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1 | #ifndef LINE_RANGE_H | |
2 | #define LINE_RANGE_H | |
3 | ||
4 | struct index_state; | |
5 | ||
6 | /* | |
7 | * Parse one item in an -L begin,end option w.r.t. the notional file | |
8 | * object 'cb_data' consisting of 'lines' lines. | |
9 | * | |
10 | * The 'nth_line_cb' callback is used to determine the start of the | |
11 | * line 'lno' inside the 'cb_data'. The caller is expected to already | |
12 | * have a suitable map at hand to make this a constant-time lookup. | |
13 | * | |
14 | * 'anchor' is the 1-based line at which relative range specifications | |
15 | * should be anchored. Absolute ranges are unaffected by this value. | |
16 | * | |
17 | * Returns 0 in case of success and -1 if there was an error. The | |
18 | * actual range is stored in *begin and *end. The counting starts | |
19 | * at 1! In case of error, the caller should show usage message. | |
20 | */ | |
21 | ||
22 | typedef const char *(*nth_line_fn_t)(void *data, long lno); | |
23 | ||
24 | int parse_range_arg(const char *arg, | |
25 | nth_line_fn_t nth_line_cb, | |
26 | void *cb_data, long lines, long anchor, | |
27 | long *begin, long *end, | |
28 | const char *path, struct index_state *istate); | |
29 | ||
30 | /* | |
31 | * Scan past a range argument that could be parsed by | |
32 | * 'parse_range_arg', to help the caller determine the start of the | |
33 | * filename in '-L n,m:file' syntax. | |
34 | * | |
35 | * Returns a pointer to the first character after the 'n,m' part, or | |
36 | * NULL in case the argument is obviously malformed. | |
37 | */ | |
38 | ||
39 | const char *skip_range_arg(const char *arg, struct index_state *istate); | |
40 | ||
41 | #endif /* LINE_RANGE_H */ |