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25ed3412 BY |
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 | * Returns 0 in case of success and -1 if there was an error. The | |
13 | * actual range is stored in *begin and *end. The counting starts | |
14 | * at 1! In case of error, the caller should show usage message. | |
15 | */ | |
16 | ||
17 | typedef const char *(*nth_line_fn_t)(void *data, long lno); | |
18 | ||
19 | extern int parse_range_arg(const char *arg, | |
20 | nth_line_fn_t nth_line_cb, | |
21 | void *cb_data, long lines, | |
13b8f68c TR |
22 | long *begin, long *end, |
23 | const char *path); | |
25ed3412 | 24 | |
12da1d1f TR |
25 | /* |
26 | * Scan past a range argument that could be parsed by | |
27 | * 'parse_range_arg', to help the caller determine the start of the | |
28 | * filename in '-L n,m:file' syntax. | |
29 | * | |
30 | * Returns a pointer to the first character after the 'n,m' part, or | |
31 | * NULL in case the argument is obviously malformed. | |
32 | */ | |
33 | ||
34 | extern const char *skip_range_arg(const char *arg); | |
35 | ||
25ed3412 | 36 | #endif /* LINE_RANGE_H */ |