diff.h: remove extern from function declaration
[git/git.git] / line-range.h
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CommitLineData
1#ifndef LINE_RANGE_H
2#define LINE_RANGE_H
3
4/*
5 * Parse one item in an -L begin,end option w.r.t. the notional file
6 * object 'cb_data' consisting of 'lines' lines.
7 *
8 * The 'nth_line_cb' callback is used to determine the start of the
9 * line 'lno' inside the 'cb_data'. The caller is expected to already
10 * have a suitable map at hand to make this a constant-time lookup.
11 *
12 * 'anchor' is the 1-based line at which relative range specifications
13 * should be anchored. Absolute ranges are unaffected by this value.
14 *
15 * Returns 0 in case of success and -1 if there was an error. The
16 * actual range is stored in *begin and *end. The counting starts
17 * at 1! In case of error, the caller should show usage message.
18 */
19
20typedef const char *(*nth_line_fn_t)(void *data, long lno);
21
22extern int parse_range_arg(const char *arg,
23 nth_line_fn_t nth_line_cb,
24 void *cb_data, long lines, long anchor,
25 long *begin, long *end,
26 const char *path);
27
28/*
29 * Scan past a range argument that could be parsed by
30 * 'parse_range_arg', to help the caller determine the start of the
31 * filename in '-L n,m:file' syntax.
32 *
33 * Returns a pointer to the first character after the 'n,m' part, or
34 * NULL in case the argument is obviously malformed.
35 */
36
37extern const char *skip_range_arg(const char *arg);
38
39#endif /* LINE_RANGE_H */