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