global: convert all users of POSIX regex to use our new regexp API

The old POSIX regex API has been superseded by our new regexp API.
Convert all users to make use of the new one.

5 files changed, 66 insertions, 81 deletions

diff --git a/src/config.c b/src/config.c
index d0e439b55..8338da010 100644
--- a/src/config.c
+++ b/src/config.c
@@ -7,13 +7,15 @@
 
 #include "config.h"
 
-#include "sysdir.h"
 #include "git2/config.h"
 #include "git2/sys/config.h"
-#include "vector.h"
+
 #include "buf_text.h"
 #include "config_backend.h"
+#include "regexp.h"
+#include "sysdir.h"
 #include "transaction.h"
+#include "vector.h"
 #if GIT_WIN32
 # include <windows.h>
 #endif
@@ -345,7 +347,7 @@ typedef struct {
 	git_config_iterator parent;
 	git_config_iterator *current;
 	const git_config *cfg;
-	p_regex_t regex;
+	git_regexp regex;
 	size_t i;
 } all_iter;
 
@@ -423,7 +425,7 @@ static int all_iter_glob_next(git_config_entry **entry, git_config_iterator *_it
 	 */
 	while ((error = all_iter_next(entry, _iter)) == 0) {
 		/* skip non-matching keys if regexp was provided */
-		if (p_regexec(&iter->regex, (*entry)->name, 0, NULL, 0) != 0)
+		if (git_regexp_match(&iter->regex, (*entry)->name) != 0)
 			continue;
 
 		/* and simply return if we like the entry's name */
@@ -447,7 +449,7 @@ static void all_iter_glob_free(git_config_iterator *_iter)
 {
 	all_iter *iter = (all_iter *) _iter;
 
-	p_regfree(&iter->regex);
+	git_regexp_dispose(&iter->regex);
 	all_iter_free(_iter);
 }
 
@@ -480,8 +482,7 @@ int git_config_iterator_glob_new(git_config_iterator **out, const git_config *cf
 	iter = git__calloc(1, sizeof(all_iter));
 	GIT_ERROR_CHECK_ALLOC(iter);
 
-	if ((result = p_regcomp(&iter->regex, regexp, P_REG_EXTENDED)) != 0) {
-		git_error_set_regex(&iter->regex, result);
+	if ((result = git_regexp_compile(&iter->regex, regexp, 0)) < 0) {
 		git__free(iter);
 		return -1;
 	}
@@ -510,18 +511,13 @@ int git_config_backend_foreach_match(
 {
 	git_config_entry *entry;
 	git_config_iterator* iter;
-	p_regex_t regex;
+	git_regexp regex;
 	int error = 0;
 
 	assert(backend && cb);
 
-	if (regexp != NULL) {
-		if ((error = p_regcomp(&regex, regexp, P_REG_EXTENDED)) != 0) {
-			git_error_set_regex(&regex, error);
-			p_regfree(&regex);
-			return -1;
-		}
-	}
+	if (regexp && git_regexp_compile(&regex, regexp, 0) < 0)
+		return -1;
 
 	if ((error = backend->iterator(&iter, backend)) < 0) {
 		iter = NULL;
@@ -530,7 +526,7 @@ int git_config_backend_foreach_match(
 
 	while (!(iter->next(&entry, iter) < 0)) {
 		/* skip non-matching keys if regexp was provided */
-		if (regexp && p_regexec(&regex, entry->name, 0, NULL, 0) != 0)
+		if (regexp && git_regexp_match(&regex, entry->name) != 0)
 			continue;
 
 		/* abort iterator on non-zero return value */
@@ -541,7 +537,7 @@ int git_config_backend_foreach_match(
 	}
 
 	if (regexp != NULL)
-		p_regfree(&regex);
+		git_regexp_dispose(&regex);
 
 	iter->free(iter);
 
@@ -981,7 +977,7 @@ typedef struct {
 	git_config_iterator parent;
 	git_config_iterator *iter;
 	char *name;
-	p_regex_t regex;
+	git_regexp regex;
 	int have_regex;
 } multivar_iter;
 
@@ -997,7 +993,7 @@ static int multivar_iter_next(git_config_entry **entry, git_config_iterator *_it
 		if (!iter->have_regex)
 			return 0;
 
