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815834e Aug 6, 2013
@trast @sunshineco @byang
40 lines (33 sloc) 1.3 KB
#ifndef LINE_RANGE_H
#define LINE_RANGE_H
/*
* Parse one item in an -L begin,end option w.r.t. the notional file
* object 'cb_data' consisting of 'lines' lines.
*
* The 'nth_line_cb' callback is used to determine the start of the
* line 'lno' inside the 'cb_data'. The caller is expected to already
* have a suitable map at hand to make this a constant-time lookup.
*
* 'anchor' is the 1-based line at which relative range specifications
* should be anchored. Absolute ranges are unaffected by this value.
*
* Returns 0 in case of success and -1 if there was an error. The
* actual range is stored in *begin and *end. The counting starts
* at 1! In case of error, the caller should show usage message.
*/
typedef const char *(*nth_line_fn_t)(void *data, long lno);
extern int parse_range_arg(const char *arg,
nth_line_fn_t nth_line_cb,
void *cb_data, long lines, long anchor,
long *begin, long *end,
const char *path);
/*
* Scan past a range argument that could be parsed by
* 'parse_range_arg', to help the caller determine the start of the
* filename in '-L n,m:file' syntax.
*
* Returns a pointer to the first character after the 'n,m' part, or
* NULL in case the argument is obviously malformed.
*/
extern const char *skip_range_arg(const char *arg);
#endif /* LINE_RANGE_H */
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