sha1_name.c: correct misnamed "canonical" and "res"

These are hexadecimal and binary representation of the short object
name given to the callchain as its input.  Rename them with _pfx
suffix to make it clear they are prefixes, and call them hex and bin
respectively.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

sha1_name.c

@@ -9,7 +9,7 @@
 
 static int get_sha1_oneline(const char *, unsigned char *, struct commit_list *);
 
-static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
+static int find_short_object_filename(int len, const char *hex_pfx, unsigned char *sha1)
 {
 	struct alternate_object_database *alt;
 	char hex[40];
@@ -34,18 +34,18 @@ static int find_short_object_filename(int len, const char *name, unsigned char *
 	}
 	fakeent->next = alt_odb_list;
 
-	sprintf(hex, "%.2s", name);
+	sprintf(hex, "%.2s", hex_pfx);
 	for (alt = fakeent; alt && found < 2; alt = alt->next) {
 		struct dirent *de;
 		DIR *dir;
-		sprintf(alt->name, "%.2s/", name);
+		sprintf(alt->name, "%.2s/", hex_pfx);
 		dir = opendir(alt->base);
 		if (!dir)
 			continue;
 		while ((de = readdir(dir)) != NULL) {
 			if (strlen(de->d_name) != 38)
 				continue;
-			if (memcmp(de->d_name, name + 2, len - 2))
+			if (memcmp(de->d_name, hex_pfx + 2, len - 2))
 				continue;
 			if (!found) {
 				memcpy(hex + 2, de->d_name, 38);
@@ -79,7 +79,7 @@ static int match_sha(unsigned len, const unsigned char *a, const unsigned char *
 }
 
 static int unique_in_pack(int len,
-			  const unsigned char *match,
+			  const unsigned char *bin_pfx,
 			  struct packed_git *p,
 			  const unsigned char **found_sha1,
 			  int seen_so_far)
@@ -96,7 +96,7 @@ static int unique_in_pack(int len,
 		int cmp;
 
 		current = nth_packed_object_sha1(p, mid);
-		cmp = hashcmp(match, current);
+		cmp = hashcmp(bin_pfx, current);
 		if (!cmp) {
 			first = mid;
 			break;
@@ -110,12 +110,12 @@ static int unique_in_pack(int len,
 
 	/*
 	 * At this point, "first" is the location of the lowest object
-	 * with an object name that could match "match".  See if we have
+	 * with an object name that could match "bin_pfx".  See if we have
 	 * 0, 1 or more objects that actually match(es).
 	 */
 	for (i = first; i < num; i++) {
 		current = nth_packed_object_sha1(p, first);
-		if (!match_sha(len, match, current))
+		if (!match_sha(len, bin_pfx, current))
 			break;
 
 		/* current matches */
@@ -131,15 +131,15 @@ static int unique_in_pack(int len,
 	return seen_so_far;
 }
 
-static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
+static int find_short_packed_object(int len, const unsigned char *bin_pfx, unsigned char *sha1)
 {
 	struct packed_git *p;
 	const unsigned char *found_sha1 = NULL;
 	int found = 0;
 
 	prepare_packed_git();
 	for (p = packed_git; p && found < 2; p = p->next)
-		found = unique_in_pack(len, match, p, &found_sha1, found);
+		found = unique_in_pack(len, bin_pfx, p, &found_sha1, found);
 
 	if (found == 1)
 		hashcpy(sha1, found_sha1);
@@ -149,15 +149,15 @@ static int find_short_packed_object(int len, const unsigned char *match, unsigne
 #define SHORT_NAME_NOT_FOUND (-1)
 #define SHORT_NAME_AMBIGUOUS (-2)
 
-static int find_unique_short_object(int len, char *canonical,
-				    unsigned char *res, unsigned char *sha1)
+static int find_unique_short_object(int len, char *hex_pfx,
+				    unsigned char *bin_pfx, unsigned char *sha1)
 {
 	int has_unpacked, has_packed;
 	unsigned char unpacked_sha1[20], packed_sha1[20];
 
 	prepare_alt_odb();
-	has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
-	has_packed = find_short_packed_object(len, res, packed_sha1);
+	has_unpacked = find_short_object_filename(len, hex_pfx, unpacked_sha1);
+	has_packed = find_short_packed_object(len, bin_pfx, packed_sha1);
 	if (!has_unpacked && !has_packed)
 		return SHORT_NAME_NOT_FOUND;
 	if (1 < has_unpacked || 1 < has_packed)
@@ -177,13 +177,13 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
 			  int quietly)
 {
 	int i, status;
-	char canonical[40];
-	unsigned char res[20];
+	char hex_pfx[40];
+	unsigned char bin_pfx[20];
 
 	if (len < MINIMUM_ABBREV || len > 40)
 		return -1;
-	hashclr(res);
-	memset(canonical, 'x', 40);
+	hashclr(bin_pfx);
+	memset(hex_pfx, 'x', 40);
 	for (i = 0; i < len ;i++) {
 		unsigned char c = name[i];
 		unsigned char val;
@@ -197,15 +197,15 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
 		}
 		else
 			return -1;
-		canonical[i] = c;
+		hex_pfx[i] = c;
 		if (!(i & 1))
 			val <<= 4;
-		res[i >> 1] |= val;
+		bin_pfx[i >> 1] |= val;
 	}
 
-	status = find_unique_short_object(i, canonical, res, sha1);
+	status = find_unique_short_object(i, hex_pfx, bin_pfx, sha1);
 	if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
-		return error("short SHA1 %.*s is ambiguous.", len, canonical);
+		return error("short SHA1 %.*s is ambiguous.", len, hex_pfx);
 	return status;
 }