-		if (p_regexec(&iter->regex, (*entry)->value, 0, NULL, 0) == 0)
+		if (git_regexp_match(&iter->regex, (*entry)->value) == 0)
 			return 0;
 	}
 
@@ -1012,7 +1008,7 @@ void multivar_iter_free(git_config_iterator *_iter)
 
 	git__free(iter->name);
 	if (iter->have_regex)
-		p_regfree(&iter->regex);
+		git_regexp_dispose(&iter->regex);
 	git__free(iter);
 }
 
@@ -1032,13 +1028,8 @@ int git_config_multivar_iterator_new(git_config_iterator **out, const git_config
 		goto on_error;
 
 	if (regexp != NULL) {
-		error = p_regcomp(&iter->regex, regexp, P_REG_EXTENDED);
-		if (error != 0) {
-			git_error_set_regex(&iter->regex, error);
-			error = -1;
-			p_regfree(&iter->regex);
+		if ((error = git_regexp_compile(&iter->regex, regexp, 0)) < 0)
 			goto on_error;
-		}
 
 		iter->have_regex = 1;
 	}
diff --git a/src/config_file.c b/src/config_file.c
index 849096d0f..bf770c95b 100644
--- a/src/config_file.c
+++ b/src/config_file.c
@@ -18,6 +18,7 @@
 #include "config_entries.h"
 #include "config_parse.h"
 #include "filebuf.h"
+#include "regexp.h"
 #include "strmap.h"
 #include "sysdir.h"
 #include "wildmatch.h"
@@ -61,7 +62,7 @@ typedef struct {
 
 static int config_read(git_config_entries *entries, const git_repository *repo, config_file *file, git_config_level_t level, int depth);
 static int config_read_buffer(git_config_entries *entries, const git_repository *repo, config_file *file, git_config_level_t level, int depth, const char *buf, size_t buflen);
-static int config_write(config_file_backend *cfg, const char *orig_key, const char *key, const p_regex_t *preg, const char *value);
+static int config_write(config_file_backend *cfg, const char *orig_key, const char *key, const git_regexp *preg, const char *value);
 static char *escape_value(const char *ptr);
 
 /**
@@ -350,21 +351,17 @@ static int config_set_multivar(
 	git_config_backend *cfg, const char *name, const char *regexp, const char *value)
 {
 	config_file_backend *b = GIT_CONTAINER_OF(cfg, config_file_backend, parent);
-	char *key;
-	p_regex_t preg;
+	git_regexp preg;
 	int result;
+	char *key;
 
 	assert(regexp);
 
 	if ((result = git_config__normalize_name(name, &key)) < 0)
 		return result;
 
-	result = p_regcomp(&preg, regexp, P_REG_EXTENDED);
-	if (result != 0) {
-		git_error_set_regex(&preg, result);
-		result = -1;
+	if ((result = git_regexp_compile(&preg, regexp, 0)) < 0)
 		goto out;
-	}
 
 	/* If we do have it, set call config_write() and reload */
 	if ((result = config_write(b, name, key, &preg, value)) < 0)
@@ -372,7 +369,7 @@ static int config_set_multivar(
 
 out:
 	git__free(key);
-	p_regfree(&preg);
+	git_regexp_dispose(&preg);
 
 	return result;
 }
@@ -412,7 +409,7 @@ static int config_delete_multivar(git_config_backend *cfg, const char *name, con
 	config_file_backend *b = GIT_CONTAINER_OF(cfg, config_file_backend, parent);
 	git_config_entries *entries = NULL;
 	git_config_entry *entry = NULL;
-	p_regex_t preg = { 0 };
+	git_regexp preg = GIT_REGEX_INIT;
 	char *key = NULL;
 	int result;
 
@@ -430,11 +427,8 @@ static int config_delete_multivar(git_config_backend *cfg, const char *name, con
 		goto out;
 	}
 
-	if ((result = p_regcomp(&preg, regexp, P_REG_EXTENDED)) != 0) {
-		git_error_set_regex(&preg, result);
-		result = -1;
+	if ((result = git_regexp_compile(&preg, regexp, 0)) < 0)
 		goto out;
-	}
 
 	if ((result = config_write(b, name, key, &preg, NULL)) < 0)
 		goto out;
@@ -442,7 +436,7 @@ static int config_delete_multivar(git_config_backend *cfg, const char *name, con
 out:
 	git_config_entries_free(entries);
 	git__free(key);
-	p_regfree(&preg);
+	git_regexp_dispose(&preg);
 	return result;
 }
 
