh, we're not Windows */
+			for (size_t i = 0; i < needle_len; i++)
+				if (needle[i] == '\\')
+					needle[i] = '/';
+			need_bs_to_fs = 0;
+		} else {
+			need_bs_to_fs = 1;
+		}
 
-		/* let it end in a directory separator */
-		prefix_len = len - needle_len + 1;
+		/*
+		 * prefix_len == 0 if the compiler gives paths relative
+		 * to the root of the working tree.  Otherwise, we want
+		 * to see that we did find the needle[] at a directory
+		 * boundary.  Again we rely on that needle[] begins with
+		 * "t" followed by the directory separator.
+		 */
+		if (fspathcmp(needle, prefix + prefix_len) ||
+		    (prefix_len && prefix[prefix_len - 1] != needle[1]))
+			die("unexpected suffix of '%s'", prefix);
 	}
 
-	/* Does it not start with the expected prefix? */
-	if (fspathncmp(location, prefix, prefix_len))
+	/*
+	 * Does it not start with the expected prefix?
+	 * Return it as-is without making it worse.
+	 */
+	if (prefix_len && fspathncmp(location, prefix, prefix_len))
 		return location;
 
-	strlcpy(buf, location + prefix_len, sizeof(buf));
+	/*
+	 * If we do not need to munge directory separator, we can return
+	 * the substring at the tail of the location.
+	 */
+	if (!need_bs_to_fs)
+		return location + prefix_len;
+
 	/* convert backslashes to forward slashes */
+	strlcpy(buf, location + prefix_len, sizeof(buf));
 	for (p = buf; *p; p++)
 		if (*p == '\\')
 			*p = '/';
-
 	return buf;
 }
-#endif
 
 static void msg_with_prefix(const char *prefix, const char *format, va_list ap)
 {
-- 
2.44.0-rc0