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

1 files changed, 7 insertions, 0 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 4b2a839..684e130 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -631,6 +631,10 @@ extern FILE *fopen_or_warn(const char *filename, const char *mode) FAST_FUNC;
 /* "Opens" stdin if filename is special, else just opens file: */
 extern FILE *xfopen_stdin(const char *filename) FAST_FUNC;
 extern FILE *fopen_or_warn_stdin(const char *filename) FAST_FUNC;
+extern FILE* fopen_for_read(const char *path) FAST_FUNC;
+extern FILE* xfopen_for_read(const char *path) FAST_FUNC;
+extern FILE* fopen_for_write(const char *path) FAST_FUNC;
+extern FILE* xfopen_for_write(const char *path) FAST_FUNC;
 
 int bb_pstrcmp(const void *a, const void *b) /* not FAST_FUNC! */;
 void qsort_string_vector(char **sv, unsigned count) FAST_FUNC;
@@ -993,10 +997,12 @@ int bb_parse_mode(const char* s, mode_t* theMode) FAST_FUNC;
  * Config file parser
  */
 enum {
+	PARSE_VANILLA        = 0x00000000, // trim line, collapse delimiters, warn and continue if less than mintokens
 	PARSE_DONT_REDUCE    = 0x00010000, // do not treat consecutive delimiters as one
 	PARSE_DONT_TRIM      = 0x00020000, // do not trim line of leading and trailing delimiters
 	PARSE_LAST_IS_GREEDY = 0x00040000, // last token takes whole remainder of the line
 //	PARSE_DONT_NULL      = 0x00080000, // do not set tokens[] to NULL
+	PARSE_MIN_DIE        = 0x00100000, // die if less tokens found
 	// keep a copy of current line
 	PARSE_KEEP_COPY      = 0x00200000 * ENABLE_DEBUG_CROND_OPTION,
 };
@@ -1007,6 +1013,7 @@ typedef struct parser_t {
 	int lineno;
 } parser_t;
 parser_t* config_open(const char *filename) FAST_FUNC;
+parser_t* config_open2(const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *path)) FAST_FUNC;
 int config_read(parser_t *parser, char **tokens, unsigned flags, const char *delims) FAST_FUNC;
 #define config_read(parser, tokens, max, min, str, flags) \
 	config_read(parser, tokens, ((flags) | (((min) & 0xFF) << 8) | ((max) & 0xFF)), str)