@@ -928,7 +922,7 @@ struct write_data {
 	const char *section;
 	const char *orig_name;
 	const char *name;
-	const p_regex_t *preg;
+	const git_regexp *preg;
 	const char *value;
 };
 
@@ -1033,7 +1027,7 @@ static int write_on_variable(
 
 	/* If we have a regex to match the value, see if it matches */
 	if (has_matched && write_data->preg != NULL)
-		has_matched = (p_regexec(write_data->preg, var_value, 0, NULL, 0) == 0);
+		has_matched = (git_regexp_match(write_data->preg, var_value) == 0);
 
 	/* If this isn't the name/value we're looking for, simply dump the
 	 * existing data back out and continue on.
@@ -1094,7 +1088,8 @@ static int write_on_eof(
 /*
  * This is pretty much the parsing, except we write out anything we don't have
  */
-static int config_write(config_file_backend *cfg, const char *orig_key, const char *key, const p_regex_t *preg, const char* value)
+static int config_write(config_file_backend *cfg, const char *orig_key, const char *key, const git_regexp *preg, const char* value)
+
 {
 	char *orig_section = NULL, *section = NULL, *orig_name, *name, *ldot;
 	git_buf buf = GIT_BUF_INIT, contents = GIT_BUF_INIT;
diff --git a/src/diff_driver.c b/src/diff_driver.c
index 6919e4e61..831d3262d 100644
--- a/src/diff_driver.c
+++ b/src/diff_driver.c
@@ -15,6 +15,7 @@
 #include "map.h"
 #include "buf_text.h"
 #include "config.h"
+#include "regexp.h"
 #include "repository.h"
 
 typedef enum {
@@ -25,7 +26,7 @@ typedef enum {
 } git_diff_driver_t;
 
 typedef struct {
-	p_regex_t re;
+	git_regexp re;
 	int flags;
 } git_diff_driver_pattern;
 
@@ -39,7 +40,7 @@ struct git_diff_driver {
 	uint32_t binary_flags;
 	uint32_t other_flags;
 	git_array_t(git_diff_driver_pattern) fn_patterns;
-	p_regex_t  word_pattern;
+	git_regexp  word_pattern;
 	char name[GIT_FLEX_ARRAY];
 };
 
@@ -113,7 +114,7 @@ static int diff_driver_add_patterns(
 		if (error < 0)
 			break;
 
-		if ((error = p_regcomp(&pat->re, buf.ptr, regex_flags)) != 0) {
+		if ((error = git_regexp_compile(&pat->re, buf.ptr, regex_flags)) != 0) {
 			/*
 			 * TODO: issue a warning
 			 */
@@ -130,7 +131,7 @@ static int diff_driver_add_patterns(
 
 static int diff_driver_xfuncname(const git_config_entry *entry, void *payload)
 {
-	return diff_driver_add_patterns(payload, entry->value, P_REG_EXTENDED);
+	return diff_driver_add_patterns(payload, entry->value, 0);
 }
 
 static int diff_driver_funcname(const git_config_entry *entry, void *payload)
@@ -205,16 +206,12 @@ static int git_diff_driver_builtin(
 
 	if (ddef->fns &&
 		(error = diff_driver_add_patterns(
-			drv, ddef->fns, ddef->flags | P_REG_EXTENDED)) < 0)
+			drv, ddef->fns, ddef->flags)) < 0)
 		goto done;
 
 	if (ddef->words &&
-		(error = p_regcomp(
-			&drv->word_pattern, ddef->words, ddef->flags | P_REG_EXTENDED)))
-	{
-		error = git_error_set_regex(&drv->word_pattern, error);
+	    (error = git_regexp_compile(&drv->word_pattern, ddef->words, ddef->flags)) < 0)
 		goto done;
-	}
 
 	if ((error = git_strmap_set(reg->drivers, drv->name, drv)) < 0)
 		goto done;
@@ -316,11 +313,10 @@ static int git_diff_driver_load(
 		goto done;
 	if (!ce || !ce->value)
 		/* no diff.<driver>.wordregex, so just continue */;
-	else if (!(error = p_regcomp(&drv->word_pattern, ce->value, P_REG_EXTENDED)))
+	else if (!(error = git_regexp_compile(&drv->word_pattern, ce->value, 0)))
 		found_driver = true;
 	else {
 		/* TODO: warn about bad regex instead of failure */
-		error = git_error_set_regex(&drv->word_pattern, error);
 		goto done;
 	}
 
