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less: more sane way of line numbering. Prepares for
wrap/unwrap and line numbers to be toggleable.
This commit is contained in:
parent
2dfd295726
commit
8f39b72aba
@ -166,6 +166,14 @@ struct globals {
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USE_FEATURE_LESS_REGEXP(wanted_match = -1;) \
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} while (0)
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/* flines[] are lines read from stdin, each in malloc'ed buffer.
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* Line numbers are stored as uint32_t prepended to each line.
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* Pointer is adjusted so that flines[i] points directly past
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* line number. Accesor: */
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#define MEMPTR(p) ((char*)(p) - 4)
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#define LINENO(p) (*(uint32_t*)((p) - 4))
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/* Reset terminal input to normal */
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static void set_tty_cooked(void)
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{
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@ -252,15 +260,13 @@ static void read_lines(void)
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USE_FEATURE_LESS_REGEXP(again0:)
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p = current_line = xmalloc(w);
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p = current_line = ((char*)xmalloc(w + 4)) + 4;
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max_fline += last_terminated;
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if (!last_terminated) {
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const char *cp = flines[max_fline];
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if (option_mask32 & FLAG_N)
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cp += 8;
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strcpy(current_line, cp);
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strcpy(p, cp);
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p += strlen(current_line);
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free((char*)flines[max_fline]);
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free(MEMPTR(flines[max_fline]));
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/* linepos is still valid from previous read_lines() */
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} else {
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linepos = 0;
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@ -324,17 +330,12 @@ static void read_lines(void)
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reached_eof:
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last_terminated = terminated;
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flines = xrealloc_vector(flines, 8, max_fline);
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if (option_mask32 & FLAG_N) {
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/* Width of 7 preserves tab spacing in the text */
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flines[max_fline] = xasprintf(
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(max_lineno <= 9999999) ? "%7u %s" : "%07u %s",
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max_lineno % 10000000, current_line);
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free(current_line);
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flines[max_fline] = (char*)xrealloc(MEMPTR(current_line), strlen(current_line) + 1 + 4) + 4;
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LINENO(flines[max_fline]) = max_lineno;
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if (terminated)
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max_lineno++;
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} else {
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flines[max_fline] = xrealloc(current_line, strlen(current_line) + 1);
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}
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if (max_fline >= MAXLINES) {
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eof_error = 0; /* Pretend we saw EOF */
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break;
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@ -380,7 +381,7 @@ static void read_lines(void)
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#endif
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}
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max_fline++;
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current_line = xmalloc(w);
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current_line = ((char*)xmalloc(w + 4)) + 4;
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p = current_line;
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linepos = 0;
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} /* end of "read lines until we reach cur_fline" loop */
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@ -487,6 +488,30 @@ static const char ctrlconv[] ALIGN1 =
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"\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
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"\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
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static void lineno_str(char *nbuf9, const char *line)
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{
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nbuf9[0] = '\0';
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if (option_mask32 & FLAG_N) {
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const char *fmt;
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unsigned n;
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if (line == empty_line_marker) {
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memset(nbuf9, ' ', 8);
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nbuf9[8] = '\0';
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return;
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}
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/* Width of 7 preserves tab spacing in the text */
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fmt = "%7u ";
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n = LINENO(line);
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if (n > 9999999) {
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n %= 10000000;
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fmt = "%07u ";
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}
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sprintf(nbuf9, fmt, n);
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}
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}
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#if ENABLE_FEATURE_LESS_REGEXP
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static void print_found(const char *line)
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{
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@ -496,6 +521,7 @@ static void print_found(const char *line)
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regmatch_t match_structs;
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char buf[width];
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char nbuf9[9];
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const char *str = line;
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char *p = buf;
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size_t n;
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@ -532,7 +558,8 @@ static void print_found(const char *line)
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match_structs.rm_so, str,
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match_structs.rm_eo - match_structs.rm_so,
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str + match_structs.rm_so);
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free(growline); growline = new;
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free(growline);
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growline = new;
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str += match_structs.rm_eo;
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line += match_structs.rm_eo;
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eflags = REG_NOTBOL;
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@ -544,11 +571,12 @@ static void print_found(const char *line)
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match_status = 1;
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}
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lineno_str(nbuf9, line);
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if (!growline) {
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printf(CLEAR_2_EOL"%s\n", str);
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printf(CLEAR_2_EOL"%s%s\n", nbuf9, str);
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return;
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}
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printf(CLEAR_2_EOL"%s%s\n", growline, str);
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printf(CLEAR_2_EOL"%s%s%s\n", nbuf9, growline, str);
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free(growline);
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}
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#else
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@ -558,10 +586,13 @@ void print_found(const char *line);
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static void print_ascii(const char *str)
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{
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char buf[width];
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char nbuf9[9];
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char *p;
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size_t n;
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printf(CLEAR_2_EOL);
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lineno_str(nbuf9, str);
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printf(CLEAR_2_EOL"%s", nbuf9);
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while (*str) {
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n = strcspn(str, controls);
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if (n) {
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@ -670,7 +701,7 @@ static void reinitialize(void)
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if (flines) {
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for (i = 0; i <= max_fline; i++)
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free((void*)(flines[i]));
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free(MEMPTR(flines[i]));
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free(flines);
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flines = NULL;
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}
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