Unify macro naming conventions

In particular, macros that decide whether to use a particular API/
dependency should be spelled BFS_USE_*, and should be configurable.

10 files changed, 72 insertions, 70 deletions

diff --git a/Makefile b/Makefile
index d38f581..f7af9cc 100644
--- a/Makefile
+++ b/Makefile
@@ -104,11 +104,11 @@ LOCAL_CFLAGS += -fno-sanitize-recover=all
 endif
 
 ifndef NOLIBS
-WITH_ONIGURUMA := y
+USE_ONIGURUMA := y
 endif
 
-ifdef WITH_ONIGURUMA
-LOCAL_CPPFLAGS += -DBFS_WITH_ONIGURUMA=1
+ifdef USE_ONIGURUMA
+LOCAL_CPPFLAGS += -DBFS_USE_ONIGURUMA=1
 
 ONIG_CONFIG := $(shell command -v onig-config 2>/dev/null)
 ifdef ONIG_CONFIG
@@ -120,28 +120,28 @@ endif
 
 LOCAL_CFLAGS += $(ONIG_CFLAGS)
 LOCAL_LDLIBS += $(ONIG_LDLIBS)
-endif # WITH_ONIGURUMA
+endif # USE_ONIGURUMA
 
 ifeq ($(OS),Linux)
 ifndef NOLIBS
-WITH_ACL := y
-WITH_ATTR := y
-WITH_LIBCAP := y
+USE_ACL := y
+USE_ATTR := y
+USE_LIBCAP := y
 endif
 
-ifdef WITH_ACL
+ifdef USE_ACL
 LOCAL_LDLIBS += -lacl
 else
 LOCAL_CPPFLAGS += -DBFS_USE_SYS_ACL_H=0
 endif
 
-ifdef WITH_ATTR
+ifdef USE_ATTR
 LOCAL_LDLIBS += -lattr
 else
 LOCAL_CPPFLAGS += -DBFS_USE_SYS_XATTR_H=0
 endif
 
-ifdef WITH_LIBCAP
+ifdef USE_LIBCAP
 LOCAL_LDLIBS += -lcap
 else
 LOCAL_CPPFLAGS += -DBFS_USE_SYS_CAPABILITY_H=0
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index 5219160..d0cb1fc 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -56,7 +56,7 @@ Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
 | `CC`                             | The C compiler to use, e.g. `make CC=clang` |
 | `CFLAGS`<br>`EXTRA_CFLAGS`       | Override/add to the default compiler flags  |
 | `LDFLAGS`<br>`EXTRA_LDFLAGS`     | Override/add to the linker flags            |
-| `WITH_ACL`<br>`WITH_ATTR`<br>... | Enable/disable [optional dependencies]      |
+| `USE_ACL`<br>`USE_ATTR`<br>...   | Enable/disable [optional dependencies]      |
 | `TEST_FLAGS`                     | `tests.sh` flags for `make check`           |
 | `BUILDDIR`                       | The build output directory (default: `.`)   |
 | `DESTDIR`                        | The root directory for `make install`       |
@@ -68,14 +68,14 @@ Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
 ### Dependencies
 
 `bfs` depends on some system libraries for some of its features.
-These dependencies are optional, and can be turned off at build time if necessary by setting the appropriate variable to the empty string (e.g. `make WITH_ONIGURUMA=`).
-
-| Dependency  | Platforms  | `make` flag      |
-|-------------|------------|------------------|
-| [acl]       | Linux only | `WITH_ACL`       |
-| [attr]      | Linux only | `WITH_ATTR`      |
-| [libcap]    | Linux only | `WITH_LIBCAP`    |
-| [Oniguruma] | All        | `WITH_ONIGURUMA` |
+These dependencies are optional, and can be turned off at build time if necessary by setting the appropriate variable to the empty string (e.g. `make USE_ONIGURUMA=`).
+
+| Dependency  | Platforms  | `make` flag     |
+|-------------|------------|-----------------|
+| [acl]       | Linux only | `USE_ACL`       |
+| [attr]      | Linux only | `USE_ATTR`      |
+| [libcap]    | Linux only | `USE_LIBCAP`    |
+| [Oniguruma] | All        | `USE_ONIGURUMA` |
 
 [acl]: https://savannah.nongnu.org/projects/acl
 [attr]: https://savannah.nongnu.org/projects/attr
diff --git a/src/config.h b/src/config.h
index 1671a0d..79bd931 100644
--- a/src/config.h
+++ b/src/config.h
@@ -189,8 +189,10 @@
 /**
  * Check if function multiversioning via GNU indirect functions (ifunc) is supported.
  */
-#if !defined(BFS_TARGET_CLONES) && __has_attribute(target_clones) && (__GLIBC__ || __FreeBSD__ || __NetBSD__)
-#  define BFS_TARGET_CLONES true
+#ifndef BFS_USE_TARGET_CLONES
+#  if __has_attribute(target_clones) && (__GLIBC__ || __FreeBSD__ || __NetBSD__)
+#    define BFS_USE_TARGET_CLONES true
+#  endif
 #endif
 