@@ -400,10 +396,10 @@ void git_diff_driver_free(git_diff_driver *driver)
 		return;
 
 	for (i = 0; i < git_array_size(driver->fn_patterns); ++i)
-		p_regfree(& git_array_get(driver->fn_patterns, i)->re);
+		git_regexp_dispose(& git_array_get(driver->fn_patterns, i)->re);
 	git_array_clear(driver->fn_patterns);
 
-	p_regfree(&driver->word_pattern);
+	git_regexp_dispose(&driver->word_pattern);
 
 	git__free(driver);
 }
@@ -451,19 +447,19 @@ static int diff_context_line__pattern_match(
 	git_diff_driver *driver, git_buf *line)
 {
 	size_t i, maxi = git_array_size(driver->fn_patterns);
-	p_regmatch_t pmatch[2];
+	git_regmatch pmatch[2];
 
 	for (i = 0; i < maxi; ++i) {
 		git_diff_driver_pattern *pat = git_array_get(driver->fn_patterns, i);
 
-		if (!p_regexec(&pat->re, line->ptr, 2, pmatch, 0)) {
+		if (!git_regexp_search(&pat->re, line->ptr, 2, pmatch)) {
 			if (pat->flags & REG_NEGATE)
 				return false;
 
 			/* use pmatch data to trim line data */
-			i = (pmatch[1].rm_so >= 0) ? 1 : 0;
-			git_buf_consume(line, git_buf_cstr(line) + pmatch[i].rm_so);
-			git_buf_truncate(line, pmatch[i].rm_eo - pmatch[i].rm_so);
+			i = (pmatch[1].start >= 0) ? 1 : 0;
+			git_buf_consume(line, git_buf_cstr(line) + pmatch[i].start);
+			git_buf_truncate(line, pmatch[i].end - pmatch[i].start);
 			git_buf_rtrim(line);
 
 			return true;
diff --git a/src/revparse.c b/src/revparse.c
index 4bde0d7f2..2618b38ee 100644
--- a/src/revparse.c
+++ b/src/revparse.c
@@ -12,6 +12,7 @@
 #include "buffer.h"
 #include "tree.h"
 #include "refdb.h"
+#include "regexp.h"
 
 #include "git2.h"
 
@@ -42,7 +43,7 @@ static int maybe_abbrev(git_object** out, git_repository *repo, const char *spec
 	return maybe_sha_or_abbrev(out, repo, spec, speclen);
 }
 
-static int build_regex(p_regex_t *regex, const char *pattern)
+static int build_regex(git_regexp *regex, const char *pattern)
 {
 	int error;
 
@@ -51,13 +52,11 @@ static int build_regex(p_regex_t *regex, const char *pattern)
 		return GIT_EINVALIDSPEC;
 	}
 
-	error = p_regcomp(regex, pattern, P_REG_EXTENDED);
+	error = git_regexp_compile(regex, pattern, 0);
 	if (!error)
 		return 0;
 
-	error = git_error_set_regex(regex, error);
-
-	p_regfree(regex);
+	git_regexp_dispose(regex);
 
 	return error;
 }
@@ -66,7 +65,7 @@ static int maybe_describe(git_object**out, git_repository *repo, const char *spe
 {
 	const char *substr;
 	int error;
-	p_regex_t regex;
+	git_regexp regex;
 
 	substr = strstr(spec, "-g");
 
@@ -76,8 +75,8 @@ static int maybe_describe(git_object**out, git_repository *repo, const char *spe
 	if (build_regex(&regex, ".+-[0-9]+-g[0-9a-fA-F]+") < 0)
 		return -1;
 
