diff options
Diffstat (limited to 'miscutils/less.c')
| -rw-r--r-- | miscutils/less.c | 119 |
1 files changed, 82 insertions, 37 deletions
diff --git a/miscutils/less.c b/miscutils/less.c index 2a1797c7b..5c53cbdbf 100644 --- a/miscutils/less.c +++ b/miscutils/less.c @@ -711,23 +711,6 @@ static void status_print(void) print_hilite(p); } -static void cap_cur_fline(int nlines) -{ - int diff; - if (cur_fline < 0) - cur_fline = 0; - if (cur_fline + max_displayed_line > max_fline + TILDES) { - cur_fline -= nlines; - if (cur_fline < 0) - cur_fline = 0; - diff = max_fline - (cur_fline + max_displayed_line) + TILDES; - /* As the number of lines requested was too large, we just move - * to the end of the file */ - if (diff > 0) - cur_fline += diff; - } -} - static const char controls[] ALIGN1 = /* NUL: never encountered; TAB: not converted */ /**/"\x01\x02\x03\x04\x05\x06\x07\x08" "\x0a\x0b\x0c\x0d\x0e\x0f" @@ -913,37 +896,98 @@ static void buffer_fill_and_print(void) buffer_print(); } +/* move cur_fline to a given line number, reading lines if necessary */ +static void goto_lineno(int target) +{ + if (target <= 0 ) { + cur_fline = 0; + } + else if (target > LINENO(flines[cur_fline])) { + retry: + while (LINENO(flines[cur_fline]) != target && cur_fline < max_fline) + ++cur_fline; + /* target not reached but more input is available */ + if (LINENO(flines[cur_fline]) != target && eof_error > 0) { + read_lines(); + goto retry; + } + } + else { + /* search backwards through already-read lines */ + while (LINENO(flines[cur_fline]) != target && cur_fline > 0) + --cur_fline; + } +} + +static void cap_cur_fline(void) +{ + if ((option_mask32 & FLAG_S)) { + if (cur_fline > max_fline) + cur_fline = max_fline; + if (LINENO(flines[cur_fline]) + max_displayed_line > max_lineno + TILDES) { + goto_lineno(max_lineno - max_displayed_line + TILDES); + read_lines(); + } + } + else { + if (cur_fline + max_displayed_line > max_fline + TILDES) + cur_fline = max_fline - max_displayed_line + TILDES; + if (cur_fline < 0) + cur_fline = 0; + } +} + /* Move the buffer up and down in the file in order to scroll */ static void buffer_down(int nlines) { - cur_fline += nlines; + if ((option_mask32 & FLAG_S)) + goto_lineno(LINENO(flines[cur_fline]) + nlines); + else + cur_fline += nlines; read_lines(); - cap_cur_fline(nlines); + cap_cur_fline(); buffer_fill_and_print(); } static void buffer_up(int nlines) { - cur_fline -= nlines; - if (cur_fline < 0) cur_fline = 0; + if ((option_mask32 & FLAG_S)) { + goto_lineno(LINENO(flines[cur_fline]) - nlines); + } + else { + cur_fline -= nlines; + if (cur_fline < 0) + cur_fline = 0; + } read_lines(); buffer_fill_and_print(); } -static void buffer_line(int linenum) +/* display a given line where the argument can be either an index into + * the flines array or a line number */ +static void buffer_to_line(int linenum, int is_lineno) { - if (linenum < 0) - linenum = 0; - cur_fline = linenum; + if (linenum <= 0) + cur_fline = 0; + else if (is_lineno) + goto_lineno(linenum); + else + cur_fline = linenum; read_lines(); - if (linenum + max_displayed_line > max_fline) - linenum = max_fline - max_displayed_line + TILDES; - if (linenum < 0) - linenum = 0; - cur_fline = linenum; + cap_cur_fline(); buffer_fill_and_print(); } +static void buffer_line(int linenum) +{ + buffer_to_line(linenum, FALSE); +} + +static void buffer_lineno(int lineno) +{ + buffer_to_line(lineno, TRUE); +} + static void open_file_and_read_lines(void) { if (filename) { @@ -1348,15 +1392,16 @@ static void number_process(int first_digit) buffer_up(num); break; case 'g': case '<': case 'G': case '>': - cur_fline = num + max_displayed_line; - read_lines(); - buffer_line(num - 1); + buffer_lineno(num - 1); break; case 'p': case '%': - num = num * (max_fline / 100); /* + max_fline / 2; */ - cur_fline = num + max_displayed_line; - read_lines(); - buffer_line(num); +#if ENABLE_FEATURE_LESS_FLAGS + update_num_lines(); + num = num * (num_lines > 0 ? num_lines : max_lineno) / 100; +#else + num = num * max_lineno / 100; +#endif + buffer_lineno(num); break; #if ENABLE_FEATURE_LESS_REGEXP case 'n': |