 /**
diff --git a/src/diag.h b/src/diag.h
index 8d02da6..c909da5 100644
--- a/src/diag.h
+++ b/src/diag.h
@@ -18,8 +18,8 @@
 #if __STDC_VERSION__ >= 202311L
 #  define bfs_static_assert static_assert
 #else
-#  define bfs_static_assert(...) BFS_STATIC_ASSERT(__VA_ARGS__, #__VA_ARGS__, )
-#  define BFS_STATIC_ASSERT(expr, msg, ...) _Static_assert(expr, msg)
+#  define bfs_static_assert(...) bfs_static_assert_(__VA_ARGS__, #__VA_ARGS__, )
+#  define bfs_static_assert_(expr, msg, ...) _Static_assert(expr, msg)
 #endif
 
 /**
@@ -62,8 +62,6 @@ noreturn void bfs_abortf(const struct bfs_loc *loc, const char *format, ...);
 #  define bfs_bug bfs_abort
 #endif
 
-
-
 /**
  * Unconditional assert.
  */
diff --git a/src/dir.c b/src/dir.c
index a24b572..685bac5 100644
--- a/src/dir.c
+++ b/src/dir.c
@@ -15,11 +15,11 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-#ifndef BFS_GETDENTS
-#  define BFS_GETDENTS (__linux__ || __FreeBSD__)
+#ifndef BFS_USE_GETDENTS
+#  define BFS_USE_GETDENTS (__linux__ || __FreeBSD__)
 #endif
 
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 #  if __linux__
 #    include <sys/syscall.h>
 #  endif
@@ -43,9 +43,9 @@ static ssize_t bfs_getdents(int fd, void *buf, size_t size) {
 	return ret;
 }
 
-#endif // BFS_GETDENTS
+#endif // BFS_USE_GETDENTS
 
-#if BFS_GETDENTS && __linux__
+#if BFS_USE_GETDENTS && __linux__
 /** Directory entry type for bfs_getdents() */
 typedef struct dirent64 sys_dirent;
 #else
@@ -101,7 +101,7 @@ enum bfs_type bfs_mode_to_type(mode_t mode) {
 }
 
 struct bfs_dir {
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 	alignas(sys_dirent) int fd;
 	unsigned short pos;
 	unsigned short size;
@@ -114,7 +114,7 @@ struct bfs_dir {
 	bool eof;
 };
 
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 #  define DIR_SIZE (64 << 10)
 #  define BUF_SIZE (DIR_SIZE - sizeof(struct bfs_dir))
 #else
@@ -143,7 +143,7 @@ int bfs_opendir(struct bfs_dir *dir, int at_fd, const char *at_path) {
 		return -1;
 	}
 
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 	dir->fd = fd;
 	dir->pos = 0;
 	dir->size = 0;
@@ -163,7 +163,7 @@ int bfs_opendir(struct bfs_dir *dir, int at_fd, const char *at_path) {
 }
 
 int bfs_dirfd(const struct bfs_dir *dir) {
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 	return dir->fd;
 #else
 	return dirfd(dir->dir);
@@ -171,7 +171,7 @@ int bfs_dirfd(const struct bfs_dir *dir) {
 }
 
 int bfs_polldir(struct bfs_dir *dir) {
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 	if (dir->pos < dir->size) {
 		return 1;
 	} else if (dir->eof) {
@@ -203,7 +203,7 @@ int bfs_polldir(struct bfs_dir *dir) {
 	}
 
 	return 1;
-#else // !BFS_GETDENTS
+#else // !BFS_USE_GETDENTS
 	if (dir->de) {
 		return 1;
 	} else if (dir->eof) {
@@ -227,7 +227,7 @@ int bfs_polldir(struct bfs_dir *dir) {
 static int bfs_getdent(struct bfs_dir *dir, const sys_dirent **de) {
 	int ret = bfs_polldir(dir);
 	if (ret > 0) {
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 		char *buf = (char *)(dir + 1);
 		*de = (const sys_dirent *)(buf + dir->pos);
 		dir->pos += (*de)->d_reclen;
@@ -283,7 +283,7 @@ int bfs_readdir(struct bfs_dir *dir, struct bfs_dirent *de) {
 }
 
 int bfs_closedir(struct bfs_dir *dir) {
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 	int ret = xclose(dir->fd);
 #else
 	int ret = closedir(dir->dir);
@@ -297,7 +297,7 @@ int bfs_closedir(struct bfs_dir *dir) {
 }
 
 int bfs_fdclosedir(struct bfs_dir *dir, bool same_fd) {
-#if BFS_GETDENTS
+#if BFS_USE_GETDENTS
 	int ret = dir->fd;
 #elif __FreeBSD__
 	int ret = fdclosedir(dir->dir);
diff --git a/src/mtab.c b/src/mtab.c
index e5c25ba..384fdfc 100644
--- a/src/mtab.c
+++ b/src/mtab.c
@@ -14,22 +14,22 @@
 #include <string.h>
 #include <sys/types.h>
 