-	error = p_regexec(&regex, spec, 0, NULL, 0);
-	p_regfree(&regex);
+	error = git_regexp_match(&regex, spec);
+	git_regexp_dispose(&regex);
 
 	if (error)
 		return GIT_ENOTFOUND;
@@ -143,12 +142,11 @@ static int retrieve_previously_checked_out_branch_or_revision(git_object **out,
 {
 	git_reference *ref = NULL;
 	git_reflog *reflog = NULL;
-	p_regex_t preg;
+	git_regexp preg;
 	int error = -1;
 	size_t i, numentries, cur;
 	const git_reflog_entry *entry;
 	const char *msg;
-	p_regmatch_t regexmatches[2];
 	git_buf buf = GIT_BUF_INIT;
 
 	cur = position;
@@ -168,12 +166,14 @@ static int retrieve_previously_checked_out_branch_or_revision(git_object **out,
 	numentries  = git_reflog_entrycount(reflog);
 
 	for (i = 0; i < numentries; i++) {
+		git_regmatch regexmatches[2];
+
 		entry = git_reflog_entry_byindex(reflog, i);
 		msg = git_reflog_entry_message(entry);
 		if (!msg)
 			continue;
 
-		if (p_regexec(&preg, msg, 2, regexmatches, 0))
+		if (git_regexp_search(&preg, msg, 2, regexmatches) < 0)
 			continue;
 
 		cur--;
@@ -181,7 +181,8 @@ static int retrieve_previously_checked_out_branch_or_revision(git_object **out,
 		if (cur > 0)
 			continue;
 
-		git_buf_put(&buf, msg+regexmatches[1].rm_so, regexmatches[1].rm_eo - regexmatches[1].rm_so);
+		if ((git_buf_put(&buf, msg+regexmatches[1].start, regexmatches[1].end - regexmatches[1].start)) < 0)
+			goto cleanup;
 
 		if ((error = git_reference_dwim(base_ref, repo, git_buf_cstr(&buf))) == 0)
 			goto cleanup;
@@ -199,7 +200,7 @@ static int retrieve_previously_checked_out_branch_or_revision(git_object **out,
 cleanup:
 	git_reference_free(ref);
 	git_buf_dispose(&buf);
-	p_regfree(&preg);
+	git_regexp_dispose(&preg);
 	git_reflog_free(reflog);
 	return error;
 }
@@ -448,7 +449,7 @@ cleanup:
 	return error;
 }
 
-static int walk_and_search(git_object **out, git_revwalk *walk, p_regex_t *regex)
+static int walk_and_search(git_object **out, git_revwalk *walk, git_regexp *regex)
 {
 	int error;
 	git_oid oid;
@@ -460,7 +461,7 @@ static int walk_and_search(git_object **out, git_revwalk *walk, p_regex_t *regex
 		if ((error < 0) && (error != GIT_ENOTFOUND))
 			return -1;
 
-		if (!p_regexec(regex, git_commit_message((git_commit*)obj), 0, NULL, 0)) {
+		if (!git_regexp_match(regex, git_commit_message((git_commit*)obj))) {
 			*out = obj;
 			return 0;
 		}
@@ -476,7 +477,7 @@ static int walk_and_search(git_object **out, git_revwalk *walk, p_regex_t *regex
 
 static int handle_grep_syntax(git_object **out, git_repository *repo, const git_oid *spec_oid, const char *pattern)
 {
-	p_regex_t preg;
+	git_regexp preg;
 	git_revwalk *walk = NULL;
 	int error;
 
@@ -497,7 +498,7 @@ static int handle_grep_syntax(git_object **out, git_repository *repo, const git_
 	error = walk_and_search(out, walk, &preg);
 
 cleanup:
-	p_regfree(&preg);
+	git_regexp_dispose(&preg);
 	git_revwalk_free(walk);
 
 	return error;
diff --git a/src/userdiff.h b/src/userdiff.h
index 8bde6303f..c9a80d712 100644
--- a/src/userdiff.h
+++ b/src/userdiff.h
@@ -7,6 +7,8 @@
 #ifndef INCLUDE_userdiff_h__
 #define INCLUDE_userdiff_h__
 
+#include "regexp.h"
+
 /*
  * This file isolates the built in diff driver function name patterns.
  * Most of these patterns are taken from Git (with permission from the
@@ -29,7 +31,7 @@ typedef struct {
 #define PATTERNS(NAME, FN_PATS, WORD_PAT) \
 	{ NAME, FN_PATS, WORD_PAT WORD_DEFAULT, 0 }
 #define IPATTERN(NAME, FN_PATS, WORD_PAT) \
-	{ NAME, FN_PATS, WORD_PAT WORD_DEFAULT, P_REG_ICASE }
+	{ NAME, FN_PATS, WORD_PAT WORD_DEFAULT, GIT_REGEXP_ICASE }
 
 /*
  * The table of diff driver patterns