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-rw-r--r--lib/include/util.h48
1 files changed, 37 insertions, 11 deletions
diff --git a/lib/include/util.h b/lib/include/util.h
index a9d111b..c13b942 100644
--- a/lib/include/util.h
+++ b/lib/include/util.h
@@ -36,13 +36,40 @@ typedef struct {
} enum_map_t;
+typedef struct {
+ int fd; /* input file descriptor */
+ const char *argstr; /* if not NULL, read from this instead */
+
+ const char *filename; /* input file name */
+ size_t lineno; /* current line number */
+
+ size_t i; /* buffer offset */
+ char buffer[256]; /* current line, null-terminated */
+
+ int argc;
+ const char *const *argv;
+
+ bool string; /* inside a string? */
+ bool escape; /* reading an escape sequence? */
+ bool comment; /* inside a comment */
+} rdline_t;
+
+
/*
- Read from fd until end-of-file or a line feed is encountered.
+ Initialize the config line scanner.
- Returns NULL with errno set on failure. Returns NULL with errno
- cleared if end-of-file is reached.
+ The scanner reads from the provided fd. The filename is used for
+ error reporting. An argument count and vector can be set for argument
+ substitution in rdline.
+*/
+void rdline_init(rdline_t *t, int fd, const char *filename,
+ int argc, const char *const *argv);
+
+/*
+ Read from file until end-of-file or a line feed is encountered.
- The line must be deallocated with free().
+ Returns -1 on failure, +1 if end of file was reached,
+ 0 if data was read successfully.
The following transformations are applied:
- Space characters are replaced with regular white space characters.
@@ -53,19 +80,18 @@ typedef struct {
- If a '"' is encounterd, the above rules are disabled, until a
after the matching '"' is read. A '"' can be escaped by preceeding
it with a backslash.
- - If a second, coresponding '"' is not found, processing fails with
- errno set to EILSEQ.
+ - If a second, coresponding '"' is not found, processing fails.
- If a '%' character is encountered, the next character is expected
to be a single digit index into argv. If it is not a digit or
- outside the bounds set by argc, processing fails and sets errno
- to EINVAL. On success, the argv value is inserted and processed
- as described above.
+ outside the bounds set by argc, processing fails. On success,
+ the argv value is inserted and processed as described above.
- A '%' character can be escaped by writing '%%' or, if inside
a double quite string, by writing \%.
- An attempt to use such an indexed argument inside an argument
- expansion, results in failure with errno set to ELOOP.
+ expansion, results in failure.
+ - If the resulting line is empty, processing is restarted.
*/
-char *rdline(int fd, int argc, const char *const *argv);
+int rdline(rdline_t *t);
/*
Remove double quotes ('"') from a string and substitute escape