-#if BFS_USE_MNTENT_H
-#  define BFS_MNTENT 1
-#elif BSD
-#  define BFS_MNTINFO 1
-#elif __SVR4
-#  define BFS_MNTTAB 1
+#if !defined(BFS_USE_MNTENT) && BFS_USE_MNTENT_H
+#  define BFS_USE_MNTENT true
+#elif !defined(BFS_USE_MNTINFO) && BSD
+#  define BFS_USE_MNTINFO true
+#elif !defined(BFS_USE_MNTTAB) && __SVR4
+#  define BFS_USE_MNTTAB true
 #endif
 
-#if BFS_MNTENT
+#if BFS_USE_MNTENT
 #  include <mntent.h>
 #  include <paths.h>
 #  include <stdio.h>
-#elif BFS_MNTINFO
+#elif BFS_USE_MNTINFO
 #  include <sys/mount.h>
 #  include <sys/ucred.h>
-#elif BFS_MNTTAB
+#elif BFS_USE_MNTTAB
 #  include <stdio.h>
 #  include <sys/mnttab.h>
 #endif
@@ -45,7 +45,7 @@ struct bfs_mtab_entry {
 };
 
 struct bfs_mtab {
-	/** The list of mount points. */
+	/** The array of mount points. */
 	struct bfs_mtab_entry *entries;
 	/** The basenames of every mount point. */
 	struct trie names;
@@ -59,7 +59,7 @@ struct bfs_mtab {
 /**
  * Add an entry to the mount table.
  */
-static int bfs_mtab_add(struct bfs_mtab *mtab, const char *path, const char *type) {
+static inline int bfs_mtab_add(struct bfs_mtab *mtab, const char *path, const char *type) {
 	struct bfs_mtab_entry entry = {
 		.path = strdup(path),
 		.type = strdup(type),
@@ -98,7 +98,7 @@ struct bfs_mtab *bfs_mtab_parse(void) {
 
 	int error = 0;
 
-#if BFS_MNTENT
+#if BFS_USE_MNTENT
 
 	FILE *file = setmntent(_PATH_MOUNTED, "r");
 	if (!file) {
@@ -121,7 +121,7 @@ struct bfs_mtab *bfs_mtab_parse(void) {
 
 	endmntent(file);
 
-#elif BFS_MNTINFO
+#elif BFS_USE_MNTINFO
 
 #if __NetBSD__
 	typedef struct statvfs bfs_statfs;
@@ -143,7 +143,7 @@ struct bfs_mtab *bfs_mtab_parse(void) {
 		}
 	}
 
-#elif BFS_MNTTAB
+#elif BFS_USE_MNTTAB
 
 	FILE *file = xfopen(MNTTAB, O_RDONLY | O_CLOEXEC);
 	if (!file) {
diff --git a/src/parse.c b/src/parse.c
index cf4f696..1321270 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -2296,7 +2296,7 @@ static struct bfs_expr *parse_regextype(struct parser_state *state, int arg1, in
 		state->regex_type = BFS_REGEX_POSIX_BASIC;
 	} else if (strcmp(type, "posix-extended") == 0) {
 		state->regex_type = BFS_REGEX_POSIX_EXTENDED;
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 	} else if (strcmp(type, "emacs") == 0) {
 		state->regex_type = BFS_REGEX_EMACS;
 	} else if (strcmp(type, "grep") == 0) {
@@ -2318,7 +2318,7 @@ list_types:
 	cfprintf(cfile, "  ${bld}posix-basic${rs}:    POSIX basic regular expressions (BRE)\n");
 	cfprintf(cfile, "  ${bld}posix-extended${rs}: POSIX extended regular expressions (ERE)\n");
 	cfprintf(cfile, "  ${bld}ed${rs}:             Like ${grn}ed${rs} (same as ${bld}posix-basic${rs})\n");
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 	cfprintf(cfile, "  ${bld}emacs${rs}:          Like ${grn}emacs${rs}\n");
 	cfprintf(cfile, "  ${bld}grep${rs}:           Like ${grn}grep${rs}\n");
 #endif
diff --git a/src/stat.c b/src/stat.c
index e3e5aaa..7a413cd 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -14,15 +14,17 @@
 #include <sys/stat.h>
 
