[GSoC] pathspec: fix sign comparison warnings

Commit Message

Arnav Bhate March 12, 2025, 8:20 p.m. UTC

There are multiple places, especially in loops, where a signed and an
unsigned data type are compared. Git uses a mix of signed and unsigned
types to store lengths of arrays. This sometimes leads to using a signed
index for an array whose length is stored in an unsigned variable or
vice versa.

Replace signed data types with unsigned data types and vice versa
wherever necessary. In some cases, introduce a new variable, where both
signed and unsigned data types have been used to store lengths of arrays
in the same function, where previously only one variable was used to
iterate over both types. In cases where this is not possible, add
appropriate cast. Remove #define DISABLE_SIGN_COMPARE_WARNINGS.

Signed-off-by: Arnav Bhate <[e-mail]>
---
 pathspec.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

Patch

diff --git a/pathspec.c b/pathspec.c
index 89663645e1..fd7dfdfd84 100644
--- a/pathspec.c
+++ b/pathspec.c
@@ -1,5 +1,4 @@ 
 #define USE_THE_REPOSITORY_VARIABLE
-#define DISABLE_SIGN_COMPARE_WARNINGS
 
 #include "git-compat-util.h"
 #include "abspath.h"
@@ -36,6 +35,7 @@  void add_pathspec_matches_against_index(const struct pathspec *pathspec,
 					enum ps_skip_worktree_action sw_action)
 {
 	int num_unmatched = 0, i;
+	unsigned int j;
 
 	/*
 	 * Since we are walking the index as if we were walking the directory,
@@ -48,8 +48,8 @@  void add_pathspec_matches_against_index(const struct pathspec *pathspec,
 			num_unmatched++;
 	if (!num_unmatched)
 		return;
-	for (i = 0; i < istate->cache_nr; i++) {
-		const struct cache_entry *ce = istate->cache[i];
+	for (j = 0; j < istate->cache_nr; j++) {
+		const struct cache_entry *ce = istate->cache[j];
 		if (sw_action == PS_IGNORE_SKIP_WORKTREE &&
 		    (ce_skip_worktree(ce) || !path_in_sparse_checkout(ce->name, istate)))
 			continue;
@@ -78,7 +78,7 @@  char *find_pathspecs_matching_skip_worktree(const struct pathspec *pathspec)
 {
 	struct index_state *istate = the_repository->index;
 	char *seen = xcalloc(pathspec->nr, 1);
-	int i;
+	unsigned int i;
 
 	for (i = 0; i < istate->cache_nr; i++) {
 		struct cache_entry *ce = istate->cache[i];
@@ -130,7 +130,7 @@  static void prefix_magic(struct strbuf *sb, int prefixlen,
 	if (element[1] != '(') {
 		/* Process an element in shorthand form (e.g. ":!/<match>") */
 		strbuf_addstr(sb, ":(");
-		for (int i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
+		for (unsigned int i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 			if ((magic & pathspec_magic[i].bit) &&
 			    pathspec_magic[i].mnemonic) {
 				if (sb->buf[sb->len - 1] != '(')
@@ -341,7 +341,7 @@  static const char *parse_long_magic(unsigned *magic, int *prefix_len,
 
 	for (pos = elem + 2; *pos && *pos != ')'; pos = nextat) {
 		size_t len = strcspn_escaped(pos, ",)");
-		int i;
+		unsigned int i;
 
 		if (pos[len] == ',')
 			nextat = pos + len + 1; /* handle ',' */
@@ -354,7 +354,7 @@  static const char *parse_long_magic(unsigned *magic, int *prefix_len,
 		if (starts_with(pos, "prefix:")) {
 			char *endptr;
 			*prefix_len = strtol(pos + 7, &endptr, 10);
-			if (endptr - pos != len)
+			if ((size_t)(endptr - pos) != len)
 				die(_("invalid parameter for pathspec magic 'prefix'"));
 			continue;
 		}
@@ -400,7 +400,7 @@  static const char *parse_short_magic(unsigned *magic, const char *elem)
 
 	for (pos = elem + 1; *pos && *pos != ':'; pos++) {
 		char ch = *pos;
-		int i;
+		unsigned int i;
 
 		/* Special case alias for '!' */
 		if (ch == '^') {
@@ -564,7 +564,7 @@  static int pathspec_item_cmp(const void *a_, const void *b_)
 
 void pathspec_magic_names(unsigned magic, struct strbuf *out)
 {
-	int i;
+	unsigned int i;
 	for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 		const struct pathspec_magic *m = pathspec_magic + i;
 		if (!(magic & m->bit))
@@ -803,8 +803,8 @@  int match_pathspec_attrs(struct index_state *istate,
 int pathspec_needs_expanded_index(struct index_state *istate,
 				  const struct pathspec *pathspec)
 {
-	unsigned int i, pos;
-	int res = 0;
+	unsigned int pos;
+	int i, res = 0;
 	char *skip_worktree_seen = NULL;
 
 	/*
@@ -845,7 +845,7 @@  int pathspec_needs_expanded_index(struct index_state *istate,
 			 * - not-in-cone/bar*: may need expanded index
 			 * - **.c: may need expanded index
 			 */
-			if (strspn(item.original + item.nowildcard_len, "*") == item.len - item.nowildcard_len &&
+			if (strspn(item.original + item.nowildcard_len, "*") == (unsigned int)(item.len - item.nowildcard_len) &&
 			    path_in_cone_mode_sparse_checkout(item.original, istate))
 				continue;
 
@@ -860,7 +860,7 @@  int pathspec_needs_expanded_index(struct index_state *istate,
 				 * directory name and the sparse directory is the first
 				 * component of the pathspec, need to expand the index.
 				 */
-				if (item.nowildcard_len > ce_namelen(ce) &&
+				if ((unsigned int)item.nowildcard_len > ce_namelen(ce) &&
 				    !strncmp(item.original, ce->name, ce_namelen(ce))) {
 					res = 1;
 					break;