libbb: [x]fopen_for_{read,write} introduced and used.

 (by Valdimir)

function                                             old     new   delta
config_open2                                           -      41     +41
config_read                                          507     542     +35
find_pair                                            169     187     +18
fopen_for_write                                        -      14     +14
fopen_for_read                                         -      14     +14
find_main                                            406     418     +12
xfopen_for_write                                       -      10     +10
xfopen_for_read                                        -      10     +10
popstring                                            134     140      +6
parse_inittab                                        396     401      +5
next_token                                           923     928      +5
pack_gzip                                           1659    1661      +2
bb__parsespent                                       117     119      +2
fallbackSort                                        1719    1717      -2
evalvar                                             1376    1374      -2
qrealloc                                              36      33      -3
...
...
...
...
singlemount                                         4579    4569     -10
process_stdin                                        443     433     -10
patch_main                                          1111    1101     -10
ifupdown_main                                       2175    2165     -10
file_action_grep                                      90      80     -10
uuidcache_init                                       649     637     -12
hush_main                                            797     785     -12
read_config                                          230     217     -13
dpkg_main                                           3835    3820     -15
read_line_input                                     3134    3110     -24
sysctl_main                                          232     203     -29
config_open                                           40      10     -30
WARN_BAD_LINE                                         44       -     -44
login_main                                          1714    1575    -139
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 8/74 up/down: 174/-737)        Total: -563 bytes

9 files changed, 14 insertions, 25 deletions

diff --git a/util-linux/fbset.c b/util-linux/fbset.c
index ab7770d..ac45fe8 100644
--- a/util-linux/fbset.c
+++ b/util-linux/fbset.c
@@ -178,7 +178,7 @@ static int readmode(struct fb_var_screeninfo *base, const char *fn,
 	char buf[256];
 	char *p = buf;
 
-	f = xfopen(fn, "r");
+	f = xfopen_for_read(fn);
 	while (!feof(f)) {
 		fgets(buf, sizeof(buf), f);
 		p = strstr(buf, "mode ");
diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index 702567a..b1f0b65 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -2684,7 +2684,7 @@ is_ide_cdrom_or_tape(const char *device)
 		return 0;
 
 	snprintf(buf, sizeof(buf), "/proc/ide/%s/media", device+5);
-	procf = fopen(buf, "r");
+	procf = fopen_for_read(buf);
 	if (procf != NULL && fgets(buf, sizeof(buf), procf))
 		is_ide = (!strncmp(buf, "cdrom", 5) ||
 			  !strncmp(buf, "tape", 4));
diff --git a/util-linux/fdisk_sun.c b/util-linux/fdisk_sun.c
index 427efbe..d1a436b 100644
--- a/util-linux/fdisk_sun.c
+++ b/util-linux/fdisk_sun.c
@@ -181,7 +181,7 @@ sun_autoconfigure_scsi(void)
 		id[0] & 0xff,
 		(id[0]>>8) & 0xff
 	);
-	pfd = fopen("/proc/scsi/scsi", "r");
+	pfd = fopen_for_read("/proc/scsi/scsi");
 	if (!pfd) {
 		return NULL;
 	}
diff --git a/util-linux/hexdump.c b/util-linux/hexdump.c
index 4d2b059..8ac12f0 100644
--- a/util-linux/hexdump.c
+++ b/util-linux/hexdump.c
@@ -14,24 +14,13 @@
 
 /* This is a NOEXEC applet. Be very careful! */
 
-
 static void bb_dump_addfile(dumper_t *dumper, char *name)
 {
-	char *p;
-	FILE *fp;
-	char *buf;
-
-	fp = xfopen(name, "r");
-
-	while ((buf = xmalloc_fgetline(fp)) != NULL) {
-		p = skip_whitespace(buf);
-
-		if (*p && (*p != '#')) {
-			bb_dump_add(dumper, p);
-		}
-		free(buf);
+	parser_t *parser = config_open2(name, xfopen_for_read);
+	while (config_read(parser, &name, 1, 1, "# \t", 0)) {
+		bb_dump_add(dumper, name);
 	}
-	fclose(fp);
+	config_close(parser);
 }
 
 static const char *const add_strings[] = {
@@ -131,7 +120,7 @@ int hexdump_main(int argc, char **argv)
 
 	do {
 		char *buf;
-		fp = xfopen(*argv, "r");
+		fp = xfopen_for_read(*argv);
  jump_in:
 		while ((buf = xmalloc_fgetline(fp)) != NULL) {
 			p = buf;
diff --git a/util-linux/mkfs_minix.c b/util-linux/mkfs_minix.c
index 8c3991a..b29bf5a 100644
--- a/util-linux/mkfs_minix.c
+++ b/util-linux/mkfs_minix.c
@@ -540,7 +540,7 @@ static void get_list_blocks(char *filename)
 	FILE *listfile;
 	unsigned long blockno;
 
-	listfile = xfopen(filename, "r");
+	listfile = xfopen_for_read(filename);
 	while (!feof(listfile)) {
 		fscanf(listfile, "%ld\n", &blockno);
 		mark_zone(blockno);
diff --git a/util-linux/more.c b/util-linux/more.c
index 9395466..cf8e137 100644
--- a/util-linux/more.c
+++ b/util-linux/more.c
@@ -72,7 +72,7 @@ int more_main(int argc UNUSED_PARAM, char **argv)
 	 * is not a tty and turns into cat. This makes sense. */
 	if (!isatty(STDOUT_FILENO))
 		return bb_cat(argv);
-	cin = fopen(CURRENT_TTY, "r");
+	cin = fopen_for_read(CURRENT_TTY);
 	if (!cin)
 		return bb_cat(argv);
 
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 31f433b..2288e2c 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -363,7 +363,7 @@ static llist_t *get_block_backed_filesystems(void)
 	FILE *f;
 
 	for (i = 0; i < 2; i++) {
-		f = fopen(filesystems[i], "r");
+		f = fopen_for_read(filesystems[i]);
 		if (!f) continue;
 
 		while ((buf = xmalloc_fgetline(f)) != NULL) {
diff --git a/util-linux/readprofile.c b/util-linux/readprofile.c
index 1c15712..1f5ba2e 100644
--- a/util-linux/readprofile.c
+++ b/util-linux/readprofile.c
@@ -144,7 +144,7 @@ int readprofile_main(int argc UNUSED_PARAM, char **argv)
 
 	total = 0;
 
-	map = xfopen(mapFile, "r");
+	map = xfopen_for_read(mapFile);
 
 	while (fgets(mapline, S_LEN, map)) {
 		if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
diff --git a/util-linux/volume_id/get_devname.c b/util-linux/volume_id/get_devname.c
index d1968b7..f9a2c90 100644
--- a/util-linux/volume_id/get_devname.c
+++ b/util-linux/volume_id/get_devname.c
@@ -165,7 +165,7 @@ uuidcache_init_partitions(void)
 	int handleOnFirst;
 	char *chptr;
 
-	procpt = xfopen("/proc/partitions", "r");
+	procpt = xfopen_for_read("/proc/partitions");
 /*
 # cat /proc/partitions
 major minor  #blocks  name
@@ -259,7 +259,7 @@ uuidcache_init_cdroms(void)
 	int ma, mi;
 	FILE *proccd;
 
-	proccd = fopen(PROC_CDROMS, "r");
+	proccd = fopen_for_read(PROC_CDROMS);
 	if (!proccd) {
 //		static smallint warn = 0;
 //		if (!warn) {