 #if defined(STATX_BASIC_STATS) && (!__ANDROID__ || __ANDROID_API__ >= 30)
-#  define BFS_LIBC_STATX true
+#  define BFS_HAS_LIBC_STATX true
 #elif __linux__
 #  include <linux/stat.h>
 #  include <sys/syscall.h>
 #  include <unistd.h>
 #endif
 
-#if BFS_LIBC_STATX || defined(SYS_statx)
-#  define BFS_STATX true
+#ifndef BFS_USE_STATX
+#  if BFS_HAS_LIBC_STATX || defined(SYS_statx)
+#    define BFS_USE_STATX true
+#  endif
 #endif
 
 const char *bfs_stat_field_name(enum bfs_stat_field field) {
@@ -128,13 +130,13 @@ static int bfs_stat_impl(int at_fd, const char *at_path, int at_flags, struct bf
 	return ret;
 }
 
-#if BFS_STATX
+#if BFS_USE_STATX
 
 /**
  * Wrapper for the statx() system call, which had no glibc wrapper prior to 2.28.
  */
 static int bfs_statx(int at_fd, const char *at_path, int at_flags, unsigned int mask, struct statx *buf) {
-#if BFS_LIBC_STATX
+#if BFS_HAS_LIBC_STATX
 	int ret = statx(at_fd, at_path, at_flags, mask, buf);
 #else
 	int ret = syscall(SYS_statx, at_fd, at_path, at_flags, mask, buf);
@@ -242,13 +244,13 @@ static int bfs_statx_impl(int at_fd, const char *at_path, int at_flags, struct b
 	return ret;
 }
 
-#endif // BFS_STATX
+#endif // BFS_USE_STATX
 
 /**
  * Calls the stat() implementation with explicit flags.
  */
 static int bfs_stat_explicit(int at_fd, const char *at_path, int at_flags, int x_flags, struct bfs_stat *buf) {
-#if BFS_STATX
+#if BFS_USE_STATX
 	static atomic bool has_statx = true;
 
 	if (load(&has_statx, relaxed)) {
diff --git a/src/trie.c b/src/trie.c
index 992d42b..0206509 100644
--- a/src/trie.c
+++ b/src/trie.c
@@ -94,7 +94,7 @@
 
 bfs_static_assert(CHAR_WIDTH == 8);
 
-#if BFS_TARGET_CLONES && (__i386__ || __x86_64__)
+#if BFS_USE_TARGET_CLONES && (__i386__ || __x86_64__)
 #  define TARGET_CLONES_POPCNT __attribute__((target_clones("popcnt", "default")))
 #else
 #  define TARGET_CLONES_POPCNT
diff --git a/src/xregex.c b/src/xregex.c
index ab5f793..88df082 100644
--- a/src/xregex.c
+++ b/src/xregex.c
@@ -11,7 +11,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 #  include <langinfo.h>
 #  include <oniguruma.h>
 #else
@@ -19,7 +19,7 @@
 #endif
 
 struct bfs_regex {
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 	unsigned char *pattern;
 	OnigRegex impl;
 	int err;
@@ -30,7 +30,7 @@ struct bfs_regex {
 #endif
 };
 
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 
 static int bfs_onig_status;
 static OnigEncoding bfs_onig_enc;
@@ -121,7 +121,7 @@ int bfs_regcomp(struct bfs_regex **preg, const char *pattern, enum bfs_regex_typ
 		return -1;
 	}
 
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 	// onig_error_code_to_str() says
 	//
 	//     don't call this after the pattern argument of onig_new() is freed
@@ -204,7 +204,7 @@ fail:
 int bfs_regexec(struct bfs_regex *regex, const char *str, enum bfs_regexec_flags flags) {
 	size_t len = strlen(str);
 
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 	const unsigned char *ustr = (const unsigned char *)str;
 	const unsigned char *end = ustr + len;
 
@@ -263,7 +263,7 @@ int bfs_regexec(struct bfs_regex *regex, const char *str, enum bfs_regexec_flags
 
 void bfs_regfree(struct bfs_regex *regex) {
 	if (regex) {
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 		onig_free(regex->impl);
 		free(regex->pattern);
 #else
@@ -278,7 +278,7 @@ char *bfs_regerror(const struct bfs_regex *regex) {
 		return strdup(strerror(ENOMEM));
 	}
 
-#if BFS_WITH_ONIGURUMA
+#if BFS_USE_ONIGURUMA
 	unsigned char *str = malloc(ONIG_MAX_ERROR_MESSAGE_LEN);
 	if (str) {
 		onig_error_code_to_str(str, regex->err, &regex->einfo);