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 17typedefconst char*(*nth_line_fn_t)(void*data,long lno); 18 19externintparse_range_arg(const char*arg, 20 nth_line_fn_t nth_line_cb, 21void*cb_data,long lines, 22long*begin,long*end); 23 24#endif/* LINE_RANGE_H */