libbb: unified config parser (By Vladimir Dronnikov)

mdev: use it

function                                             old     new   delta
config_read                                            -     400    +400
config_open                                            -      43     +43
config_close                                           -       9      +9
qrealloc                                              33      36      +3
compare_keys                                         735     737      +2
xstrtoull_range_sfx                                  296     295      -1
qgravechar                                           109     106      -3
get_address                                          181     178      -3
next_token                                           928     923      -5
sv_main                                             1228    1222      -6
find_main                                            418     406     -12
next_field                                            32       -     -32
make_device                                         1269    1184     -85
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 2/7 up/down: 457/-147)          Total: 310 bytes

1 files changed, 22 insertions, 0 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 2bd614c71..0db1658f4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -987,6 +987,28 @@ int bb_ask_confirmation(void) FAST_FUNC;
 
 extern int bb_parse_mode(const char* s, mode_t* theMode) FAST_FUNC;
 
+/*
+ * Uniform config file parser helpers
+ */
+#define PARSER_STDIO_BASED 1
+#if !PARSER_STDIO_BASED
+typedef struct parser_t {
+        char *data;
+        char *line;
+        int lineno;
+} parser_t;
+extern char* config_open(parser_t *parser, const char *filename) FAST_FUNC;
+#else
+typedef struct parser_t {
+        FILE *fp;
+        char *line;
+        int lineno;
+} parser_t;
+extern FILE* config_open(parser_t *parser, const char *filename) FAST_FUNC;
+#endif
+extern char* config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) FAST_FUNC;
+extern void config_close(parser_t *parser) FAST_FUNC;
+
 /* Concatenate path and filename to new allocated buffer.
  * Add "/" only as needed (no duplicate "//" are produced).
  * If path is NULL, it is assumed to be "/".